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Academic Torrents
by Arvind Narayanan (Princeton University)
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There’s a lot of excitement about Bitcoin, but also a lot of confusion about what Bitcoin is and how it works. We’re offering this course focusing on the computer science behind Bitcoin to help cut through the hype and get to the core of what makes Bitcoin unique. To really understand what is special about Bitcoin, we need to understand how it works at a technical level. We’ll address the important questions about Bitcoin, such as: How does Bitcoin work? What makes Bitcoin different? How...
Source: http://academictorrents.com/details/409f4cdb063940f2210acbbecca09ca6ad8b3032
Academic Torrents
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When you take a digital photo with your phone or transform the image in Photoshop, when you play a video game or watch a movie with digital effects, when you do a web search or make a phone call, you are using technologies that build upon linear algebra. Linear algebra provides concepts that are crucial to many areas of computer science, including graphics, image processing, cryptography, machine learning, computer vision, optimization, graph algorithms, quantum computation, computational...
Source: http://academictorrents.com/details/54cd86f3038dfd446b037891406ba4e0b1200d5a
Academic Torrents
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Stanford course on Convolutional Neural Networks for Visual Recognition # Course Description Computer Vision has become ubiquitous in our society, with applications in search, image understanding, apps, mapping, medicine, drones, and self-driving cars. Core to many of these applications are visual recognition tasks such as image classification, localization and detection. Recent developments in neural network (aka “deep learning”) approaches have greatly advanced the performance of these...
Source: http://academictorrents.com/details/ed8a16ebb346e14119a03371665306609e485f13
Academic Torrents
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Lecture 1 -- Machine Learning: Introduction to Machine Learning, Linear Models for Regression Reading: Bishop, Chapter 1: sec. 1.1 - 1.5. and Chapter 3: sec. 1.1 - 1.3. Optional: Bishop, Chapter 2: Backgorund material; Hastie, Tibshirani, Friedman, Chapters 2 and 3. Lecture 2 -- Bayesian Framework: Bayesian Linear Regression, Evidence Maximization. Linear Models for Classification. Reading: Bishop, Chapter 3: sec. 3.3 - 3.5. Chapter 4. Optional: Radford Neal's NIPS tutorial on Bayesian Methods...
Source: http://academictorrents.com/details/deb96e8d1f88d9b3a09098ce27c986507ae97b5e
Academic Torrents
by Catherine R. Lucey, MD (University of California San Francisco)
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Participants will learn how to move efficiently from patient signs and symptoms to a rational and prioritized set of diagnostic possibilities and will learn how to study and read to facilitate this process. Clinical problem solving or diagnostic reasoning is the skill that physicians use to understand a patient’s complaints and then to identify a short, prioritized list of possible diagnoses that could account for those complaints. This differential diagnosis then drives the choice of...
Source: http://academictorrents.com/details/dae02888e2fb6484a7b471cb7977eb859aba4831
Academic Torrents
by Dr. Keith Devlin (Stanford University)
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About this course: Learn how to think the way mathematicians do - a powerful cognitive process developed over thousands of years. The goal of the course is to help you develop a valuable mental ability – a powerful way of thinking that our ancestors have developed over three thousand years. Mathematical thinking is not the same as doing mathematics – at least not as mathematics is typically presented in our school system. School math typically focuses on learning procedures to solve highly...
Source: http://academictorrents.com/details/2b5e5cc8c7414bc3b0f6974190065bc8c2f629dc
Academic Torrents
by Wen-mei W. Hwu (University of Illinois)
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This course introduces concepts, languages, techniques, and patterns for programming heterogeneous, massively parallel processors. Its contents and structure have been significantly revised based on the experience gained from its initial offering in 2012. It covers heterogeneous computing architectures, data-parallel programming models, techniques for memory bandwidth management, and parallel algorithm patterns. All computing systems, from mobile to supercomputers, are becoming heterogeneous,...
Source: http://academictorrents.com/details/8903d0871c652b96c7b29db738cea76902d65888
Academic Torrents
by University of Maryl
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An introduction to quantum physics with emphasis on topics at the frontiers of research, and developing understanding through exercise. Quantum physics is the foundation for much of modern technology, provides the framework for understanding light and matter from the subatomic to macroscopic domains, and makes possible the most precise measurements ever made. More than just a theory, it offers a way of looking at the world that grows richer with experience and practice. Our course will provide...
Source: http://academictorrents.com/details/f24122f15283757aa8a9bf9cb638db266273442d
Arxiv.org
by B. S. Ratanpal; V. O. Thomas; D. M. Pandya
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A new class of exact solutions of Einstein's field equations representing anisotropic distribution of matter on pseudo-spheroidal spacetime is obtained. The parameters appearing in the model are restricted through physical requirements of the model. It is found that the models given in the present work is compatible with observational data of a wide variety of compact objects like 4U 1820-30, PSR J1903+327, 4U 1608-52, Vela X-1, PSR J1614-2230, SMC X-4, Cen X-3. A particular model of pulsar PSR...
Topic: General Relativity and Quantum Cosmology
Source: http://arxiv.org/abs/1506.08512
Arxiv.org
by Gregory Fleishman; Maria Loukitcheva; Gelu Nita
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We developed an efficient algorithm integrated in our 3D modeling tool, GX Simulator (Nita et al. 2015), allowing quick computation of the synthetic intensity and polarization maps of solar active regions (AR) in the ALMA spectral range. The algorithm analyzes the photospheric input (white light and magnetogram) to classify a given photospheric pixel to belong to a given photospheric structure. Then, a 1D chromospheric model (Fontenla et al. 2009) is added on top of each pixel, which forms a...
Topics: Solar and Stellar Astrophysics, Astrophysics
Source: http://arxiv.org/abs/1506.08395
Arxiv.org
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We study non-viscous and viscous holographic dark energy models for a homogeneous and isotropic flat Friedmann-Robertson-Walker Universe in $f(R,T)$ gravity. We find that the Hubble horizon as an IR cut-off is suitable for both the models to explain the recent accelerated expansion of the Universe. The cosmological parameters like deceleration parameter and statefinder parameters are discussed in each model. In non-viscous model a constant deceleration parameter is found which shows that there...
Topic: General Relativity and Quantum Cosmology
Source: http://arxiv.org/abs/1507.07314
A measurement of the underlying event (UE) activity in proton-proton collisions is performed using events with charged-particle jets produced in the central pseudorapidity region (abs(eta[jet]) < 2) and with transverse momentum 1 0.5 GeV, in the azimuthal region transverse to the highest pt jet direction. By further dividing the transverse region into two regions of smaller and larger activity, various components of the UE activity are separated. The measurements are compared to previous...
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1507.07229
Arxiv.org
by Sergey Lee; Denis Baranov; Alexander Krasnok; Pavel Belov
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Engineering of intensity and direction of radiation from a single quantum emitter by means of structuring of their environment at the nanoscale is at the cornerstone of modern nanophotonics. Recently discovered systems exhibiting spin--orbit coupling of light are of particular interest in this context. In this Letter, we have demonstrated that asymmetrical excitation of a high-index subwavelength dielectric nanoparticle by a point dipole source located in a notch at its surface results in...
Topics: Optics, Physics
Source: http://arxiv.org/abs/1508.02731
Arxiv.org
by Roberta Paladini; Adriano Ingallinera; Claudia Agliozzo; Christopher T. Tibbs; Alberto Noriega-Crespo; Grazia Umana; Clive Dickinson; Corrado Trigilio
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The detection of an excess of emission at microwave frequencies with respect to the predicted free-free emission has been reported for several Galactic HII regions. Here, we investigate the case of RCW 49, for which the Cosmic Background Imager tentatively (~ 3 sigma) detected Anomalous Microwave Emission at 31 GHz on angular scales of 7'. Using the Australia Telescope Compact Array, we carried out a multi-frequency (5 GHz, 19 GHz and 34 GHz) continuum study of the region, complemented by...
Topics: Astrophysics, Astrophysics of Galaxies
Source: http://arxiv.org/abs/1509.08515
Arxiv.org
by E. Iancu; J. D. Madrigal; A. H. Mueller; G. Soyez; D. N. Triantafyllopoulos
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Linear and non-linear QCD evolutions at high energy suffer from severe issues related to convergence, due to higher order corrections enhanced by large double and single transverse logarithms. We resum double logarithms to all orders by taking into account successive soft gluon emissions strongly ordered in lifetime. We further resum single logarithms generated by the first non-singular part of the splitting functions and by the one-loop running of the coupling. The resulting collinearly...
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1509.08214
Arxiv.org
by Kun He; Yiwei Sun; David Bindel; John E Hopcroft; Yixuan Li
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Based on the definition of local spectral subspace, we propose a novel approach called LOSP for local overlapping community detection. Instead of using the invariant subspace spanned by the dominant eigenvectors of the entire network, we run the power method for a few steps to approximate the leading eigenvectors that depict the embedding of the local neighborhood structure around seeds of interest. We then seek a sparse approximate indicator vector in the local spectral subspace spanned by...
Topics: Physics and Society, Social and Information Networks, Computing Research Repository, Physics
Source: http://arxiv.org/abs/1509.08065
Arxiv.org
by John Ellis; Jason L. Evans; Feng Luo; Natsumi Nagata; Keith A. Olive; Pearl Sandick
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We consider two potential non-accelerator signatures of generalizations of the well-studied constrained minimal supersymmetric standard model (CMSSM). In one generalization, the universality constraints on soft supersymmetry-breaking parameters are applied at some input scale $M_{in}$ below the grand unification (GUT) scale $M_{GUT}$, a scenario referred to as `sub-GUT'. The other generalization we consider is to retain GUT-scale universality for the squark and slepton masses, but to relax...
Topics: Cosmology and Nongalactic Astrophysics, Astrophysics, High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1509.08838
Arxiv.org
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In these proceedings for CIPANP2015 we present a brief overview of the current status of the theoretical approaches used by our group for the extraction of $|V_{cb}|$ and $|V_{ub}|$ through inclusive semi-leptonic $B$ decays. We discuss the calculations and implications of the recent perturbative corrections to power-suppressed contributions for $|V_{cb}|$, and present an overview of the major sources of theoretical uncertainty for $|V_{ub}|$.
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1509.08782
Arxiv.org
by Paweł Gawrychowski; Tomohiro I; Shunsuke Inenaga; Dominik Köppl; Florin Manea
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For $\alpha\geq 1$, an $\alpha$-gapped repeat in a word $w$ is a factor $uvu$ of $w$ such that $|uv|\leq \alpha |u|$; the two factors $u$ in such a repeat are called arms, while the factor $v$ is called gap. Such a repeat is called maximal if its arms cannot be extended simultaneously with the same symbol to the right or, respectively, to the left. In this paper we show that the number of maximal $\alpha$-gapped repeats that may occur in a word is upper bounded by $18\alpha n$. This allows us...
Topics: Data Structures and Algorithms, Computing Research Repository
Source: http://arxiv.org/abs/1509.09237
Arxiv.org
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There is a common need to search of molecular databases for compounds resembling some shape, what suggests having similar biological activity while searching for new drugs. The large size of the databases requires fast methods for such initial screening, for example based on feature vectors constructed to fulfill the requirement that similar molecules should correspond to close vectors. Ultrafast Shape Recognition (USR) is a popular approach of this type. It uses vectors of 12 real number as 3...
Topics: Computational Engineering, Finance, and Science, Computing Research Repository
Source: http://arxiv.org/abs/1509.09211
Arxiv.org
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The influence of disorder, both structural (non-diagonal) and on-site (diagonal), is studied through the inhomogeneous Bogoliubov-de Gennes (BdG) theory in narrow-band disordered superconductors with a view towards understanding superconductivity in boron doped diamond (BDD) and boron- doped nanocrystalline diamond (BNCD) films. We employ the attractive Hubbard model within the mean field approximation, including the Coulomb interaction between holes in the narrow acceptor band. We study...
Topics: Superconductivity, Condensed Matter
Source: http://arxiv.org/abs/1509.09248
Arxiv.org
by Wim Beenakker; Christoph Borschensky; Michael Krämer; Anna Kulesza; Eric Laenen; Simone Marzani; Juan Rojo
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We present updated predictions for the cross-sections for pair production of squarks and gluinos at the LHC Run II. First of all, we update the calculations based on NLO+NLL partonic cross-sections by using the NNPDF3.0NLO global analysis. This study includes a full characterization of theoretical uncertainties from higher orders, PDFs and the strong coupling. Then, we explore the implications for this calculation of the recent NNPDF3.0 PDFs with NLO+NLL threshold resummation. We find that the...
Topics: High Energy Physics - Experiment, High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1510.00375
Arxiv.org
by Patrizio Angelini; Giordano Da Lozzo; Giuseppe Di Battista; Valentino Di Donato; Philipp Kindermann; Günter Rote; Ignaz Rutter
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Given a planar graph $G(V,E)$ and a partition of the neighbors of each vertex $v \in V$ in four sets $UR(v)$, $UL(v)$, $DL(v)$, and $DR(v)$, the problem Windrose Planarity asks to decide whether $G$ admits a windrose-planar drawing, that is, a planar drawing in which (i) each neighbor $u \in UR(v)$ is above and to the right of $v$, (ii) each neighbor $u \in UL(v)$ is above and to the left of $v$, (iii) each neighbor $u \in DL(v)$ is below and to the left of $v$, (iv) each neighbor $u \in DR(v)$...
Topics: Computational Geometry, Computing Research Repository
Source: http://arxiv.org/abs/1510.02659
Arxiv.org
by Masaaki Fujii; Akihiko Takahashi
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The paper develops an asymptotic expansion method for forward-backward SDEs (FBSDEs) driven by the random Poisson measures with sigma-finite compensators. The expansion is performed around the small-variance limit of the forward SDE and does not necessarily require a small size of the non-linearity in the BSDE's driver, which was actually the case for the linearization method proposed by the current authors in a Brownian setup before. A semi-analytic solution technique, which only requires a...
Topics: Computational Finance, Mathematical Finance, Quantitative Finance
Source: http://arxiv.org/abs/1510.03220
Arxiv.org
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In this paper, we consider the normalized least squares estimator of the parameter in a mildly stationary first-order autoregressive model with dependent errors which are modeled as a mildly stationary AR(1) process. By martingale methods, we establish the moderate deviations for the least squares estimators of the regressor and error, which can be applied to understand the near-integrated second order autoregressive processes. As an application, we obtain the moderate deviations for the...
Topics: Statistics Theory, Probability, Statistics, Mathematics
Source: http://arxiv.org/abs/1510.02862
Arxiv.org
by Y. K. Hsiao; C. Q. Geng
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We use the exclusive baryonic $B$ decays to determine the Cabibbo-Kobayashi-Maskawa (CKM) matrix element $V_{ub}$. From the relation $|V_{ub}|^2/|V_{cb}|^2=({\cal B}_\pi/{\cal B}_D){\cal R}_{ff}$ based on $B^-\to p\bar p \pi^-$ and $\bar B^0\to p\bar p D^0$ decays, where $|V_{cb}|$ and ${\cal B}_\pi/{\cal B}_D\equiv{\cal B}(B^-\to p\bar p \pi^-)/{\cal B}(\bar B^0\to p\bar p D^0)$ are the data input parameters, while ${\cal R}_{ff}$ is the one fixed by the $B\to p\bar p$ transition matrix...
Topics: High Energy Physics - Experiment, High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1510.04414
Arxiv.org
by C. Danielle Leonard; Pedro G. Ferreira; Catherine Heymans
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We present a complete derivation of the observationally motivated definition of the modified gravity statistic $E_G$. Using this expression, we investigate how variations to theory and survey parameters may introduce uncertainty in the general relativistic prediction of $E_G$. We forecast errors on $E_G$ for measurements using two combinations of upcoming surveys, and find that theoretical uncertainties may dominate for a futuristic measurement. Finally, we compute predictions of $E_G$ under...
Topics: Cosmology and Nongalactic Astrophysics, Astrophysics
Source: http://arxiv.org/abs/1510.04287
Arxiv.org
by Xiongzhi Chen; R. W. Doerge
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For multiple testing, we introduce Storey-type FDR procedures and the concept of "regular estimator of the proportion of true nulls". We show that the rejection threshold of a Storey-type FDR procedure is a stopping time with respect to the backward filtration generated by the p-values and that a Storey-type FDR estimator at this rejection threshold equals the pre-specified FDR level, when the estimator of the proportion of true nulls is regular. These results hold regardless of the...
Topics: Statistics Theory, Statistics, Mathematics
Source: http://arxiv.org/abs/1510.04351
Arxiv.org
by Richard Schoen; Hung Tran
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We study the spectrum of complete noncompact manifolds with bounded curvature and positive injectivity radius. We give general conditions which imply that their essential spectrum has an arbitrarily large finite number of gaps. In particular, for any noncompact covering of a compact manifold, there is a metric on the base so that the lifted metric has an arbitrarily large finite number of gaps in its essential spectrum. Also, for any complete noncompact manifold with bounded curvature and...
Topics: Differential Geometry, Spectral Theory, Mathematics
Source: http://arxiv.org/abs/1510.05046
Arxiv.org
by Mozhgan Entekhabi; Kirk E. Lancaster
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Consider a solution $f\in C^{2}(\Omega)$ of a prescribed mean curvature equation \[ {\rm div}\left(\frac{\nabla f}{\sqrt{1+|\nabla f|^{2}}}\right)=2H(x,f) \ \ \ \ {\rm in} \ \ \Omega, \] where $\Omega\subset \Real^{2}$ is a domain whose boundary has a corner at ${\cal O}=(0,0)\in\partial\Omega.$ If $\sup_{x\in\Omega} |f(x)|$ and $\sup_{x\in\Omega} |H(x,f(x))|$ are both finite and $\Omega$ has a reentrant corner at ${\cal O},$ then the radial limits of $f$ at ${\cal O},$ \[ Rf(\theta) \myeq...
Topics: Analysis of PDEs, Mathematics
Source: http://arxiv.org/abs/1510.05288
Using nonrelativistic QCD (NRQCD) factorization, we calculate the yields for $J/\psi$, $\psi(2S)$ and $\Upsilon(1S)$ hadroproduction at $\sqrt{s}=$ 72 GeV and 115 GeV including the next-to-leading order QCD corrections. Both these center-of-mass energies correspond to those obtained with 7~TeV and 2.76~TeV nucleon beam impinging a fixed target. We study the cross section integrated in $p_t$ as a function of the rapidity as well as the $p_t$ differential cross section in the central rapidity...
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1510.05277
Arxiv.org
by Francois Gelis; Naoto Tanji
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In this article, we review recent theoretical works on the Schwingermechanism of particle production in external electrical fields. Although the non-perturbative Schwinger mechanism is at the center of this discussion, many of the approaches that we discuss can cope with general time and space dependent fields, and therefore also capture the perturbative contributions to particle production.
Topics: Nuclear Theory, High Energy Physics - Phenomenology, High Energy Physics - Theory
Source: http://arxiv.org/abs/1510.05451
Arxiv.org
by Mohammad Hosseini; Yu Jiang; Poliang Wu; Richard B. Berlin; Lui Sha
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Software is everywhere. The increasing requirement of supporting a wide variety of domains has rapidly increased the complexity of software systems, making them hard to maintain and the training process harder for end-users, which in turn ultimately demanded the development of user-friendly application software with simple interfaces that makes them easy, especially for non-professional personnel, to employ, and interact with. However, due to the lack of source code access for third-party...
Topics: Software Engineering, Computing Research Repository
Source: http://arxiv.org/abs/1510.05606
Arxiv.org
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Critical dynamics of cortical neurons have been intensively studied over the past decade. Neuronal avalanches provide the main experimental as well as theoretical tools to consider criticality in such systems. Experimental studies show that critical neuronal avalanches show mean-field behavior. There are structural as well as recently proposed [Phys. Rev. E 89, 052139 (2014)] dynamical mechanisms which can lead to mean-field behavior. In this work we consider a simple model of neuronal dynamics...
Topics: Adaptation and Self-Organizing Systems, Statistical Mechanics, Condensed Matter, Nonlinear Sciences
Source: http://arxiv.org/abs/1510.05702
Arxiv.org
by Roberto C. S. N. P. Souza; Denise E. F de Brito; Renato M. Assunção; Wagner Meira
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Exploiting the large amount of available data for addressing relevant social problems has been one of the key challenges in data mining. Such efforts have been recently named "data science for social good" and attracted the attention of several researchers and institutions. We give a contribution in this objective in this paper considering a difficult public health problem, the timely monitoring of dengue epidemics in small geographical areas. We develop a generative simple yet...
Topics: Statistics, Social and Information Networks, Machine Learning, Computing Research Repository
Source: http://arxiv.org/abs/1510.05981
Arxiv.org
by Yannick Herfray; Kirill Krasnov; Yuri Shtanov
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In four space-time dimensions, there exists a special infinite-parameter family of chiral modified gravity theories. All these theories describe just two propagating polarizations of the graviton. General Relativity with an arbitrary cosmological constant is the only parity-invariant member of this family. We review how these modified gravity theories arise within the framework of pure-connection formulation. We introduce a new convenient parametrisation of this family of theories by using...
Topics: General Relativity and Quantum Cosmology, High Energy Physics - Theory
Source: http://arxiv.org/abs/1510.05820
Arxiv.org
by Raphael F. Ribeiro; Kieron Burke
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A thorough account is given of the derivation of uniform semiclassical approximations to the particle and kinetic energy densities of N noninteracting bounded fermions in one dimension. The employed methodology allows the inclusion of non-perturbative effects via an infinite resummation of the Poisson summation formula.
Topic: Quantum Physics
Source: http://arxiv.org/abs/1510.05676
Arxiv.org
by S. Avdan; A. Vinokurov; S. Fabrika; K. Atapin; H. Avdan; A. Akyuz; O. Sholukhova; N. Aksaker; A. Valeev
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We identified two optical counterparts of brightest ultraluminous X-ray Sources (ULXs) in galaxies NGC5474 and NGC3627 (M66). The counterparts in Hubble Space Telescope images are very faint, their V magnitudes are 24.7 ($M_V \approx -4.5$) and 25.9 ($M_V \approx -4.2$), respectively. NGC5474 X-1 changes the X-ray flux more than two orders of magnitude, in its bright state it has $L_X \approx 1.6 \times 10^{40}$ erg/s, the spectrum is best fitted by an absorbed power-law model with a photon...
Topics: Astrophysics, High Energy Astrophysical Phenomena
Source: http://arxiv.org/abs/1510.07915
Arxiv.org
by Julia Hörrmann; Wolfgang Weil
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Valuations, as additive functionals, allow various applications in Stochastic Geometry, yielding mean value formulas for specific random closed sets and processes of convex or polyconvex particles. In particular, valuations are especially adapted to Boolean models, the latter being the union sets of Poisson particle processes. In this chapter, we collect mean value formulas for scalar- and tensor-valued valuations applied to Boolean models under quite general invariance assumptions.
Topics: Probability, Metric Geometry, Mathematics
Source: http://arxiv.org/abs/1510.07910
Arxiv.org
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In a companion paper, we proposed combining large numbers of "fuzzy archetypes" with Self-Organizing Maps (SOMs) to derive photometric redshifts in a data-driven way. In this paper, we investigate the performance of several sampling approaches that build on this general idea using a mock catalog designed to approximately simulate LSST ($ugrizY$) and Euclid ($YJH$) data from $z=0-6$ at fixed LSST $Y=24$ mag. We test eight different approaches: two brute-force methods, two Markov Chain...
Topics: Cosmology and Nongalactic Astrophysics, Astrophysics
Source: http://arxiv.org/abs/1510.08080
Arxiv.org
by A. Mercurio; M. Annunziatella; A. Biviano; M. Nonino; P. Rosati; I. Balestra; M. Brescia; M. Girardi; R. Gobat; C. Grillo; M. Lombardi; B. Sartoris; the CLASH-VLT team
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We present the optical luminosity functions (LFs) of galaxies for the CLASH-VLT cluster MACS J1206.2-0847 at z=0.439, based on HST and SUBARU data, including ~600 spectroscopically confirmed member galaxies. The LFs on the wide SUBARU FoV are well described by a single Schechter function down to M~M*+3, whereas this fit is poor for HST data, due to a faint-end upturn visible down M~M*+7, suggesting a bimodal behaviour. We also investigate the effect of local environment by deriving the LFs in...
Topics: Astrophysics, Astrophysics of Galaxies
Source: http://arxiv.org/abs/1510.08097
Arxiv.org
by Alexander Belyaev; Veronica Sanz; Marc Thomas
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Understanding the extent to which experimental searches are sensitive to Light Stops (LST) scenarios is essential to resolve questions about naturalness, electroweak baryogenesis and Dark Matter. In this paper we characterize the reach on LST scenarios in two ways. We extend experimental searches to cover specific gaps in the LST parameter space, showing for the first time that assuming a single decay channel one can exclude the region of $m_{\tilde{t}}
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1510.07688
Arxiv.org
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We introduce a class of gapped Hamiltonians on quantum spin chains, which allows asymmetric edge ground states. This class is an asymmetric generalization of the class of Hamiltonians in [FNS]. It can be characterized by five qualitative physical properties of ground state structures. In this Part I, we introduce the models and investigate their properties.
Topics: Mathematical Physics, Mathematics
Source: http://arxiv.org/abs/1510.07753
Arxiv.org
by F. Massaro; D. J. Thompson; E. C. Ferrara
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The Universe is largely transparent to $\gamma$ rays in the GeV energy range, making these high-energy photons valuable for exploring energetic processes in the cosmos. After seven years of operation, the Fermi {\it Gamma-ray Space Telescope} has produced a wealth of information about the high-energy sky. This review focuses on extragalactic $\gamma$-ray sources: what has been learned about the sources themselves and about how they can be used as cosmological probes. Active galactic nuclei...
Topics: Astrophysics, High Energy Astrophysical Phenomena
Source: http://arxiv.org/abs/1510.07660
Arxiv.org
by Suman Sarkar; Kazi Rafsanjani Amin; Ranjan Modak; Amandeep Singh; Subroto Mukerjee; Aveek Bid
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Detailed experimental and theoretical studies of the temperature dependence of the effect of different scattering mechanisms on electrical transport properties of graphene devices are presented. We find that for high mobility devices the transport properties are mainly governed by completely screened short range impurity scattering. On the other hand, for the low mobility devices transport properties are determined by both types of scattering potentials - long range due to ionized impurities...
Topics: Mesoscale and Nanoscale Physics, Condensed Matter
Source: http://arxiv.org/abs/1510.08296
Arxiv.org
by Yutaka Fujita; Nozomu Kawakatu; Isaac Shlosman; Hirotaka Ito
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We analyse the environment of the supermassive black hole (SMBH) in the centre of a massive elliptical galaxy NGC 1275 in the Perseus cluster, hosting the radio source 3C 84. We focus on the young radio lobe observed inside the estimated Bondi accretion radius. We discuss the momentum balance between the jet associated with the lobe and the surrounding gas. The results are compared with the proper motion of the radio lobe obtained with the very long baseline interferometry. We find that under...
Topics: Astrophysics, Astrophysics of Galaxies, High Energy Astrophysical Phenomena
Source: http://arxiv.org/abs/1510.08460
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by Nathaniel Roth; Daniel Kasen; James Guillochon; Enrico Ramirez-Ruiz
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Observations of luminous flares resulting from the possible tidal disruption of stars by supermassive black holes have raised a number of puzzles. Outstanding questions include the origin of the optical and ultraviolet (UV) flux, the weakness of hydrogen lines in the spectrum, and the occasional simultaneous observation of x-rays. Here we study the emission from tidal disruption events (TDEs) produced as radiation from black hole accretion propagates through an extended, optically thick...
Topics: Astrophysics, High Energy Astrophysical Phenomena
Source: http://arxiv.org/abs/1510.08454
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By means of transformations to nonlinear Klein-Gordon equations, we show that a generalized short pulse equation is integrable in two (and, most probably, only two) distinct cases of its coefficients. The first case is the original short pulse equation (SPE). The second case, which we call the single-cycle pulse equation (SCPE), is a previously overlooked scalar reduction of a known integrable system of coupled SPEs. We get the Lax pair and bi-Hamiltonian structure for the SCPE and show that...
Topics: Mathematics, Pattern Formation and Solitons, Exactly Solvable and Integrable Systems, Mathematical...
Source: http://arxiv.org/abs/1510.08822
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by Alessio Notari; Miguel Quartin
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Cosmic Microwave Background (CMB) experiments, such as WMAP and Planck, measure intensity anisotropies and build maps using a linearized formula for relating them to the temperature blackbody fluctuations. However, this procedure also generates a signal in the maps in the form of y-type distortions which is degenerate with the thermal Sunyaev Zel'dovich (tSZ) effect. These are small effects that arise at second-order in the temperature fluctuations not from primordial physics but from such a...
Topics: Cosmology and Nongalactic Astrophysics, Astrophysics
Source: http://arxiv.org/abs/1510.08793
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by Amit Giveon; David Kutasov
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We show that in any two dimensional conformal field theory with (2, 2) supersymmetry one can define a supersymmetric analog of the usual Renyi entropy of a spatial region A. It differs from the Renyi entropy by a universal function (which we compute) of the central charge, Renyi parameter n and the geometric parameters of A. In the limit $n \to1$ it coincides with the entanglement entropy. Thus, it contains the same information as the Renyi entropy but its computation only involves correlation...
Topic: High Energy Physics - Theory
Source: http://arxiv.org/abs/1510.08872
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by Ben Fuller
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We introduce semidirect products of skew monoidal categories as a categorification of semidirect products of monoids (or, perhaps more familiarly, of groups). We also discuss how this construction interacts with monoidal, autonomous and closed monoidal structures. We end by producing some examples of monoidal categories which are left closed but not right closed.
Topics: Category Theory, Mathematics
Source: http://arxiv.org/abs/1510.08717
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The Bernstein-B\'ezier form of a polynomial is widely used in the fields of computer aided geometric design, spline approximation theory and, more recently, for high order finite element methods for the solution of partial differential equations. However, if one wishes to compute the classical Lagrange interpolant relative to the Bernstein basis, then the resulting Bernstein-Vandermonde matrix is found to be highly ill-conditioned. In the univariate case of degree $n$, Marco and Martinez showed...
Topics: Numerical Analysis, Mathematics
Source: http://arxiv.org/abs/1510.09197
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by Frédéric Haziza; Lukáš Holík; Roland Meyer; Sebastian Wolff
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We propose a novel notion of pointer race for concurrent programs manipulating a shared heap. A pointer race is an access to a memory address which was freed, and it is out of the accessor's control whether or not the cell has been re-allocated. We establish two results. (1) Under the assumption of pointer race freedom, it is sound to verify a program running under explicit memory management as if it was running with garbage collection. (2) Even the requirement of pointer race freedom itself...
Topics: Programming Languages, Computing Research Repository
Source: http://arxiv.org/abs/1511.00184
Arxiv.org
by João C. Getelina; Francisco C. Alcaraz; José A. Hoyos
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We study the R\'enyi entanglement entropy and the Shannon mutual information for a class of spin-1/2 quantum critical XXZ chains with random coupling constants which are partially correlated. In the XX case, distinctly from the usual uncorrelated random case where the system is governed by an infinite-disorder fixed point, the correlated-disorder chain is governed by finite-disorder fixed points. Surprisingly, we verify that, although the system is not conformally invariant, the leading...
Topics: Disordered Systems and Neural Networks, Statistical Mechanics, Condensed Matter
Source: http://arxiv.org/abs/1511.00618
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by Wei Li; Xudong Yu; Jing Zhang
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We present the experimental measurement of a squeezed vacuum state by means of a bichromatic local oscillator (BLO). A pair of local oscillators at $\pm$5 MHz around the central frequency $\omega_{0}$ of the fundamental field with equal power are generated by three acousto-optic modulators and phase-locked, which are used as a BLO. The squeezed vacuum light are detected by a phase-sensitive balanced-homodyne detection with a BLO. The baseband signal around $\omega_{0}$ combined with a broad...
Topic: Quantum Physics
Source: http://arxiv.org/abs/1510.09062
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In this paper, we investigate generalized Carleman kinetic equation for n$\ge$2 and prove convergence towards the solution of equation with fast diffusion or porous medium type, $u_t=\Delta u^m$ ($0\le m\le2$), in its diffusive hydrodynamic limit. Using comparison principle of system combined with fixed speed propagation property of transport equation, we create a new barrier argument for this hyperbolic system. It is crucial to construct explicit local sub and solution of system and this is...
Topics: Analysis of PDEs, Mathematics
Source: http://arxiv.org/abs/1510.08997
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by Michael P. Zaletel; Zhenyue Zhu; Yuan-Ming Lu; Ashvin Vishwanath; Steven R. White
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The anyonic excitations of a spin-liquid can feature fractional quantum numbers under space-group symmetries. Detecting these fractional quantum numbers, which are analogs of the fractional charge of Laughlin quasiparticles, may prove easier than the direct observation of anyonic braiding and statistics. Motivated by the recent numerical discovery of spin-liquid phases in the kagome Heisenberg antiferromagnet, we theoretically predict the pattern of space group symmetry fractionalization in the...
Topics: Strongly Correlated Electrons, Condensed Matter
Source: http://arxiv.org/abs/1511.01510
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by Ming-Jie Tao; Qing Ai; Fu-Guo Deng; Yuan-Chung Cheng
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The structure of Fenna-Matthews-Olson (FMO) light-harvesting complex has long been recognized as containing seven bacteriochlorophyll (BChl) molecules. Recently, an additional BChl molecule was discovered in the crystal structure of the FMO complex, which may serve as a link between baseplate and the remaining seven molecules. Here, we investigate excitation energy transfer (EET) process by simulating single-molecule pump-dump experiment in the eight-molecules complex. We adopt the coherent...
Topics: Quantum Physics, Biological Physics, Chemical Physics, Atomic Physics, Physics
Source: http://arxiv.org/abs/1511.01461
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by Ke Wei; Jian-Feng Cai; Tony F. Chan; Shingyu Leung
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We establish theoretical recovery guarantees of a family of Riemannian optimization algorithms for low rank matrix recovery, which is about recovering an $m\times n$ rank $r$ matrix from $p < mn$ number of linear measurements. The algorithms are first interpreted as iterative hard thresholding algorithms with subspace projections. Based on this connection, we show that provided the restricted isometry constant $R_{3r}$ of the sensing operator is less than $C_\kappa /\sqrt{r}$, the Riemannian...
Topics: Numerical Analysis, Mathematics
Source: http://arxiv.org/abs/1511.01562
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by Vladimir Mitev; Elli Pomoni
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We calculate supersymmetric Wilson loops on the ellipsoid for a large class of $\mathcal{N}=2$ SCFT using the localization formula of Hama and Hosomichi. From them we extract the radiation emitted by an accelerating heavy probe quark as well as the entanglement entropy following the recent works of Lewkowycz-Maldacena and Fiol-Gerchkovitz-Komargodski. Comparing our results with the $\mathcal{N}=4$ SYM ones, we obtain interpolating functions $f(g^2)$ such that a given $\mathcal{N}=2$ SCFT...
Topic: High Energy Physics - Theory
Source: http://arxiv.org/abs/1511.02217
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From black hole thermodynamics, the Bekenstein bound has been proposed as a universal thermal entropy bound. It has been further generalized to an entanglement entropy bound which is valid even in a quantum system. In a quantumly entangled system, the non-negativity of the relative entropy leads to the entanglement entropy bound. When the entanglement entropy bound is saturated, a quantum system satisfies the thermodynamics-like law with an appropriately defined entanglement temperature. We...
Topic: High Energy Physics - Theory
Source: http://arxiv.org/abs/1511.02288
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by Eric Heim; Matthew Berger; Lee Seversky; Milos Hauskrecht
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Learning a model of perceptual similarity from a collection of objects is a fundamental task in machine learning underlying numerous applications. A common way to learn such a model is from relative comparisons in the form of triplets: responses to queries of the form "Is object a more similar to b than it is to c?". If no consideration is made in the determination of which queries to ask, existing similarity learning methods can require a prohibitively large number of responses. In...
Topics: Learning, Statistics, Machine Learning, Computing Research Repository
Source: http://arxiv.org/abs/1511.02254
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by Dogan Comez; Mrinal Kanti Roychowdhury
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Quantization of a probability distribution is the process of estimating a given probability by a discrete probability that assumes only a finite number of levels in its support. Let $P$ be a Borel probability measure on $\mathbb R^2$ which has support the Sierpi\'nski carpet generated by the four contractive similarity mappings on $\mathbb R^2$ with equal similarity ratios. For this probability measure, in this paper, the optimal sets of $n$-means and the $n$th quantization errors are...
Topics: Dynamical Systems, Mathematics
Source: http://arxiv.org/abs/1511.01990
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by Nicholas A. Featherstone; Bradley W. Hindman
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Convection plays a central role in the dynamics of any stellar interior, and yet its operation remains largely-hidden from direct observation. As a result, much of our understanding concerning stellar convection necessarily derives from theoretical and computational models. The Sun is, however, exceptional in that regard. The wealth of observational data afforded by its proximity provides a unique testbed for comparing convection models against observations. When such comparisons are carried...
Topics: Astrophysics, Earth and Planetary Astrophysics, Solar and Stellar Astrophysics
Source: http://arxiv.org/abs/1511.02396
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by Sammy Luo; Mark Sellke
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The tensor square conjecture states that for $n \geq 10$, there is an irreducible representation $V$ of the symmetric group $S_n$ such that $V \otimes V$ contains every irreducible representation of $S_n$. Our main result is that for large enough $n$, there exists an irreducible representation $V$ such that $V^{\otimes 4}$ contains every irreducible representation. We also show that tensor squares of certain irreducible representations contain $(1-o(1))$-fraction of irreducible representations...
Topics: Combinatorics, Mathematics
Source: http://arxiv.org/abs/1511.02387
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by P. L. Robinson
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We present a proof of completeness for the implicational propositional calculus, based on a variant of the Lindenbaum procedure.
Topics: Logic, Mathematics
Source: http://arxiv.org/abs/1511.02953
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by Abdul Jawad; Davood Momeni; Shamaila Rani; Ratbay Myrzakulov
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This paper is devoted to analyze the dynamical instability of a self-gravitating object undergoes to collapse process. We take the framework of generalized teleparallel gravity with cylindrically symmetric gravitating object. The matter distribution is represented by locally anisotropic energy-momentum tensor. We develop basic equations such as dynamical equations along with matching conditions and Harrison-Wheeler equation of state. By applying linear perturbation strategy, we construct...
Topic: General Relativity and Quantum Cosmology
Source: http://arxiv.org/abs/1511.03655
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In this work, an effective fermion model with particular higher order interactions given by: $I_{II} = \sum_n^N g_{2^n} (\bar{\psi}_a \psi_a)^{2^n}$, for finite $N$, is investigated by means of the auxiliary field method by taking into account 2$n$-particle states as proposed in Ref. [1]. The bosonized model was found to exhibit an approximate symmetry when expanded for weak field fluctuations around the mean field solutions. In the present work, the role of the mean field solutions for the...
Topics: Nuclear Theory, High Energy Physics - Phenomenology, High Energy Physics - Theory
Source: http://arxiv.org/abs/1511.04365
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by Massimiliano Fasi; Julien Langou; Yves Robert; Bora Ucar
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Several recent papers have introduced a periodic verification mechanism to detect silent errors in iterative solvers. Chen [PPoPP'13, pp. 167--176] has shown how to combine such a verification mechanism (a stability test checking the orthogonality of two vectors and recomputing the residual) with checkpointing: the idea is to verify every $d$ iterations, and to checkpoint every $c \times d$ iterations. When a silent error is detected by the verification mechanism, one can rollback to and...
Topics: Data Structures and Algorithms, Computing Research Repository
Source: http://arxiv.org/abs/1511.04478
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by Li Yao; Nicolas Ballas; Kyunghyun Cho; John R. Smith; Yoshua Bengio
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The task of associating images and videos with a natural language description has attracted a great amount of attention recently. Rapid progress has been made in terms of both developing novel algorithms and releasing new datasets. Indeed, the state-of-the-art results on some of the standard datasets have been pushed into the regime where it has become more and more difficult to make significant improvements. Instead of proposing new models, this work investigates the possibility of empirically...
Topics: Statistics, Computation and Language, Machine Learning, Computing Research Repository, Computer...
Source: http://arxiv.org/abs/1511.04590
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Heterodyne holography is a variant of phase shifting holography in which reference and signal arms are controlled by acousto optic modulators. In this review paper, we will briefy describe the method and its properties, and we will illustrate its advantages in experimental applications.
Topics: Optics, Physics
Source: http://arxiv.org/abs/1511.04257
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We show the existence of a nodal solution with two nodal domains for a generalized Kirchhoff equation of the type $$ -M\left(\displaystyle\int_\Omega \Phi(|\nabla u|)dx\right)\Delta_\Phi u = f(u) \ \ \mbox{in} \ \ \Omega, \ \ u=0 \ \ \mbox{on} \ \ \partial\Omega, $$ where $\Omega$ is a bounded domain in $\mathbf{R}^N$, $M$ is a general $C^{1}$ class function, $f$ is a superlinear $C^{1}$ class function with subcritical growth, $\Phi$ is defined for $t\in \mathbf{R}$ by setting $...
Topics: Analysis of PDEs, Mathematics
Source: http://arxiv.org/abs/1511.04980
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by Michael Geracie; Mikhail Goykhman; Dam T. Son
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In this paper we investigate properties of Chern-Simons theory coupled to massive fermions in the large N limit. We demonstrate that at low temperatures the system is in a Fermi liquid state whose features can be systematically compared to the standard phenomenological theory of Landau Fermi liquids. This includes matching microscopically derived Landau parameters with thermodynamic predictions of Landau Fermi liquid theory. We also calculate the exact conductivity and viscosity tensors at zero...
Topics: Strongly Correlated Electrons, Condensed Matter, High Energy Physics - Theory
Source: http://arxiv.org/abs/1511.04772
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In this paper, we introduce a variation of the notion of topological phase reflecting metric structure of the position space. This framework contains not only periodic and non-periodic systems with symmetries in Kitaev's periodic table but also topological crystalline insulators. We also define the bulk and edge indices as invariants taking values in the twisted equivariant $\mathrm{K}$-groups of Roe algebras as generalizations of existing invariants such as the Hall conductance or the...
Topics: K-Theory and Homology, Mathematical Physics, Mathematics
Source: http://arxiv.org/abs/1511.05314
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by Peter Frankl; Amram Meir; Janos Pach
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Let $d$ be a fixed positive integer and let $\epsilon>0$. It is shown that for every sufficiently large $n\geq n_0(d,\epsilon)$, the $d$-dimensional unit cube can be decomposed into exactly $n$ smaller cubes such that the ratio of the side length of the largest cube to the side length of the smallest one is at most $1+\epsilon$. Moreover, for every $n\geq n_0$, there is a decomposition with the required properties, using cubes of at most $d+2$ different side lengths. If we drop the condition...
Topics: Combinatorics, Mathematics
Source: http://arxiv.org/abs/1511.05301
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by Hideo Suganuma; Naoyuki Sakumichi
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We study the static three-quark (3Q) potential for more than 300 different patterns of 3Q systems with high statistics, i.e., 1000-2000 gauge configurations, in SU(3) lattice QCD at the quenched level. For all the distances, the 3Q potential is found to be well described by the Y-ansatz, i.e., one-gluon-exchange (OGE) Coulomb plus Y-type linear potential. Also, we investigate Abelian projection of quark confinement in the context of the dual superconductor picture proposed by...
Topic: High Energy Physics - Lattice
Source: http://arxiv.org/abs/1511.05244
Arxiv.org
by Yue Sun; Sunseng Pyon; Tsuyoshi Tamegai; Ryo Kobayashi; Tatsuya Watashige; Shigeru Kasahara; Yuji Matsuda; Takasada Shibauchi; Hisashi Kitamura
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In this report, we comprehensively study the effect of H$^+$ irradiation on the critical current density, $J_c$, and vortex pinning in FeSe single crystal. It is found that the value of $J_c$ for FeSe is enhanced more than twice after 3-MeV H$^+$ irradiation. The scaling analyses of the vortex pinning force based on the Dew-Hughes model reveal that the H$^+$ irradiation successfully introduce point pinning centers into the crystal. We also find that the vortex creep rates are strongly...
Topics: Superconductivity, Condensed Matter
Source: http://arxiv.org/abs/1511.05760
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by Pratik Jawanpuria; Maksim Lapin; Matthias Hein; Bernt Schiele
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The paradigm of multi-task learning is that one can achieve better generalization by learning tasks jointly and thus exploiting the similarity between the tasks rather than learning them independently of each other. While previously the relationship between tasks had to be user-defined in the form of an output kernel, recent approaches jointly learn the tasks and the output kernel. As the output kernel is a positive semidefinite matrix, the resulting optimization problems are not scalable in...
Topics: Statistics, Learning, Machine Learning, Computing Research Repository
Source: http://arxiv.org/abs/1511.05706
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As we continue to discover terrestrial exoplanets, many with orbital and planetary characteristics drastically different from anything encountered in our solar system, we are likely to encounter 'exotic' atmospheric transport processes. As an example, we show an analysis of meridional transport from simulations Mars. These simulations provide insight into the differences in meridional transport between Earth and Mars, particularly through the role of a condensation flow. The differences between...
Topics: Astrophysics, Earth and Planetary Astrophysics
Source: http://arxiv.org/abs/1511.06802
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by Enrique Herrero; Ignasi Ribas; Carme Jordi; Juan Carlos Morales; Manuel Perger; Albert Rosich
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Stellar activity patterns are responsible for jitter effects that are observed at different timescales and amplitudes. These effects are currently in the focus of many exoplanet search projects, since the lack of a well-defined characterization and correction strategy hampers the detection of the signals associated with small exoplanets. Accurate simulations of the stellar photosphere can provide synthetic time series data. These may help to investigate the relation between activity jitter and...
Topics: Astrophysics, Earth and Planetary Astrophysics
Source: http://arxiv.org/abs/1511.06717
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by Soren Galatius; Ilya Grigoriev; Oscar Randal-Williams
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We study tautological rings for high dimensional manifolds, that is, for each smooth manifold $M$ the ring $R^*(M)$ of those of characteristic classes of smooth fibre bundles with fibre $M$ which is generated by generalised Miller--Morita--Mumford classes. We completely describe these rings modulo nilpotent elements, when $M$ is a connected sum of copies of $S^n \times S^n$ for $n$ odd.
Topics: Algebraic Topology, Mathematics
Source: http://arxiv.org/abs/1511.06445
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by Fulvio Forni; Alexandre Mauroy; Rodolphe Sepulchre
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The paper shows that normally hyperbolic one-dimensional compact attractors of smooth dynamical systems are characterized by differential positivity, that is, the pointwise infinitesimal contraction of a smooth cone field. The result is analog to the characterization of zero-dimensional hyperbolic attractors by differential stability, which is the pointwise infinitesimal contraction of a Riemannian metric.
Topics: Systems and Control, Dynamical Systems, Computing Research Repository, Mathematics
Source: http://arxiv.org/abs/1511.06996
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by Matthew Anderson; Michael A. Forbes; Ramprasad Saptharishi; Amir Shpilka; Ben Lee Volk
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Read-$k$ oblivious algebraic branching programs are a natural generalization of the well-studied model of read-once oblivious algebraic branching program (ROABPs). In this work, we give an exponential lower bound of $\exp(n/k^{O(k)})$ on the width of any read-$k$ oblivious ABP computing some explicit multilinear polynomial $f$ that is computed by a polynomial size depth-$3$ circuit. We also study the polynomial identity testing (PIT) problem for this model and obtain a white-box...
Topics: Computational Complexity, Computing Research Repository
Source: http://arxiv.org/abs/1511.07136
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This paper investigates the energy-aware virtual machine (VM) allocation problems in clouds along characteristics: multiple resources, fixed interval time and non-preemption of virtual machines. Many previous works have been proposed to use a minimum number of physical machines, however, this is not necessarily a good solution to minimize total energy consumption in the VM placement with multiple resources, fixed interval time and non-preemption. We observed that minimizing the sum of total...
Topics: Performance, Computing Research Repository, Distributed, Parallel, and Cluster Computing
Source: http://arxiv.org/abs/1511.07423
Arxiv.org
by Benjamin Melinand
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This paper is devoted to the study of water waves under the influence of the gravity and the Coriolis force. It is quite common in the physical literature that the rotating shallow water equations are used to study such water waves. We prove a local wellposedness theorem for the water waves equations with vorticity and Coriolis force, taking into account the dependence on various physical parameters and we justify rigorously the shallow water model. We also consider a possible non constant...
Topics: Analysis of PDEs, Mathematics
Source: http://arxiv.org/abs/1511.07407
Arxiv.org
by P. Figueira; V. Zh. Adibekyan; M. Oshagh; J. J. Neal; B. Rojas-Ayala; C. Lovis; C. Melo; F. Pepe; N. C. Santos; M. Tsantaki
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Aims: We evaluate the radial velocity (RV) information content and achievable precision on M0-M9 spectra covering the ZYJHK bands. We do so while considering both a perfect atmospheric transmission correction and discarding areas polluted by deep telluric features, as done in previous works. Methods: To simulate the M-dwarf spectra, PHOENIX-ACES model spectra were employed; they were convolved with rotational kernels and instrumental profiles to reproduce stars with a $v.sin{i}$ of 1.0, 5.0,...
Topics: Astrophysics, Instrumentation and Methods for Astrophysics, Earth and Planetary Astrophysics, Solar...
Source: http://arxiv.org/abs/1511.07468
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by Lenka Kovalcinova; Arnaud Goullet; Lou Kondic
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We consider, computationally and experimentally, the scaling properties of force networks in the systems of circular particles exposed to compression in two spatial dimensions. The simulations consider polydisperse and monodisperse particles, both frictional and frictionless, and in experiments we use monodisperse and bidisperse particles. While for some of the considered systems we observe consistent scaling exponents describing the behavior of the force networks, we find that this behavior is...
Topics: Computational Physics, Soft Condensed Matter, Data Analysis, Statistics and Probability, Condensed...
Source: http://arxiv.org/abs/1511.05556
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by Matej Kuhar; Säm Krucker; Juan Carlos Martínez Oliveros; Marina Battaglia; Lucia Kleint; Diego Casadei; Hugh S. Hudson
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A statistical study of the correlation between hard X-ray and white light emission in solar flares is performed in order to search for a link between flare-accelerated electrons and white light formation. We analyze 43 flares spanning GOES classes M and X using observations from RHESSI (Reuven Ramaty High Energy Solar Spectroscopic Imager) and HMI (Helioseismic and Magnetic Imager). We calculate X-ray fluxes at 30 keV and white light fluxes at 6173 \r{A} summed over the hard X-ray flare ribbons...
Topics: Astrophysics, Solar and Stellar Astrophysics
Source: http://arxiv.org/abs/1511.07757
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by Justin Johnson; Andrej Karpathy; Li Fei-Fei
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We introduce the dense captioning task, which requires a computer vision system to both localize and describe salient regions in images in natural language. The dense captioning task generalizes object detection when the descriptions consist of a single word, and Image Captioning when one predicted region covers the full image. To address the localization and description task jointly we propose a Fully Convolutional Localization Network (FCLN) architecture that processes an image with a single,...
Topics: Learning, Computing Research Repository, Computer Vision and Pattern Recognition
Source: http://arxiv.org/abs/1511.07571
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by Keita Ito; Nicolas Rougemaille; Stefania Pizzini; Syuta Honda; Norio Ota; Takashi Suemasu; Olivier Fruchart
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We investigated head-to-head domain walls in nanostrips of epitaxial $\mathrm{Fe}_4\mathrm{N}(001)$ thin films, displaying a fourfold magnetic anisotropy. Magnetic force microscopy and micromagnetic simulations show that the domain walls have specific properties, compared to soft magnetic materials. In particular, strips aligned along a hard axis of magnetization are wrapped by partial flux-closure concertina domains below a critical width, while progressively transforming to zigzag walls for...
Topics: Materials Science, Condensed Matter, Mesoscale and Nanoscale Physics
Source: http://arxiv.org/abs/1511.07520
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In this paper, we study the dynamics of a two-species competition model with two different free boundaries in heterogeneous time-periodic environment, where the two species adopt a combination of random movement and advection upward or downward along the resource gradient. We show that the dynamics of this model can be classified into four cases, which forms a spreading-vanishing quartering. The notion of the minimal habitat size for spreading is introduced to determine if species can always...
Topics: Analysis of PDEs, Mathematics
Source: http://arxiv.org/abs/1511.07994
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by Sebastian von Hausegger; Hao Liu; Philipp Mertsch; Subir Sarkar
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Cosmology has made enormous progress through studies of the cosmic microwave background, however the subtle signals being now sought such as B-mode polarisation due to primordial gravitational waves are increasingly hard to disentangle from residual Galactic foregrounds in the derived CMB maps. We revisit our finding that on large angular scales there are traces of the nearby old supernova remnant Loop I in the WMAP 9-year map of the CMB and confirm this with the new SMICA map from the Planck...
Topics: Cosmology and Nongalactic Astrophysics, Astrophysics
Source: http://arxiv.org/abs/1511.08207
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by A. I. Bogomazov; M. A. Ibrahimov; B. L. Satovsky; V. S. Kozyreva; T. R. Irsmambetova; V. N. Krushevska; Yu. G. Kuznyetsova; E. R. Gaynullina; R. G. Karimov; Sh. A. Ehgamberdiev; A. V. Tutukov
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We analyse a set of moments of minima of eclipsing variable V0873 Per. V0873 Per is a short period low mass binary star. Data about moments of minima of V0873 Per were taken from literature and our observations during 2013-2014. Our aim is to test the system on existence of new bodies using timing of minima of eclipses. We found the periodical variation of orbital period of V0873 Per. This variation can be explained by the gravitational influence of a third companion on the central binary star....
Topics: Astrophysics, Solar and Stellar Astrophysics
Source: http://arxiv.org/abs/1511.08171
Arxiv.org
by Tyrus Berry; Timothy Sauer
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Density estimation is a crucial component of many machine learning methods, and manifold learning in particular, where geometry is to be constructed from data alone. A significant practical limitation of the current density estimation literature is that methods have not been developed for manifolds with boundary, except in simple cases of linear manifolds where the location of the boundary is assumed to be known. We overcome this limitation by developing a density estimation method for...
Topics: Statistics Theory, Statistics, Classical Analysis and ODEs, Mathematics
Source: http://arxiv.org/abs/1511.08271
Arxiv.org
by V. V. Bobylev; A. T. Bajkova
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We have obtained new estimates of the Sun's distance from the symmetry plane Zo and the vertical disk scale height h using currently available data on stellar OB associations, Wolf-Rayet stars, HII regions, and Cepheids. Based on individual determinations, we have calculated the mean Zo=-16+/-2 pc. Based on the model of a self-gravitating isothermal disk for the density distribution, we have found the following vertical disk scale heights: h = 40.2+/-2.1 pc from OB associations, h = 47.8+/-3.9...
Topics: Astrophysics, Astrophysics of Galaxies
Source: http://arxiv.org/abs/1511.08438
Arxiv.org
by Jingge Zhu; Michael Gastpar
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Given two identical linear codes $\mathcal C$ over $\mathbb F_q$ of length $n$, we independently pick one codeword from each codebook uniformly at random. A $\textit{sumset}$ is formed by adding these two codewords entry-wise as integer vectors and a sumset is called $\textit{typical}$, if the sum falls inside this set with high probability. We ask the question: how large is the typical sumset for most codes? In this paper we characterize the asymptotic size of such typical sumset. We show that...
Topics: Information Theory, Combinatorics, Computing Research Repository, Mathematics
Source: http://arxiv.org/abs/1511.08435
Arxiv.org
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We discuss the role of protostellar outflow feedback in clustered star formation using the observational data of recent molecular outflow surveys toward nearby cluster-forming clumps. We found that for almost all clumps, the outflow momentum injection rate is significantly larger than the turbulence dissipation rate. Therefore, the outflow feedback is likely to maintain supersonic turbulence in the clumps. For less massive clumps such as B59, L1551, and L1641N, the outflow kinetic energy is...
Topics: Astrophysics, Astrophysics of Galaxies, Solar and Stellar Astrophysics
Source: http://arxiv.org/abs/1511.08567
Arxiv.org
by N. S. Simonovic; R. G. Nazmitdinov
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Quantum entanglement is analyzed thoroughly in the case of the ground and lowest states of two-electron axially symmetric quantum dots under a perpendicular magnetic field. The individual-particle and the center-of-mass representations are used to study the entanglement variation at the transition from interacting to noninteracting particle regimes. The mechanism of symmetry breaking due to the interaction, that results in the states with symmetries related to the later representation only,...
Topics: Quantum Physics, Physics, Atomic Physics, Mesoscale and Nanoscale Physics, Condensed Matter
Source: http://arxiv.org/abs/1511.09094
Arxiv.org
by Shang Li; Yun-Feng Liang; Kai-Kai Duan; Zhao-Qiang Shen; Xiaoyuan Huang; Xiang Li; Yi-Zhong Fan; Neng-Hui Liao; Lei Feng; Jin Chang
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Very recently the Dark Energy Survey (DES) Collaboration has released their second group of Dwarf spheroidal (dSph) galaxy candidates. With the publicly-available Pass 8 data of Fermi-LAT we search for $\gamma-$ray emissions from the directions of these eight newly discovered dSph galaxy candidates. No statistically significant $\gamma-$ray signal has been found in the combined analysis of these sources. With the empirically estimated J-factors of these sources, the constraint on the...
Topics: Astrophysics, Cosmology and Nongalactic Astrophysics, High Energy Physics - Phenomenology, High...
Source: http://arxiv.org/abs/1511.09252
Arxiv.org
by Dmitry Tamarkin
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Given a compact symplectic manifold whose symplectic form has integer periods, one associates to it a dg category based on the microlocal analysis according to Kashiwara-Schapira
Topics: Symplectic Geometry, Mathematics
Source: http://arxiv.org/abs/1511.08961