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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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A new proprietary herbomineral formulation was formulated, consisting of essential ingredients viz. herbal root extract ashwagandha and minerals (zinc, magnesium, and selenium). The aim of the study was to evaluate the immunomodulatory potential of Consciousness Energy Healing Treatment on the herbomineral formulation in male Sprague Dawley rats. The test formulation was divided into two parts. One part was denoted as the control without any Biofield Energy Treatment, while the other part was...
Topics: The Trivedi Effect®, Biofield Energy Healers, Autoimmunity, Ant-aging, Alzheimer’s Disease
Source: http://academictorrents.com/details/42f8a4cae4286dc1f493a999a70bfac037673f5b
Arxiv.org
by Xiao-Jun Yang; Feng Gao; J. A. Tenreiro Machado; Dumitru Baleanu
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In this paper, a new fractional derivative involving the normalized sinc function without singular kernel is proposed. The Laplace transform is used to find the analytical solution of the anomalous heat-diffusion problems. The comparative results between classical and fractional-order operators are presented. The results are significant in the analysis of one-dimensional anomalous heat-transfer problems.
Topics: Classical Analysis and ODEs, Mathematics
Source: http://arxiv.org/abs/1701.05590
Arxiv.org
by Edoardo Sernesi
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We consider a general primitively polarized K3 surface $(S,H)$ of genus $g+1$ and a 1-nodal curve $\widetilde C\in |H|$. We prove that the normalization $C$ of $\widetilde C$ has surjective Wahl map provided $g=40,42$ or $\ge 44$.
Topics: Algebraic Geometry, Mathematics
Source: http://arxiv.org/abs/1701.04801
Arxiv.org
by Siwar Jendoubi; Arnaud Martin; Ludovic Liétard; Ben Hend; Ben Boutheina
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Influence maximization is the problem of selecting a set of influential users in the social network. Those users could adopt the product and trigger a large cascade of adoptions through the " word of mouth " effect. In this paper, we propose two evidential influence maximization models for Twitter social network. The proposed approach uses the theory of belief functions to estimate users influence. Furthermore, the proposed influence estimation measure fuses many influence aspects in...
Topics: Computing Research Repository, Social and Information Networks
Source: http://arxiv.org/abs/1701.05751
Arxiv.org
by Misaki Mizumoto; Ken Ebisawa
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The Narrow-line Seyfert 1 galaxy NGC 4051 is known to exhibit significant X-ray spectral/flux variations and have a number of emission/absorption features. X-ray observations have revealed that these absorption features are blueshifted, which indicates that NGC 4051 has warm absorber outflow. In order to constrain physical parameters of the warm absorber outflow, we analyze the archival data with the longest exposure taken by XMM-Newton in 2009. We calculate the root-mean-square (RMS) spectra...
Topics: Astrophysics, High Energy Astrophysical Phenomena
Source: http://arxiv.org/abs/1701.06298
Arxiv.org
by Kai-Wen Li; Xiu-Lei Ren; Li-Sheng Geng; Bingwei Long
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A recently proposed covariant chiral effective field theory approach is applied to study strangeness $S=-1$ hyperon-nucleon interactions at leading order. 12 low energy constants are introduced by Lorentz invariance, which is different from the heavy baryon approach, where only five appear. The Kadyshevsky equation is employed to iterate the chiral potentials. A quite satisfactory description of the 36 hyperon-nucleon scattering data is obtained with $\chi^2\simeq 17$, which is comparable with...
Topic: Nuclear Theory
Source: http://arxiv.org/abs/1701.06272
Arxiv.org
by Carolyn A. Kierans; Steven E. Boggs; Jeng-Lun Chiu; Alex Lowell; Clio Sleator; John A. Tomsick; Andreas Zoglauer; Mark Amman; Hsiang-Kuang Chang; Chao-Hsiung Tseng; Chien-Ying Yang; Chih-Hsun Lin; Pierre Jean; Peter von Ballmoos
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The Compton Spectrometer and Imager (COSI) is a balloon-borne, soft-gamma ray imager, spectrometer, and polarimeter with sensitivity from 0.2 to 5 MeV. Utilizing a compact Compton telescope design with twelve cross-strip, high-purity germanium detectors, COSI has three main science goals: study the 511 keV positron annihilation line from the Galactic plane, image diffuse emission from stellar nuclear lines, and perform polarization studies of gamma-ray bursts and other extreme astrophysical...
Topics: High Energy Astrophysical Phenomena, Instrumentation and Methods for Astrophysics, Astrophysics
Source: http://arxiv.org/abs/1701.05558
Arxiv.org
by J. P. Sheckelton; K. W. Plumb; B. A. Trump; C. L. Broholm; T. M. McQueen
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Insulating Nb$_3$Cl$_8$ is a layered chloride consisting of two-dimensional triangular layers of $S_{eff}$ = 1/2 Nb$_3$Cl$_{13}$ clusters at room temperature. Magnetic susceptibility measurement show a sharp, hysteretic drop to a temperature independent value below $T = 90$ K. Specific heat measurements show that the transition is first order, with $\Delta S \approx 5\ \mathrm{J \cdot K^{-1} \cdot mol\ \mathit{f.u.}^{-1}}$, and a low temperature $T$-linear contribution originating from defect...
Topics: Strongly Correlated Electrons, Materials Science, Condensed Matter
Source: http://arxiv.org/abs/1701.05528
Arxiv.org
by Kolja Knauer; Tilen Marc
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We give two graph theoretical characterizations of tope graphs of (complexes of) oriented matroids. The first is in terms of excluded partial cube minors, the second is that all antipodal subgraphs are gated. A direct consequence is a third characterization in terms of zone graphs of tope graphs. Further corollaries include a characterization of topes of oriented matroids due to da Silva, another one of Handa, a characterization of lopsided systems due to Lawrence, and an intrinsic...
Topics: Discrete Mathematics, Combinatorics, Computing Research Repository, Mathematics
Source: http://arxiv.org/abs/1701.05525
Arxiv.org
by Xiaoxiao Yang; Joost-Pieter Katoen; Huimin Lin; Hao Wu
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The verification of linearizability -- a key correctness criterion for concurrent objects -- is based on trace refinement whose checking is PSPACE-complete. This paper suggests to use \emph{branching} bisimulation instead. Our approach is based on comparing an abstract specification in which object methods are executed atomically to a real object program. Exploiting divergence sensitivity, this also applies to progress properties such as lock-freedom. These results enable the use of...
Topics: Programming Languages, Computing Research Repository
Source: http://arxiv.org/abs/1701.06104
Arxiv.org
by Stanislav Volgushev; Shih-Kang Chao; Guang Cheng
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The increased availability of massive data sets provides a unique opportunity to discover subtle patterns in their distributions, but also imposes overwhelming computational challenges. To fully utilize the information contained in big data, we propose a two-step procedure: (i) estimate conditional quantile functions at different levels in a parallel computing environment; (ii) construct a conditional quantile regression process through projection based on these estimated quantile curves. Our...
Topics: Statistics Theory, Statistics, Methodology, Mathematics
Source: http://arxiv.org/abs/1701.06088
Arxiv.org
by Li Chen; Israel Michael Sigal
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We consider the Bogolubov-de Gennes equations giving an equivalent formulation of the BCS theory of superconductivity. We are interested in the case when the magnetic field is present. We (a) discuss their general features, (b) isolate key physical classes of solutions (normal, vortex and vortex lattice states) and (c) prove existence of the normal, vortex and vortex lattice states and stability/instability of the normal states for large/small temperature or/and magnetic fields.
Topics: Mathematical Physics, Mathematics
Source: http://arxiv.org/abs/1701.06080
Arxiv.org
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For two Banach algebras $A$ and $B$, the $T$-Lau product $A\times_T B$, was recently introduced and studied for some bounded homomorphism $T:B\to A$ with $\|T\|\leq 1$. Here, we give general nessesary and sufficent conditions for $A\times_T B$ to be (approximately) cyclic amenable. In particular, we extend some recent results on (approximate) cyclic amenability of direct product $A\oplus B$ and $T$-Lau product $A\times_T B$ and answer a question on cyclic amenability of $A\times_T B$.
Topics: Functional Analysis, Mathematics
Source: http://arxiv.org/abs/1701.06056
Arxiv.org
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This article gives an overview of gamma-ray bursts (GRBs) and their relation to astroparticle physics and cosmology. GRBs are the most powerful explosions in the universe that occur roughly once per day and are characterized by flashes of gamma-rays typically lasting from a fraction of a second to thousands of seconds. Even after more than four decades since their discovery they still remain not fully understood. Two types of GRBs are observed: spectrally harder short duration bursts and softer...
Topics: Astrophysics, High Energy Astrophysical Phenomena
Source: http://arxiv.org/abs/1701.06058
Arxiv.org
by Darka Labavić; Hildegard Meyer-Ortmanns
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We analyze repulsively coupled Kuramoto oscillators, which are exposed to a distribution of natural frequencies. This source of disorder leads to closed orbits with a variety of different periods, which can be orders of magnitude longer than periods of individual oscillators. By construction the attractor space is quite rich. This may cause long transients until the deterministic trajectories find their stationary orbits. The smaller the width of the distribution about the common natural...
Topics: Nonlinear Sciences, Adaptation and Self-Organizing Systems
Source: http://arxiv.org/abs/1701.06889
Arxiv.org
by Misael Avendano-Camacho; Peter D. Hislop; Carlos Villegas-Blas
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We prove a limiting eigenvalue distribution theorem (LEDT) for suitably scaled eigenvalue clusters around the discrete negative eigenvalues of the hydrogen atom Hamiltonian formed by the perturbation by a weak constant magnetic field. We study the hydrogen atom Zeeman Hamiltonian $H_V(h,B) = (1/2)( - i h {\mathbf \nabla} - {\mathbf A}(h))^2 - |x|^{-1}$, defined on $L^2 (R^3)$, in a constant magnetic field ${\mathbf B}(h) = {\mathbf \nabla} \times {\mathbf A}(h)=(0,0,\epsilon(h)B)$ in the weak...
Topics: Spectral Theory, Mathematical Physics, Mathematics
Source: http://arxiv.org/abs/1701.06866
Arxiv.org
by Urjit A. Yajnik
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In the year 1900 Max Planck was led by experimental observations to propose a strange formula for the intensity as a function of frequency for light emitted by a cavity. It relied on peculiar properties to be obeyed by the emitters and absorbers in the cavity. I highlight the mathematically suggestive nature of the formula, accessible even to a high school student, that could have provided a clue to the physical reasoning of Planck. In 1905, Einstein made the bold photon hypothesis and was able...
Topics: History and Philosophy of Physics, Physics
Source: http://arxiv.org/abs/1701.06867
Arxiv.org
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Hybrid Morphology Radio Sources (HyMoRS) are a class of radio galaxies having the lobe morphology of a Fanaroff-Riley (FR) type I on one side of the active nucleus and of a FR type II on the other. The origin of the different morphologies between FR I and FR II sources has been widely discussed in the past 40 years, and HyMoRS may be the best way to understand whether this dichotomy is related to the intrinsic nature of the source and/or to its environment. However, these sources are extremely...
Topics: Astrophysics of Galaxies, Astrophysics, Cosmology and Nongalactic Astrophysics
Source: http://arxiv.org/abs/1701.06915
Arxiv.org
by A. Sadowski; M. Gaspari
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We perform a set of general relativistic, radiative, magneto-hydrodynamical simulations (GR-RMHD) to study the transition from radiatively inefficient to efficient state of accretion on a non-rotating black hole. We study ion to electron temperature ratios ranging from $T_{\rm i}/T_{\rm e}=10$ to $100$, and simulate flows corresponding to accretion rates as low as $10^{-6}\dot M_{\rm Edd}$, and as high as $10^{-2}\dot M_{\rm Edd}$. We have found that the radiative output of accretion flows...
Topics: Physics, Astrophysics, Astrophysics of Galaxies, High Energy Astrophysical Phenomena, Computational...
Source: http://arxiv.org/abs/1701.07033
Arxiv.org
by Takuya Takahashi
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Flare associated coronal shock waves sometimes interact with solar prominences leading to large amplitude prominence oscillations. Such prominence activation gives us unique opportunity to track time evolution of shock-cloud interaction in cosmic plasmas. Although the dynamics of interstellar shock-cloud interaction is extensively studied, coronal shock-solar prominence interaction is rarely studied in the context of shock-cloud interaction. Associated with X5.4 class solar flare occurred on 7...
Topics: Solar and Stellar Astrophysics, Astrophysics
Source: http://arxiv.org/abs/1701.07001
In this paper we demonstrate a connection between the roots of a certain sequence of orthogonal polynomials on the real line and the linear instability of a $x$-directionally homogeneous background velocity profile $u^b(x,y) = \cos(y)$ in the quasi-geostrophic shallow water (QG) equation in a domain with periodic boundaries in the $y$-direction. Using the relationship we establish, we then prove that there exists a unique unstable mode for each horizontal wave number $0
Topics: Mathematical Physics, Mathematics
Source: http://arxiv.org/abs/1701.07048
Arxiv.org
by Askar Tuganbaev
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$\textbf{Theorem 1.2.}$ For a ring $A$, the following conditions are equivalent. $\textbf{1)}$ $A$ is a right automorphism-invariant right non-singular ring. $\textbf{2)}$ $A$ is a right automorphism-invariant regular ring. $\textbf{3)}$ $A=S\times T$, where $S$ is a right injective regular ring and $T$ is a strongly regular ring which contains all invertible elements of its maximal right ring of quotients. $\textbf{Theorem 1.5.}$ For a ring $A$ with right Goldie radical $G(A_A)$, the following...
Topics: Rings and Algebras, Mathematics
Source: http://arxiv.org/abs/1701.07116
Arxiv.org
by Klaus Hueck; Niclas Luick; Lennart Sobirey; Jonas Siegl; Thomas Lompe; Henning Moritz; Logan W. Clark; Cheng Chin
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Absorption imaging of ultracold atoms is the foundation for quantitative extraction of information from experiments with ultracold atoms. Due to the limited exposure time available in these systems, the signal-to-noise ratio is largest for high intensity absorption imaging where the intensity of the imaging light is on the order of the saturation intensity. In this case, the absolute value of the intensity of the imaging light enters as an additional parameter making it more sensitive to...
Topics: Quantum Gases, Condensed Matter
Source: http://arxiv.org/abs/1702.01943
Arxiv.org
by Tanushri Chakravorty; Guillaume-Alexandre Bilodeau; Eric Granger
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In this paper, an online adaptive model-free tracker is proposed to track single objects in video sequences to deal with real-world tracking challenges like low-resolution, object deformation, occlusion and motion blur. The novelty lies in the construction of a strong appearance model that captures features from the initialized bounding box and then are assembled into anchor-point features. These features memorize the global pattern of the object and have an internal star graph-like structure....
Topics: Computing Research Repository, Computer Vision and Pattern Recognition
Source: http://arxiv.org/abs/1702.02012
Arxiv.org
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In this paper we prove that given two sets $E_1,E_2 \subset \mathbb{Z}$ of positive density, there exists $k \geq 1$ which is bounded by a number depending only on the densities of $E_1$ and $E_2$ such that $k\mathbb{Z} \subset (E_1-E_1)\cdot(E_2-E_2)$. As a corollary of the main theorem we deduce that if $\alpha,\beta > 0$ then there exist $N_0$ and $d_0$ which depend only on $\alpha$ and $\beta$ such that for every $N \geq N_0$ and $E_1,E_2 \subset \mathbb{Z}_N$ with $|E_1| \geq \alpha N,...
Topics: Dynamical Systems, Combinatorics, Number Theory, Mathematics
Source: http://arxiv.org/abs/1702.02544
Arxiv.org
by Shamit Kachru; Arnav Tripathy
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We propose that Borcherds' Fake Monster Lie algebra is a broken symmetry of heterotic string theory compactified on $T^7 \times T^2$. As evidence, we study the fully flavored counting function for BPS instantons contributing to a certain loop amplitude. The result is controlled by $\Phi_{12}$, an automorphic form for $O(2, 26, \mathbb{Z})$. The degeneracies it encodes in its Fourier coefficients are graded dimensions of a second-quantized Fock space for this large symmetry algebra. This...
Topics: High Energy Physics - Theory, Quantum Algebra, Representation Theory, Mathematics
Source: http://arxiv.org/abs/1702.02572
Arxiv.org
by Yuanjie Wang; Martin Haenggi; Zhenhui Tan
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The meta distribution of the signal-to-interference ratio (SIR) provides fine-grained information about the performance of individual links in a wireless network. This paper focuses on the analysis of the meta distribution of the SIR for both the cellular network uplink and downlink with fractional power control. For the uplink scenario, an approximation of the interfering user point process with a non-homogeneous Poisson point process is used. The moments of the meta distribution for both...
Topics: Networking and Internet Architecture, Information Theory, Computing Research Repository, Mathematics
Source: http://arxiv.org/abs/1702.01864
Arxiv.org
by Hernan Villanueva; Kurt Maute
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This paper studies the characteristics and applicability of the CutFEM approach as the core of a robust topology optimization framework for 3D laminar incompressible flow and species transport problems at low Reynolds number (Re < 200). CutFEM is a methodology for discretizing partial differential equations on complex geometries by immersed boundary techniques. In this study, the geometry of the fluid domain is described by an explicit level set method, where the parameters of a level set...
Topics: Optimization and Control, Systems and Control, Computing Research Repository, Mathematics
Source: http://arxiv.org/abs/1702.02473
Arxiv.org
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In the Any-Angle Pathfinding problem, the goal is to find the shortest path between a pair of vertices on a uniform square grid, that is not constrained to any fixed number of possible directions over the grid. Visibility Graphs are a known optimal algorithm for solving the problem with the use of pre-processing. However, Visibility Graphs are known to perform poorly in terms of running time, especially on large, complex maps. In this paper, we introduce two improvements over the Visibility...
Topics: Computational Geometry, Computing Research Repository
Source: http://arxiv.org/abs/1702.01524
Arxiv.org
by L. S. Aramyan; A. A. Hakobyan; A. R. Petrosian; V. de Lapparent; E. Bertin; G. A. Mamon; D. Kunth; T. A. Nazaryan; V. Adibekyan; M. Turatto
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Using a sample of 215 supernovae (SNe), we analyse their positions relative to the spiral arms of their host galaxies, distinguishing grand-design (GD) spirals from non-GD (NGD) galaxies. Our results suggest that shocks in spiral arms of GD galaxies trigger star formation in the leading edges of arms affecting the distributions of core-collapse (CC) SNe (known to have short-lived progenitors). The closer locations of SNe Ibc vs. SNe II relative to the leading edges of the arms supports the...
Topics: Astrophysics of Galaxies, Astrophysics
Source: http://arxiv.org/abs/1702.01580
Arxiv.org
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In this article, we study the behavior of consecutive values of random completely multiplicative functions $(X_n)_{n \geq 1}$ whose values are i.i.d. at primes. We prove that for $X_2$ uniform on the unit circle, or uniform on the set of roots of unity of a given order, and for fixed $k \geq 1$, $X_{n+1}, \dots, X_{n+k}$ are independent if $n$ is large enough. Moreover, with the same assumption, we prove the almost sure convergence of the empirical measure $N^{-1} \sum_{n=1}^N \delta_{(X_{n+1},...
Topics: Probability, Number Theory, Mathematics
Source: http://arxiv.org/abs/1702.01470
Arxiv.org
by R. Casana; M. L. Dias; E. da Hora
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We study time-independent radially symmetric first-order solitons in a CP(2) model interacting with an Abelian gauge field whose dynamics is controlled by the usual Maxwell term. In this sense, we develop a consistent first-order framework verifying the existence of a well-defined lower bound for the corresponding energy. We saturate such a lower bound by focusing on those solutions satisfying a particular set of coupled first-order differential equations. We solve these equations numerically...
Topics: High Energy Physics - Theory, Pattern Formation and Solitons, Nonlinear Sciences
Source: http://arxiv.org/abs/1702.02917
In the present paper we propose to update the standard calculation of Stark line profiles for autoionizing atomic states in dense plasmas, i.e. warm dense matter and strongly coupled plasmas. This is motivated by the importance of taking into account the effect of the electric microfield generated by the plasma charge constituents in the calculation of the atomic populations of autoionizing states which leads to the modification of the calculation of Stark line profiles in the frame of the...
Topics: Plasma Physics, Physics
Source: http://arxiv.org/abs/1702.02940
Arxiv.org
by Yuri Kondratiev; Yuri Kozitsky
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We study the Markov dynamics of an infinite birth-and-death system of point entities placed in $\mathbb{R}^d$, in which the constituents disperse and die, also due to competition. Assuming that the dispersal and competition kernels are just continuous and integrable we prove that the evolution of states of this model preserves their sub-Poissonicity, and hence the local self-regulation (suppression of clustering) takes place. Upper bounds for the correlation functions of all orders are also...
Topics: Dynamical Systems, Mathematical Physics, Mathematics
Source: http://arxiv.org/abs/1702.02920
Arxiv.org
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We present synthetic continuum and $^{13}$CO and C$^{18}$O line emission observations of dense and cold filaments. The filaments are dynamically evolved using 3D-MHD simulations that include one of the largest on-the-fly chemical networks used to date, which models the detailed evolution of H$_2$ and CO. We investigate the reliability of observable properties, in particular filament mass and width, under different simulation conditions like magnetic field orientation and cosmic ray ionisation...
Topics: Astrophysics of Galaxies, Solar and Stellar Astrophysics, Astrophysics
Source: http://arxiv.org/abs/1702.03227
Arxiv.org
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Recently, we have a confidence that neutrino has a tiny mass and mixing does exist among neutrino flovors as one can see from experimental data that reported by many collaborations. Based on experimental data that flavor mixing does exist in neutrino sector which imply that all three mixing angles are nonzero, we derive the neutrino mass matrix from a cobimaximal neutrino mixing matrix. We also evaluate the prediction of neutrino mass matrix with texture zero from a cobimaximal neutrino mixing...
Topics: Physics, High Energy Physics - Phenomenology, General Physics
Source: http://arxiv.org/abs/1702.03214
Arxiv.org
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We present the new developments in the physics of XYZ mesons and glueballs and discuss the connection between properties of the $XYZ$ mesons and glueballs, and the structure of the QCD vacuum. It is shown that the mixing between quark and gluon degree of freedoms induced by the nontrivial topological structure of the QCD vacuum might affect strongly the properties of the exotic hadrons. A new interpretation of the $XYZ$ mesons as the mixing between radial excitations of light quark-antiquark...
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1702.03047
Arxiv.org
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Opportunity detection at secondary transmitters (TXs) is a key technique enabling cognitive radio (CR) networks. Such detection however cannot guarantee reliable communication at secondary receivers (RXs), especially when their association distance is long. To cope with the issue, this paper proposes a novel MAC called sense-and-predict (SaP), where each secondary TX decides whether to access or not based on the prediction of the interference level at RX. Firstly, we provide the spatial...
Topics: Information Theory, Computing Research Repository, Mathematics
Source: http://arxiv.org/abs/1702.03507
Arxiv.org
by Diego López González; Yasuhiro Shirahata; Ben Van de Wiele; Kévin J. A. Franke; Arianna Casiraghi; Tomoyasu Taniyama; Sebastiaan van Dijken
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We report on reversible electric-field-driven magnetic domain wall motion in a Cu/Ni multilayer on a ferroelectric BaTiO$_3$ substrate. In our heterostructure, strain-coupling to ferroelastic domains with in-plane and perpendicular polarization in the BaTiO$_3$ substrate causes the formation of domains with perpendicular and in-plane magnetic anisotropy, respectively, in the Cu/Ni multilayer. Walls that separate magnetic domains are elastically pinned onto ferroelectric domain walls. Using...
Topics: Materials Science, Condensed Matter
Source: http://arxiv.org/abs/1702.03553
Arxiv.org
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In this paper, we demonstrate the fragility of decentralized load-side frequency algorithms proposed in [1] against stochastic parametric uncertainty in power network model. The stochastic parametric uncertainty is motivated through the presence of renewable energy resources in power system model. We show that relatively small variance value of the parametric uncertainty affecting the system bus voltages cause the decentralized load-side frequency regulation algorithm to become stochastically...
Topics: Optimization and Control, Systems and Control, Computing Research Repository, Mathematics
Source: http://arxiv.org/abs/1702.03477
Arxiv.org
by John F. R. Duncan; Michael H. Mertens; Ken Ono
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Answering a question posed by Conway and Norton in their seminal 1979 paper on moonshine, we prove the existence of a graded infinite-dimensional module for the sporadic simple group of O'Nan, for which the McKay--Thompson series are weight $3/2$ mock modular forms. These series are linear combinations of generating functions for traces of singular moduli, class numbers, and central critical values of quadratic twists of weight 2 modular $L$-functions. As a consequence, for primes $p$ dividing...
Topics: Number Theory, Representation Theory, Mathematics
Source: http://arxiv.org/abs/1702.03516
Arxiv.org
by Ahmed Saeed; Ahmed Abdelkader; Mouhyemen Khan; Azin Neishaboori; Khaled A. Harras; Amr Mohamed
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Low-cost mini-drones with advanced sensing and maneuverability enable a new class of intelligent sensing systems. This trend motivated several research efforts to employ drones as standalone systems or to assist legacy deployments. However, several fundamental challenges remain unsolved including: 1) Adequate coverage of sizable targets; 2) Target orientation that render coverage effective only from certain view points; 3) Occlusion by elements in the environment, including other targets. In...
Topics: Computing Research Repository, Robotics
Source: http://arxiv.org/abs/1702.03456
Arxiv.org
by Xuan Zhang; Wenbo Shi; Bin Yan; Ali Malkawi; Na Li
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In this paper, we design real-time decentralized and distributed control schemes for Heating Ventilation and Air Conditioning (HVAC) systems in energy efficient buildings. The control schemes balance user comfort and energy saving, and are implemented without measuring or predicting exogenous disturbances. Firstly, we introduce a thermal dynamic model of building systems and formulate a steady-state resource allocation problem, which aims to minimize the aggregate deviation between zone...
Topics: Systems and Control, Computing Research Repository
Source: http://arxiv.org/abs/1702.03308
Arxiv.org
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This paper presents the three scripting commands and main functionalities of a novel character animation environment called CHASE. CHASE was developed for enabling inexperienced programmers, animators, artists, and students to animate in meaningful ways virtual reality characters. This is achieved by scripting simple commands within CHASE. The commands identified, which are associated with simple parameters, are responsible for generating a number of predefined motions and actions of a...
Topics: Computing Research Repository, Graphics
Source: http://arxiv.org/abs/1702.03246
Arxiv.org
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The Center for Axion and Precision Physics Research (CAPP) was founded in 2013, with the ambition of shedding light on the strong CP problem and the proposed existence of axions. Much of CAPP's effort focuses on the direct detection of dark matter candidate axions with a series of local haloscope experiments, which endeavour to expand dramatically the coverage on the "invisible axion" mass range. The first two of them plan experimental runs during this year, tapping into ultra-low...
Topics: Physics, High Energy Physics - Experiment, Instrumentation and Detectors
Source: http://arxiv.org/abs/1702.03664
Arxiv.org
by Oliver Knill
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A finite abstract simplicial complex G defines two finite simple graphs: the Barycentric refinement G1, connecting two simplices if one is a subset of the other and the connection graph G', connecting two simplices if they intersect. We prove that the Poincare-Hopf value i(x)=1-X(S(x)), where X is Euler characteristics and S(x) is the unit sphere of a vertex x in G1, agrees with the Green function value g(x,x),the diagonal element of the inverse of (1+A'), where A' is the adjacency matrix of...
Topics: Discrete Mathematics, Rings and Algebras, General Topology, Computing Research Repository,...
Source: http://arxiv.org/abs/1702.03606
Arxiv.org
by Richard Kenyon
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We generalize the uniform spanning tree to construct a family of determinantal measures on essential spanning forests on periodic planar graphs in which every component tree is bi-infinite. Like the uniform spanning tree, these measures arise naturally from the laplacian on the graph. More generally these results hold for the "massive" laplacian determinant which counts rooted spanning forests with weight $M$ per finite component. These measures typically have a form of conformal...
Topics: Probability, Mathematics
Source: http://arxiv.org/abs/1702.03802
Arxiv.org
by R. Doroshenko; A. Santangelo; V. Doroshenko; S. Piraino
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We report on the BeppoSAX monitoring of a giant outburst of the transient X-ray pulsar XTE J1946+274 in 1998. The source was detected with a flux of ~ 4 x 10^(-9) erg cm^(-2) s^(-1) (in 0.1 - 120 keV range). The broadband spectrum, typical for accreting pulsars, is well described by a cutoff power law with a cyclotron resonance scattering feature (CRSF) at ~ 38 keV. This value is consistent with earlier reports based on the observations with Suzaku at factor of ten lower luminosity, which...
Topics: Astrophysics, High Energy Astrophysical Phenomena
Source: http://arxiv.org/abs/1702.03805
Arxiv.org
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We present a multi-wavelength timing study of the eclipsing low mass X-ray binary EXO 0748-676 (UY Vol) using XMM-Newton when the source was in a hard spectral state. The orbital optical and X-ray light curves show a fairly large amount of intensity modulation in the 7 observations taken during September-November, 2003, covering 36 complete binary orbits of EXO 0748-676. While assessing the non-burst variability, simultaneously in the optical and X-ray light curves, we find that they are not...
Topics: Astrophysics, High Energy Astrophysical Phenomena
Source: http://arxiv.org/abs/1702.03719
Arxiv.org
by Shou-Jun Huang; K. R. Rajagopal; Hui-Hui Dai
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Recently there has been interest in studying a new class of elastic materials, which is described by implicit constitutive relations. Under some basic assumption for elasticity constants, the system of governing equations of motion for this elastic material is strictly hyperbolic but without the convexity property. In this paper, all wave patterns for the nonclassic nonlinearly elastic materials under Riemann data are established completely by separating the phase plane into twelve disjoint...
Topics: Analysis of PDEs, Mathematics
Source: http://arxiv.org/abs/1702.04083
Arxiv.org
by Danny Hermelin; Michael Segal; Harel Yedidsion
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In this paper, we study the problem of wireless sensor network (WSN) maintenance using mobile entities called mules. The mules are deployed in the area of the WSN in such a way that would minimize the time it takes them to reach a failed sensor and fix it. The mules must constantly optimize their collective deployment to account for occupied mules. The objective is to define the optimal deployment and task allocation strategy for the mules, so that the sensors' downtime and the mules' traveling...
Topics: Networking and Internet Architecture, Computing Research Repository
Source: http://arxiv.org/abs/1702.04142
Arxiv.org
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The density-matrix-renormalization-group (DMRG) method and the Hartree-Fock (HF) approximation with the charge-density-wave (CDW) instability are used to study a formation and condensation of excitonic bound states in the generalized Falicov-Kimball model. In particular, we examine effects of various factors, like the $f$-electron hopping, the local and nonlocal hybridization, as well as the increasing dimension of the system on the excitonic momentum distribution $N(q)$ and especially on the...
Topics: Strongly Correlated Electrons, Condensed Matter
Source: http://arxiv.org/abs/1702.04167
Arxiv.org
by J. E. Isomurodov; K. P. Kokhas
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We present two sets of 12 integers that have the same sets of 4-sums. The proof of the fact that a set of 12 numbers is uniquely determined by the set of its 4-sums published 50 years ago is wrong, and we demonstrate an incorrect calculation in it.
Topics: Number Theory, Combinatorics, Mathematics
Source: http://arxiv.org/abs/1702.04166
Recent work on recurrence in quantum walks has provided a representation of Schur functions in terms of unitary operators. We propose a generalization of Schur functions by extending this operator representation to arbitrary operators on Banach spaces. Such generalized Schur functions meet the formal structure of first return generating functions, thus we call them FR-functions. We derive general properties of FR-functions, among them a generalization of the renewal equation already known for...
Topics: Classical Analysis and ODEs, Probability, Quantum Physics, Functional Analysis, Mathematics
Source: http://arxiv.org/abs/1702.04032
Arxiv.org
by Loic Herviou; Christophe Mora; Karyn Le Hur
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Bipartite charge fluctuations (BCF) have been introduced to provide an experimental indication of many-body entanglement. They have proved themselves to be a very efficient and useful tool to characterize quantum phase transitions in a variety of quantum models conserving the total number of particles (or magnetization for spin systems). In this Letter, we study the BCF in generic one-dimensional $\mathbb{Z}_2$ (topological) models including the Kitaev superconducting wire model, the Ising...
Topics: Strongly Correlated Electrons, Condensed Matter, Mesoscale and Nanoscale Physics, Superconductivity
Source: http://arxiv.org/abs/1702.03966
Arxiv.org
by J. M. H. Kroes; A. Fasolino; M. I. Katsnelson
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Using density functional theory, we study proton permeation through graphene and hexagonal boron nitride. We consider several factors influencing the barriers for permeation, including structural optimization, the role of the solvent, surface curvature and proton transport through hydrogenated samples. Furthermore, we discuss the ground state charge transfer from the membrane to the proton and the strong tendency for bond formation. If the process is assumed to be slow we find that none of...
Topics: Mesoscale and Nanoscale Physics, Condensed Matter
Source: http://arxiv.org/abs/1702.03813
Arxiv.org
by D. Bazeia; M. B. P. N. Pereira; A. V. Brito; B. F. de Oliveira; J. G. G. S. Ramos
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We demonstrate the presence of chaos in stochastic simulations that are widely used to study biodiversity in nature. The investigation deals with a set of three distinct species that evolve according to the standard rules of mobility, reproduction and predation, with predation following the cyclic rules of the popular rock, paper and scissors game. The study uncovers the possibility to distinguish between time evolutions that start from slightly different initial states, guided by the Hamming...
Topics: Physics, Condensed Matter, Biological Physics, Nonlinear Sciences, Statistical Mechanics,...
Source: http://arxiv.org/abs/1702.04438
Arxiv.org
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Causal inference has received great attention across different fields from economics, statistics, education, medicine, to machine learning. Within this area, inferring causal effects at individual level in observational studies has become an important task, especially in high dimensional settings. In this paper, we propose a framework for estimating Individualized Treatment Effects in high-dimensional non-experimental data. We provide both theoretical and empirical justifications, the latter by...
Topics: Statistics, Methodology
Source: http://arxiv.org/abs/1702.04473
Arxiv.org
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We have examined the origin of the electronic structure changes as a function of the number of layers in transition metal dichalcogenides (MX$_2$, where M=Mo,W and X=S,Se and Te). The belief has been that both geometric confinement effects as well as interlayer interactions play an important role in determining the electronic structure of transition metal dichalcogenide layers as the thickness is varied. By carrying out a mapping onto a tight binding model, we show that the evolution in the...
Topics: Materials Science, Mesoscale and Nanoscale Physics, Condensed Matter
Source: http://arxiv.org/abs/1702.04535
Arxiv.org
by Kaipeng Li; Rishi Sharan; Yujun Chen; Tom Goldstein; Joseph R. Cavallaro; Christoph Studer
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Achieving high spectral efficiency in realistic massive multi-user (MU) multiple-input multiple-output (MIMO) wireless systems requires computationally-complex algorithms for data detection in the uplink (users transmit to base station) and beamforming in the downlink (base station transmits to users). Most existing algorithms are designed to be executed on centralized computing hardware at the base station (BS), which both results in prohibitive complexity for systems with hundreds or...
Topics: Information Theory, Computing Research Repository, Mathematics
Source: http://arxiv.org/abs/1702.04458
Arxiv.org
by Jacob Carruth; Felipe Gonçalves; Michael Kelly
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In this paper we investigate a high dimensional version of Selberg's minorant problem for the indicator function of an interval. In particular, we study the corresponding problem of minorizing the indicator function of the box $Q_{N}=[-1,1]^N$ by a function whose Fourier transform is supported in the same box $Q_N$. We show that when $N$ is sufficiently large there are no non-trivial minorants (that is, minorants with positive integral). On the other hand, we explicitly construct non-trivial...
Topics: Classical Analysis and ODEs, Functional Analysis, Number Theory, Mathematics
Source: http://arxiv.org/abs/1702.04579
Arxiv.org
by Javier Alejandro Chávez-Domínguez
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We prove a version of the Ando-Choi-Effros lifting theorem respecting subspaces, which in turn relies on Oja's principle of local reflexivity respecting subspaces. To achieve this, we first develop a theory of pairs of $M$-ideals. As a first consequence we get a version respecting subspaces of the Michael-Pe{\l}czy\'nski extension theorem. Other applications are related to linear and Lipschitz bounded approximation properties for a pair consisting of a Banach space and a subspace. We show that...
Topics: Functional Analysis, Mathematics
Source: http://arxiv.org/abs/1702.04774
Arxiv.org
by Tan Tai Do; Emil Björnson; Erik G. Larsson
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We design jamming resistant receivers to enhance the robustness of a massive MIMO uplink channel against jamming. In the pilot phase, we estimate not only the desired channel, but also the jamming channel by exploiting purposely unused pilot sequences. The jamming channel estimate is used to construct the linear receive filter to reduce impact that jamming has on the achievable rates. The performance of the proposed scheme is analytically and numerically evaluated. These results show that the...
Topics: Information Theory, Computing Research Repository, Mathematics
Source: http://arxiv.org/abs/1702.04703
Arxiv.org
by Jittat Fakcharoenphol; Bundit Laekhanukit; Pattara Sukprasert
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Maximum flow is a fundamental problem in Combinatorial Optimization that has numerous applications in both theory and practice. In this paper, we study the flow network simplification problem, which asks to remove all the useless arcs from the graph. To be precise, an arc is useless if it does not participate in any simple s, t-path. Weihe [FOCS'94, JCSS'97] showed that if there exists an $O(n \log n)$-time algorithm for simplifying a flow network, then a maximum s, t-flow in directed planar...
Topics: Data Structures and Algorithms, Computing Research Repository
Source: http://arxiv.org/abs/1702.04786
Arxiv.org
by Amey Bhangale; Subhash Khot; Devanathan Thiruvenkatachari
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A Boolean function $f:\{0,1\}^n\rightarrow \{0,1\}$ is called a dictator if it depends on exactly one variable i.e $f(x_1, x_2, \ldots, x_n) = x_i$ for some $i\in [n]$. In this work, we study a $k$-query dictatorship test. Dictatorship tests are central in proving many hardness results for constraint satisfaction problems. The dictatorship test is said to have {\em perfect completeness} if it accepts any dictator function. The {\em soundness} of a test is the maximum probability with which it...
Topics: Computational Complexity, Computing Research Repository
Source: http://arxiv.org/abs/1702.04748
Arxiv.org
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Sigmoid functions play an important role in many areas of applied mathematics, including machine learning, population dynamics and probability. We place the study of sigmoid functions in the context of the derivative sub-group of the group of exponential Riordan arrays. Links to families of polynomials are drawn, and it is shown that in some cases these polynomials are orthogonal. In the non-orthogonal case, transformations are given that produce orthgonal systems. Alternative means of...
Topics: Classical Analysis and ODEs, Mathematics
Source: http://arxiv.org/abs/1702.04778
Arxiv.org
by Thomas Dreyfus; Charlotte Hardouin; Julien Roques; Michael F. Singer
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In the present paper, we introduce a new approach, relying on differential Galois theory of difference equations, to study the nature of the generating series of walks in the quarter plane. Using this approach, we are not only able to recover many of the recent results about these series, but also to go beyond them. For instance, we give for the first time hypertranscendency results, i.e., we prove that certain of these generating series do not satisfy any nontrivial nonlinear algebraic...
Topics: Combinatorics, Mathematics
Source: http://arxiv.org/abs/1702.04696
Arxiv.org
by Matthew L. Blow; Marco Aqil; Benno Liebchen; Davide Marenduzzo
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We provide a minimal model for an active nematic film in contact with both a solid substrate and a passive isotropic fluid, and explore its dynamics in one and two dimensions using a combination of hybrid Lattice Boltzmann simulations and analytical calculations. By imposing nematic anchoring at the substrate while active flows induce a preferred alignment at the interface ("active anchoring"), we demonstrate that directed fluid flow spontaneously emerges in cases where the two...
Topics: Condensed Matter, Soft Condensed Matter
Source: http://arxiv.org/abs/1702.04695
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We give a sufficient and necessary condition for a probability measure $\mu$ on the real line to satisfy the logarithmic Sobolev inequality for convex functions. The condition is expressed in terms of the unique left-continuous and non-decreasing map transporting the symmetric exponential measure onto $\mu$. The main tool in the proof is the theory of weak transport costs. As a consequence, we obtain dimension-free concentration bounds for the lower and upper tails of convex functions of...
Topics: Probability, Functional Analysis, Mathematics
Source: http://arxiv.org/abs/1702.04698
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by Adam Dor-On; Guy Salomon
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We apply Arveson's non-commutative boundary theory to dilate every Toeplitz-Cuntz-Krieger family of a directed graph $G$ to a full Cuntz-Krieger family for $G$. We do this by describing all representations of the Toeplitz algebra $\mathcal{T}(G)$ that have unique extension when restricted to the tensor algebra $\mathcal{T}_+(G)$. This yields an alternative proof to a result of Katsoulis and Kribs that the $C^*$-envelope of $\mathcal T_+(G)$ is the Cuntz-Krieger algebra $\mathcal O(G)$. We then...
Topics: Operator Algebras, Functional Analysis, Mathematics
Source: http://arxiv.org/abs/1702.04308
Arxiv.org
by Yves Benoist; Dominique Hulin
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We prove that a quasi-isometric map between pinched Hadamard manifolds is within bounded distance from a unique harmonic map.
Topics: Differential Geometry, Mathematics
Source: http://arxiv.org/abs/1702.04369
Arxiv.org
by Eduardo Soares; Pedro Brandão; Rui Prior; Ana Aguiar
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Mobile AdHoc NETworks (MANETs) have been identified as a key emerging technology for scenarios in which IEEE 802.11 or cellular communications are either infeasible, inefficient, or cost-ineffective. Smartphones are the most adequate network nodes in many of these scenarios, but it is not straightforward to build a network with them. We extensively survey existing possibilities to build applications on top of ad-hoc smartphone networks for experimentation purposes, and introduce a taxonomy to...
Topics: Networking and Internet Architecture, Computing Research Repository
Source: http://arxiv.org/abs/1702.04249
Arxiv.org
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We modify the path integral representation of exciton transport in open quantum systems such that an exact description of the quantum fluctuations around the classical evolution of the system is possible. As a consequence, the time evolution of the system observables is obtained by calculating the average of a stochastic difference equation which is weighted with a product of pseudo-probability density functions. From the exact equation of motion one can clearly identify the terms that are also...
Topic: Quantum Physics
Source: http://arxiv.org/abs/1702.04406
Arxiv.org
by A. M. Merritt; J. -P. Castellan; S. R. Park; J. A. Fernandez-Baca; G. D. Gu; D. Reznik
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Angle-resolved photoemission (ARPES) experiments on copper oxide superconductors revealed enigmatic kinks in electronic dispersions near 10 meV presumably due to phonons or impuritites. We used inelastic neutron scattering to measure phonon branches below 15 meV in a large single crystal sample of optimally-doped $Bi_2Sr_2CaCu_2O_{8+\delta}$ (BSCCO). The high quality dataset covered several Brilloiun zones with different final energies. In addition to acoustic branches, optic branches disperse...
Topics: Condensed Matter, Superconductivity
Source: http://arxiv.org/abs/1702.04331
Arxiv.org
by Urtzi Buijs; Yves Félix; Aniceto Murillo; Daniel Tanré
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We prove that for any complete differential graded Lie algebra (cDGL) $L$, its geometrical realization $\langle L\rangle_\bullet=\text{Hom}_{\text{cDGL}}(\mathfrak{L}_\bullet,L)$ via the cosimplicial free cDGL $\mathfrak{L}_\bullet=\widehat{\mathbb{L}}(s^{-1}\Delta^\bullet)$ is homotopy equivalent to the classical Hinich realization $\text{MC}(\mathscr{A}_\bullet\otimes L)$. For it, we need to detect certain cDGL morphisms as Maurer-Cartan elements of corresponding $L_\infty$-algebra structures.
Topics: Algebraic Topology, Mathematics
Source: http://arxiv.org/abs/1702.04397
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We consider methods for constructing explicit solutions of the non-stationary Lam\'e equation, which is a generalization of the classical Lam\'e equation, that has appeared in works on integrable models, conformal field theory, high energy physics and representation theory. We also present a general method for constructing integral representations of solutions to the non-stationary Lam\'e equation by a recursive scheme. Explicit integral representations, for special values of the model...
Topics: Mathematical Physics, Mathematics
Source: http://arxiv.org/abs/1702.05252
Arxiv.org
by Hans-Werner Henn
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Let $\Gamma$ = SL 3 (Z[ 1 2 , i]), let X be any mod-2 acyclic $\Gamma$-CW complex on which $\Gamma$ acts with finite stabilizers and let Xs be the 2-singular locus of X. We calculate the mod-2 cohomology of the Borel constructon of Xs with respect to the action of $\Gamma$. This cohomology coincides with the mod-2 cohomology of $\Gamma$ in cohomological degrees bigger than 8 and the result is compatible with a conjecture of Quillen which predicts the strucure of the cohomology ring H *...
Topics: Algebraic Topology, Mathematics
Source: http://arxiv.org/abs/1702.05032
Arxiv.org
by Xiaochang Peng; Chuan Wang; Daniel Gildea; Nianwen Xue
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Neural attention models have achieved great success in different NLP tasks. How- ever, they have not fulfilled their promise on the AMR parsing task due to the data sparsity issue. In this paper, we de- scribe a sequence-to-sequence model for AMR parsing and present different ways to tackle the data sparsity problem. We show that our methods achieve significant improvement over a baseline neural atten- tion model and our results are also compet- itive against state-of-the-art systems that do...
Topics: Computing Research Repository, Computation and Language
Source: http://arxiv.org/abs/1702.05053
Arxiv.org
by Roberto Olmos; Siham Tabik; Francisco Herrera
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Current surveillance and control systems still require human supervision and intervention. This work presents a novel automatic handgun detection system in videos appropriate for both, surveillance and control purposes. We reformulate this detection problem into the problem of minimizing false positives and solve it by building the key training data-set guided by the results of a deep Convolutional Neural Networks (CNN) classifier, then assessing the best classification model under two...
Topics: Computing Research Repository, Computer Vision and Pattern Recognition
Source: http://arxiv.org/abs/1702.05147
Arxiv.org
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Given a dissimilarity map $\delta$ on finite set $X$, we show that the set of ultrametrics (equidistant tree metrics) which are $l^\infty$-nearest to $\delta$ is a tropical polytope. We give an algorithm for computing a superset of its tropical vertices. It was shown by Ardila and Klivans that the set of all ultrametrics on a finite set of size $n$ is the Bergman fan associated to the matroid underlying the complete graph on $n$ vertices. Therefore, we derive our results in the more general...
Topics: Combinatorics, Mathematics
Source: http://arxiv.org/abs/1702.05141
Arxiv.org
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The above comment [E. I. Lashin, D. Dou, arXiv:1606.04738] claims that the paper "Quantum Raychaudhuri Equation" by S. Das, Phys. Rev. D89 (2014) 084068 [arXiv:1404.3093] has "problematic points" with regards to its derivation and implications. We show below that the above claim is incorrect, and that there are no problems with results of the above paper or its implications.
Topics: General Relativity and Quantum Cosmology, High Energy Physics - Theory
Source: http://arxiv.org/abs/1702.05219
Arxiv.org
by Max Simchowitz; Kevin Jamieson; Benjamin Recht
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We propose a novel technique for analyzing adaptive sampling called the {\em Simulator}. Our approach differs from the existing methods by considering not how much information could be gathered by any fixed sampling strategy, but how difficult it is to distinguish a good sampling strategy from a bad one given the limited amount of data collected up to any given time. This change of perspective allows us to match the strength of both Fano and change-of-measure techniques, without succumbing to...
Topics: Learning, Machine Learning, Statistics, Computing Research Repository
Source: http://arxiv.org/abs/1702.05186
Arxiv.org
by Andrew J. Groszek; Matthew J. Davis; David M. Paganin; Kristian Helmerson; Tapio P. Simula
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We introduce a new method of statistical analysis to characterise the dynamics of turbulent fluids in two dimensions. We establish that in equilibrium the vortex distributions can be uniquely connected to the temperature of the vortex gas, and apply this vortex thermometry to characterise simulations of decaying superfluid turbulence. We confirm the hypothesis of vortex evaporative heating leading to Onsager vortices proposed in Phys. Rev. Lett. 113, 165302 (2014), and find previously...
Topics: Quantum Gases, Condensed Matter
Source: http://arxiv.org/abs/1702.05229
Arxiv.org
by Serdar Elhatisari; Evgeny Epelbaum; Hermann Krebs; Timo A. Lähde; Dean Lee; Ning Li; Bing-nan Lu; Ulf-G. Meißner; Gautam Rupak
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Nuclear clustering describes the appearance of structures resembling smaller nuclei such as alpha particles (4He nuclei) within the interior of a larger nucleus. While clustering is important for several well-known examples, little is known about the general nature of clustering in nuclei. In this letter we present lattice Monte Carlo calculations based on chiral effective field theory for the ground states of helium, beryllium, carbon, and oxygen isotopes. By computing model-independent...
Topics: Nuclear Theory, Solar and Stellar Astrophysics, High Energy Physics - Lattice, Nuclear Experiment,...
Source: http://arxiv.org/abs/1702.05177
Arxiv.org
by Micha Berkooz; Prithvi Narayan; Moshe Rozali; Joan Simón
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The Thirring model with random couplings is a translationally invariant generalisation of the SYK model to 1+1 dimensions, which is tractable in the large N limit. We compute its two point function, at large distances, for any strength of the random coupling. For a given realisation, the couplings contain both irrelevant and relevant marginal operators, but statistically, in the large N limit, the random couplings are overall always marginally irrelevant, in sharp distinction to the usual...
Topics: High Energy Physics - Theory, Strongly Correlated Electrons, Disordered Systems and Neural...
Source: http://arxiv.org/abs/1702.05105
Arxiv.org
by Prasad Raghavendra; Benjamin Weitz
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It has often been claimed in recent papers that one can find a degree d Sum-of-Squares proof if one exists via the Ellipsoid algorithm. In [O17], Ryan O'Donnell notes this widely quoted claim is not necessarily true. He presents an example of a polynomial system with bounded coeffcients that admits low-degree proofs of non-negativity, but these proofs necessarily involve numbers with an exponential number of bits, causing the Ellipsoid algorithm to take exponential time. In this paper we obtain...
Topics: Computational Complexity, Computing Research Repository
Source: http://arxiv.org/abs/1702.05139
Arxiv.org
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-In the Alvarez-Macovski method [R.E. Alvarez and A. Macovski, Phys. Med. Biol., 1976, 733-744], the attenuation coefficient is approximated as a linear combination of functions of energy multiplied by coefficients that depend on the material composition at points within the object. The method then computes the line integrals of the basis set coefficient from measurements with different x-ray spectra. This paper shows that the transformation from photon counting detector data with pileup to the...
Topics: Astrophysics, Medical Physics, Physics, Instrumentation and Detectors, Instrumentation and Methods...
Source: http://arxiv.org/abs/1702.04993
Arxiv.org
by Claus Kiefer; Branislav Nikolic
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We present a new formulation for the canonical approach to conformal (Weyl-squared) gravity and its extension by the Einstein-Hilbert term and a nonminimally coupled scalar field. For this purpose we use a unimodular decomposition of the three-metric and introduce unimodular-conformal canonical variables. The important feature of this choice is that only the scale part of the three-metric and the rescaled trace part of the extrinsic curvature change under a conformal transformation. This...
Topics: General Relativity and Quantum Cosmology, High Energy Physics - Theory
Source: http://arxiv.org/abs/1702.04973
Arxiv.org
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We investigate an extension of the Minimal Supersymmetric Standard Model (MSSM) containing a $SU(2)$ Higgs triplet of zero hypercharge and a gauge singlet. We focus on a scenario of this model which allows a light pseudoscalar and/or a scalar below $100$ GeV in the spectrum, consistent with the most recent data from the LHC and the earlier data from the LEP experiments. The triplet extension gives rise to two additional charged Higgs bosons which do not couple to fermions but can decay into $Z...
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1702.04975
Arxiv.org
by Mohamed A. Alrshah; Mohamed Othman; Borhanuddin Ali; Zurina Hanapi
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Agile-SD is one of the latest versions of loss-based congestion control algorithm (CCA), which has been proposed to improve the total performance of transmission control protocol (TCP) over high-speed and short-distance networks. It has introduced a new mechanism, called agility factor mechanism, which shortens the epoch time to reduce the sensitivity to packet losses and in turn to increase the average throughput. Agile-SD has only been tested via simulation; however, it has not been...
Topics: Networking and Internet Architecture, Computing Research Repository
Source: http://arxiv.org/abs/1702.04861
Arxiv.org
by Gabriele La Nave; Chih-Chung Liu
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We generalize the descriptions of vortex moduli spaces in \cite{Br} to more than one section with adiabatic constant $s$. The moduli space is topologically independent of $s$ but is not compact with respect to $C^\infty$ topology. Following \cite{PW}, we construct a Gromov limit for vortices of fixed energy, an attempt to compactify the moduli space.
Topics: Mathematical Physics, Mathematics
Source: http://arxiv.org/abs/1702.05013
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by S. Hohenegger; S. Stieberger
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New monodromy relations of loop amplitudes are derived in open string theory. We particularly study N-point one-loop amplitudes described by a world-sheet cylinder (planar and non-planar) and derive a set of relations between subamplitudes of different color orderings. Various consistency checks are performed by matching alpha'-expansions of planar and non-planar amplitudes involving elliptic iterated integrals with the resulting periods giving rise to two sets of multiple elliptic zeta values....
Topics: High Energy Physics - Theory, Algebraic Geometry, Number Theory, Mathematics
Source: http://arxiv.org/abs/1702.04963
Arxiv.org
by Songze Li; Sucha Supittayapornpong; Mohammad Ali Maddah-Ali; A. Salman Avestimehr
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We focus on sorting, which is the building block of many machine learning algorithms, and propose a novel distributed sorting algorithm, named Coded TeraSort, which substantially improves the execution time of the TeraSort benchmark in Hadoop MapReduce. The key idea of Coded TeraSort is to impose structured redundancy in data, in order to enable in-network coding opportunities that overcome the data shuffling bottleneck of TeraSort. We empirically evaluate the performance of CodedTeraSort...
Topics: Information Theory, Distributed, Parallel, and Cluster Computing, Computing Research Repository,...
Source: http://arxiv.org/abs/1702.04850
Arxiv.org
by André Belotto da Silva; José Ginés Espín Buendía
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We characterize the limit periodic sets of families of polynomial planar vector fields up to homeomorphisms. We show that any limit periodic set is topologically equivalent to a compact and connected semialgebraic set of the sphere with empty interior. Conversely, we show that any compact and connected semialgebraic set of the sphere with empty interior can be realized as a limit periodic set.
Topics: Classical Analysis and ODEs, Mathematics
Source: http://arxiv.org/abs/1702.04965
Arxiv.org
by Jean in 't Zand
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Superbursts were discovered at the beginning of this millennium. Just like type-I X-ray bursts, they are thought to be due to thermonuclear shell flashes on neutron stars, only igniting much deeper. With respect to type-I bursts, they last 10$^3$ times longer, are 10$^3$ as rare, ignite 10$^3$ times deeper (in column depth) and are thought to be fueled by carbon instead of hydrogen and helium. Observationally, they are sometimes hard to distinguish from intermediate duration bursts which are...
Topics: Astrophysics, High Energy Astrophysical Phenomena
Source: http://arxiv.org/abs/1702.04899
We extend Matui's notion of almost finiteness to general etale groupoids. We then show that the reduced groupoid C*-algebras of minimal almost finite groupoids have stable rank one. The proof follows a new strategy, which can be regarded as a local version of the large subalgebra argument. We present two applications to the reduced crossed products. Firstly, for any minimal action of any abelian group on a compact space with a totally disconnected free factor, we show that the crossed product...
Topics: Group Theory, Operator Algebras, Dynamical Systems, Mathematics
Source: http://arxiv.org/abs/1702.04875
Arxiv.org
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The lightest electroweak baryon as a topological object is investigated by using a general effective Lagrangian of composite electroweak symmetry breaking and the spin-independent electroweak baryon-nucleon scattering cross section is calculated. We explicitly show the masses of the electroweak baryons and the cross section as functions of the Peskin-Takeuchi $S$ parameter and the ratio of the masses of axial-vector and vector composite bosons. We find that it is acceptable to regard the...
Topics: High Energy Physics - Experiment, High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1702.04987
Arxiv.org
by Yangchao Shen; Joonsuk Huh; Yao Lu; Junhua Zhang; Kuan Zhang; Shuaining Zhang; Kihwan Kim
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Molecules are the most demanding quantum systems to be simulated by quantum computers because of their complexity and the emergent role of quantum nature. The recent theoretical proposal of Huh et al. (Nature Photon., 9, 615 (2015)) showed that a multi-photon network with a Gaussian input state can simulate a molecular spectroscopic process. Here, we report the first experimental demonstration of molecular vibrational spectroscopy of SO$_{2}$ with a trapped-ion system. In our realization, the...
Topics: Atomic Physics, Physics, Optics, Quantum Physics, Chemical Physics
Source: http://arxiv.org/abs/1702.04859
Arxiv.org
by Christian Steffens; Marius Pesavento
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A sparse recovery approach for direction finding in partly calibrated arrays composed of subarrays with unknown displacements is introduced. The proposed method is based on mixed nuclear norm and 1 norm minimization and exploits block-sparsity and low-rank structure in the signal model. For efficient implementation a compact equivalent problem reformulation is presented. The new technique is applicable to subarrays of arbitrary topologies and grid-based sampling of the subarray manifolds. In...
Topics: Information Theory, Computing Research Repository, Mathematics
Source: http://arxiv.org/abs/1702.05411