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1810.09810

Simon Taylor

Simon A. C. Taylor, Timothy Park and Idris A. Eckley

Multivariate Locally Stationary Wavelet Process Analysis with the mvLSW R Package

stat.CO

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

This paper describes the R package mvLSW. The package contains a suite of tools for the analysis of multivariate locally stationary wavelet (LSW) time series. Key elements include: (i) the simulation of multivariate LSW time series for a given multivariate evolutionary wavelet spectrum (EWS); (ii) estimation of the time-dependent multivariate EWS for a given time series; (iii) estimation of the time-dependent coherence and partial coherence between time series channels; and, (iv) estimation of approximate confidence intervals for multivariate EWS estimates. A demonstration of the package is presented via both a simulated example and a case study with EuStockMarkets from the datasets package. This paper has been accepted by the Journal of Statistical Software. Presented code extracts demonstrating the mvLSW package is performed under version 1.2.1.

[{'version': 'v1', 'created': 'Tue, 23 Oct 2018 12:22:37 GMT'}]

2018-10-24

[array(['Taylor', 'Simon A. C.', ''], dtype=object) array(['Park', 'Timothy', ''], dtype=object) array(['Eckley', 'Idris A.', ''], dtype=object)]

1706.08927

Angelina Pesevski

Angelina Pesevski, Brian C. Franczak, Paul D. McNicholas

Subspace Clustering with the Multivariate-t Distribution

16 pages, 2 figures

stat.ME

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Clustering procedures suitable for the analysis of very high-dimensional data are needed for many modern data sets. In model-based clustering, a method called high-dimensional data clustering (HDDC) uses a family of Gaussian mixture models for clustering. HDDC is based on the idea that high-dimensional data usually exists in lower-dimensional subspaces; as such, an intrinsic dimension for each sub-population of the observed data can be estimated and cluster analysis can be performed in this lower-dimensional subspace. As a result, only a fraction of the total number of parameters need to be estimated and a computationally efficient parameter estimation scheme based on the EM algorithm was developed. This family of models has gained attention due to its superior classification performance compared to other families of mixture models; however, it still suffers from the usual limitations of Gaussian mixture model-based approaches. In this paper, a robust analogue of the HDDC approach is proposed. This approach, which extends the HDDC procedure to include the mulitvariate-t distribution, encompasses 28 models that rectify the aforementioned shortcomings of the HDDC procedure. Our tHDDC procedure is fitted to both simulated and real data sets and is compared to the HDDC procedure using an image reconstruction problem that arose from satellite imagery of Mars' surface.

[{'version': 'v1', 'created': 'Tue, 27 Jun 2017 16:19:03 GMT'}]

2017-06-28

[array(['Pesevski', 'Angelina', ''], dtype=object) array(['Franczak', 'Brian C.', ''], dtype=object) array(['McNicholas', 'Paul D.', ''], dtype=object)]

2010.01398

Maurizio Bonesini M.

M. Bonesini (on behalf of the FAMU Collaboration)

The FAMU experiment at RIKEN RAL for a precise measure of the proton radius

European Physical Society Conference on High Energy Physics - EPS-HEP2019 -10-17 July, 2019 Ghent, Belgium

PoS(EPS-HEP2019) 132

physics.ins-det physics.atom-ph

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

The goal of the FAMU experiment at RIKEN RAL is the measure of the hyperfine splitting of the ground state of the muonic hydrogen, to allow a determination of the proton Zemach radius with a precision better than $5 \times 10^{-3}$ . The comparison of this measurement with the ones done with ordinary hydrogen may help to solve the so-called "proton radius puzzle", triggered by the $6 \sigma$ discrepancy in the proton charge radius value as extracted from muonic Lamb shift and the value based on e-p scattering and ordinary hydrogen spectroscopy.

[{'version': 'v1', 'created': 'Sat, 3 Oct 2020 17:43:14 GMT'}]

2020-10-06

[array(['Bonesini', 'M.', '', 'on behalf of the FAMU Collaboration'], dtype=object) ]

1307.5874

Simona Ciceri

S. Ciceri, L. Mancini, J. Southworth, N. Nikolov, V. Bozza, I. Bruni, S. Calchi Novati, G. D'Ago, and Th. Henning

Simultaneous follow-up of planetary transits: revised physical properties for the planetary systems HAT-P-16 and WASP-21

8 pages, 6 figures, accepted for publication in A&A

10.1051/0004-6361/201321669

astro-ph.EP

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Context. By now more than 300 planets transiting their host star have been found, and much effort is being put into measuring the properties of each system. Light curves of planetary transits often contain deviations from a simple transit shape, and it is generally difficult to differentiate between anomalies of astrophysical nature (e.g. starspots) and correlated noise due to instrumental or atmospheric effects. Our solution is to observe transit events simultaneously with two telescopes located at different observatories. Aims. Using this observational strategy, we look for anomalies in the light curves of two transiting planetary systems and accurately estimate their physical parameters. Methods. We present the first photometric follow-up of the transiting planet HAT-P-16 b, and new photometric observations of WASP-21 b, obtained simultaneously with two medium-class telescopes located in different countries, using the telescope defocussing technique. We modeled these and other published data in order to estimate the physical parameters of the two planetary systems. Results. The simultaneous observations did not highlight particular features in the light curves, which is consistent with the low activity levels of the two stars. For HAT-P-16, we calculated a new ephemeris and found that the planet is 1.3 \sigma colder and smaller (Rb = 1.190 \pm 0.037 RJup) than the initial estimates, suggesting the presence of a massive core. Our physical parameters for this system point towards a younger age than previously thought. The results obtained for WASP-21 reveal lower values for the mass and the density of the planet (by 1.0 \sigma and 1.4 \sigma respectively) with respect to those found in the discovery paper, in agreement with a subsequent study. We found no evidence of any transit timing variations in either system.

[{'version': 'v1', 'created': 'Mon, 22 Jul 2013 20:32:45 GMT'}]

2015-06-16

[array(['Ciceri', 'S.', ''], dtype=object) array(['Mancini', 'L.', ''], dtype=object) array(['Southworth', 'J.', ''], dtype=object) array(['Nikolov', 'N.', ''], dtype=object) array(['Bozza', 'V.', ''], dtype=object) array(['Bruni', 'I.', ''], dtype=object) array(['Novati', 'S. Calchi', ''], dtype=object) array(["D'Ago", 'G.', ''], dtype=object) array(['Henning', 'Th.', ''], dtype=object)]

1012.4405

Dennis Clougherty

Yanting Zhang, Dennis P. Clougherty

Dissipative Effects on Quantum Sticking

10 pages, 0 figs

Phys. Rev. Lett. 108, 173202 (2012)

10.1103/PhysRevLett.108.173202

cond-mat.quant-gas

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Using variational mean-field theory, many-body dissipative effects on the threshold law for quantum sticking and reflection of neutral and charged particles are examined. For the case of an ohmic bosonic bath, we study the effects of the infrared divergence on the probability of sticking and obtain a non-perturbative expression for the sticking rate. We find that for weak dissipative coupling $\alpha$, the low energy threshold laws for quantum sticking are modified by an infrared singularity in the bath. The sticking probability for a neutral particle with incident energy $E\to 0$ behaves asymptotically as ${\it s}\sim E^{(1+\alpha)/2(1-\alpha)}$; for a charged particle, we obtain ${\it s}\sim E^{\alpha/2(1-\alpha)}$. Thus, "quantum mirrors" --surfaces that become perfectly reflective to particles with incident energies asymptotically approaching zero-- can also exist for charged particles.

[{'version': 'v1', 'created': 'Mon, 20 Dec 2010 17:04:10 GMT'}]

2012-04-27

[array(['Zhang', 'Yanting', ''], dtype=object) array(['Clougherty', 'Dennis P.', ''], dtype=object)]

2301.05913

Jose M. M. Senovilla

Jos\'e M M Senovilla

Beyond black holes: Universal properties of 'ultra-massive' spacetimes

22 pages, 1 figure

YITP-23-01

gr-qc hep-th math-ph math.MP

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

It has been long known that in spacetimes with a positive cosmological constant $\Lambda >0$ the area of spatially stable marginally trapped surfaces (MTSs) has a finite upper bound given by $4\pi/\Lambda$. In this paper I show that any such spacetime containing spatially stable MTSs with area approaching indefinitely that bound acquire universal properties generically. Specifically, they all possess {\em generalized} `holographic screens' (i.e. marginally trapped tubes) foliated by MTSs of spherical topology, composed of a dynamical horizon portion and a timelike membrane portion that meet at a distinguished round sphere $\bar S$ with constant Gaussian curvature $\mathcal{K} =\Lambda$ -- and thus of maximal area $4\pi/\Lambda$. All future (past) generalized holographic screens containing $\bar S$ change signature at $\bar S$, and all of them continue towards the past (future) with non-decreasing (non-increasing) area of their MTSs. A future (past) singularity obtains. For the future case, these `ultra-massive spacetimes' (arXiv:2209.14585) may be more powerful than black holes, as they can overcome the repulsive $\Lambda$-force and render the spacetime as a collapsing universe without event horizon enclosing those generalized holographic screens. It is remarkable that these behaviours do not arise if $\Lambda$ is non-positive. The results have radical implications on black hole mergers and on very compact objects accreting mass from their surroundings -- if $\Lambda >0$.

[{'version': 'v1', 'created': 'Sat, 14 Jan 2023 13:02:38 GMT'} {'version': 'v2', 'created': 'Sat, 11 Mar 2023 19:56:31 GMT'}]

2023-03-14

[array(['Senovilla', 'José M M', ''], dtype=object)]

2010.15014

Miloslav Znojil

Miloslav Znojil

Non-Hermitian N-state degeneracies: unitary realizations via antisymmetric anharmonicities

quant-ph hep-th math-ph math.MP

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

The phenomenon of degeneracy of an $N-$plet of bound states is studied in the framework of quantum theory of closed (i.e., unitary) systems. For an underlying Hamiltonian $H=H(\lambda)$ the degeneracy occurs at a Kato's exceptional point $\lambda^{(EPN)}$ of order $N$ and of the spectral geometric multiplicity $K<N$. In spite of the phenomenological appeal of the concept (tractable as a quantum phase transition, or as a unitary processes of the loss of the observability of the system), the dedicated literature deals, predominantly, just with the models where $N=2$ and $K=1$. In our paper it is shown that the construction of the $N>2$ and $K>1$ benchmark models of the process of degeneracy becomes feasible and non-numerical for a broad class of specific, maximally non-Hermitian anharmonic-oscillator toy-model Hamiltonians. An exhaustive classification of non-equivalent processes is given by a partitioning of the unperturbed spectrum into equidistant and centered unperturbed subspectra.

[{'version': 'v1', 'created': 'Wed, 28 Oct 2020 14:41:52 GMT'}]

2020-10-29

[array(['Znojil', 'Miloslav', ''], dtype=object)]

1910.03129

Jennifer Hsiao

Jennifer Hsiao, Abigail L.S. Swann, Soo-Hyung Kim

Maize yield under a changing climate: The hidden role of vapor pressure deficit

Agric. For. Meteorol. 279, 107692 (2019)

10.1016/j.agrformet.2019.107692

q-bio.OT

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Temperatures over the next century are expected to rise to levels detrimental to crop growth and yield. As the atmosphere warms without additional water vapor input, vapor pressure deficit (VPD) increases as well. Increased temperatures and accompanied elevated VPD levels can both lead to negative impacts on crop yield. The independent importance of VPD, however, is often neglected or conflated with that from temperature due to a tight correlation between the two climate factors. We used a coupled process-based crop (MAIZSIM) and soil (2DSOIL) model to gain a mechanistic understanding of the independent roles temperature and VPD play in crop yield projections, as well as their interactions with rising CO2 levels and changing precipitation patterns. We found that by separating out the VPD effect from rising temperatures, VPD increases had a greater negative impact on yield compared to that from warming. The negative impact of these two factors varied with precipitation levels and influenced yield through separate mechanisms. Warmer temperatures caused yield loss mainly through shortening the growing season, while elevated VPD increased water loss and triggered several water stress responses such as reduced photosynthetic rates, lowered leaf area development, and shortened growing season length. Elevated CO2 concentrations partially alleviated yield loss under warming or increased VPD conditions through water savings, but the impact level varied with precipitation levels and was most pronounced under drier conditions. These results demonstrate the key role VPD plays in crop growth and yield, displaying a magnitude of impact comparative to temperature and CO2. A mechanistic understanding of the function of VPD and its relation with other climate factors and management practices is critical to improving crop yield projections under a changing climate.

[{'version': 'v1', 'created': 'Mon, 7 Oct 2019 23:24:14 GMT'}]

2019-10-09

[array(['Hsiao', 'Jennifer', ''], dtype=object) array(['Swann', 'Abigail L. S.', ''], dtype=object) array(['Kim', 'Soo-Hyung', ''], dtype=object)]

2104.04090

Paddy Royall

C. Patrick Royall, Malcolm A. Faers, Sian L. Fussell and James E. Hallett

Real Space Analysis of Colloidal Gels: Triumphs, Challenges and Future Directions

55 pages, submitted to J. Phys.: Condens. Matter

10.1088/1361-648X/ac04cb

cond-mat.soft cond-mat.stat-mech

http://creativecommons.org/licenses/by/4.0/

Colloidal gels constitute an important class of materials found in many contexts and with a wide range of applications. Yet as matter far from equilibrium, gels exhibit a variety of time-dependent behaviours, which can be perplexing, such as an increase in strength prior to catastrophic failure. Remarkably, such complex phenomena are faithfully captured by an extremely simple model - "sticky spheres". Here we review progress in our understanding of colloidal gels made through the use of real space analysis and particle resolved studies. We consider the challenges of obtaining a suitable experimental system where the refractive index and density of the colloidal particles is matched to that of the solvent. We review work to obtain a particle-level mechanism for rigidity in gels and the evolution of our understanding of time-dependent behaviour, from early-time aggregation to ageing, before considering the response of colloidal gels to deformation and then move on to more complex systems of anisotropic particles and mixtures. Finally we note some more exotic materials with similar properties.

[{'version': 'v1', 'created': 'Thu, 8 Apr 2021 21:33:15 GMT'}]

2021-09-22

[array(['Royall', 'C. Patrick', ''], dtype=object) array(['Faers', 'Malcolm A.', ''], dtype=object) array(['Fussell', 'Sian L.', ''], dtype=object) array(['Hallett', 'James E.', ''], dtype=object)]

1701.00967

Bhuwan Joshi

Bhuwan Joshi (USO/PRL, India), Upendra Kushwaha (USO/PRL, India), Astrid M. Veronig (Univ. of Graz, Austria), Sajal Kumar Dhara (USO/PRL, India), A. Shanmugaraju (Arul Anandhar College, India), Yong-Jae Moon (Kyung Hee Univ., South Korea)

Formation and eruption of a flux rope from the sigmoid active region NOAA 11719 and associated M6.5 flare: A multi-wavelength study

18 pages, 13 figures, The Astrophysical Journal

10.3847/1538-4357/834/1/42

astro-ph.SR

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We investigate the formation, activation and eruption of a flux rope from the sigmoid active region NOAA 11719 by analyzing E(UV), X-ray and radio measurements. During the pre-eruption period of ~7 hours, the AIA 94 A images reveal the emergence of a coronal sigmoid through the interaction between two J-shaped bundles of loops which proceeds with multiple episodes of coronal loop brightenings and significant variations in the magnetic flux through the photosphere. These observations imply that repetitive magnetic reconnections likely play a key role in the formation of the sigmoidal flux rope in the corona and also contribute toward sustaining the temperature of the flux rope higher than the ambient coronal structures. Notably, the formation of the sigmoid is associated with the fast morphological evolution of an S-shaped filament channel in the chromosphere. The sigmoid activates toward eruption with the ascend of a large flux rope in the corona which is preceded by the decrease of photospheric magnetic flux through the core flaring region suggesting tether-cutting reconnection as a possible triggering mechanism. The flux rope eruption results in a two-ribbon M6.5 flare with a prolonged rise phase of ~21 min. The flare exhibits significant deviation from the standard flare model in the early rise phase during which a pair of J-shaped flare ribbons form and apparently exhibit converging motions parallel to the polarity inversion line which is further confirmed by the motions of HXR footpoint sources. In the later stages, the flare follows the standard flare model and the source region undergoes a complete sigmoid-to-arcade transformation.

[{'version': 'v1', 'created': 'Wed, 4 Jan 2017 11:18:02 GMT'}]

2017-01-05

[array(['Joshi', 'Bhuwan', '', 'USO/PRL, India'], dtype=object) array(['Kushwaha', 'Upendra', '', 'USO/PRL, India'], dtype=object) array(['Veronig', 'Astrid M.', '', 'Univ. of Graz, Austria'], dtype=object) array(['Dhara', 'Sajal Kumar', '', 'USO/PRL,\n India'], dtype=object) array(['Shanmugaraju', 'A.', '', 'Arul Anandhar College, India'], dtype=object) array(['Moon', 'Yong-Jae', '', 'Kyung\n Hee Univ., South Korea'], dtype=object) ]

2208.12949

Piet Lammers

Piet Lammers and Fabio Toninelli

Height function localisation on trees

15 pages, 1 figure

math.PR

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We study two models of discrete height functions, that is, models of random integer-valued functions on the vertices of a tree. First, we consider the random homomorphism model, in which neighbours must have a height difference of exactly one. The local law is uniform by definition. We prove that the height variance of this model is bounded, uniformly over all boundary conditions (both in terms of location and boundary heights). This implies a strong notion of localisation, uniformly over all extremal Gibbs measures of the system. For the second model, we consider directed trees, in which each vertex has exactly one parent and at least two children. We consider the locally uniform law on height functions which are monotone, that is, such that the height of the parent vertex is always at least the height of the child vertex. We provide a complete classification of all extremal gradient Gibbs measures, and describe exactly the localisation-delocalisation transition for this model. Typical extremal gradient Gibbs measures are localised also in this case. Localisation in both models is consistent with the observation that the Gaussian free field is localised on trees, which is an immediate consequence of transience of the random walk.

[{'version': 'v1', 'created': 'Sat, 27 Aug 2022 07:34:26 GMT'}]

2022-08-30

[array(['Lammers', 'Piet', ''], dtype=object) array(['Toninelli', 'Fabio', ''], dtype=object)]

1105.2878

Bin Chen

Bin Chen, Bo Ning and Jia-ju Zhang

Boundary Conditions for NHEK through Effective Action Approach

16 pages

10.1088/0256-307X/29/4/041101

hep-th

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We study the asymptotic symmetry group(ASG) of the near horizon geometry of extreme Kerr black hole through the effective action approach developed in 1007.1031. By requiring a finite boundary effective action, we derive a new set of asymptotic Killing vectors and boundary conditions, which are much more relaxed than the ones proposed in 0907.0303, and still allow a copy of conformal group as its ASG. In the covariant formalism, the asymptotic charges are finite, with the corresponding central charge vanishing. By using the quasi-local charge and introducing a plausible cut-off, we find that the higher order terms of the asymptotic Killing vectors, which could not be determined through the effective action approach, contribute to the central charge as well. We also show that the boundary conditions suggested in 0809.4266 lead to a divergent first order boundary effective action.

[{'version': 'v1', 'created': 'Sat, 14 May 2011 09:50:13 GMT'}]

2015-05-28

[array(['Chen', 'Bin', ''], dtype=object) array(['Ning', 'Bo', ''], dtype=object) array(['Zhang', 'Jia-ju', ''], dtype=object)]

1507.06234

David Stewart

Adam R. Thomas and David I. Stewart

The Jacobson--Morozov theorem and complete reducibility of Lie subalgebras

34 pages; v4 some small corrections; to appear in Proc LMS

10.1112/plms.12067

math.RT math.GR math.RA

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

In this paper we determine the precise extent to which the classical sl_2-theory of complex semisimple finite-dimensional Lie algebras due to Jacobson--Morozov and Kostant can be extended to positive characteristic. This builds on work of Pommerening and improves significantly upon previous attempts due to Springer--Steinberg and Carter/Spaltenstein. Our main advance arises by investigating quite fully the extent to which subalgebras of the Lie algebras of semisimple algebraic groups over algebraically closed fields k are G-completely reducible, a notion essentially due to Serre. For example if G is exceptional and char k=p\geq 5, we classify the triples (\h,\g,p) such that there exists a non-G-completely reducible subalgebra of \g isomorphic to \h. We do this also under the restriction that \h be a p-subalgebra of \g. We find that the notion of subalgebras being G-completely reducible effectively characterises when it is possible to find bijections between the conjugacy classes of sl_2-subalgebras and nilpotent orbits and it is this which allows us to prove our main theorems. For absolute completeness, we also show that there is essentially only one occasion in which a nilpotent element cannot be extended to an sl_2-triple when p\geq 3: this happens for the exceptional orbit in G_2 when p=3.

[{'version': 'v1', 'created': 'Wed, 22 Jul 2015 16:00:29 GMT'} {'version': 'v2', 'created': 'Mon, 28 Mar 2016 09:16:16 GMT'} {'version': 'v3', 'created': 'Sun, 5 Jun 2016 20:29:50 GMT'} {'version': 'v4', 'created': 'Mon, 2 Oct 2017 08:32:49 GMT'}]

2017-10-03

[array(['Thomas', 'Adam R.', ''], dtype=object) array(['Stewart', 'David I.', ''], dtype=object)]

2107.02178

Jorrit Kruthoff

Andreas Blommaert and Jorrit Kruthoff

Gravity without averaging

47 pages, 15 figures and many delta functions

SciPost Phys. 12, 073 (2022)

10.21468/SciPostPhys.12.2.073

hep-th

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We present a gravitational theory that interpolates between JT gravity, and a gravity theory with a fixed boundary Hamiltonian. For this, we consider a matrix integral with the insertion of a Gaussian with variance $\sigma^2$, centered around a matrix $\textsf{H}_0$. Tightening the Gaussian renders the matrix integral less random, and ultimately it collapses the ensemble to one Hamiltonian $\textsf{H}_0$. This model provides a concrete setup to study factorization, and what the gravity dual of a single member of the ensemble is. We find that as $\sigma^2$ is decreased, the JT gravity dilaton potential gets modified, and ultimately the gravity theory goes through a series of phase transitions, corresponding to a proliferation of extra macroscopic holes in the spacetime. Furthermore, we observe that in the Efetov model approach to random matrices, the non-averaged factorizing theory is described by one simple saddle point.

[{'version': 'v1', 'created': 'Mon, 5 Jul 2021 18:00:00 GMT'}]

2022-03-09

[array(['Blommaert', 'Andreas', ''], dtype=object) array(['Kruthoff', 'Jorrit', ''], dtype=object)]

1308.5537

Wansu Kim

Wansu Kim

Rapoport-Zink spaces of Hodge type

79 pages, Section 5 was rewritten

math.NT math.AG

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

When $p>2$, we construct a Hodge-type analogue of Rapoport-Zink spaces under the unramifiedness assumption, as formal schemes parametrising "deformations" (up to quasi-isogeny) of $p$-divisible groups with certain crystalline Tate tensors. We also define natural rigid analytic towers with expected extra structure, providing more examples of "local Shimura varieties" conjectured by Rapoport and Viehmann.

[{'version': 'v1', 'created': 'Mon, 26 Aug 2013 10:41:34 GMT'} {'version': 'v2', 'created': 'Fri, 7 Mar 2014 13:18:50 GMT'} {'version': 'v3', 'created': 'Thu, 7 Aug 2014 14:15:57 GMT'} {'version': 'v4', 'created': 'Mon, 22 Jun 2015 23:12:07 GMT'} {'version': 'v5', 'created': 'Thu, 7 Jan 2016 17:37:19 GMT'} {'version': 'v6', 'created': 'Mon, 29 Jan 2018 02:11:07 GMT'}]

2018-01-30

[array(['Kim', 'Wansu', ''], dtype=object)]

1001.1496

Feng Qi

Feng Qi and Bai-Ni Guo

Two monotonic functions involving gamma function and volume of unit ball

7 pages

Bai-Ni Guo and Feng Qi, Monotonicity of functions connected with the gamma function and the volume of the unit ball, Integral Transforms and Special Functions 23 (2012), no. 9, 701--708

10.1080/10652469.2011.627511

math.CA

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

In present paper, we prove the monotonicity of two functions involving the gamma function $\Gamma(x)$ and relating to the $n$-dimensional volume of the unit ball $\mathbb{B}^n$ in $\mathbb{R}^n$.

[{'version': 'v1', 'created': 'Sun, 10 Jan 2010 10:36:20 GMT'}]

2012-08-21

[array(['Qi', 'Feng', ''], dtype=object) array(['Guo', 'Bai-Ni', ''], dtype=object)]

astro-ph/0604611

Laila Alabidi Miss

Laila Alabidi

Non-gaussianity for a Two Component Hybrid Model of Inflation

10 pages and 5 figures. More extensive analysis of model, which shows that observable fnl is possible

JCAP 0610 (2006) 015

10.1088/1475-7516/2006/10/015

astro-ph

We consider a two component hybrid inflation model, in which two fields drive inflation. Our results show that this model generates an observable non-gaussian contribution to the curvature spectrum, within the limits allowed by the recent WMAP year 3 data. We show that if one field has a mass less than zero, and an initial field value less than 0.06Mpl while the other field has a mass greater than zero, and initial field value ranging between 0.5Mpl and Mpl then the non-gaussianity is observable with 1<fnl<1.5, but that fnl becomes much less than the observable limit should we take both masses to have the same sign, or if we loosened the constraints on the initial field values.

[{'version': 'v1', 'created': 'Fri, 28 Apr 2006 14:41:04 GMT'} {'version': 'v2', 'created': 'Tue, 4 Jul 2006 15:26:23 GMT'}]

2009-11-11

[array(['Alabidi', 'Laila', ''], dtype=object)]

1012.5058

Tamas Csorgo

T. Csorgo (Harvard U. and MTA KFKI RMKI), R. Vertesi (MTA KFKI RMKI) and J. Sziklai (MTA KFKI RMKI)

U_A(1) Symmetry Restoration from an In-Medium eta' Mass Reduction in sqrt(s(NN)) = 200 GeV Au+Au Collisions

12 pages, 5 figures, to appear in the Proceedings of the Gribov'80 Memorial Workshop

10.1142/9789814350198_0029

nucl-ex hep-ph nucl-th

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

A reduction of the mass of the eta'(958) meson may signal restoration of the U_A(1) symmetry in a hot and dense hadronic matter, corresponding to the return of the 9th, "prodigal" Goldstone boson. We report on an analysis of a combined PHENIX and STAR data set on the intercept parameter of the two-pion Bose-Einstein correlation functions, as measuremed in sqrt(s(NN)) = 200 GeV Au + Au collisions at RHIC. To describe this combined PHENIX and STAR dataset, an in-medium eta' mass reduction of at least 200 MeV is needed, at the 99.9 % confidence level in a broad model class of resonance abundances.

[{'version': 'v1', 'created': 'Wed, 22 Dec 2010 17:57:35 GMT'}]

2017-08-23

[array(['Csorgo', 'T.', '', 'Harvard U. and MTA KFKI RMKI'], dtype=object) array(['Vertesi', 'R.', '', 'MTA KFKI RMKI'], dtype=object) array(['Sziklai', 'J.', '', 'MTA KFKI RMKI'], dtype=object)]

2006.06635

Hugo Richard

Hugo Richard, Luigi Gresele, Aapo Hyv\"arinen, Bertrand Thirion, Alexandre Gramfort, Pierre Ablin

Modeling Shared Responses in Neuroimaging Studies through MultiView ICA

Accepted to NeurIPS 2020

stat.ML cs.LG

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Group studies involving large cohorts of subjects are important to draw general conclusions about brain functional organization. However, the aggregation of data coming from multiple subjects is challenging, since it requires accounting for large variability in anatomy, functional topography and stimulus response across individuals. Data modeling is especially hard for ecologically relevant conditions such as movie watching, where the experimental setup does not imply well-defined cognitive operations. We propose a novel MultiView Independent Component Analysis (ICA) model for group studies, where data from each subject are modeled as a linear combination of shared independent sources plus noise. Contrary to most group-ICA procedures, the likelihood of the model is available in closed form. We develop an alternate quasi-Newton method for maximizing the likelihood, which is robust and converges quickly. We demonstrate the usefulness of our approach first on fMRI data, where our model demonstrates improved sensitivity in identifying common sources among subjects. Moreover, the sources recovered by our model exhibit lower between-session variability than other methods.On magnetoencephalography (MEG) data, our method yields more accurate source localization on phantom data. Applied on 200 subjects from the Cam-CAN dataset it reveals a clear sequence of evoked activity in sensor and source space. The code is freely available at https://github.com/hugorichard/multiviewica.

[{'version': 'v1', 'created': 'Thu, 11 Jun 2020 17:29:53 GMT'} {'version': 'v2', 'created': 'Fri, 12 Jun 2020 15:38:46 GMT'} {'version': 'v3', 'created': 'Fri, 18 Dec 2020 13:08:03 GMT'} {'version': 'v4', 'created': 'Thu, 24 Dec 2020 10:18:29 GMT'}]

2020-12-25

[array(['Richard', 'Hugo', ''], dtype=object) array(['Gresele', 'Luigi', ''], dtype=object) array(['Hyvärinen', 'Aapo', ''], dtype=object) array(['Thirion', 'Bertrand', ''], dtype=object) array(['Gramfort', 'Alexandre', ''], dtype=object) array(['Ablin', 'Pierre', ''], dtype=object)]

1907.07626

Zhiyuan Tang

Zhiyuan Tang, Dong Wang and Liming Song

AP19-OLR Challenge: Three Tasks and Their Baselines

arXiv admin note: substantial text overlap with arXiv:1806.00616, arXiv:1706.09742, arXiv:1609.08445

eess.AS cs.CL cs.SD

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

This paper introduces the fourth oriental language recognition (OLR) challenge AP19-OLR, including the data profile, the tasks and the evaluation principles. The OLR challenge has been held successfully for three consecutive years, along with APSIPA Annual Summit and Conference (APSIPA ASC). The challenge this year still focuses on practical and challenging tasks, precisely (1) short-utterance LID, (2) cross-channel LID and (3) zero-resource LID. The event this year includes more languages and more real-life data provided by SpeechOcean and the NSFC M2ASR project. All the data is free for participants. Recipes for x-vector system and back-end evaluation are also conducted as baselines for the three tasks. The participants can refer to these online-published recipes to deploy LID systems for convenience. We report the baseline results on the three tasks and demonstrate that the three tasks are worth some efforts to achieve better performance.

[{'version': 'v1', 'created': 'Tue, 16 Jul 2019 03:55:21 GMT'} {'version': 'v2', 'created': 'Tue, 13 Aug 2019 09:46:14 GMT'} {'version': 'v3', 'created': 'Sun, 1 Sep 2019 10:25:16 GMT'}]

2019-09-04

[array(['Tang', 'Zhiyuan', ''], dtype=object) array(['Wang', 'Dong', ''], dtype=object) array(['Song', 'Liming', ''], dtype=object)]

2212.10694

Lucas Benigni

Lucas Benigni and Giorgio Cipolloni

Fluctuations of eigenvector overlaps and the Berry conjecture for Wigner matrices

16 pages, 6 figures

math.PR math-ph math.MP

http://creativecommons.org/licenses/by/4.0/

We prove that any finite collection of quadratic forms (overlaps) of general deterministic matrices and eigenvectors of an $N\times N$ Wigner matrix has joint Gaussian fluctuations. This can be viewed as the random matrix analogue of the Berry random wave conjecture.

[{'version': 'v1', 'created': 'Tue, 20 Dec 2022 23:54:52 GMT'}]

2022-12-22

[array(['Benigni', 'Lucas', ''], dtype=object) array(['Cipolloni', 'Giorgio', ''], dtype=object)]

1208.5517

Peter R. Eisenhardt

Peter R. M. Eisenhardt, Jingwen Wu, Chao-Wei Tsai, Roberto Assef, Dominic Benford, Andrew Blain, Carrie Bridge, J. J. Condon, Michael C. Cushing, Roc Cutri, Neal J. Evans II, Chris Gelino, Roger L. Griffith, Carl J. Grillmair, Tom Jarrett, Carol J. Lonsdale, Frank J. Masci, Brian S. Mason, Sara Petty, Jack Sayers, S. Adam Stanford, Daniel Stern, Edward L. Wright, Lin Yan

The First Hyper-Luminous Infrared Galaxy Discovered by WISE

Published in 2012 August 20 Astrophysical Journal

Astrophysical Journal 755, 173, 2012

10.1088/0004-637X/755/2/173

astro-ph.CO

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We report the discovery by the Wide-field Infrared Survey Explorer of the z = 2.452 source WISE J181417.29+341224.9, the first hyperluminous source found in the WISE survey. WISE 1814+3412 is also the prototype for an all-sky sample of ~1000 extremely luminous "W1W2-dropouts" (sources faint or undetected by WISE at 3.4 and 4.6 microns and well detected at 12 or 22 microns). The WISE data and a 350 micron detection give a minimum bolometric luminosity of 3.7 x 10^13 Lsun, with ~10^14 Lsun plausible. Followup images reveal four nearby sources: a QSO and two Lyman Break Galaxies (LBGs) at z = 2.45, and an M dwarf star. The brighter LBG dominates the bolometric emission. Gravitational lensing is unlikely given the source locations and their different spectra and colors. The dominant LBG spectrum indicates a star formation rate ~300 Msun/yr, accounting for < 10% of the bolometric luminosity. Strong 22 micron emission relative to 350 microns implies that warm dust contributes significantly to the luminosity, while cooler dust normally associated with starbursts is constrained by an upper limit at 1.1 mm. Radio emission is ~10x above the far-infrared/radio correlation, indicating an active galactic nucleus is present. An obscured AGN combined with starburst and evolved stellar components can account for the observations. If the black hole mass follows the local M_BH-bulge mass relation, the implied Eddington ratio is >~4. WISE 1814+3412 may be a heavily obscured object where the peak AGN activity occurred prior to the peak era of star formation.

[{'version': 'v1', 'created': 'Mon, 27 Aug 2012 22:03:16 GMT'}]

2012-08-29

[array(['Eisenhardt', 'Peter R. M.', ''], dtype=object) array(['Wu', 'Jingwen', ''], dtype=object) array(['Tsai', 'Chao-Wei', ''], dtype=object) array(['Assef', 'Roberto', ''], dtype=object) array(['Benford', 'Dominic', ''], dtype=object) array(['Blain', 'Andrew', ''], dtype=object) array(['Bridge', 'Carrie', ''], dtype=object) array(['Condon', 'J. J.', ''], dtype=object) array(['Cushing', 'Michael C.', ''], dtype=object) array(['Cutri', 'Roc', ''], dtype=object) array(['Evans', 'Neal J.', 'II'], dtype=object) array(['Gelino', 'Chris', ''], dtype=object) array(['Griffith', 'Roger L.', ''], dtype=object) array(['Grillmair', 'Carl J.', ''], dtype=object) array(['Jarrett', 'Tom', ''], dtype=object) array(['Lonsdale', 'Carol J.', ''], dtype=object) array(['Masci', 'Frank J.', ''], dtype=object) array(['Mason', 'Brian S.', ''], dtype=object) array(['Petty', 'Sara', ''], dtype=object) array(['Sayers', 'Jack', ''], dtype=object) array(['Stanford', 'S. Adam', ''], dtype=object) array(['Stern', 'Daniel', ''], dtype=object) array(['Wright', 'Edward L.', ''], dtype=object) array(['Yan', 'Lin', ''], dtype=object)]

hep-th/9607085

Antonio Liguori

A. Liguori (Pisa U.), M. Mintchev (INFN, Pisa & Pisa U.), L. Zhao (Xibei U.)

Boundary Exchange Algebras and Scattering on the Half Line

Enlarged version, to appear in Comm. Math. Phys. Tex file, macros included, no figures, 32 pages

Commun.Math.Phys. 194 (1998) 569-589

10.1007/s002200050369

IFUP-TH 58/96

hep-th

Some algebraic aspects of field quantization in space-time with boundaries are discussed. We introduce an associative algebra, whose exchange properties are inferred from the scattering processes in integrable models with reflecting boundary conditions on the half line. The basic properties of this algebra are established and the Fock representations associated with certain involutions are derived. We apply these results for the construction of quantum fields and for the study of scattering on the half line.

[{'version': 'v1', 'created': 'Thu, 11 Jul 1996 08:37:47 GMT'} {'version': 'v2', 'created': 'Fri, 7 Nov 1997 14:21:41 GMT'}]

2009-10-30

[array(['Liguori', 'A.', '', 'Pisa U.'], dtype=object) array(['Mintchev', 'M.', '', 'INFN, Pisa & Pisa U.'], dtype=object) array(['Zhao', 'L.', '', 'Xibei U.'], dtype=object)]

cond-mat/0005095

Silvio Franz

Silvio Franz and Giorgio Parisi

On nonlinear susceptibility in supercooled liquids

Proceedings of the Conference "Unifying Concepts in Glass Physics" ICTP, Trieste, 15 - 18 September 1999

J. Phys.: Condens. Matter 12 (2000) 6335

10.1088/0953-8984/12/29/305

cond-mat.dis-nn cond-mat.stat-mech

In this paper, we discuss theoretically the behavior of the four point nonlinear susceptibility and its associated correlation length for supercooled liquids close to the Mode Coupling instability temperature $T_c$. We work in the theoretical framework of the glass transition as described by mean field theory of disordered systems, and the hypernetted chain approximation. Our results give an interpretation framework for recent numerical findings on heterogeneities in supercooled liquid dynamics.

[{'version': 'v1', 'created': 'Thu, 4 May 2000 15:47:18 GMT'}]

2009-10-31

[array(['Franz', 'Silvio', ''], dtype=object) array(['Parisi', 'Giorgio', ''], dtype=object)]

1512.07099

Marcin Wie\'sniak dr hab.

Krzysztof Roso{\l}ek, Marcin Wie\'sniak, Lukas Knips

Quadratic Entanglement Criteria for Qutrits

5 pages, 1 figure, new Author added

quant-ph

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

The problem of detecting non-classical correlations of states of many qudits is incomparably more involved than in a case of qubits. The reason is that for qubits we have a convenient description of the system by the means of the well-studied correlation tensor. Simply, the complete information about the state can be encoded in mean values of dichotomic measurements. WE demonstrate that for three-dimensional quantum subsystems we are able to formulate nonlinear entanglement criteria of the state with existing formalisms. We also point out where the idea for constructing these criteria fails for higher-dimensional systems, which poses well-defined open questions.

[{'version': 'v1', 'created': 'Tue, 22 Dec 2015 14:18:44 GMT'} {'version': 'v2', 'created': 'Thu, 6 Oct 2016 14:06:54 GMT'} {'version': 'v3', 'created': 'Mon, 17 Oct 2016 12:08:36 GMT'} {'version': 'v4', 'created': 'Wed, 26 Oct 2016 11:51:26 GMT'}]

2016-10-27

[array(['Rosołek', 'Krzysztof', ''], dtype=object) array(['Wieśniak', 'Marcin', ''], dtype=object) array(['Knips', 'Lukas', ''], dtype=object)]

hep-th/0403036

Jerzy Szwed

Jerzy Szwed

The "square root" of the Dirac equation and solutions on superspace

9 pages

Acta Phys.Polon. B37 (2006) 455-462

CPT-2004/P.008

hep-th hep-ph

The "square root" of the Dirac operator derived on the superspace is used to construct supersymmetric field equations. In addition to the recently found solution - a vector supermultiplet I demonstrate how a chiral supermultiplet follows as the solution. Both vector and chiral supermultiplets are shown to obey appropriate (massless) equations of motion. This procedure yields thus a complete set of fields and their equations necessary to construct renormalizable supersymmetric theories. The problem of masses and interaction is also discussed.

[{'version': 'v1', 'created': 'Tue, 2 Mar 2004 13:55:48 GMT'} {'version': 'v2', 'created': 'Wed, 26 May 2004 14:14:20 GMT'} {'version': 'v3', 'created': 'Tue, 29 Jun 2004 10:50:01 GMT'}]

2007-05-23

[array(['Szwed', 'Jerzy', ''], dtype=object)]

2303.01104

Sereina Riniker

Moritz Th\"urlemann, Sereina Riniker

Energy-Based Clustering: Fast and Robust Clustering of Data with Known Likelihood Functions

physics.chem-ph

http://creativecommons.org/licenses/by-nc-sa/4.0/

Clustering has become an indispensable tool in the presence of increasingly large and complex data sets. Most clustering algorithms depend, either explicitly or implicitly, on the sampled density. However, estimated densities are fragile due to the curse of dimensionality and finite sampling effects, for instance in molecular dynamics simulations. To avoid the dependence on estimated densities, an energy-based clustering (EBC) algorithm based on the Metropolis acceptance criterion is developed in this work. In the proposed formulation, EBC can be considered a generalization of spectral clustering in the limit of large temperatures. Taking the potential energy of a sample explicitly into account alleviates requirements regarding the distribution of the data. In addition, it permits the subsampling of densely sampled regions, which can result in significant speed-ups and sublinear scaling. The algorithm is validated on a range of test systems including molecular dynamics trajectories of alanine dipeptide and the Trp-cage miniprotein. Our results show that including information about the potential-energy surface can largely decouple clustering from the sampling density.

[{'version': 'v1', 'created': 'Thu, 2 Mar 2023 09:36:33 GMT'}]

2023-03-03

[array(['Thürlemann', 'Moritz', ''], dtype=object) array(['Riniker', 'Sereina', ''], dtype=object)]

2105.14876

Nestor Cabello

Nestor Cabello, Elham Naghizade, Jianzhong Qi, Lars Kulik

Fast, Accurate and Interpretable Time Series Classification Through Randomization

cs.LG stat.ML

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Time series classification (TSC) aims to predict the class label of a given time series, which is critical to a rich set of application areas such as economics and medicine. State-of-the-art TSC methods have mostly focused on classification accuracy and efficiency, without considering the interpretability of their classifications, which is an important property required by modern applications such as appliance modeling and legislation such as the European General Data Protection Regulation. To address this gap, we propose a novel TSC method - the Randomized-Supervised Time Series Forest (r-STSF). r-STSF is highly efficient, achieves state-of-the-art classification accuracy and enables interpretability. r-STSF takes an efficient interval-based approach to classify time series according to aggregate values of discriminatory sub-series (intervals). To achieve state-of-the-art accuracy, r-STSF builds an ensemble of randomized trees using the discriminatory sub-series. It uses four time series representations, nine aggregation functions and a supervised binary-inspired search combined with a feature ranking metric to identify highly discriminatory sub-series. The discriminatory sub-series enable interpretable classifications. Experiments on extensive datasets show that r-STSF achieves state-of-the-art accuracy while being orders of magnitude faster than most existing TSC methods. It is the only classifier from the state-of-the-art group that enables interpretability. Our findings also highlight that r-STSF is the best TSC method when classifying complex time series datasets.

[{'version': 'v1', 'created': 'Mon, 31 May 2021 10:59:11 GMT'}]

2021-06-01

[array(['Cabello', 'Nestor', ''], dtype=object) array(['Naghizade', 'Elham', ''], dtype=object) array(['Qi', 'Jianzhong', ''], dtype=object) array(['Kulik', 'Lars', ''], dtype=object)]

0808.2120

Dmitri Panyushev

Dmitri I. Panyushev

Adjoint vector fields and differential operators on representation spaces

24 pages, to appear in Bull LMS

10.1112/blms/bdn090

math.RT math.AG

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Let $G$ be a semisimple algebraic group with Lie algebra $\g$. In 1979, J. Dixmier proved that any vector field annihilating all $G$-invariant polynomials on $\g$ lies in the $\bbk[\g]$-module generated by the "adjoint vector fields", i.e., vector fields $\varsigma$ of the form $\varsigma(y)(x)=[x,y]$, $x,y\in\g$. A substantial generalisation of Dixmier's theorem was found by Levasseur and Stafford. They explicitly described the centraliser of $\bbk[\g]^G$ in the algebra of differential operators on $\g$. On the level of vector fields, their result reduces to Dixmier's theorem. The purpose of this paper is to explore similar problems in the general context of affine algebraic groups and their rational representations.

[{'version': 'v1', 'created': 'Fri, 15 Aug 2008 09:48:43 GMT'}]

2014-02-26

[array(['Panyushev', 'Dmitri I.', ''], dtype=object)]

1209.3082

Lily Yen

Lily Yen

A Bijection for Crossings and Nestings

math.CO

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

For a subclass of matchings, set partitions, and permutations, we describe a direct bijection involving only arc annotated diagrams that not only interchanges maximum nesting and crossing numbers, but also all refinements of crossing and nesting numbers. Furthermore, we show that the bijection cannot be applied to a similar class of coloured arc annotated diagrams.

[{'version': 'v1', 'created': 'Fri, 14 Sep 2012 03:18:35 GMT'} {'version': 'v2', 'created': 'Sun, 21 Oct 2012 15:36:28 GMT'}]

2012-10-23

[array(['Yen', 'Lily', ''], dtype=object)]

2003.06295

Sergei Urazhdin

Guanxiong Chen, Dylan Collette, and Sergei Urazhdin

Experimental demonstration and analysis of random field effects in ferromagnet/antiferromagnet bilayers

funding information and a few typos corrected

Phys. Rev. B 101, 144427 (2020)

10.1103/PhysRevB.101.144427

cond-mat.mtrl-sci cond-mat.dis-nn cond-mat.mes-hall

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

More than 30 years ago, Malozemoff (Phys. Rev. B 35, 3679 (1987)) hypothesized that exchange interaction at the interface between a ferromagnet (F) and an antiferromagnet (AF) can act as an effective random field, which can profoundly affect the magnetic properties of the system. However, until now this hypothesis has not been directly experimentally tested. We utilize magnetoelectronic measurements to analyze the effective exchange fields at Permalloy/CoO interface. Our results cannot be explained in terms of quasi-uniform effective exchange fields, but are in agreement with the random-field hypothesis of Malozemoff. The presented approach opens a new route for the quantitative analysis of effective exchange fields and anisotropies in magnetic heterostructures for memory, sensing and computing applications.

[{'version': 'v1', 'created': 'Fri, 13 Mar 2020 13:47:31 GMT'} {'version': 'v2', 'created': 'Mon, 20 Apr 2020 21:49:42 GMT'}]

2020-04-22

[array(['Chen', 'Guanxiong', ''], dtype=object) array(['Collette', 'Dylan', ''], dtype=object) array(['Urazhdin', 'Sergei', ''], dtype=object)]

1709.04200

Yves Elskens

Jasvendra Tyagi, Hitendra Malik, Yves Elskens (PIIM), Nicolas Lemoine (IJL), Fabrice Doveil (PIIM)

Low frequency resistive instability in a dusty Hall thruster plasma

physics.plasm-ph

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Along with crossed electric and magnetic fields in a Hall thruster, a radial component of electric field is generated that takes ions toward the walls, which causes sputtering and produces dust contamination in the thruster plasma. Considering negatively charged dust particles in the Hall thruster, we approach analytically the resistive instability by taking into account the oscillations of dust particles, ions and electrons along with finite temperatures of ions and electrons. In typical Hall thruster regimes, the resistive instability growth rate increases with higher collision rates in the plasma, stronger magnetic field but it decreases with higher mass of the dust and higher temperature of the ions and electrons. In comparison with dust-free models, the presence of dust results into a drop of the resistive instability growth rate by three orders of magnitude, but the growth rate increases slowly for dust densities within the typical range.

[{'version': 'v1', 'created': 'Wed, 13 Sep 2017 09:08:59 GMT'}]

2017-09-14

[array(['Tyagi', 'Jasvendra', '', 'PIIM'], dtype=object) array(['Malik', 'Hitendra', '', 'PIIM'], dtype=object) array(['Elskens', 'Yves', '', 'PIIM'], dtype=object) array(['Lemoine', 'Nicolas', '', 'IJL'], dtype=object) array(['Doveil', 'Fabrice', '', 'PIIM'], dtype=object)]

0807.2184

Jimmy Tseng

Jimmy Tseng

Schmidt games and Markov partitions

32 pages

10.1088/0951-7715/22/3/001

math.DS

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Let T be a C^2-expanding self-map of a compact, connected, smooth, Riemannian manifold M. We correct a minor gap in the proof of a theorem from the literature: the set of points whose forward orbits are nondense has full Hausdorff dimension. Our correction allows us to strengthen the theorem. Combining the correction with Schmidt games, we generalize the theorem in dimension one: given a point x in M, the set of points whose forward orbit closures miss x is a winning set.

[{'version': 'v1', 'created': 'Mon, 14 Jul 2008 15:46:23 GMT'}]

2009-11-13

[array(['Tseng', 'Jimmy', ''], dtype=object)]

hep-ph/0302013

Wally Melnitchouk

F.E. Close and W. Melnitchouk

Symmetry breaking and quark-hadron duality in structure functions

30 pages, 9 figures, to appear in Phys. Rev. C

Phys.Rev.C68:035210,2003

10.1103/PhysRevC.68.035210

OUTP-03-03P, JLAB-THY-01-28

hep-ph hep-ex nucl-ex nucl-th

We identify conditions under which a summation over nucleon resonances can yield, via quark-hadron duality, parton model results for electromagnetic and neutrino structure functions at large x. While a summation over the lowest even and odd parity multiplets is sufficient to achieve duality in the symmetric quark model, a suppression of transitions to specific final states is required for more realistic cases incorporating SU(6) breaking. We outline several scenarios consistent with duality, discuss their implications for the high Q^2 behavior of transition form factors, and illustrate how they can expose the patterns in the flavor-spin dependence of inter-quark forces.

[{'version': 'v1', 'created': 'Mon, 3 Feb 2003 18:44:08 GMT'} {'version': 'v2', 'created': 'Tue, 12 Aug 2003 15:38:18 GMT'}]

2008-11-26

[array(['Close', 'F. E.', ''], dtype=object) array(['Melnitchouk', 'W.', ''], dtype=object)]

1702.06684

Amritanshu Prasad

N. Karimilla Bi, Amritanshu Prasad and P. Giftson Santhosh

Residues modulo powers of two in the Young-Fibonacci lattice

9 pages, 3 figures

math.CO math.NT

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We study the subgraph of the Young-Fibonacci graph induced by elements with odd $f$-statistic (the $f$-statistic of an element $w$ of a differential graded poset is the number of saturated chains from the minimal element of the poset to $w$). We show that this subgraph is a binary tree. Moreover, the odd residues of the $f$-statistics in a row of this tree equidistibute modulo any power two. This is equivalent to a purely number theoretic result about the equidistribution of residues modulo powers of two among the products of distinct odd numbers less than a fixed number.

[{'version': 'v1', 'created': 'Wed, 22 Feb 2017 06:29:10 GMT'}]

2017-02-23

[array(['Bi', 'N. Karimilla', ''], dtype=object) array(['Prasad', 'Amritanshu', ''], dtype=object) array(['Santhosh', 'P. Giftson', ''], dtype=object)]

2004.01023

Alexander Schindler

Alexander Schindler, Andrew Lindley, Anahid Jalali, Martin Boyer, Sergiu Gordea, Ross King

Multi-Modal Video Forensic Platform for Investigating Post-Terrorist Attack Scenarios

In Proceedings of the 11th ACM Multimedia Systems Conference (MMSys2020), June 06-11, 2020, Istanbul, Turkey

cs.MM cs.CV cs.CY cs.SD eess.AS

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

The forensic investigation of a terrorist attack poses a significant challenge to the investigative authorities, as often several thousand hours of video footage must be viewed. Large scale Video Analytic Platforms (VAP) assist law enforcement agencies (LEA) in identifying suspects and securing evidence. Current platforms focus primarily on the integration of different computer vision methods and thus are restricted to a single modality. We present a video analytic platform that integrates visual and audio analytic modules and fuses information from surveillance cameras and video uploads from eyewitnesses. Videos are analyzed according their acoustic and visual content. Specifically, Audio Event Detection is applied to index the content according to attack-specific acoustic concepts. Audio similarity search is utilized to identify similar video sequences recorded from different perspectives. Visual object detection and tracking are used to index the content according to relevant concepts. Innovative user-interface concepts are introduced to harness the full potential of the heterogeneous results of the analytical modules, allowing investigators to more quickly follow-up on leads and eyewitness reports.

[{'version': 'v1', 'created': 'Thu, 2 Apr 2020 14:29:27 GMT'}]

2020-04-03

[array(['Schindler', 'Alexander', ''], dtype=object) array(['Lindley', 'Andrew', ''], dtype=object) array(['Jalali', 'Anahid', ''], dtype=object) array(['Boyer', 'Martin', ''], dtype=object) array(['Gordea', 'Sergiu', ''], dtype=object) array(['King', 'Ross', ''], dtype=object)]

1810.05332

Xiaoji Zhou

Pengju Tang, Peng Peng, Zhihan Li, Xuzong Chen, Xiaopeng Li, and Xiaoji Zhou

Parallel multicomponent interferometer with a spinor Bose-Einstein condensate

9 pages

Phys. Rev. A 100, 013618 (2019)

10.1103/PhysRevA.100.013618

cond-mat.quant-gas

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Atom interferometry with high visibility is of high demand for precision measurements. Here, a parallel multicomponent interferometer is achieved by preparing a spin-$2$ Bose-Einstein condensate of $^{87}$Rb atoms confined in a hybrid magneto-optical trap. After the preparation of a spinor Bose-Einstein condensate with spin degrees of freedom entangled, we observe four spatial interference patterns in each run of measurements corresponding to four hyperfine states we mainly populate in the experiment. The atomic populations in different Zeeman sublevels are made controllably using magnetic-field-pulse induced Majorana transitions. The spatial separation of atom cloud in different hyperfine states is reached by Stern-Gerlach momentum splitting. The high visibility of the interference fringes is reached by designing a proper overlap of the interfering wave packets. Due to uncontrollable phase accumulation in Majorana transitions, the phase of each individual spin is found to be subjected to unreproducible shift in multiple experimental runs. However, the relative phase across different spins is stable, paving a way towards noise-resilient multicomponent parallel interferometers.

[{'version': 'v1', 'created': 'Fri, 12 Oct 2018 03:05:20 GMT'} {'version': 'v2', 'created': 'Tue, 16 Jul 2019 08:38:32 GMT'} {'version': 'v3', 'created': 'Wed, 31 Jul 2019 06:16:12 GMT'}]

2019-08-01

[array(['Tang', 'Pengju', ''], dtype=object) array(['Peng', 'Peng', ''], dtype=object) array(['Li', 'Zhihan', ''], dtype=object) array(['Chen', 'Xuzong', ''], dtype=object) array(['Li', 'Xiaopeng', ''], dtype=object) array(['Zhou', 'Xiaoji', ''], dtype=object)]

1109.0139

Yaroslav Kartashov

Olga V. Borovkova, Yaroslav V. Kartashov, Valery E. Lobanov, Victor A. Vysloukh, Lluis Torner

Vortex twins and anti-twins supported by multi-ring gain landscapes

3 pages, 3 figures, to appear in Optics Letters

Optics Letters 36, 3783 (2011)

10.1364/OL.36.003783

physics.optics nlin.PS

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We address the properties of multi-vortex soliton complexes supported by multi-ring gain landscapes in focusing Kerr nonlinear media with strong two-photon absorption. Stable complexes incorporating two, three, or four vortices featuring opposite or identical topological charges are shown to exist. In the simplest geometries with two amplifying rings vortex twins with equal topological charges exhibit asymmetric intensity distributions, while vortex anti-twins may be symmetric or asymmetric, depending on the gain level and separation between rings. Different arrangements of amplifying rings allow generation of stable multi-vortex soliton complexes with various topologies, with twins and anti-twins as building blocks.

[{'version': 'v1', 'created': 'Thu, 1 Sep 2011 10:03:15 GMT'}]

2015-05-30

[array(['Borovkova', 'Olga V.', ''], dtype=object) array(['Kartashov', 'Yaroslav V.', ''], dtype=object) array(['Lobanov', 'Valery E.', ''], dtype=object) array(['Vysloukh', 'Victor A.', ''], dtype=object) array(['Torner', 'Lluis', ''], dtype=object)]

1207.0564

Qingsong Zou

Zhimin Zhang, Qingsong Zou

Finite volume schemes of any order on rectangular meshes

15 pages

math.NA math.AP

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

In this paper, we analyze vertex-centered finite volume method (FVM) of any order for elliptic equations on rectangular meshes. The novelty is a unified proof of the inf-sup condition, based on which, we show that the FVM approximation converges to the exact solution with the optimal rate in the energy norm. Furthermore, we discuss superconvergence property of the FVM solution. With the help of this superconvergence result, we find that the FVM solution also converges to the exact solution with the optimal rate in the $L^2$-norm. Finally, we validate our theory with several numerical experiments.

[{'version': 'v1', 'created': 'Tue, 3 Jul 2012 02:28:57 GMT'}]

2012-07-04

[array(['Zhang', 'Zhimin', ''], dtype=object) array(['Zou', 'Qingsong', ''], dtype=object)]

astro-ph/0003203

Daniel E. Vanden Berk

Daniel E. Vanden Berk (1 and 2), Chris Stoughton (1), Arlin P. S. Crotts (3), David Tytler (4), and David Kirkman (4) ((1) Fermilab, (2) McDonald Observatory, (3) Columbia University, (4) UC San Diego)

QSOs and Absorption Line Systems Surrounding the Hubble Deep Field

36 pages, including 9 figures and 8 tables. Accepted for publication in the Astronomical Journal

Astron.J. 119 (2000) 2571-2582

10.1086/301404

astro-ph

We have imaged a 45x45 sq. arcmin. area centered on the Hubble Deep Field (HDF) in UBVRI passbands, down to respective limiting magnitudes of approximately 21.5, 22.5, 22.2, 22.2, and 21.2. The principal goals of the survey are to identify QSOs and to map structure traced by luminous galaxies and QSO absorption line systems in a wide volume containing the HDF. We have selected QSO candidates from color space, and identified 4 QSOs and 2 narrow emission-line galaxies (NELGs) which have not previously been discovered, bringing the total number of known QSOs in the area to 19. The bright z=1.305 QSO only 12 arcmin. away from the HDF raises the northern HDF to nearly the same status as the HDF-S, which was selected to be proximate to a bright QSO. About half of the QSO candidates remain for spectroscopic verification. Absorption line spectroscopy has been obtained for 3 bright QSOs in the field, using the Keck 10m, ARC 3.5m, and MDM 2.4m telescopes. Five heavy-element absorption line systems have been identified, 4 of which overlap the well-explored redshift range covered by deep galaxy redshift surveys towards the HDF. The two absorbers at z=0.5565 and z=0.5621 occur at the same redshift as the second most populated redshift peak in the galaxy distribution, but each is more than 7Mpc/h (comoving, Omega_M=1, Omega_L=0) away from the HDF line of sight in the transverse dimension. This supports more indirect evidence that the galaxy redshift peaks are contained within large sheet-like structures which traverse the HDF, and may be precursors to large-scale ``pancake'' structures seen in the present-day galaxy distribution.

[{'version': 'v1', 'created': 'Tue, 14 Mar 2000 19:39:00 GMT'}]

2009-10-31

[array(['Berk', 'Daniel E. Vanden', '', '1 and 2'], dtype=object) array(['Stoughton', 'Chris', ''], dtype=object) array(['Crotts', 'Arlin P. S.', ''], dtype=object) array(['Tytler', 'David', ''], dtype=object) array(['Kirkman', 'David', ''], dtype=object)]

astro-ph/0212291

Sean Matt

S. Matt, R. M. Winglee, and K.-H. Bohm

Collimation of a Central Wind by a Disk-Associated Magnetic Field

4 pgs, 2 figs; to appear in Jets 2002: Theory & Observations, Proceedings of the September 2002 JENAM meeting in Porto, Portugal

Mon.Not.Roy.Astron.Soc. 345 (2003) 660

10.1046/j.1365-8711.2003.06977.x

astro-ph

We present the results of time-dependent, numerical magnetohydrodynamic simulations of a realistic young stellar object outflow model with the addition of a disk-associated magnetic field. The outflow produced by the magnetic star-disk interaction consists of an episodic jet plus a wide-angle wind with an outflow speed comparable to that of the jet (100--200 km/s). An initially vertical field of << 0.1 Gauss, embedded in the disk, has little effect on the wind launching mechanism, but we show that it collimates the entire flow (jet + wide wind) at large (several AU) distances. The collimation does not depend on the polarity of the vertical field. We also discuss the possible origin of the disk-associated field.

[{'version': 'v1', 'created': 'Thu, 12 Dec 2002 16:15:22 GMT'}]

2009-11-07

[array(['Matt', 'S.', ''], dtype=object) array(['Winglee', 'R. M.', ''], dtype=object) array(['Bohm', 'K. -H.', ''], dtype=object)]

1901.01819

Luiz Capretz Dr.

Luiz Fernando Capretz and Faheem Ahmed

A Call to Promote Soft Skills in Software Engineering

Psychology and Cognitive Sciences, Editorial, 4(1):e1-e3, 2018

10.17140/PCSOJ-4-e011

cs.SE

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We have been thinking about other aspects of software engineering for many years; the missing link in engineering software is the soft skills set, essential in the software development process. Although soft skills are among the most important aspects in the creation of software, they are often overlooked by educators and practitioners. One of the main reasons for the oversight is that soft skills are usually related to social and personality factors, i.e., teamwork, motivation, commitment, leadership, multi-culturalism, emotions, interpersonal skills, etc. This editorial is a manifesto declaring the importance of soft skills in software engineering with the intention to draw professionals attention to these topics. We have approached this issue by mentioning what we know about the field, what we believe to be evident, and which topics need further investigation. Important references to back up our claims are also included. Software engineers take pride in the depth of their technical expertise, which separates them from the crowd. But, what makes a good software engineer? First, it is the technical knowledge of relevant methodologies and techniques (i.e. hard skills), as well as the skills necessary for applying that knowledge in practice. Second, but nonetheless important, it is a set of soft skills, in particular collaboration, communication, problem-solving and similar interpersonal and critical thinking skills that are expected from software engineering professionals. In other words, software engineers need both hard and soft skills in order to be successful at the workplace.

[{'version': 'v1', 'created': 'Wed, 12 Dec 2018 21:17:10 GMT'}]

2019-01-08

[array(['Capretz', 'Luiz Fernando', ''], dtype=object) array(['Ahmed', 'Faheem', ''], dtype=object)]

2202.07839

Mark Watson

Mark Watson

Relativistic Wind Farm Effect: Possibly Turbulent Flow of a Charged, Massless Relativistic Fluid in Graphene

7 pages, 9 figures

10.1063/5.0093429

cond-mat.str-el astro-ph.HE physics.flu-dyn

http://creativecommons.org/licenses/by/4.0/

At low Reynolds numbers, the wind flow in the wake of a single wind turbine is generally not turbulent. However, turbines in wind farms affect each other's wakes so that a turbulent flow can arise. In the present work, an analogue of this effect for the massless charge carrier flow around obstacles in graphene is outlined. We use a relativistic hydrodynamic simulation to analyze the flow in a sample containing impurities. Depending on the density of impurities in the sample, we indeed find evidence for potentially turbulent flow and discuss experimental consequences.

[{'version': 'v1', 'created': 'Wed, 16 Feb 2022 03:19:54 GMT'}]

2022-08-24

[array(['Watson', 'Mark', ''], dtype=object)]

1412.6421

Xinhua Xie Dr.

Xinhua Xie

Two-Dimensional Attosecond Electron Wave Packet Interferometry

Phys. Rev. Lett. 114, 173003 (2015)

10.1103/PhysRevLett.114.173003

physics.atom-ph

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We propose a two-dimensional interferometry based on electron wave packet interference with a cycle-shaped orthogonally polarized two-color laser field. With such method, sub-cycle and inter-cycle interferences can be disentangled into different direction in the measured photoelectron momentum spectra. With the cycle-shaped laser field, the Coulomb influence can be minimized and the overlapping of interference fringes with the complicate low-energy structures can be avoided as well. The contributions of excitation effect and long-range Coulomb potential can be traced in the Fourier domain of the photoelectron distributions. With these advantages, it allows to get precise information on valence electron dynamics of atoms or molecules with attosecond resolution and additional spatial information with angstrom resolution.

[{'version': 'v1', 'created': 'Fri, 19 Dec 2014 16:33:26 GMT'}]

2015-06-04

[array(['Xie', 'Xinhua', ''], dtype=object)]

1111.5867

Arian Maleki

Arian Maleki, Manjari Narayan, Richard G. Baraniuk

Suboptimality of Nonlocal Means for Images with Sharp Edges

33 pages, 3 figures

math.ST cs.CV cs.IT math.IT stat.TH

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We conduct an asymptotic risk analysis of the nonlocal means image denoising algorithm for the Horizon class of images that are piecewise constant with a sharp edge discontinuity. We prove that the mean square risk of an optimally tuned nonlocal means algorithm decays according to $n^{-1}\log^{1/2+\epsilon} n$, for an $n$-pixel image with $\epsilon>0$. This decay rate is an improvement over some of the predecessors of this algorithm, including the linear convolution filter, median filter, and the SUSAN filter, each of which provides a rate of only $n^{-2/3}$. It is also within a logarithmic factor from optimally tuned wavelet thresholding. However, it is still substantially lower than the the optimal minimax rate of $n^{-4/3}$.

[{'version': 'v1', 'created': 'Thu, 24 Nov 2011 22:43:12 GMT'}]

2011-11-28

[array(['Maleki', 'Arian', ''], dtype=object) array(['Narayan', 'Manjari', ''], dtype=object) array(['Baraniuk', 'Richard G.', ''], dtype=object)]

1912.00172

Alexander Smirnov

T. A. Soldatov, A. I. Smirnov, K. Yu. Povarov, A. Paduan-Filho and A. Zheludev

Microwave dynamics of pure and doped anisotropic S=1 chain antiferromagnet NiCl2-4SC(NH2)2

12 pages, 12 figures

Phys. Rev. B 101, 104410 (2020)

10.1103/PhysRevB.101.104410

cond-mat.str-el

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We studied electron spin resonance in a quantum magnet NiCl2-4SC(NH2)2, demonstrating a field-induced quantum phase transition from a quantum-disordered phase to an antiferromagnet. We observe two branches of the antiferromagnetic resonance of the ordered phase, one of them has a gap and the other is a Goldstone mode with zero frequency at a magnetic field along the four-fold axis. This zero frequency mode acquires a gap at a small tilting of the magnetic field with respect to this direction. The upper gap was found to be reduced in the doped compound Ni(Cl(1-x)Br(x))2-4SC(NH2)2 with $x=0.21$. This reduction is unexpected because of the previously reported rise of the main exchange constant in a doped compound. Further, a nonresonant diamagnetic susceptibility $\chi^{\prime}$ was found for the ordered phase in a wide frequency range above the quasi-Goldstone mode. This dynamic diamagnetism is as large as the dynamic susceptibility of the paramagnetic resonance. We speculate that it originates from a two-magnon absorption band of low-frequency dispersive magnon branch.

[{'version': 'v1', 'created': 'Sat, 30 Nov 2019 10:08:14 GMT'}]

2020-03-18

[array(['Soldatov', 'T. A.', ''], dtype=object) array(['Smirnov', 'A. I.', ''], dtype=object) array(['Povarov', 'K. Yu.', ''], dtype=object) array(['Paduan-Filho', 'A.', ''], dtype=object) array(['Zheludev', 'A.', ''], dtype=object)]

gr-qc/9804003

Hideki Asada

Hideki Asada

Formulation for the internal motion of quasi-equilibrium configurations in general relativity

11 pages (RevTeX); accepted for publication in Phys. Rev. D

Phys.Rev. D57 (1998) 7292-7298

10.1103/PhysRevD.57.7292

gr-qc

We present a formulation for the internal motion of equilibrium configurations with a rotational Killing vector in general relativity. As an approximation, this formulation is applicable to investigation of the internal motion of quasi-equilibrium configurations such as binary neutron stars. Based on this simple formulation, a condition for the general relativistic counter rotation has been obtained, though in the recent work by Bonazzola, Gourgoulhon and Marck, their condition for the counter rotation is not enough to specify the internal velocity field. Under the condition given in this paper, the internal velocity field can be determined completely. Indeed, in the counter-rotating case, we have also derived Poisson equations for the internal velocity, which take tractable forms in numerical implementation.

[{'version': 'v1', 'created': 'Thu, 2 Apr 1998 06:05:52 GMT'}]

2009-10-31

[array(['Asada', 'Hideki', ''], dtype=object)]

2112.04542

Raphael Cervantes

Raphael Cervantes

A Search for Wavelike Dark Matter with Dielectrically-loaded Multimode Cavities

hep-ex astro-ph.CO astro-ph.IM

http://creativecommons.org/licenses/by/4.0/

Dark matter makes up 85% of the matter in the universe and 27% of its energy density, but we don't know what comprises dark matter. There are several compelling candidates for dark matter that have wavelike properties, including axions and dark photons. Wavelike dark matter can be detected using ultra-sensitive microwave cavities. The ADMX experiment uses a cylindrical cavity operating at the fundamental mode to search for axions in the few micro-eV mass range. However, the ADMX search technique becomes increasingly challenging with increasing axion mass. This is because higher masses require smaller-diameter cavities, and a smaller cavity volume reduces the signal strength. Thus, there is interest in developing more sophisticated resonators to overcome this problem. The ADMX-Orpheus experiment uses a dielectric-loaded Fabry-Perot cavity to search for axions and dark photons with masses approaching 100 micro-eV. Orpheus maintains a large volume by operating at a higher-order mode, and the dielectrics shape the electric field so that the mode couples more strongly to the axion and dark photon. This thesis describes the development and commissioning of ADMX-Orpheus to search for dark photons with masses between 65.5 micro-eV and 69.3 micro-eV.

[{'version': 'v1', 'created': 'Wed, 8 Dec 2021 19:43:36 GMT'}]

2021-12-10

[array(['Cervantes', 'Raphael', ''], dtype=object)]

2004.03707

Matthew Turner

Matthew J. Turner, Nicholas Langellier, Rachel Bainbridge, Dan Walters, Srujan Meesala, Thomas M. Babinec, Pauli Kehayias, Amir Yacoby, Evelyn Hu, Marko Lon\v{c}ar, Ronald L. Walsworth, Edlyn V. Levine

Magnetic Field Fingerprinting of Integrated Circuit Activity with a Quantum Diamond Microscope

12 pages, 5 figures, 1 table

Phys. Rev. Applied 14, 014097 (2020)

10.1103/PhysRevApplied.14.014097

quant-ph cond-mat.mes-hall physics.app-ph physics.ins-det

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Current density distributions in active integrated circuits (ICs) result in patterns of magnetic fields that contain structural and functional information about the IC. Magnetic fields pass through standard materials used by the semiconductor industry and provide a powerful means to fingerprint IC activity for security and failure analysis applications. Here, we demonstrate high spatial resolution, wide field-of-view, vector magnetic field imaging of static (DC) magnetic field emanations from an IC in different active states using a Quantum Diamond Microscope (QDM). The QDM employs a dense layer of fluorescent nitrogen-vacancy (NV) quantum defects near the surface of a transparent diamond substrate placed on the IC to image magnetic fields. We show that QDM imaging achieves simultaneous $\sim10$ $\mu$m resolution of all three vector magnetic field components over the 3.7 mm $\times$ 3.7 mm field-of-view of the diamond. We study activity arising from spatially-dependent current flow in both intact and decapsulated field-programmable gate arrays (FPGAs); and find that QDM images can determine pre-programmed IC active states with high fidelity using machine-learning classification methods.

[{'version': 'v1', 'created': 'Tue, 7 Apr 2020 20:58:56 GMT'}]

2020-08-05

[array(['Turner', 'Matthew J.', ''], dtype=object) array(['Langellier', 'Nicholas', ''], dtype=object) array(['Bainbridge', 'Rachel', ''], dtype=object) array(['Walters', 'Dan', ''], dtype=object) array(['Meesala', 'Srujan', ''], dtype=object) array(['Babinec', 'Thomas M.', ''], dtype=object) array(['Kehayias', 'Pauli', ''], dtype=object) array(['Yacoby', 'Amir', ''], dtype=object) array(['Hu', 'Evelyn', ''], dtype=object) array(['Lončar', 'Marko', ''], dtype=object) array(['Walsworth', 'Ronald L.', ''], dtype=object) array(['Levine', 'Edlyn V.', ''], dtype=object)]

2102.10898

Andreas Schimpe

Andreas Schimpe, Simon Hoffmann and Frank Diermeyer

Adaptive Video Configuration and Bitrate Allocation for Teleoperated Vehicles

Accepted at workshop for Road Vehicle Teleoperation (WS09) at the 2021 IEEE Intelligent Vehicles Symposium (IV21)

eess.IV cs.MM

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Vehicles with autonomous driving capabilities are present on public streets. However, edge cases remain that still require a human in-vehicle driver. Assuming the vehicle manages to come to a safe state in an automated fashion, teleoperated driving technology enables a human to resolve the situation remotely by a control interface connected via a mobile network. While this is a promising solution, it also introduces technical challenges, one of them being the necessity to transmit video data of multiple cameras from the vehicle to the human operator. In this paper, an adaptive video streaming framework specifically designed for teleoperated vehicles is proposed and demonstrated. The framework enables automatic reconfiguration of the video streams of the multi-camera system at runtime. Predictions of variable transmission service quality are taken into account. With the objective to improve visual quality, the framework uses so-called rate-quality models to dynamically allocate bitrates and select resolution scaling factors. Results from deploying the proposed framework on an actual teleoperated driving system are presented.

[{'version': 'v1', 'created': 'Mon, 22 Feb 2021 11:00:47 GMT'} {'version': 'v2', 'created': 'Mon, 7 Jun 2021 20:04:41 GMT'} {'version': 'v3', 'created': 'Thu, 10 Jun 2021 14:15:36 GMT'}]

2021-06-11

[array(['Schimpe', 'Andreas', ''], dtype=object) array(['Hoffmann', 'Simon', ''], dtype=object) array(['Diermeyer', 'Frank', ''], dtype=object)]

2112.10090

Sergio Villa Cort\'es

S. Villa-Cort\'es and O. De la Pe\~na-Seaman

Superconductivity on ScH$_{3}$ and YH$_{3}$ hydrides: Effects of applied pressure in combination with electron- and hole-doping on the electron-phonon coupling properties

12 pages, 12 figures, 1 table

10.1016/j.cjph.2022.04.007

cond-mat.supr-con

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

The implementation of electron- and hole-doping, in conjunction to applied pressure, is analyzed as a mechanism to induce or enhance the superconducting state on fcc YH$_3$ and ScH$_3$. In particular, the evolution of their structural, electronic, and lattice dynamical properties, as well as the electron-phonon coupling and superconducting critical temperature ($T_c$) is presented and discussed, as a function of the electron- and hole-doping content as well as applied pressure. The study was performed within the density functional perturbation theory, taking into account the effects of zero-point energy through the quasi-harmonic approximation, while the doping was implemented by means of the construction of the Sc$_{1-x}$M$_{x}$H$_{3}$ (M=Ca,Ti) and Y$_{1-x}$M$_{x}$H$_{3}$ (M=Sr,Zr) solid solutions modeled with the virtual crystal approximation (VCA). We found that the ScH$_3$ and YH$_3$ hydrides shown a significant improvement of their electron-phonon coupling properties under hole-doping (M=Ca,Sr) and at pressure values close to dynamical instabilities. Instead, by electron-doping (M=Ti,Zr), the systems do not improve such properties, whatever value of applied pressure is considered. Then, as a result, $T_c$ rapidly increases as a function of $x$ on the hole-doping region, reaching its maximum value of $92.7(67.9)$~K and $84.5(60.2)$~K at $x=0.3$ for Sc$_{1-x}$Ca$_{x}$H$_{3}$ at $10.8$~GPa and Y$_{1-x}$Sr$_{x}$H$_{3}$ at $5.8$~GPa respectively, with $\mu^{*}=0(0.15)$, while for both, electron- and hole-doping, $T_c$ decreases as a function of the applied pressure, mainly due to phonon hardening. By the thorough analysis of the electron-phonon properties as a function of doping and pressure, we can conclude that the tuning of the lattice dynamics is a promising path for improving the superconductivity on both systems.

[{'version': 'v1', 'created': 'Sun, 19 Dec 2021 08:58:31 GMT'}]

2022-05-18

[array(['Villa-Cortés', 'S.', ''], dtype=object) array(['De la Peña-Seaman', 'O.', ''], dtype=object)]

2212.01295

Juan P. Madrid

Juan P. Madrid (The University of Texas, Rio Grande Valley)

Which countries are leading high-impact science in astronomy?

2022, Bulletin of the American Astronomical Society, Vol. 54, Issue 1

10.3847/25c2cfeb.82094b99

astro-ph.IM astro-ph.GA physics.soc-ph

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Recent news reports claim that China is overtaking the United States and all other countries in scientific productivity and scientific impact. A straightforward analysis of high-impact papers in astronomy reveals that this is not true in our field. In fact, the United States continues to host, by a large margin, the authors that lead high-impact papers. Moreover, this analysis shows that 90% of all high-impact papers in astronomy are led by authors based in North America and Europe. That is, only about 10% of countries in the world host astronomers that publish "astronomy's greatest hits".

[{'version': 'v1', 'created': 'Fri, 2 Dec 2022 16:39:38 GMT'}]

2022-12-05

[array(['Madrid', 'Juan P.', '', 'The University of Texas, Rio Grande Valley'], dtype=object)]

1212.0602

Wanxiang Feng

Wanxiang Feng and Yugui Yao

Three-dimensional topological insulators: A review on host materials

14 pages, 6 figures, 1 table

SCIENCE CHINA Physics, Mechanics & Astronomy, 55, 1 (2012)

10.1007/s11433-012-4929-9

cond-mat.mtrl-sci

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

In recent years, three-dimensional topological insulators (3DTI) as a novel state of quantum matter have become a hot topic in the fields of condensed matter physics and materials sciences. To fulfill many spectacularly novel quantum phenomena predicted in 3DTI, real host materials are of crucial importance. In this review paper, we first introduce general methods of searching for new 3DTI based on the density-functional theory. Then, we review the recent progress on materials realization of 3DTI including simple elements, binary compounds, ternary compounds, and quaternary compounds. In these potential host materials, some of them have already been confirmed by experiments while the others are not yet. The 3DTI discussed here does not contain the materials with strong electron-electron correlation. Lastly, we give a brief summary and some outlooks in further studies.

[{'version': 'v1', 'created': 'Tue, 4 Dec 2012 02:07:03 GMT'}]

2012-12-05

[array(['Feng', 'Wanxiang', ''], dtype=object) array(['Yao', 'Yugui', ''], dtype=object)]

1504.02147

Thomas Goldstein

Tom Goldstein, Gavin Taylor, Kawika Barabin, Kent Sayre

Unwrapping ADMM: Efficient Distributed Computing via Transpose Reduction

cs.DC cs.LG

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Recent approaches to distributed model fitting rely heavily on consensus ADMM, where each node solves small sub-problems using only local data. We propose iterative methods that solve {\em global} sub-problems over an entire distributed dataset. This is possible using transpose reduction strategies that allow a single node to solve least-squares over massive datasets without putting all the data in one place. This results in simple iterative methods that avoid the expensive inner loops required for consensus methods. To demonstrate the efficiency of this approach, we fit linear classifiers and sparse linear models to datasets over 5 Tb in size using a distributed implementation with over 7000 cores in far less time than previous approaches.

[{'version': 'v1', 'created': 'Wed, 8 Apr 2015 22:35:18 GMT'}]

2015-04-10

[array(['Goldstein', 'Tom', ''], dtype=object) array(['Taylor', 'Gavin', ''], dtype=object) array(['Barabin', 'Kawika', ''], dtype=object) array(['Sayre', 'Kent', ''], dtype=object)]

2103.01557

Kwan Lok Li

Kwan-Lok Li, Y. X. Jane Yap, Chung Yue Hui, Albert K. H. Kong

Revealing a New Black Widow Binary 4FGL J0336.0+7502

7 pages, including 5 figures and 2 table. Accepted for publication in ApJ

10.3847/1538-4357/abeb76

astro-ph.HE

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We report on a discovery of a promising candidate as a black widow millisecond pulsar binary, 4FGL J0336.0+7502, which shows many pulsar-like properties in the 4FGL-DR2 catalog. Within the 95% error region of the LAT source, we identified an optical counterpart with a clear periodicity at P(orb) = 3.718178(9) hours using the Bohyunsan 1.8-m Telescope, Lulin One-meter Telescope, Canada-France-Hawaii Telescope, and Gemini-North. At the optical position, an X-ray source was marginally detected in the Swift/XRT archival data, and the detection was confirmed by our Chandra/ACIS DDT observation. The spectrum of the X-ray source can be described by a power-law model of Gamma = 1.6+/-0.7 and F(0.3-7keV) = 3.5e-14 erg/cm^2/s. The X-ray photon index and the low X-ray-to-gamma-ray flux ratio (i.e., < 1%) are both consistent with that of many known black widow pulsars. There is also a hint of an X-ray orbital modulation in the Chandra data, although the significance is very low (1.3 sigma). If the pulsar identity and the X-ray modulation are confirmed, it would be the fifth black widow millisecond pulsar binary that showed an orbitally-modulated emission in X-rays.

[{'version': 'v1', 'created': 'Tue, 2 Mar 2021 08:18:33 GMT'} {'version': 'v2', 'created': 'Tue, 30 Mar 2021 05:26:08 GMT'}]

2021-04-28

[array(['Li', 'Kwan-Lok', ''], dtype=object) array(['Yap', 'Y. X. Jane', ''], dtype=object) array(['Hui', 'Chung Yue', ''], dtype=object) array(['Kong', 'Albert K. H.', ''], dtype=object)]

1809.08113

Yong Zhang

Yong Zhang, Yu Zhang, Zhao Zhang, Jie Bao, Yunpeng Song

Human activity recognition based on time series analysis using U-Net

21 pages

cs.LG cs.AI stat.ML

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Traditional human activity recognition (HAR) based on time series adopts sliding window analysis method. This method faces the multi-class window problem which mistakenly labels different classes of sampling points within a window as a class. In this paper, a HAR algorithm based on U-Net is proposed to perform activity labeling and prediction at each sampling point. The activity data of the triaxial accelerometer is mapped into an image with the single pixel column and multi-channel which is input into the U-Net network for training and recognition. Our proposal can complete the pixel-level gesture recognition function. The method does not need manual feature extraction and can effectively identify short-term behaviors in long-term activity sequences. We collected the Sanitation dataset and tested the proposed scheme with four open data sets. The experimental results show that compared with Support Vector Machine (SVM), k-Nearest Neighbor (kNN), Decision Tree(DT), Quadratic Discriminant Analysis (QDA), Convolutional Neural Network (CNN) and Fully Convolutional Networks (FCN) methods, our proposal has the highest accuracy and F1-socre in each dataset, and has stable performance and high robustness. At the same time, after the U-Net has finished training, our proposal can achieve fast enough recognition speed.

[{'version': 'v1', 'created': 'Thu, 20 Sep 2018 07:16:33 GMT'}]

2018-09-24

[array(['Zhang', 'Yong', ''], dtype=object) array(['Zhang', 'Yu', ''], dtype=object) array(['Zhang', 'Zhao', ''], dtype=object) array(['Bao', 'Jie', ''], dtype=object) array(['Song', 'Yunpeng', ''], dtype=object)]

1604.02261

Rodrigo Panosso Macedo

Marcus Ansorg, Rodrigo Panosso Macedo

Spectral decomposition of black-hole perturbations on hyperboloidal slices

Match published version

Phys. Rev. D 93, 124016 (2016)

10.1103/PhysRevD.93.124016

gr-qc

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

In this paper we present a spectral decomposition of solutions to relativistic wave equations described on horizon penetrating hyperboloidal slices within a given Schwarzschild-black-hole background. The wave equa- tion in question is Laplace-transformed which leads to a spatial differential equation with a complex parameter. For initial data which are analytic with respect to a compactified spatial coordinate, this equation is treated with the help of the Mathematica-package in terms of a sophisticated Taylor series analysis. Thereby, all ingredients of the desired spectral decomposition arise explicitly to arbitrarily prescribed accuracy, including quasi normal modes, quasi normal mode amplitudes as well as the jump of the Laplace-transform along the branch cut. Finally, all contributions are put together to obtain via the inverse Laplace transformation the spectral de- composition in question. The paper explains extensively this procedure and includes detailed discussions of relevant aspects, such as the definition of quasi normal modes and the question regarding the contribution of infinity frequencies modes to the early time response of the black hole.

[{'version': 'v1', 'created': 'Fri, 8 Apr 2016 07:53:04 GMT'} {'version': 'v2', 'created': 'Wed, 27 Jul 2016 18:37:25 GMT'}]

2016-07-28

[array(['Ansorg', 'Marcus', ''], dtype=object) array(['Macedo', 'Rodrigo Panosso', ''], dtype=object)]

1202.0242

Daniel Zinn

Daniel Zinn

Weak Forms of Monotonicity and Coordination-Freeness

Early Research Report

cs.DB cs.DC

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Our earlier work titled: "Win-move is Coordination-Free (Sometimes)" has shown that the classes of queries that can be distributedly computed in a coordination-free manner form a strict hierarchy depending on the assumptions of the model for distributed computations. In this paper, we further characterize these classes by revealing a tight relationship between them and novel weakened forms of monotonicity.

[{'version': 'v1', 'created': 'Wed, 1 Feb 2012 18:46:41 GMT'}]

2015-03-20

[array(['Zinn', 'Daniel', ''], dtype=object)]

2108.02320

Emilie Parent

E. Parent, H. Sewalls, P. C. C. Freire, T. Matheny, A. G. Lyne, B. B. P. Perera, F. Cardoso, M. A. McLaughlin, B. Allen, A. Brazier, F. Camilo, S. Chatterjee, J. M. Cordes, F. Crawford, J. S. Deneva, F. A. Dong, R. D. Ferdman, E. Fonseca, J. W. T. Hessels, V. M. Kaspi, B. Knispel, J. van Leeuwen, R. S. Lynch, B. M. Meyers, J. W. McKee, M. B. Mickaliger, C. Patel, S. M. Ransom, A. Rochon, P. Scholz, I. H. Stairs, B. W. Stappers, C. M. Tan, W. W. Zhu

Study of 72 pulsars discovered in the PALFA survey: Timing analysis, glitch activity, emission variability, and a pulsar in an eccentric binary

39 pages, 18 figures, 9 tables. Accepted for publication in ApJ

10.3847/1538-4357/ac375d

astro-ph.HE astro-ph.IM

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We present new discoveries and results from long-term timing of 72 pulsars discovered in the Arecibo PALFA survey, including precise determination of astrometric and spin parameters, and flux density and scatter broadening measurements at 1.4 GHz. Notable discoveries include two young pulsars (characteristic ages $\sim$30 kyr) with no apparent supernova remnant associations, three mode changing, 12 nulling and two intermittent pulsars. We detected eight glitches in five pulsars. Among them is PSR J1939+2609, an apparently old pulsar (characteristic age $\sim$1 Gy), and PSR J1954+2529, which likely belongs to a newly-emerging class of binary pulsars. The latter is the only pulsar among the 72 that is clearly not isolated: a non-recycled neutron star with a 931-ms spin period in an eccentric ($e\,=\,0.114$) wide ($P_b\,=\,82.7\,$d) orbit with a companion of undetermined nature having a minimum mass of $\sim0.6\,M_{\odot}$. Since operations at Arecibo ceased in 2020 August, we give a final tally of PALFA sky coverage, and compare its 207 pulsar discoveries to the known population. On average, they are 50% more distant than other Galactic plane radio pulsars; PALFA millisecond pulsars (MSP) have twice the dispersion measure per unit spin period than the known population of MSP in the Plane. The four intermittent pulsars discovered by PALFA more than double the population of such objects, which should help to improve our understanding of pulsar magnetosphere physics. The statistics for these, RRATS, and nulling pulsars suggest that there are many more of these objects in the Galaxy than was previously thought.

[{'version': 'v1', 'created': 'Thu, 5 Aug 2021 00:00:18 GMT'} {'version': 'v2', 'created': 'Fri, 6 Aug 2021 17:10:20 GMT'} {'version': 'v3', 'created': 'Wed, 17 Nov 2021 14:45:20 GMT'}]

2022-01-26

[array(['Parent', 'E.', ''], dtype=object) array(['Sewalls', 'H.', ''], dtype=object) array(['Freire', 'P. C. C.', ''], dtype=object) array(['Matheny', 'T.', ''], dtype=object) array(['Lyne', 'A. G.', ''], dtype=object) array(['Perera', 'B. B. P.', ''], dtype=object) array(['Cardoso', 'F.', ''], dtype=object) array(['McLaughlin', 'M. A.', ''], dtype=object) array(['Allen', 'B.', ''], dtype=object) array(['Brazier', 'A.', ''], dtype=object) array(['Camilo', 'F.', ''], dtype=object) array(['Chatterjee', 'S.', ''], dtype=object) array(['Cordes', 'J. M.', ''], dtype=object) array(['Crawford', 'F.', ''], dtype=object) array(['Deneva', 'J. S.', ''], dtype=object) array(['Dong', 'F. A.', ''], dtype=object) array(['Ferdman', 'R. D.', ''], dtype=object) array(['Fonseca', 'E.', ''], dtype=object) array(['Hessels', 'J. W. T.', ''], dtype=object) array(['Kaspi', 'V. M.', ''], dtype=object) array(['Knispel', 'B.', ''], dtype=object) array(['van Leeuwen', 'J.', ''], dtype=object) array(['Lynch', 'R. S.', ''], dtype=object) array(['Meyers', 'B. M.', ''], dtype=object) array(['McKee', 'J. W.', ''], dtype=object) array(['Mickaliger', 'M. B.', ''], dtype=object) array(['Patel', 'C.', ''], dtype=object) array(['Ransom', 'S. M.', ''], dtype=object) array(['Rochon', 'A.', ''], dtype=object) array(['Scholz', 'P.', ''], dtype=object) array(['Stairs', 'I. H.', ''], dtype=object) array(['Stappers', 'B. W.', ''], dtype=object) array(['Tan', 'C. M.', ''], dtype=object) array(['Zhu', 'W. W.', ''], dtype=object)]

1802.05084

Ma\"elick Claes

Ma\"elick Claes, Mika M\"antyl\"a, Miikka Kuutila, Bram Adams

Do Programmers Work at Night or During the Weekend?

40th International Conference on Software Engineering, 2018

10.1145/3180155.3180193

cs.SE

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Abnormal working hours can reduce work health, general well-being, and productivity, independent from a profession. To inform future approaches for automatic stress and overload detection, this paper establishes empirically collected measures of the work patterns of software engineers. To this aim, we perform the first large-scale study of software engineers' working hours by investigating the time stamps of commit activities of 86 large open source software projects, both containing hired and volunteer developers. We find that two thirds of software engineers mainly follow typical office hours, empirically established to be from 10h to 18h, and do not usually work during nights and weekends. Large variations between projects and individuals exist. Surprisingly, we found no support that project maturation would decrease abnormal working hours. In the Firefox case study, we found that hired developers work more during office hours while seniority, either in terms of number of commits or job status, did not impact working hours. We conclude that the use of working hours or timestamps of work products for stress detection requires establishing baselines at the level of individuals.

[{'version': 'v1', 'created': 'Wed, 14 Feb 2018 13:15:33 GMT'}]

2018-10-04

[array(['Claes', 'Maëlick', ''], dtype=object) array(['Mäntylä', 'Mika', ''], dtype=object) array(['Kuutila', 'Miikka', ''], dtype=object) array(['Adams', 'Bram', ''], dtype=object)]

1407.3810

Murray Bremner

Murray Bremner, Sara Madariaga, Luiz A. Peresi

Structure theory for the group algebra of the symmetric group, with applications to polynomial identities for the octonions

32 pages plus 2 pages of references

math.RA math.RT

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

In part 1, we review the structure theory of $\mathbb{F} S_n$, the group algebra of the symmetric group $S_n$ over a field of characteristic 0. We define the images $\psi(E^\lambda_{ij})$ of the matrix units $E^\lambda_{ij}$ ($1 \le i, j \le d_\lambda$), where $d_\lambda$ is the number of standard tableaux of shape $\lambda$, and obtain an explicit construction of Young's isomorphism $\psi\colon \bigoplus_\lambda M_{d_\lambda}(\mathbb{F}) \to \mathbb{F} S_n$. We then present Clifton's algorithm for the construction of the representation matrices $R^\lambda(p) \in M_{d_\lambda}(\mathbb{F})$ for all $p \in S_n$, and obtain the reverse isomorphism $\phi\colon \mathbb{F} S_n \to \bigoplus_\lambda M_{d_\lambda}(\mathbb{F})$. In part 2, we apply the structure theory of $\mathbb{F} S_n$ to the study of multilinear polynomial identities of degree $n \le 7$ for the algebra $\mathbb{O}$ of octonions over a field of characteristic 0. We compare our results with earlier work of Racine, Hentzel & Peresi, and Shestakov & Zhukavets on the identities of degree $n \le 6$. We use computational linear algebra to verify that every identity in degree 7 is a consequence of the known identities of lower degrees: there are no new identities in degree 7. We conjecture that the known identities of degree $\le 6$ generate all octonion identities in characteristic 0.

[{'version': 'v1', 'created': 'Mon, 14 Jul 2014 20:32:56 GMT'}]

2014-07-16

[array(['Bremner', 'Murray', ''], dtype=object) array(['Madariaga', 'Sara', ''], dtype=object) array(['Peresi', 'Luiz A.', ''], dtype=object)]

hep-th/9903151

Maciej Pindor

Maciej Pindor (Institute of Theoretical Physics, Warsaw University)

Pade Approximants and Borel Summation for QCD Perturbation Expansions

LaTeX

IFT 9809002

hep-th

We study the applicability of Pade Approximants (PA) to estimate a "sum" of asymptotic series of the type appearing in QCD. We indicate that one should not expect PA to converge for positive values of the coupling constant and propose to use PA for the Borel transform of the series. If the latter has poles on the positive semiaxis, the Borel integral does not exist, but we point out that the Cauchy pricipal value integral can exist and that it represents one of the possible "sums" of the original series, the one that is real on the positive semiaxis. We mention how this method works for Bjorken sum rule, and study in detail its application to series appearing for the running coupling constant for the Richardson static QCD potential. We also indicate that the same method should work if the Borel transform has branchpoints on the positive semiaxis and support this claim by a simple numerical experiment.

[{'version': 'v1', 'created': 'Wed, 17 Mar 1999 14:45:36 GMT'}]

2007-05-23

[array(['Pindor', 'Maciej', '', 'Institute of Theoretical Physics, Warsaw University'], dtype=object) ]

2005.10737

Andrew Bechter

Andrew J. Bechter, Jonathan Crass, Jonathan Tesch, Justin R. Crepp, Eric B. Bechter

Characterization of Single-Mode Fiber Coupling at the Large Binocular Telescope

10.1088/1538-3873/ab42cb

astro-ph.IM

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Optimizing on-sky single-mode fiber (SMF) injection is an essential part of developing precise Doppler spectrometers and new astrophotonics technologies. We installed and tested a prototype SMF injection system at the Large Binocular Telescope (LBT) in April 2016. The fiber injection unit was built as part of the de-risking process for a new instrument named iLocater that will use adaptive optics (AO) to feed a high resolution, near-infrared spectrograph. In this paper we report Y-band SMF coupling measurements for bright, M-type stars. We compare theoretical expectations for delivered Strehl ratio and SMF coupling to experimental results, and evaluate fundamental effects that limit injection efficiency. We find the pupil geometry of the telescope itself limits fiber coupling to a maximum efficiency of rho_tel=0.78. Further analysis shows the individual impact of AO correction, tip-tilt residuals, and static (non-common-path) aberrations contribute coupling coefficients of rho_Strehl=0.33, rho_tip/tilt=0.84, and rho_ncpa=0.8 respectively. Combined, these effects resulted in an average Y-band SMF efficiency of 0.18 for all observations. Finally, we investigate the impact of fiber coupling on radial velocity (RV) precision as a function of stellar apparent magnitude.

[{'version': 'v1', 'created': 'Thu, 21 May 2020 15:45:16 GMT'}]

2020-05-22

[array(['Bechter', 'Andrew J.', ''], dtype=object) array(['Crass', 'Jonathan', ''], dtype=object) array(['Tesch', 'Jonathan', ''], dtype=object) array(['Crepp', 'Justin R.', ''], dtype=object) array(['Bechter', 'Eric B.', ''], dtype=object)]

astro-ph/0606533

Masahiro Takada

Masahiro Takada (Tohoku Univ., Japan)

Can a galaxy redshift survey measure dark energy clustering?

14 pages, 7 figures; minor changes to match the published version

Phys.Rev. D74 (2006) 043505

10.1103/PhysRevD.74.043505

astro-ph

(abridged) A wide-field galaxy redshift survey allows one to probe galaxy clustering at largest spatial scales, which carries an invaluable information on horizon-scale physics complementarily to the cosmic microwave background (CMB). Assuming the planned survey consisting of z~1 and z~3 surveys with areas of 2000 and 300 square degrees, respectively, we study the prospects for probing dark energy clustering from the measured galaxy power spectrum, assuming the dynamical properties of dark energy are specified in terms of the equation of state and the effective sound speed c_e in the context of an adiabatic cold dark matter dominated model. The dark energy clustering adds a power to the galaxy power spectrum amplitude at spatial scales greater than the sound horizon, and the enhancement is sensitive to redshift evolution of the net dark energy density, i.e. the equation of state. We find that the galaxy survey, when combined with Planck, can distinguish dark energy clustering from a smooth dark energy model such as the quintessence model (c_e=1), when c_e<0.04 (0.02) in the case of the constant equation of state w_0=-0.9 (-0.95). An ultimate full-sky survey of z~1 galaxies allows the detection when c_e<0.08 (0.04) for w_0=0.9 (-0.95). We also investigate a degeneracy between the dark energy clustering and the non-relativistic neutrinos implied from the neutrino oscillation experiments, because the two effects both induce a scale-dependent modification in the galaxy power spectrum shape at largest spatial scales accessible from the galaxy survey. It is shown that a wider redshift coverage can efficiently separate the two effects by utilizing the different redshift dependences, where dark energy clustering is apparent only at low redshifts z<1.

[{'version': 'v1', 'created': 'Wed, 21 Jun 2006 20:55:45 GMT'} {'version': 'v2', 'created': 'Fri, 23 Jun 2006 06:34:52 GMT'} {'version': 'v3', 'created': 'Fri, 14 Jul 2006 21:28:57 GMT'} {'version': 'v4', 'created': 'Wed, 23 Aug 2006 18:01:17 GMT'}]

2009-11-11

[array(['Takada', 'Masahiro', '', 'Tohoku Univ., Japan'], dtype=object)]

astro-ph/0205030

Dr. Michael T. Wolff

M. T. Wolff, P. Hertz, K. S. Wood, P. S. Ray, R. M. Bandyopadhyay

Eclipse Timings of the Low Mass X-ray Binary EXO0748-676 III. An Apparent Orbital Period Glitch Observed with USA and RXTE

38 Pages, 9 Figures, 3 Tables

astro-ph

We present 7 eclipse timings of the low mass X-ray binary EXO0748-676 obtained with the USA experiment during 1999-2000 as well as 122 eclipse timings obtained with RXTE during 1996-2000. According to our analysis, the mean orbital period has increased by ~8 ms between the pre-RXTE era (1985-1990) and the RXTE/USA era (1996-2000). This corresponds to an orbital period derivative of P(orb)/(dP(orb)/dt)~2x10^7 years. However, neither a constant orbital period derivative nor any other simple ephemeris provides an acceptable fit to the data: individual timings of eclipse centers have residuals of up to 15 or more seconds away from our derived smooth ephemerides. When we consider all published eclipse timing data including those presented here, a model that includes observational measurement error, cumulative period jitter, and underlying period evolution is found to be consistent with the timing data. We discuss several physical mechanisms for LMXB orbital evolution in an effort to account for the change in orbital period and the observed intrinsic jitter in the mid-eclipse times.

[{'version': 'v1', 'created': 'Thu, 2 May 2002 21:55:02 GMT'}]

2007-05-23

[array(['Wolff', 'M. T.', ''], dtype=object) array(['Hertz', 'P.', ''], dtype=object) array(['Wood', 'K. S.', ''], dtype=object) array(['Ray', 'P. S.', ''], dtype=object) array(['Bandyopadhyay', 'R. M.', ''], dtype=object)]

1403.5581

Chengxing Zhai

Alice R. Zhai and Jonathan H. Jiang

Dependency of U.S. Hurricane Economic Loss on Maximum Wind Speed and Storm Size

24 pages,7 figures

10.1088/1748-9326/9/6/064019

physics.ao-ph

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Many empirical hurricane economic loss models consider only wind speed and neglect storm size. These models may be inadequate in accurately predicting the losses of super-sized storms, such as Hurricane Sandy in 2012. In this study, we examined the dependencies of normalized U.S. hurricane loss on both wind speed and storm size for 73 tropical cyclones that made landfall in the U.S. from 1988 to 2012. A multi-variate least squares regression is used to construct a hurricane loss model using both wind speed and size as predictors. Using maximum wind speed and size together captures more variance of losses than using wind speed or size alone. It is found that normalized hurricane loss (L) approximately follows a power law relation with maximum wind speed (Vmax) and size (R). Assuming L=10^c Vmax^a R^b, c being a scaling factor, the coefficients, a and b, generally range between 4-12 and 2-4, respectively. Both a and b tend to increase with stronger wind speed. For large losses, a weighted regression model, with a being 4.28 and b being 2.52, produces a reasonable fitting to the actual losses. Hurricane Sandy's size was about 3.4 times of the average size of the 73 storms analyzed. Based on the weighted regression model, Hurricane Sandy's loss would be 21 times smaller if its size were of the average size with maximum wind speed unchanged. It is important to revise conventional empirical hurricane loss models to include both maximum wind speed and size as predictors.

[{'version': 'v1', 'created': 'Fri, 21 Mar 2014 22:07:57 GMT'}]

2015-06-19

[array(['Zhai', 'Alice R.', ''], dtype=object) array(['Jiang', 'Jonathan H.', ''], dtype=object)]

math/0112273

George Androulakis

George Androulakis, Thomas Schlumprecht

The Banach space S is complementably minimal and subsequentially prime

See also: http://www.math.sc.edu/~giorgis/research.html

math.FA

We first include a result of the second author showing that the Banach space S is complementably minimal. We then show that every block sequence of the unit vector basis of S has a subsequence which spans a space isomorphic to its square. By the Pe{\l}czy\'nski decomposition method it follows that every basic sequence in S which spans a space complemented in S has a subsequence which spans a space isomorphic to S (i.e. S is a subsequentially prime space).

[{'version': 'v1', 'created': 'Tue, 25 Dec 2001 05:36:02 GMT'}]

2007-05-23

[array(['Androulakis', 'George', ''], dtype=object) array(['Schlumprecht', 'Thomas', ''], dtype=object)]

1807.02532

Sarah Rees

Sarah Rees and Derek Holt

Biautomatic structures in systolic Artin groups

math.GR

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We examine the construction of Huang and Osajda that was used in their proof of the biautomaticity of Artin groups of almost large type. We describe a slightly simpler variant of that biautomatic structure, with explicit descriptions of a few small examples, and we examine some of the properties of the structure. We explain how the construction can be programmed within the GAP system.

[{'version': 'v1', 'created': 'Fri, 6 Jul 2018 18:03:47 GMT'}]

2018-07-10

[array(['Rees', 'Sarah', ''], dtype=object) array(['Holt', 'Derek', ''], dtype=object)]

1711.09447

Marina Gonchenko

M. Gonchenko, S.V. Gonchenko, I. Ovsyannikov, and A. Vieiro

On local and global aspects of the 1:4 resonance in the conservative cubic H\'enon maps

21 pages, 13 figures

10.1063/1.5022764

math.DS

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We study the 1:4 resonance for the conservative cubic H\'enon maps $\mathbf{C}_\pm$ with positive and negative cubic term. These maps show up different bifurcation structures both for fixed points with eigenvalues $\pm i$ and for 4-periodic orbits. While for $\mathbf{C}_-$ the 1:4 resonance unfolding has the so-called Arnold degeneracy (the first Birkhoff twist coefficient equals (in absolute value) to the first resonant term coefficient), the map $\mathbf{C}_+$ has a different type of degeneracy because the resonant term can vanish. In the last case, non-symmetric points are created and destroyed at pitchfork bifurcations and, as a result of global bifurcations, the 1:4 resonant chain of islands rotates by $\pi/4$. For both maps several bifurcations are detected and illustrated.

[{'version': 'v1', 'created': 'Sun, 26 Nov 2017 20:03:31 GMT'}]

2018-05-23

[array(['Gonchenko', 'M.', ''], dtype=object) array(['Gonchenko', 'S. V.', ''], dtype=object) array(['Ovsyannikov', 'I.', ''], dtype=object) array(['Vieiro', 'A.', ''], dtype=object)]

1101.5048

Atieh Mirshahvalad

Atieh Mirshahvalad and Martin Rosvall

Reinforced communication and social navigation: remember your friends and remember yourself

6 pages, 6 Figures

10.1103/PhysRevE.84.036102

physics.soc-ph cs.SI

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

In social systems, people communicate with each other and form groups based on their interests. The pattern of interactions, the network, and the ideas that flow on the network naturally evolve together. Researchers use simple models to capture the feedback between changing network patterns and ideas on the network, but little is understood about the role of past events in the feedback process. Here we introduce a simple agent-based model to study the coupling between peoples' ideas and social networks, and better understand the role of history in dynamic social networks. We measure how information about ideas can be recovered from information about network structure and, the other way around, how information about network structure can be recovered from information about ideas. We find that it is in general easier to recover ideas from the network structure than vice versa.

[{'version': 'v1', 'created': 'Wed, 26 Jan 2011 13:04:25 GMT'}]

2015-03-18

[array(['Mirshahvalad', 'Atieh', ''], dtype=object) array(['Rosvall', 'Martin', ''], dtype=object)]

1204.4942

Spela Spenko

M. Bre\v{s}ar, B. Magajna, \v{S}. \v{S}penko

Identifying derivations through the spectra of their values

12 pages

math.OA math.FA math.SP

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We consider the relationship between derivations $d$ and $g$ of a Banach algebra $B$ that satisfy $\s(g(x)) \subseteq \s(d(x))$ for every $x\in B$, where $\s(\, . \,)$ stands for the spectrum. It turns out that in some basic situations, say if $B=B(X)$, the only possibilities are that $g=d$, $g=0$, and, if $d$ is an inner derivation implemented by an algebraic element of degree 2, also $g=-d$. The conclusions in more complex classes of algebras are not so simple, but are of a similar spirit. A rather definitive result is obtained for von Neumann algebras. In general $C^*$-algebras we have to make some adjustments, in particular we restrict our attention to inner derivations implemented by selfadjoint elements. We also consider a related condition $\|[b,x]\|\leq M\|[a,x]\|$ for all selfadjoint elements $x$ from a $C^*$-algebra $B$, where $a,b\in B$ and $a$ is normal.

[{'version': 'v1', 'created': 'Sun, 22 Apr 2012 21:43:43 GMT'}]

2012-04-24

[array(['Brešar', 'M.', ''], dtype=object) array(['Magajna', 'B.', ''], dtype=object) array(['Špenko', 'Š.', ''], dtype=object)]

1401.6904

Hanlei Wang

Hanlei Wang

Adaptive Visual Tracking for Robotic Systems Without Image-Space Velocity Measurement

21 pages, 3 figures, revised for making improvements based on the reviewers' and AE's comments from Automatica and for adding the journal reference

Automatica, 55: 294-301, May 2015

10.1016/j.automatica.2015.02.029

cs.RO cs.SY math.OC

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

In this paper, we investigate the visual tracking problem for robotic systems without image-space velocity measurement, simultaneously taking into account the uncertainties of the camera model and the manipulator kinematics and dynamics. We propose a new image-space observer that exploits the image-space velocity information contained in the unknown kinematics, upon which, we design an adaptive controller without using the image-space velocity signal where the adaptations of the depth-rate-independent kinematic parameter and depth parameter are driven by both the image-space tracking errors and observation errors. The major superiority of the proposed observer-based adaptive controller lies in its simplicity and the separation of the handling of multiple uncertainties in visually servoed robotic systems, thus avoiding the overparametrization problem of the existing work. Using Lyapunov analysis, we demonstrate that the image-space tracking errors converge to zero asymptotically. The performance of the proposed adaptive control scheme is illustrated by a numerical simulation.

[{'version': 'v1', 'created': 'Mon, 27 Jan 2014 15:56:28 GMT'} {'version': 'v2', 'created': 'Sat, 12 Apr 2014 11:22:39 GMT'} {'version': 'v3', 'created': 'Mon, 27 Apr 2015 18:42:55 GMT'}]

2015-06-15

[array(['Wang', 'Hanlei', ''], dtype=object)]

1704.02130

C\'edric Bamps

C\'edric Bamps, Serge Massar, Stefano Pironio

Device-independent randomness generation with sublinear shared quantum resources

8+6 pages, version accepted in Quantum

Quantum 2, 86 (2018)

10.22331/q-2018-08-22-86

quant-ph

http://creativecommons.org/licenses/by/4.0/

In quantum cryptography, device-independent (DI) protocols can be certified secure without requiring assumptions about the inner workings of the devices used to perform the protocol. In order to display nonlocality, which is an essential feature in DI protocols, the device must consist of at least two separate components sharing entanglement. This raises a fundamental question: how much entanglement is needed to run such DI protocols? We present a two-device protocol for DI random number generation (DIRNG) which produces approximately $n$ bits of randomness starting from $n$ pairs of arbitrarily weakly entangled qubits. We also consider a variant of the protocol where $m$ singlet states are diluted into $n$ partially entangled states before performing the first protocol, and show that the number $m$ of singlet states need only scale sublinearly with the number $n$ of random bits produced. Operationally, this leads to a DIRNG protocol between distant laboratories that requires only a sublinear amount of quantum communication to prepare the devices.

[{'version': 'v1', 'created': 'Fri, 7 Apr 2017 08:33:33 GMT'} {'version': 'v2', 'created': 'Mon, 28 Aug 2017 15:28:18 GMT'} {'version': 'v3', 'created': 'Sat, 23 Jun 2018 18:23:10 GMT'}]

2018-08-23

[array(['Bamps', 'Cédric', ''], dtype=object) array(['Massar', 'Serge', ''], dtype=object) array(['Pironio', 'Stefano', ''], dtype=object)]

1305.3041

Magnus Find

Joan Boyar, Magnus Find

Cancellation-Free Circuits in Unbounded and Bounded Depth

IMADA-preprint 2013. This article supersedes arXiv:1207.5321. The publication is available from ScienceDirect

10.1016/j.tcs.2014.10.014

cs.CC

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We study the notion of "cancellation-free" circuits. This is a restriction of linear Boolean circuits (XOR circuits), but can be considered as being equivalent to previously studied models of computation. The notion was coined by Boyar and Peralta in a study of heuristics for a particular circuit minimization problem. They asked how large a gap there can be between the smallest cancellation-free circuit and the smallest linear circuit. We show that the difference can be a factor $\Omega(n/\log^{2}n)$. This improves on a recent result by Sergeev and Gashkov who have studied a similar problem. Furthermore, our proof holds for circuits of constant depth. We also study the complexity of computing the Sierpinski matrix using cancellation-free circuits and give a tight $\Omega(n\log n)$ lower bound.

[{'version': 'v1', 'created': 'Tue, 14 May 2013 07:13:03 GMT'} {'version': 'v2', 'created': 'Fri, 17 Oct 2014 07:28:23 GMT'}]

2014-10-20

[array(['Boyar', 'Joan', ''], dtype=object) array(['Find', 'Magnus', ''], dtype=object)]

1809.08109

Peixiang Lu

Liang Li, Pengfei Lan, Xiaosong Zhu, Tengfei Huang, Qingbin Zhang, Manfred Lein, and Peixiang Lu

Reciprocal-space-trajectory perspective on high harmonic generation in solids

arXiv admin note: text overlap with arXiv:1805.12370

Phys. Rev. Lett. 122, 193901 (2019)

10.1103/PhysRevLett.122.193901

physics.optics

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We revisit the mechanism of high harmonic generation (HHG) from solids by comparing HHG in laser fields with different ellipticities but constant maximum amplitude. It is shown that the cutoff of HHG is strongly extended in a circularly polarized field. Moreover, the harmonic yield with large ellipticity is comparable to or even higher than that in the linearly polarized field. To understand the underlying physics, we develop a reciprocal-space-trajectory method, which explains HHG in solids by a trajectory ensemble from different ionization times and different initial states in the reciprocal space. We show that the cutoff extension is related to an additional pre-acceleration step prior to ionization, which has been overlooked in solids. By analyzing the trajectories and the time-frequency spectrogram, we show that the HHG in solids cannot be interpreted in terms of the classical re-collision picture alone. Instead, the radiation should be described by the electronhole interband polarization, which leads to the unusual ellipticity dependence. We propose a new four-step model to understand the mechanism of HHG in solids.

[{'version': 'v1', 'created': 'Thu, 20 Sep 2018 02:22:21 GMT'} {'version': 'v2', 'created': 'Thu, 18 Apr 2019 07:11:37 GMT'}]

2019-05-22

[array(['Li', 'Liang', ''], dtype=object) array(['Lan', 'Pengfei', ''], dtype=object) array(['Zhu', 'Xiaosong', ''], dtype=object) array(['Huang', 'Tengfei', ''], dtype=object) array(['Zhang', 'Qingbin', ''], dtype=object) array(['Lein', 'Manfred', ''], dtype=object) array(['Lu', 'Peixiang', ''], dtype=object)]

1306.0925

Joydip Ghosh

Joydip Ghosh, Austin G. Fowler, John M. Martinis, and Michael R. Geller

Understanding the effects of leakage in superconducting quantum error detection circuits

8 pages, 4 figures. Accepted in Phys. Rev. A

Physical Review A 88, 062329 (2013)

10.1103/PhysRevA.88.062329

quant-ph

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

The majority of quantum error detection and correction protocols assume that the population in a qubit does not leak outside of its computational subspace. For many existing approaches, however, the physical qubits do possess more than two energy levels and consequently are prone to such leakage events. Analyzing the effects of leakage is therefore essential to devise optimal protocols for quantum gates, measurement, and error correction. In this work, we present a detailed study of leakage in a two-qubit superconducting stabilizer measurement circuit. We simulate the repeated ancilla-assisted measurement of a single $\sigma^z$ operator for a data qubit, record the outcome at the end of each measurement cycle, and explore the signature of leakage events in the obtained readout statistics. An analytic model is also developed that closely approximates the results of our numerical simulations. We find that leakage leads to destructive features in the quantum error detection scheme, making additional hardware and software protocols necessary.

[{'version': 'v1', 'created': 'Tue, 4 Jun 2013 20:44:40 GMT'} {'version': 'v2', 'created': 'Wed, 11 Dec 2013 22:00:14 GMT'}]

2013-12-24

[array(['Ghosh', 'Joydip', ''], dtype=object) array(['Fowler', 'Austin G.', ''], dtype=object) array(['Martinis', 'John M.', ''], dtype=object) array(['Geller', 'Michael R.', ''], dtype=object)]

1501.02067

Arindam Sarkar

Arindam Sarkar, C.L. Linslal, V. P. N. Nampoori

Spectral modification of mode structures in silver nanoparticle doped Rhodamine 6G

13 pages, 15 figues, journal submitted paper, with minor additions

Optics and Laser Technology 75(2015) 182-187

10.1016/j.optlastec.2015.07.004

physics.optics

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We show in our work that very narrow (FSR~0.09 nm) lasing modes can be formed from rhodamine 6G solution confined within quartz (SiO2) cuvette with suitable pumping scheme by Q switched Nd:YAG laser. With introduction of silver nanoparticles of different concentrations in rhodamine 6G we show that such lasing modes can be modulated as well as tuned in intensity, band spacing and emission wavelength. We also show that this system maintains a very high Q value > 6.4*1000 irrespective to change in other parameters.

[{'version': 'v1', 'created': 'Fri, 9 Jan 2015 08:52:13 GMT'} {'version': 'v2', 'created': 'Mon, 22 Jun 2015 09:23:49 GMT'}]

2015-07-22

[array(['Sarkar', 'Arindam', ''], dtype=object) array(['Linslal', 'C. L.', ''], dtype=object) array(['Nampoori', 'V. P. N.', ''], dtype=object)]

1912.06260

Hayden Taylor

Soochan Chung, Kristyn Kadala, Hayden Taylor

Enhancement of Water Repellence by Hierarchical Surface Structures Integrating Micro-dome and Micro-pillar Arrays with Nanoporous Coatings

physics.app-ph

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Superhydrophobic surfaces with multi-scale topographies offer exceptionally high apparent water contact angles and low contact angle hysteresis by virtue of the small liquid{\textendash}solid contact fractions they enable. Natural water-repellent surfaces such as lotus leaves often feature dome-shaped micro-scale protrusions, whose lack of sharp edges also facilitates smooth droplet shedding without pinning. Engineered hydrophobic surfaces, however, have not yet fully exploited the merits of protrusions with controlled curvature. In this work, thermal re-flow of photoresist patterns followed by elastomeric casting was used to fabricate arrays of micro-domes with sizes 20{\textendash}50 {\mu}m. These microstructures were coated with a nanoporous zinc oxide film and fluorosilanized to produce hierarchical surface topographies with static water contact angles up to 169.7{\pm}0.4{\deg} and contact angle hysteresis as low as 14.7{\pm}1.3{\deg}. Performance of the micro-dome arrays significantly exceeded that of arrays of sharp-edged square pillars and flat surfaces coated with the same nanoporous film. The highest performance came from the smallest micro-domes (20 {\mu}m) and closest spacings (10 {\mu}m) investigated. For larger features, contact angles reduced and hysteresis increased {\textemdash} unexpected trends not explained by contact fraction alone. This simple fabrication technique could be adapted to manufacture large surfaces for droplet shedding, including in heat transfer applications.

[{'version': 'v1', 'created': 'Thu, 12 Dec 2019 23:15:12 GMT'}]

2019-12-16

[array(['Chung', 'Soochan', ''], dtype=object) array(['Kadala', 'Kristyn', ''], dtype=object) array(['Taylor', 'Hayden', ''], dtype=object)]

2105.02136

Zo\"is Moitier

Camille Carvalho, Arnold D. Kim, Lori Lewis, Zo\"is Moitier

Quadrature by Parity Asymptotic eXpansions (QPAX) for scattering by high aspect ratio particles

SIAM Multiscale Modeling & Simulation 2021

10.1137/21M1416801

math.NA cs.NA

http://creativecommons.org/licenses/by/4.0/

We study scattering by a high aspect ratio particle using boundary integral equation methods. This problem has important applications in nanophotonics problems, including sensing and plasmonic imaging. To illustrate the effect of parity and the need for adapted methods in presence of high aspect ratio particles, we consider the scattering in two dimensions by a sound-hard, high aspect ratio ellipse. This fundamental problem highlights the main challenge and provide valuable insights to tackle plasmonic problems and general high aspect ratio particles. For this problem, we find that the boundary integral operator is nearly singular due to the collapsing geometry from an ellipse to a line segment. We show that this nearly singular behavior leads to qualitatively different asymptotic behaviors for solutions with different parities. Without explicitly taking this nearly singular behavior and this parity into account, computed solutions incur a large error. To address these challenges, we introduce a new method called Quadrature by Parity Asymptotic eXpansions (QPAX) that effectively and efficiently addresses these issues. We first develop QPAX to solve the Dirichlet problem for Laplace's equation in a high aspect ratio ellipse. Then, we extend QPAX for scattering by a sound-hard, high aspect ratio ellipse. We demonstrate the effectiveness of QPAX through several numerical examples.

[{'version': 'v1', 'created': 'Wed, 5 May 2021 15:39:28 GMT'} {'version': 'v2', 'created': 'Tue, 7 Sep 2021 16:59:51 GMT'}]

2022-04-21

[array(['Carvalho', 'Camille', ''], dtype=object) array(['Kim', 'Arnold D.', ''], dtype=object) array(['Lewis', 'Lori', ''], dtype=object) array(['Moitier', 'Zoïs', ''], dtype=object)]

1911.03857

Jie-Qiao Liao

Fen Zou, Xiao-Ya Zhang, Xun-Wei Xu, Jin-Feng Huang, Jie-Qiao Liao

Multiphoton blockade in the two-photon Jaynes-Cummings model

15 pages, 9 figures

Phys. Rev. A 102, 053710 (2020)

10.1103/PhysRevA.102.053710

quant-ph

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We study multiphoton blockade and photon-induced tunneling effects in the two-photon Jaynes-Cummings model, where a single-mode cavity field and a two-level atom are coupled via a two-photon interaction. We consider both the cavity-field-driving and atom-driving cases, and find that single-photon blockade and photon-induced tunneling effects can be observed when the cavity mode is driven, while the two-photon blockade effect appears when the atom is driven. For the atom-driving case (the two-photon transition process), we present a criterion of the correlation functions for the multiphoton blockade effect. Specifically, we show that quantum interference can enhance the photon blockade effect in the single-photon cavity-field-driving case. Our results are confirmed by analytically and numerically calculating the correlation function of the cavity-field mode. Our work has potential applications in quantum information processing and paves the way for the study of multiphoton quantum coherent devices.

[{'version': 'v1', 'created': 'Sun, 10 Nov 2019 05:44:54 GMT'} {'version': 'v2', 'created': 'Wed, 11 Nov 2020 11:12:01 GMT'}]

2020-11-12

[array(['Zou', 'Fen', ''], dtype=object) array(['Zhang', 'Xiao-Ya', ''], dtype=object) array(['Xu', 'Xun-Wei', ''], dtype=object) array(['Huang', 'Jin-Feng', ''], dtype=object) array(['Liao', 'Jie-Qiao', ''], dtype=object)]

0903.2773

Laura Anderson

Laura Anderson

Homotopy sphere representations for matroids

math.CO

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

For any rank $r$ oriented matroid $M$, a construction is given of a "topological representation" of $M$ by an arrangement of homotopy spheres in a simplicial complex which is homotopy equivalent to $S^{r-1}$. The construction is completely explicit and depends only on a choice of maximal flag in $M$. If $M$ is orientable, then all Folkman-Lawrence representations of all orientations of $M$ embed in this representation in a homotopically nice way.

[{'version': 'v1', 'created': 'Mon, 16 Mar 2009 15:22:43 GMT'}]

2009-03-17

[array(['Anderson', 'Laura', ''], dtype=object)]

2110.12457

Stavros Venikoudis

F.P. Fronimos (Aristotle U., Thessaloniki), S.A. Venikoudis (Aristotle U., Thessaloniki)

Inflation with exotic kinetic terms in Einstein-Chern-Simons gravity

Accepted in International Journal of Modern Physics A. arXiv admin note: text overlap with arXiv:2107.09457

10.1142/S0217751X21502298

gr-qc astro-ph.CO hep-th

http://creativecommons.org/licenses/by/4.0/

An alternative scenario about the phenomenology of primordial Universe is k-inflation. According to this concept, inflation can be achieved by nonstandard kinetic term of scalar field, namely the inflaton. In this project we focus on k-essence models in the presence of a higher order and a linear kinetic term. Furthermore, the inflationary phenomenology with a Dirac-Born-Infeld scalar field is briefly examined, which arises from quantum theories of gravity such as superstring theory. Our approach about the inflationary era is that it can be described in the context of Einstein's gravity involving quantum corrections such as the Chern-Simons string inspired parity violating gravitational term. The equations of motion namely, the Friedmann equation, the Raychadhuri equation and the Klein-Gordon equation for an expanding background are extracted from the gravitational action utilizing the variational principle. The consequential system of differential equations with respect to Hubble's parameter and the inflaton field was quite perplexed in order to be solved with an analytic way. Therefore, the slow-roll conditions during inflationary era were imposed and terms with minor numerically contribution were neglected. From the overall phenomenological analysis it is proved that, models with exotic kinetic terms can generate viable results in consistency with the latest Planck data. Finally, the presence of Chern-Simons quantum corrections shifts the primordial spectral tensor index to blue. Even though blue gravitational waves have yet to be observed, if detected, compatibility with the aforementioned theory can be achieved.

[{'version': 'v1', 'created': 'Sun, 24 Oct 2021 14:44:00 GMT'}]

2021-12-01

[array(['Fronimos', 'F. P.', '', 'Aristotle U., Thessaloniki'], dtype=object) array(['Venikoudis', 'S. A.', '', 'Aristotle\n U., Thessaloniki'], dtype=object) ]

2306.03591

Haigang Li

Haigang Li, Longjuan Xu, Peihao Zhang

Stress blow-up analysis when suspending rigid particles approach boundary in 3D Stokes flow

33 pages

math.AP

http://creativecommons.org/publicdomain/zero/1.0/

The stress concentration is a common phenomenon in the study of fluid-solid model. In this paper, we investigate the boundary gradient estimates and the second order derivatives estimates for the Stokes flow when the rigid particles approach the boundary of the matrix in dimension three. We classify the effect on the blow-up rates of the stress from the prescribed various boundary data: locally constant case and locally polynomial case. Our results hold for general convex inclusions, including two important cases in practice, spherical inclusions and ellipsoidal inclusions. The blow-up rates of the Cauchy stress in the narrow region are also obtained. We establish the corresponding estimates in higher dimensions greater than three.

[{'version': 'v1', 'created': 'Tue, 6 Jun 2023 11:28:32 GMT'}]

2023-06-07

[array(['Li', 'Haigang', ''], dtype=object) array(['Xu', 'Longjuan', ''], dtype=object) array(['Zhang', 'Peihao', ''], dtype=object)]

math/0212300

Biskup Marek

Marek Biskup, Lincoln Chayes, Roman Kotecky

Critical region for droplet formation in the two-dimensional Ising model

48 pages, 2 figures, version to appear in Commun. Math. Phys

Commun. Math. Phys. 242 (2003), no. 1-2, 137--183

10.1007/s00220-003-0946-x

math.PR cond-mat.stat-mech math-ph math.MP physics.chem-ph

We study the formation/dissolution of equilibrium droplets in finite systems at parameters corresponding to phase coexistence. Specifically, we consider the 2D Ising model in volumes of size $L^2$, inverse temperature $\beta>\betac$ and overall magnetization conditioned to take the value $\mstar L^2-2\mstar v_L$, where $\betac^{-1}$ is the critical temperature, $\mstar=\mstar(\beta)$ is the spontaneous magnetization and $v_L$ is a sequence of positive numbers. We find that the critical scaling for droplet formation/dissolution is when $v_L^{3/2} L^{-2}$ tends to a definite limit. Specifically, we identify a dimensionless parameter $\Delta$, proportional to this limit, a non-trivial critical value $\Deltac$ and a function $\lambda_\Delta$ such that the following holds: For $\Delta<\Deltac$, there are no droplets beyond $\log L$ scale, while for $\Delta>\Deltac$, there is a single, Wulff-shaped droplet containing a fraction $\lambda_\Delta\ge\lamc=2/3$ of the magnetization deficit and there are no other droplets beyond the scale of $\log L$. Moreover, $\lambda_\Delta$ and $\Delta$ are related via a universal equation that apparently is independent of the details of the system.

[{'version': 'v1', 'created': 'Sat, 21 Dec 2002 02:46:50 GMT'} {'version': 'v2', 'created': 'Tue, 30 Sep 2003 20:32:22 GMT'}]

2007-05-23

[array(['Biskup', 'Marek', ''], dtype=object) array(['Chayes', 'Lincoln', ''], dtype=object) array(['Kotecky', 'Roman', ''], dtype=object)]

1412.0214

Peter Jorgensen

Peter Jorgensen

Torsion classes and t-structures in higher homological algebra

19 pages. Final accepted version to appear in International Mathematics Research Notices

math.RT

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Higher homological algebra was introduced by Iyama. It is also known as $n$-homological algebra where $n \geq 2$ is a fixed integer, and it deals with $n$-cluster tilting subcategories of abelian categories. All short exact sequences in such a subcategory are split, but it has nice exact sequences with $n+2$ objects. This was recently formalised by Jasso in the theory of $n$-abelian categories. There is also a derived version of $n$-homological algebra, formalised by Geiss, Keller, and Oppermann in the theory of $( n+2 )$-angulated categories (the reason for the shift from $n$ to $n+2$ is that angulated categories have triangulated categories as the "base case"). We introduce torsion classes and t-structures into the theory of $n$-abelian and $( n+2 )$-angulated categories, and prove several results to motivate the definitions. Most of the results concern the $n$-abelian and $( n+2 )$-angulated categories ${\mathcal M}( \Lambda )$ and ${\mathcal C}( \Lambda )$ associated to an $n$-representation finite algebra $\Lambda$, as defined by Iyama and Oppermann. We characterise torsion classes in these categories in terms of closure under higher extensions, and give a bijection between torsion classes in ${\mathcal M}( \Lambda )$ and intermediate t-structures in ${\mathcal C}( \Lambda )$ which is a category one can reasonably view as the $n$-derived category of ${\mathcal M}( \Lambda )$. We hint at the link to $n$-homological tilting theory.

[{'version': 'v1', 'created': 'Sun, 30 Nov 2014 13:01:16 GMT'} {'version': 'v2', 'created': 'Mon, 19 Jan 2015 14:32:25 GMT'} {'version': 'v3', 'created': 'Tue, 11 Aug 2015 21:14:04 GMT'}]

2015-08-13

[array(['Jorgensen', 'Peter', ''], dtype=object)]

cs/0404049

Stergos Afantenos

Stergos D. Afantenos, Irene Doura, Eleni Kapellou, and Vangelis Karkaletsis

Exploiting Cross-Document Relations for Multi-document Evolving Summarization

10 pages

Methods and Applications of Artificial Intelligence, Volume 3025 of Lecture Notes in Computer Science. Springer-Verlag Heidelberg 2004. pp 410-419.

cs.CL cs.AI

This paper presents a methodology for summarization from multiple documents which are about a specific topic. It is based on the specification and identification of the cross-document relations that occur among textual elements within those documents. Our methodology involves the specification of the topic-specific entities, the messages conveyed for the specific entities by certain textual elements and the specification of the relations that can hold among these messages. The above resources are necessary for setting up a specific topic for our query-based summarization approach which uses these resources to identify the query-specific messages within the documents and the query-specific relations that connect these messages across documents.

[{'version': 'v1', 'created': 'Fri, 23 Apr 2004 10:44:24 GMT'}]

2016-08-31

[array(['Afantenos', 'Stergos D.', ''], dtype=object) array(['Doura', 'Irene', ''], dtype=object) array(['Kapellou', 'Eleni', ''], dtype=object) array(['Karkaletsis', 'Vangelis', ''], dtype=object)]

0811.2768

Avraham Aizenbud

Avraham Aizenbud

A partial analog of integrability theorem for distributions on p-adic spaces and applications

18 pages

math.RT

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Let X be a smooth real algebraic variety. Let $\xi$ be a distribution on it. One can define the singular support of $\xi$ to be the singular support of the $D_X$-module generated by $\xi$ (some times it is also called the characteristic variety). A powerful property of the singular support is that it is a coisotropic subvariety of $T^*X$. This is the integrability theorem (see [KKS, Mal, Gab]). This theorem turned out to be useful in representation theory of real reductive groups (see e.g. [AG_AMOT, AS, Say]). The aim of this paper is to give an analog of this theorem to the non-Archimedean case. The theory of D-modules is not available to us so we need a different definition of the singular support. We use the notion wave front set from [Hef] and define the singular support to be its Zariski closure. Then we prove that the singular support satisfies some property that we call weakly coisotropic, which is weaker than being coisotropic but is enough for some applications. We also prove some other properties of the singular support that were trivial in the Archimedean case (using the algebraic definition) but not obvious in the non-Archimedean case.

[{'version': 'v1', 'created': 'Mon, 17 Nov 2008 18:19:39 GMT'}]

2008-11-18

[array(['Aizenbud', 'Avraham', ''], dtype=object)]

2006.13038

Stefan Tappe

Stefan Tappe

The dual Yamada-Watanabe theorem for mild solutions to stochastic partial differential equations

18 pages. arXiv admin note: text overlap with arXiv:1907.01431

Theory of Probability and Mathematical Statistics 105:51-68, 2021

math.PR math.FA

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We provide the dual result of the Yamada-Watanabe theorem for mild solutions to semilinear stochastic partial differential equations with path-dependent coefficients. An essential tool is the so-called "method of the moving frame", which allows us to reduce the proof to infinite dimensional stochastic differential equations.

[{'version': 'v1', 'created': 'Mon, 22 Jun 2020 07:33:08 GMT'} {'version': 'v2', 'created': 'Tue, 29 Dec 2020 14:41:22 GMT'} {'version': 'v3', 'created': 'Tue, 16 Mar 2021 15:28:34 GMT'} {'version': 'v4', 'created': 'Mon, 12 Jul 2021 07:38:59 GMT'}]

2021-12-16

[array(['Tappe', 'Stefan', ''], dtype=object)]

2203.09496

Anders Martinsson

Anders Martinsson

Optimal schemes for combinatorial query problems with integer feedback

31 pages, no figures

math.CO cs.IT math.IT

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

A query game is a pair of a set $Q$ of queries and a set $\mathcal{F}$ of functions, or codewords $f:Q\rightarrow \mathbb{Z}.$ We think of this as a two-player game. One player, Codemaker, picks a hidden codeword $f\in \mathcal{F}$. The other player, Codebreaker, then tries to determine $f$ by asking a sequence of queries $q\in Q$, after each of which Codemaker must respond with the value $f(q)$. The goal of Codebreaker is to uniquely determine $f$ using as few queries as possible. Two classical examples of such games are coin-weighing with a spring scale, and Mastermind, which are of interest both as recreational games and for their connection to information theory. In this paper, we will present a general framework for finding short solutions to query games. As applications, we give new self-contained proofs of the query complexity of variations of the coin-weighing problems, and prove new results that the deterministic query complexity of Mastermind with $n$ positions and $k$ colors is $\Theta(n \log k/ \log n + k)$ if only black-peg information is provided, and $\Theta(n \log k / \log n + k/n)$ if both black- and white-peg information is provided. In the deterministic setting, these are the first up to constant factor optimal solutions to Mastermind known for any $k\geq n^{1-o(1)}$.

[{'version': 'v1', 'created': 'Thu, 17 Mar 2022 17:49:07 GMT'} {'version': 'v2', 'created': 'Thu, 18 Aug 2022 18:26:40 GMT'} {'version': 'v3', 'created': 'Mon, 20 Mar 2023 12:14:08 GMT'}]

2023-03-21

[array(['Martinsson', 'Anders', ''], dtype=object)]

2004.05844

Ekkehard Kr\"uger

Ekkehard Kr\"uger

Wannier states of fcc symmetry qualifying paramagnetic NiO to be a Mott insulator

Symmetry 2020, 12(5), 687

10.3390/sym12050687

cond-mat.str-el

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

This letter extends my recent paper on antiferromagnetic NiO [Structural Distortion Stabilizing the Antiferromagnetic and Insulating Ground State of NiO, Symmetry 2020, 12(1), 56] by including also the paramagnetic phase of this compound. I report evidence that paramagnetic NiO possesses a narrow, roughly half-filled energy band that produces a nonadiabatic atomic-like motion providing the basis for a Mott insulator in the paramagnetic phase. While the atomic-like motion operating in the antiferromagnetic phase is adapted to the symmetry of the antiferromagnetic state, in the paramagnetic phase the related localized states are represented by optimally localized Wannier functions possessing the full fcc symmetry of paramagnetic NiO. The nonadiabatic Wannier states are twofold degenerate, have d-like symmetry and are situated at the Ni atoms.

[{'version': 'v1', 'created': 'Mon, 13 Apr 2020 09:51:25 GMT'}]

2020-11-25

[array(['Krüger', 'Ekkehard', ''], dtype=object)]

2205.08372

Hongtao Wang

H.T. Wang, J.S. Zhang, C.X. Zhang, Z.X. Zhao, W.F. Geng

Automatic Stack Velocity Picking Using an Unsupervised Ensemble Learning Method

cs.LG cs.CV eess.SP

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Seismic velocity picking algorithms that are both accurate and efficient can greatly speed up seismic data processing, with the primary approach being the use of velocity spectra. Despite the development of some supervised deep learning-based approaches to automatically pick the velocity, they often come with costly manual labeling expenses or lack interpretability. In comparison, using physical knowledge to drive unsupervised learning techniques has the potential to solve this problem in an efficient manner. We suggest an Unsupervised Ensemble Learning (UEL) approach to achieving a balance between reliance on labeled data and picking accuracy, with the aim of determining the stack velocity. UEL makes use of the data from nearby velocity spectra and other known sources to help pick efficient and reasonable velocity points, which are acquired through a clustering technique. Testing on both the synthetic and field data sets shows that UEL is more reliable and precise in auto-picking than traditional clustering-based techniques and the widely used Convolutional Neural Network (CNN) method.

[{'version': 'v1', 'created': 'Sat, 7 May 2022 12:58:04 GMT'} {'version': 'v2', 'created': 'Tue, 23 May 2023 07:43:24 GMT'}]

2023-05-24

[array(['Wang', 'H. T.', ''], dtype=object) array(['Zhang', 'J. S.', ''], dtype=object) array(['Zhang', 'C. X.', ''], dtype=object) array(['Zhao', 'Z. X.', ''], dtype=object) array(['Geng', 'W. F.', ''], dtype=object)]

1311.3506

Jack Button

J. O. Button

Free by cyclic groups are large

4 pages

math.GR

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

If F is a free group of finite rank at least two then any group of the form F by Z is large. In this short note we show how this statement follows by combining a very recent theorem of Hagen and Wise (using work of Agol and of Wise) with earlier results of the author.

[{'version': 'v1', 'created': 'Thu, 14 Nov 2013 13:54:22 GMT'}]

2013-11-15

[array(['Button', 'J. O.', ''], dtype=object)]

1204.5494

Zsolt Langi Dr.

G\'abor Domokos, Zsolt L\'angi, T\'i mea Szab\'o

A topological classification of convex bodies

25 pages, 10 figures

10.1007/s10711-015-0130-4

math.DG math.CO math.DS

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

The shape of homogeneous, generic, smooth convex bodies as described by the Euclidean distance with nondegenerate critical points, measured from the center of mass represents a rather restricted class M_C of Morse-Smale functions on S^2. Here we show that even M_C exhibits the complexity known for general Morse-Smale functions on S^2 by exhausting all combinatorial possibilities: every 2-colored quadrangulation of the sphere is isomorphic to a suitably represented Morse-Smale complex associated with a function in M_C (and vice versa). We prove our claim by an inductive algorithm, starting from the path graph P_2 and generating convex bodies corresponding to quadrangulations with increasing number of vertices by performing each combinatorially possible vertex splitting by a convexity-preserving local manipulation of the surface. Since convex bodies carrying Morse-Smale complexes isomorphic to P_2 exist, this algorithm not only proves our claim but also generalizes the known classification scheme in [36]. Our expansion algorithm is essentially the dual procedure to the algorithm presented by Edelsbrunner et al. in [21], producing a hierarchy of increasingly coarse Morse-Smale complexes. We point out applications to pebble shapes.

[{'version': 'v1', 'created': 'Tue, 24 Apr 2012 20:39:10 GMT'} {'version': 'v2', 'created': 'Tue, 8 Jul 2014 16:25:21 GMT'} {'version': 'v3', 'created': 'Fri, 20 Nov 2015 16:07:16 GMT'}]

2015-12-01

[array(['Domokos', 'Gábor', ''], dtype=object) array(['Lángi', 'Zsolt', ''], dtype=object) array(['Szabó', 'Tí mea', ''], dtype=object)]

2003.05351

Anna Vidotto

Domenico Marinucci, Maurizia Rossi, Anna Vidotto

Non-Universal Fluctuations of the Empirical Measure for Isotropic Stationary Fields on $\mathbb{S}^2 \times \mathbb{R}$

39 pages; comments are welcome

math.PR

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

In this paper, we consider isotropic and stationary real Gaussian random fields defined on $\mathbb{S}^2\times\mathbb{R}$ and we investigate the asymptotic behavior, as $T\rightarrow +\infty$, of the empirical measure (excursion area) in $\mathbb{S}^2\times\mathbb{R}$ at any threshold, covering both cases when the field exhibits short and long memory, i.e. integrable and non-integrable temporal covariance. It turns out that the limiting distribution is not universal, depending both on the memory parameters and the threshold. In particular, in the long memory case a form of Berry's cancellation phenomenon occurs at zero-level, inducing phase transitions for both variance rates and limiting laws.

[{'version': 'v1', 'created': 'Wed, 11 Mar 2020 15:13:45 GMT'}]

2020-03-12

[array(['Marinucci', 'Domenico', ''], dtype=object) array(['Rossi', 'Maurizia', ''], dtype=object) array(['Vidotto', 'Anna', ''], dtype=object)]

2211.04521

Joseph Toombs

Joseph Toombs, Ingrid Shan, Hayden Taylor

Ethyl cellulose-based thermoreversible organogel photoresist for sedimentation-free volumetric additive manufacturing

physics.app-ph

http://creativecommons.org/licenses/by-nc-sa/4.0/

Liquid photoresists are abundant in the field of light-based additive manufacturing (AM). However, printing unsupported directly into a vat of material in emerging volumetric AM technologies$-$typically a benefit due to fewer geometric constraints and less material waste$-$can be a limitation when printing low-viscosity liquid monomers and multimaterial constructs due to part drift or sedimentation. With ethyl cellulose (EC), a thermoplastic soluble in organic liquids, we formulate a simple three-component transparent thermoreversible gel photoresist with melting temperature of ~64 $\deg$C. The physically crosslinked network of the gel leads to storage moduli in the range of 0.1$-$10 kPa and maximum yield stress of 2.7 kPa for a 10 wt$\%$ EC gel photoresist. Non-zero yield stress enables sedimentation-free tomographic volumetric patterning in low-viscosity monomer without additional hardware or modification of apparatus. Additionally, objects inserted into the print container can be suspended in the gel material which enables overprinting of multimaterial devices without anchors connecting the object to the printing container. Flexural strength is also improved by 100% compared to the neat monomer for a formulation with 7 wt$\%$ EC.

[{'version': 'v1', 'created': 'Tue, 8 Nov 2022 19:34:47 GMT'}]

2022-11-10

[array(['Toombs', 'Joseph', ''], dtype=object) array(['Shan', 'Ingrid', ''], dtype=object) array(['Taylor', 'Hayden', ''], dtype=object)]

math/0603499

Laurent Berger

C. Breuil, P. Schneider

First steps towards $p$-adic Langlands functoriality

math.NT math.RT

By the theory of Colmez and Fontaine, a de Rham representation of the Galois group of a local field roughly corresponds to a representation of the Weil-Deligne group equipped with an admissible filtration on the underlying vector space. Using a modification of the classical local Langlands correspondence, we associate with any pair consisting of a Weil-Deligne group representation and a type of a filtration (admissible or not) a specific locally algebraic representation of a general linear group. We advertise the conjecture that this pair comes from a de Rham representation if and only if the corresponding locally algebraic representation carries an invariant norm. In the crystalline case, the Weil-Deligne group representation is unramified and the associated locally algebraic representation can be studied using the classical Satake isomorphism. By extending the latter to a specific norm completion of the Hecke algebra, we show that the existence of an invariant norm implies that our pair, indeed, comes from a crystalline representation. We also show, by using the formalism of Tannakian categories, that this latter fact is compatible with classical unramified Langlands functoriality and therefore generalizes to arbitrary split reductive groups.

[{'version': 'v1', 'created': 'Tue, 21 Mar 2006 11:08:30 GMT'}]

2007-05-23

[array(['Breuil', 'C.', ''], dtype=object) array(['Schneider', 'P.', ''], dtype=object)]

1505.01389

Ferenc Balogh

Ferenc Balogh

The generating function enumerating words in n letters without increasing subsequences of length d and with each letter occurring r times

12 pages, 3 tables. v2: major revision including the generating function for arbitrary values of r>1 which generalize the formulae for r=2 and r=3 presented in v1, extra references added

CRM-3347

math.CO math.PR

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Gessel's famous Bessel determinant formula gives the generating function to enumerate permutations without increasing subsequences of a given length. Ekhad and Zeilberger recently proposed the challenge to find a suitable generalization to count words of length rn in an alphabet consisting of n letters in which each letter appears exactly r times and which have no increasing subsequences of length d. In this paper we present a generating function for arbitrary values of r expressible as multiple integrals of Gessel-type Toeplitz determinants multiplied by the exponentiated cycle index polynomial of the symmetric group on r letters.

[{'version': 'v1', 'created': 'Wed, 6 May 2015 15:09:42 GMT'} {'version': 'v2', 'created': 'Wed, 24 Jun 2015 04:44:51 GMT'}]

2015-06-25

[array(['Balogh', 'Ferenc', ''], dtype=object)]

1611.05531

Kazuhiro Terao

MicroBooNE collaboration: R. Acciarri, C. Adams, R. An, J. Asaadi, M. Auger, L. Bagby, B. Baller, G. Barr, M. Bass, F. Bay, M. Bishai, A. Blake, T. Bolton, L. Bugel, L. Camilleri, D. Caratelli, B. Carls, R. Castillo Fernandez, F. Cavanna, H. Chen, E. Church, D. Cianci, G. H. Collin, J. M. Conrad, M. Convery, J. I. Crespo-Anad\'on, M. Del Tutto, D. Devitt, S. Dytman, B. Eberly, A. Ereditato, L. Escudero Sanchez, J. Esquivel, B. T. Fleming, W. Foreman, A. P. Furmanski, G. T. Garvey, V. Genty, D. Goeldi, S. Gollapinni, N. Graf, E. Gramellini, H. Greenlee, R. Grosso, R. Guenette, A. Hackenburg, P. Hamilton, O. Hen, V Hewes, C. Hill, J. Ho, G. Horton-Smith, C. James, J. Jan de Vries, C.-M. Jen, L. Jiang, R. A. Johnson, B. J. P. Jones, J. Joshi, H. Jostlein, D. Kaleko, G. Karagiorgi, W. Ketchum, B. Kirby, M. Kirby, T. Kobilarcik, I. Kreslo, A. Laube, Y. Li, A. Lister, B. R. Littlejohn, S. Lockwitz, D. Lorca, W. C. Louis, M. Luethi, B. Lundberg, X. Luo, A. Marchionni, C. Mariani, J. Marshall, D. A. Martinez Caicedo, V. Meddage, T. Miceli, G. B. Mills, J. Moon, M. Mooney, C. D. Moore, J. Mousseau, R. Murrells, D. Naples, P. Nienaber, J. Nowak, O. Palamara, V. Paolone, V. Papavassiliou, S.F. Pate, Z. Pavlovic, D. Porzio, G. Pulliam, X. Qian, J. L. Raaf, A. Rafique, L. Rochester, C. Rudolf von Rohr, B. Russell, D. W. Schmitz, A. Schukraft, W. Seligman, M. H. Shaevitz, J. Sinclair, E. L. Snider, M. Soderberg, S. S\"oldner-Rembold, S. R. Soleti, P. Spentzouris, J. Spitz, J. St. John, T. Strauss, A. M. Szelc, N. Tagg, K. Terao, M. Thomson, M. Toups, Y.-T. Tsai, S. Tufanli, T. Usher, R. G. Van de Water, B. Viren, M. Weber, J. Weston, D. A. Wickremasinghe, S. Wolbers, T. Wongjirad, K. Woodruff, T. Yang, G. P. Zeller, J. Zennamo, C. Zhang

Convolutional Neural Networks Applied to Neutrino Events in a Liquid Argon Time Projection Chamber

10.1088/1748-0221/12/03/P03011

physics.ins-det hep-ex

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We present several studies of convolutional neural networks applied to data coming from the MicroBooNE detector, a liquid argon time projection chamber (LArTPC). The algorithms studied include the classification of single particle images, the localization of single particle and neutrino interactions in an image, and the detection of a simulated neutrino event overlaid with cosmic ray backgrounds taken from real detector data. These studies demonstrate the potential of convolutional neural networks for particle identification or event detection on simulated neutrino interactions. We also address technical issues that arise when applying this technique to data from a large LArTPC at or near ground level.

[{'version': 'v1', 'created': 'Thu, 17 Nov 2016 02:00:12 GMT'}]

2023-02-17

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Castillo', ''], dtype=object) array(['Cavanna', 'F.', ''], dtype=object) array(['Chen', 'H.', ''], dtype=object) array(['Church', 'E.', ''], dtype=object) array(['Cianci', 'D.', ''], dtype=object) array(['Collin', 'G. H.', ''], dtype=object) array(['Conrad', 'J. M.', ''], dtype=object) array(['Convery', 'M.', ''], dtype=object) array(['Crespo-Anadón', 'J. I.', ''], dtype=object) array(['Del Tutto', 'M.', ''], dtype=object) array(['Devitt', 'D.', ''], dtype=object) array(['Dytman', 'S.', ''], dtype=object) array(['Eberly', 'B.', ''], dtype=object) array(['Ereditato', 'A.', ''], dtype=object) array(['Sanchez', 'L. Escudero', ''], dtype=object) array(['Esquivel', 'J.', ''], dtype=object) array(['Fleming', 'B. T.', ''], dtype=object) array(['Foreman', 'W.', ''], dtype=object) array(['Furmanski', 'A. P.', ''], dtype=object) array(['Garvey', 'G. T.', ''], dtype=object) array(['Genty', 'V.', ''], dtype=object) array(['Goeldi', 'D.', ''], dtype=object) array(['Gollapinni', 'S.', ''], dtype=object) array(['Graf', 'N.', ''], dtype=object) array(['Gramellini', 'E.', ''], dtype=object) array(['Greenlee', 'H.', ''], dtype=object) array(['Grosso', 'R.', ''], dtype=object) array(['Guenette', 'R.', ''], dtype=object) array(['Hackenburg', 'A.', ''], dtype=object) array(['Hamilton', 'P.', ''], dtype=object) array(['Hen', 'O.', ''], dtype=object) array(['Hewes', 'V', ''], dtype=object) array(['Hill', 'C.', ''], dtype=object) array(['Ho', 'J.', ''], dtype=object) array(['Horton-Smith', 'G.', ''], dtype=object) array(['James', 'C.', ''], dtype=object) array(['de Vries', 'J. Jan', ''], dtype=object) array(['Jen', 'C. -M.', ''], dtype=object) array(['Jiang', 'L.', ''], dtype=object) array(['Johnson', 'R. A.', ''], dtype=object) array(['Jones', 'B. J. P.', ''], dtype=object) array(['Joshi', 'J.', ''], dtype=object) array(['Jostlein', 'H.', ''], dtype=object) array(['Kaleko', 'D.', ''], dtype=object) array(['Karagiorgi', 'G.', ''], dtype=object) array(['Ketchum', 'W.', ''], dtype=object) array(['Kirby', 'B.', ''], dtype=object) array(['Kirby', 'M.', ''], dtype=object) array(['Kobilarcik', 'T.', ''], dtype=object) array(['Kreslo', 'I.', ''], dtype=object) array(['Laube', 'A.', ''], dtype=object) array(['Li', 'Y.', ''], dtype=object) array(['Lister', 'A.', ''], dtype=object) array(['Littlejohn', 'B. R.', ''], dtype=object) array(['Lockwitz', 'S.', ''], dtype=object) array(['Lorca', 'D.', ''], dtype=object) array(['Louis', 'W. C.', ''], dtype=object) array(['Luethi', 'M.', ''], dtype=object) array(['Lundberg', 'B.', ''], dtype=object) array(['Luo', 'X.', ''], dtype=object) array(['Marchionni', 'A.', ''], dtype=object) array(['Mariani', 'C.', ''], dtype=object) array(['Marshall', 'J.', ''], dtype=object) array(['Caicedo', 'D. A. Martinez', ''], dtype=object) array(['Meddage', 'V.', ''], dtype=object) array(['Miceli', 'T.', ''], dtype=object) array(['Mills', 'G. B.', ''], dtype=object) array(['Moon', 'J.', ''], dtype=object) array(['Mooney', 'M.', ''], dtype=object) array(['Moore', 'C. D.', ''], dtype=object) array(['Mousseau', 'J.', ''], dtype=object) array(['Murrells', 'R.', ''], dtype=object) array(['Naples', 'D.', ''], dtype=object) array(['Nienaber', 'P.', ''], dtype=object) array(['Nowak', 'J.', ''], dtype=object) array(['Palamara', 'O.', ''], dtype=object) array(['Paolone', 'V.', ''], dtype=object) array(['Papavassiliou', 'V.', ''], dtype=object) array(['Pate', 'S. F.', ''], dtype=object) array(['Pavlovic', 'Z.', ''], dtype=object) array(['Porzio', 'D.', ''], dtype=object) array(['Pulliam', 'G.', ''], dtype=object) array(['Qian', 'X.', ''], dtype=object) array(['Raaf', 'J. L.', ''], dtype=object) array(['Rafique', 'A.', ''], dtype=object) array(['Rochester', 'L.', ''], dtype=object) array(['von Rohr', 'C. Rudolf', ''], dtype=object) array(['Russell', 'B.', ''], dtype=object) array(['Schmitz', 'D. W.', ''], dtype=object) array(['Schukraft', 'A.', ''], dtype=object) array(['Seligman', 'W.', ''], dtype=object) array(['Shaevitz', 'M. H.', ''], dtype=object) array(['Sinclair', 'J.', ''], dtype=object) array(['Snider', 'E. L.', ''], dtype=object) array(['Soderberg', 'M.', ''], dtype=object) array(['Söldner-Rembold', 'S.', ''], dtype=object) array(['Soleti', 'S. R.', ''], dtype=object) array(['Spentzouris', 'P.', ''], dtype=object) array(['Spitz', 'J.', ''], dtype=object) array(['John', 'J. St.', ''], dtype=object) array(['Strauss', 'T.', ''], dtype=object) array(['Szelc', 'A. M.', ''], dtype=object) array(['Tagg', 'N.', ''], dtype=object) array(['Terao', 'K.', ''], dtype=object) array(['Thomson', 'M.', ''], dtype=object) array(['Toups', 'M.', ''], dtype=object) array(['Tsai', 'Y. -T.', ''], dtype=object) array(['Tufanli', 'S.', ''], dtype=object) array(['Usher', 'T.', ''], dtype=object) array(['Van de Water', 'R. G.', ''], dtype=object) array(['Viren', 'B.', ''], dtype=object) array(['Weber', 'M.', ''], dtype=object) array(['Weston', 'J.', ''], dtype=object) array(['Wickremasinghe', 'D. A.', ''], dtype=object) array(['Wolbers', 'S.', ''], dtype=object) array(['Wongjirad', 'T.', ''], dtype=object) array(['Woodruff', 'K.', ''], dtype=object) array(['Yang', 'T.', ''], dtype=object) array(['Zeller', 'G. P.', ''], dtype=object) array(['Zennamo', 'J.', ''], dtype=object) array(['Zhang', 'C.', ''], dtype=object)]

1808.09507

Pedro Henrique Filipini Dos Santos

Pedro Henrique Filipini dos Santos, Hedibert Freitas Lopes

Tree-Based Bayesian Treatment Effect Analysis

stat.ME

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

The inclusion of the propensity score as a covariate in Bayesian regression trees for causal inference can reduce the bias in treatment effect estimations, which occurs due to the regularization-induced confounding phenomenon. This study advocate for the use of the propensity score by evaluating it under a full-Bayesian variable selection setting, and the use of Individual Conditional Expectation Plots, which is a graphical tool that can improve treatment effect analysis on tree-based Bayesian models and others "black box" models. The first one, even if poorly estimated, can lead to bias reduction on the estimated treatment effects, while the latter can be used to found groups of individuals which have different responses to the applied treatment, and analyze the impact of each variable in the estimated treatment effect.

[{'version': 'v1', 'created': 'Tue, 28 Aug 2018 19:31:28 GMT'}]

2018-08-30

[array(['Santos', 'Pedro Henrique Filipini dos', ''], dtype=object) array(['Lopes', 'Hedibert Freitas', ''], dtype=object)]

1212.2347

Marc Soret

Marc Soret (LMPT), Marina Ville (LMPT)

Some properties of simple minimal knots

math.DG math.GT

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

A minimal knot is the intersection of a topologically embedded branched minimal disk in $\mathbb{R}^4$ $\mathbb{C}^2 $ with a small sphere centered at the branch point. When the lowest order terms in each coordinate component of the embedding of the disk in $\mathbb{C}^2$ are enough to determine the knot type, we talk of a simple minimal knot. Such a knot is given by three integers $N < p,q$; denoted by $K(N,p,q)$, it can be parametrized in the cylinder as $e^{i\theta}\mapsto (e^{Ni\theta},\sin q\theta,\cos p\theta)$. From this expression stems a natural representation of $K(N,p,q)$ as an $N$-braid. In this paper, we give a formula for its writhe number, i.e. the signed number of crossing points of this braid and derive topological consequences. We also show that if $q$ and $p$ are not mutually prime, $K(N,p,q)$ is periodic. Simple minimal knots are a generalization of torus knots.

[{'version': 'v1', 'created': 'Tue, 11 Dec 2012 09:22:52 GMT'}]

2012-12-12

[array(['Soret', 'Marc', '', 'LMPT'], dtype=object) array(['Ville', 'Marina', '', 'LMPT'], dtype=object)]