6
6.0
Jun 30, 2018
06/18
by
A. L. Saraiva; A. Baena; M. J. Calderón; Belita Koiller
texts
eye 6
favorite 0
comment 0
We provide here a roadmap for modeling silicon nano-devices with one or two group V donors (D). We discuss systems containing one or two electrons, that is, D^0, D^-, D_2^+ and D_2^0 centers. The impact of different levels of approximation is discussed. The most accurate instances -- for which we provide quantitative results -- are within multivalley effective mass including the central cell correction and a configuration interaction account of the electron-electron correlations. We also derive...
Topics: Mesoscale and Nanoscale Physics, Condensed Matter
Source: http://arxiv.org/abs/1407.8224
7
7.0
Jun 30, 2018
06/18
by
A. Mohammadi; E. R. Bezerra de Mello; A. A. Saharian
texts
eye 7
favorite 0
comment 0
We investigate the vacuum fermionic currents in the geometry of a compactified cosmic string on background of de Sitter spacetime. The currents are induced by magnetic fluxes running along the cosmic string and enclosed by the compact dimension. We show that the vacuum charge and the radial component of the current density vanish. By using the Abel-Plana summation formula, the azimuthal and axial currents are explicitly decomposed into two parts: the first one corresponds to the geometry of a...
Topics: High Energy Physics - Theory, General Relativity and Quantum Cosmology
Source: http://arxiv.org/abs/1407.8095
50
50
Jun 30, 2018
06/18
by
A. O. Smirnov; E. G. Semenova; V. Zinger; N. Zinger
texts
eye 50
favorite 0
comment 0
A periodic two-phase algebro-geometric solution of the focusing nonlinear Schr\"odinger equation is constructed in terms of elliptic Jacobi theta-functions. A dependence of this solution on the parameters of a spectral curve is investigated. An existence of a real smooth finite-gap solution of NLS equation with complex initial phase is proven. Degenerations of the constructed solution to one-phase traveling wave solution and solutions in the form of the plane waves are carried.
Topics: Mathematics, Nonlinear Sciences, Exactly Solvable and Integrable Systems, Mathematical Physics,...
Source: http://arxiv.org/abs/1407.7974
5
5.0
Jun 30, 2018
06/18
by
A. Skopal; H. Drechsel; T. N. Tarasova; T. Kato; M. Fujii; F. Teyssier; O. Garde; J. Guarro; J. Edlin; C. Buil; D. Antao; J. N. Terry; T. Lemoult; S. Charbonnel; T. Bohlsen; A. Favaro; K. Graham
texts
eye 5
favorite 0
comment 0
We determine the temporal evolution of the luminosity L(WD), radius R(WD) and effective temperature Teff of the white dwarf (WD) pseudophotosphere of V339 Del from its discovery to around day 40. Another main objective was studying the ionization structure of the ejecta. These aims were achieved by modelling the optical/near-IR spectral energy distribution (SED) using low-resolution spectroscopy (3500 - 9200 A), UBVRcIc and JHKLM photometry. During the fireball stage (Aug. 14.8 - 19.9, 2013),...
Topics: Astrophysics, Solar and Stellar Astrophysics
Source: http://arxiv.org/abs/1407.8212
5
5.0
Jun 30, 2018
06/18
by
A. Zazunov; A. Brunetti; A. Levy Yeyati; R. Egger
texts
eye 5
favorite 0
comment 0
We present a comprehensive theoretical framework for the Andreev bound state population dynamics in superconducting weak links. Contrary to previous works, our approach takes into account the generated nonequilibrium distribution of the continuum quasiparticle states in a self-consistent way. As application of our theory, we show that the coupling of the superconducting contact to environmental phase fluctuations induces a charge imbalance of the continuum quasiparticle population. This...
Topics: Superconductivity, Mesoscale and Nanoscale Physics, Condensed Matter
Source: http://arxiv.org/abs/1407.7991
66
66
Jun 30, 2018
06/18
by
A. de Paz; B. Naylor; J. Huckans A. Carrance; O. Gorceix; E. Marechal; P. Pedri; B. Laburthe-Tolra; L. Vernac
texts
eye 66
favorite 0
comment 0
We experimentally study the spin dynamics of mesoscopic ensembles of ultracold magnetic spin-3 atoms located in two separated wells of an optical dipole trap. We use a radio-frequency sweep to selectively flip the spin of the atoms in one of the wells, which produces two separated spin domains of opposite polarization. We observe that these engineered spin domains are metastable with respect to the long-range magnetic dipolar interactions between the two ensembles. The absence of inter-cloud...
Topics: Physics, Quantum Gases, Atomic Physics, Quantum Physics, Condensed Matter
Source: http://arxiv.org/abs/1407.8130
4
4.0
Jun 30, 2018
06/18
by
ATLAS Collaboration
texts
eye 4
favorite 0
comment 0
This letter presents a search for new resonances decaying to final states with a vector boson produced in association with a high transverse momentum photon, $V\gamma$, with $V= W(\rightarrow \ell \nu)$ or $Z(\rightarrow \ell^{+} \ell^{-})$, where $\ell = e$ or $\mu$. The measurements use 20.3 fb$^{-1}$ of proton-proton collision data at a center-of-mass energy of $\sqrt{s}=8$ TeV recorded with the ATLAS detector. No deviations from the Standard Model expectations are found, and production...
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1407.8150
7
7.0
Jun 30, 2018
06/18
by
Adriana Gonzalez; Laurent Jacques
texts
eye 7
favorite 0
comment 0
The 2-D phase unwrapping problem aims at retrieving a "phase" image from its modulo $2\pi$ observations. Many applications, such as interferometry or synthetic aperture radar imaging, are concerned by this problem since they proceed by recording complex or modulated data from which a "wrapped" phase is extracted. Although 1-D phase unwrapping is trivial, a challenge remains in higher dimensions to overcome two common problems: noise and discontinuities in the true phase...
Topics: Mathematics, Optimization and Control
Source: http://arxiv.org/abs/1407.8040
7
7.0
Jun 30, 2018
06/18
by
Aitor Lewkowycz; Eric Perlmutter
texts
eye 7
favorite 0
comment 0
We derive several new results for Renyi entropy, $S_n$, across generic entangling surfaces. We establish a perturbative expansion of the Renyi entropy, valid in generic quantum field theories, in deformations of a given density matrix. When applied to even-dimensional conformal field theories, these results lead to new constraints on the $n$-dependence, independent of any perturbative expansion. In 4d CFTs, we show that the $n$-dependence of the universal part of the ground state Renyi entropy...
Topic: High Energy Physics - Theory
Source: http://arxiv.org/abs/1407.8171
3
3.0
Jun 30, 2018
06/18
by
Akitoshi Kawamura; Yusuke Kobayashi
texts
eye 3
favorite 0
comment 0
Suppose we want to patrol a fence (line segment) using k mobile agents with given speeds v_1, ..., v_k so that every point on the fence is visited by an agent at least once in every unit time period. Czyzowicz et al. conjectured that the maximum length of the fence that can be patrolled is (v_1 + ... + v_k)/2, which is achieved by the simple strategy where each agent i moves back and forth in a segment of length v_i/2. We disprove this conjecture by a counterexample involving k = 6 agents. We...
Topics: Multiagent Systems, Computing Research Repository, Computational Geometry, Robotics
Source: http://arxiv.org/abs/1407.8194
5
5.0
Jun 30, 2018
06/18
by
Alejandro Cabo-Bizet; V. I. Giraldo-Rivera
texts
eye 5
favorite 0
comment 0
In this note we address some issues of recent interest, related to the asymptotic symmetry algebra of higher spin black holes in $sl(3,\mathbb{R})\times sl(3,\mathbb{R})$ Chern Simons (CS) formulation. We compute the fixed time Dirac bracket algebra that acts on two different phase spaces. Both of these spaces contain black holes as zero modes. The result for one of these phase spaces is explicitly shown to be isomorphic to $W^{(2)}_3\times W^{(2)}_3$ in first order perturbations.
Topic: High Energy Physics - Theory
Source: http://arxiv.org/abs/1407.8241
5
5.0
Jun 30, 2018
06/18
by
Alejandro Edera; Yanela Strappa; Facundo Bromberg
texts
eye 5
favorite 0
comment 0
Markov networks are models for compactly representing complex probability distributions. They are composed by a structure and a set of numerical weights. The structure qualitatively describes independences in the distribution, which can be exploited to factorize the distribution into a set of compact functions. A key application for learning structures from data is to automatically discover knowledge. In practice, structure learning algorithms focused on "knowledge discovery" present...
Topics: Computing Research Repository, Data Structures and Algorithms, Learning
Source: http://arxiv.org/abs/1407.8088
5
5.0
Jun 30, 2018
06/18
by
Alexandru Dimca; Stefan Papadima; Alexandru Suciu
texts
eye 5
favorite 0
comment 0
We relate the geometry of the resonance varieties associated to a commutative differential graded algebra model of a space to the finiteness properties of the completions of its Alexander-type invariants. We also describe in simple algebraic terms the non-translated components of the degree-one characteristic varieties for a class of non-proper complex manifolds.
Topics: Mathematics, Algebraic Topology, Algebraic Geometry
Source: http://arxiv.org/abs/1407.8027
3
3.0
Jun 30, 2018
06/18
by
Amadeo Jimenez-Alba; Karl Landsteiner; Luis Melgar
texts
eye 3
favorite 0
comment 0
We study the magneto response with non-conserved currents in Holography. Non-conserved currents are dual to massive vector fields in AdS. We introduce the mass in a gauge invariant way via the St\"uckelberg mechanism. In particular we find generalizations of the Chiral Magnetic Effect, the Chiral Separation Effect and the Chiral Magnetic Wave. Since the associated charge is not conserved we need to source it explicitly by a coupling, the generalization of the chemical potential. In this...
Topics: High Energy Physics - Theory, High Energy Physics - Phenomenology, Strongly Correlated Electrons,...
Source: http://arxiv.org/abs/1407.8162
4
4.0
Jun 30, 2018
06/18
by
Andreas Buhr; Christian Engwer; Mario Ohlberger; Stephan Rave
texts
eye 4
favorite 0
comment 0
The Reduced Basis (RB) method is a well established method for the model order reduction of problems formulated as parametrized partial differential equations. One crucial requirement for the application of RB schemes is the availability of an a posteriori error estimator to reliably estimate the error introduced by the reduction process. However, straightforward implementations of standard residual based estimators show poor numerical stability, rendering them unusable if high accuracy is...
Topics: Mathematics, Numerical Analysis
Source: http://arxiv.org/abs/1407.8005
4
4.0
Jun 30, 2018
06/18
by
Andrew Duncan; Shuohao Liao; Tomas Vejchodsky; Radek Erban; Ramon Grima
texts
eye 4
favorite 0
comment 0
The noisy dynamics of chemical systems is commonly studied using either the chemical master equation (CME) or the chemical Fokker-Planck equation (CFPE). The latter is a continuum approximation of the discrete CME approach. We here show that the CFPE may fail to capture the CME's prediction of noise-induced multistability. In particular we find a simple chemical system for which the CME's marginal probability distribution changes from unimodal to multimodal as the system-size decreases below a...
Topics: Quantitative Methods, Quantitative Biology, Subcellular Processes
Source: http://arxiv.org/abs/1407.8256
4
4.0
Jun 30, 2018
06/18
by
Anna M. Barry; F. Hajir; P. G. Kevrekidis
texts
eye 4
favorite 0
comment 0
In this work, we construct suitable generating functions for vortices of alternating signs in the realm of Bose-Einstein condensates. In addition to the vortex-vortex interaction included in earlier fluid dynamics constructions of such functions, the vortices here precess around the center of the trap. This results in the generating functions of the vortices of positive charge and of negative charge satisfying a modified, so-called, Tkachenko differential equation. From that equation, we...
Topics: Nonlinear Sciences, Quantum Gases, Mathematics, Pattern Formation and Solitons, Mathematical...
Source: http://arxiv.org/abs/1407.7965
5
5.0
Jun 30, 2018
06/18
by
Anthony R. Pullen; Andrew J. Benson; Leonidas A. Moustakas
texts
eye 5
favorite 0
comment 0
We describe the methodology to include nonlinear evolution, including tidal effects, in the computation of subhalo distribution properties in both cold (CDM) and warm (WDM) dark matter universes. Using semi-analytic modeling, we include effects from dynamical friction, tidal stripping, and tidal heating, allowing us to dynamically evolve the subhalo distribution. We calibrate our nonlinear evolution scheme to the CDM subhalo mass function in the Aquarius N-body simulation, producing a subhalo...
Topics: Astrophysics, Cosmology and Nongalactic Astrophysics
Source: http://arxiv.org/abs/1407.8189
5
5.0
Jun 30, 2018
06/18
by
Ashkan Balouchi; Kurt Jacobs
texts
eye 5
favorite 0
comment 0
Feedback control of quantum systems via continuous measurement involves complex nonlinear dynamics. Except in very special cases, even for a single qubit optimal feedback protocols are unknown. Not even do intuitive candidates exist for choosing the measurement basis, which is the primary non-trivial ingredient in the feedback control of a qubit. Here we present a series of arguments that suggest a particular form for the optimal protocol for a broad class of noise sources in the regime of good...
Topic: Quantum Physics
Source: http://arxiv.org/abs/1407.8172
4
4.0
Jun 30, 2018
06/18
by
Assaf Ben-Yishai; Ofer Shayevitz
texts
eye 4
favorite 0
comment 0
Consider a pair of terminals connected by two independent additive white Gaussian noise channels, and limited by individual power constraints. The first terminal would like to reliably send information to the second terminal, within a given error probability. We construct an explicit interactive scheme consisting of only (non-linear) scalar operations, by endowing the Schalkwijk-Kailath noiseless feedback scheme with modulo arithmetic. Our scheme achieves a communication rate close to the...
Topics: Mathematics, Computing Research Repository, Information Theory
Source: http://arxiv.org/abs/1407.8022
3
3.0
Jun 30, 2018
06/18
by
Avideh Sabeti; Mian Wei; Radu V. Craiu
texts
eye 3
favorite 0
comment 0
Conditional copulas are flexible statistical tools that couple joint conditional and marginal conditional distributions. In a linear regression setting with more than one covariate and two dependent outcomes, we propose the use of additive models for conditional bivariate copula models and discuss computation and model selection tools for performing Bayesian inference. The method is illustrated using simulations and a real example.
Topics: Statistics, Methodology
Source: http://arxiv.org/abs/1407.8119
6
6.0
Jun 30, 2018
06/18
by
Awais Khawar; Ahmed Abdelhadi; T. Charles Clancy
texts
eye 6
favorite 0
comment 0
Multiple-input multiple-output (MIMO) radar is a relatively new concept in the field of radar signal processing. Many novel MIMO radar waveforms have been developed by considering various performance metrics and constraints. In this paper, we show that finite alphabet constant-envelope (FACE) quadrature-pulse shift keying (QPSK) waveforms can be designed to realize a given covariance matrix by transforming a constrained nonlinear optimization problem into an unconstrained nonlinear optimization...
Topics: Networking and Internet Architecture, Mathematics, Computing Research Repository, Information Theory
Source: http://arxiv.org/abs/1407.8510
3
3.0
Jun 30, 2018
06/18
by
B. Fuks; M. Klasen; D. R. Lamprea; M. Rothering
texts
eye 3
favorite 0
comment 0
The search for electroweak superpartners has recently moved to the centre of interest at the LHC. We provide the currently most precise theoretical predictions for these particles, use them to assess the precision of parton shower simulations, and reanalyse public experimental results assuming more general decompositions of gauginos and sleptons.
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1407.7963
3
3.0
Jun 30, 2018
06/18
by
B. Z. Kopeliovich; I. K. Potashnikova; Ivan Schmidt; M. Siddikov
texts
eye 3
favorite 0
comment 0
A charmonium produced in heavy ion collisions at RHIC and LHC propagates through a dense co-moving matter with a rather high relative momentum, =4-10GeV^2. In spite of Debye screening of the binding potential, the charmonium survives with a substantial probability, even if the c-cbar potential is completely screened in the hot environment. In addition, the color-exchange interaction with the medium is another important source of charmonium suppression. Attenuation in a hot medium caused by both...
Topics: High Energy Physics - Phenomenology, Nuclear Theory
Source: http://arxiv.org/abs/1407.8080
6
6.0
Jun 30, 2018
06/18
by
Benjamin Dodson; Andrew Lawrie
texts
eye 6
favorite 0
comment 0
In this paper we study the focusing cubic wave equation in 1+5 dimensions with radial initial data as well as the one-equivariant wave maps equation in 1+3 dimensions with the model target manifolds $\mathbb{S}^3$ and $\mathbb{H}^3$. In both cases the scaling for the equation leaves the $\dot{H}^{\frac{3}{2}} \times \dot{H}^{\frac{1}{2}}$-norm of the solution invariant, which means that the equation is super-critical with respect to the conserved energy. Here we prove a conditional scattering...
Topics: Mathematics, Analysis of PDEs, Mathematical Physics
Source: http://arxiv.org/abs/1407.8199
7
7.0
Jun 30, 2018
06/18
by
Binbin Lin; Qingyang Li; Qian Sun; Ming-Jun Lai; Ian Davidson; Wei Fan; Jieping Ye
texts
eye 7
favorite 0
comment 0
\textit{Drosophila melanogaster} has been established as a model organism for investigating the fundamental principles of developmental gene interactions. The gene expression patterns of \textit{Drosophila melanogaster} can be documented as digital images, which are annotated with anatomical ontology terms to facilitate pattern discovery and comparison. The automated annotation of gene expression pattern images has received increasing attention due to the recent expansion of the image database....
Topics: Computing Research Repository, Computational Engineering, Finance, and Science, Learning
Source: http://arxiv.org/abs/1407.8147
3
3.0
Jun 30, 2018
06/18
by
Boris A. Malomed; Dmitry E. Pelinovsky
texts
eye 3
favorite 0
comment 0
We justify the Thomas--Fermi approximation for the elliptic problem with the repulsive nonlinear confinement used in the recent physical literature. The method is based on the resolvent estimates and the fixed-point iterations.
Topics: Nonlinear Sciences, Mathematics, Analysis of PDEs, Pattern Formation and Solitons
Source: http://arxiv.org/abs/1407.8043
6
6.0
Jun 30, 2018
06/18
by
Brian Swingle; John McGreevy
texts
eye 6
favorite 0
comment 0
We give a detailed physical argument for the area law for entanglement entropy in gapped phases of matter arising from local Hamiltonians. Our approach is based on renormalization group (RG) ideas and takes a resource oriented perspective. We report four main results. First, we argue for the "weak area law": any gapped phase with a unique ground state on every closed manifold obeys the area law. Second, we introduce an RG based classification scheme and give a detailed argument that...
Topics: Quantum Physics, High Energy Physics - Theory, Strongly Correlated Electrons, Condensed Matter
Source: http://arxiv.org/abs/1407.8203
3
3.0
Jun 30, 2018
06/18
by
Bruno Rousseau; François Lapointe; Minh Nguyen; Maxime Biron; Etienne Gaufrès; Saman Choubak; Zheng Han; Vincent Bouchiat; Patrick Desjardins; Michel Côté; Richard Martel
texts
eye 3
favorite 0
comment 0
Herein, intervalley scattering is exploited to account for anomalous antiresonances in the infrared spectra of doped and disordered single layer graphene. We present infrared spectroscopy measurements of graphene grafted with iodophenyl moieties in both reflection microscopy and transmission configurations. Asymmetric transparency windows at energies corresponding to phonon modes near the {\Gamma} and K points are observed, in contrast to the featureless spectrum of pristine graphene. These...
Topics: Mesoscale and Nanoscale Physics, Materials Science, Condensed Matter
Source: http://arxiv.org/abs/1407.8141
4
4.0
Jun 30, 2018
06/18
by
Brynmor Haskell; Nils Andersson; Caroline D`Angelo; Nathalie Degenaar; Kostas Glampedakis; Wynn C. G. Ho; Paul D. Lasky; Andrew Melatos; Manuel Oppenoorth; Alessandro Patruno; Maxim Priymak
texts
eye 4
favorite 0
comment 0
Rapidly rotating neutron stars in Low Mass X-ray Binaries have been proposed as an interesting source of gravitational waves. In this chapter we present estimates of the gravitational wave emission for various scenarios, given the (electromagnetically) observed characteristics of these systems. First of all we focus on the r-mode instability and show that a 'minimal' neutron star model (which does not incorporate exotica in the core, dynamically important magnetic fields or superfluid degrees...
Topics: High Energy Astrophysical Phenomena, Astrophysics, Solar and Stellar Astrophysics, General...
Source: http://arxiv.org/abs/1407.8254
4
4.0
Jun 30, 2018
06/18
by
Caihua Chen; Shiqian Ma; Junfeng Yang
texts
eye 4
favorite 0
comment 0
In this paper, we first propose a general inertial proximal point method for the mixed variational inequality (VI) problem. Based on our knowledge, without stronger assumptions, convergence rate result is not known in the literature for inertial type proximal point methods. Under certain conditions, we are able to establish the global convergence and a $o(1/k)$ convergence rate result (under certain measure) of the proposed general inertial proximal point method. We then show that the...
Topics: Mathematics, Optimization and Control
Source: http://arxiv.org/abs/1407.8238
3
3.0
Jun 30, 2018
06/18
by
Carina Popovici; Thomas Hilger; Maria Gomez-Rocha; Andreas Krassnigg
texts
eye 3
favorite 0
comment 0
We investigate capabilities of the effective interaction in a rainbow-ladder truncated meson model of QCD within a covariant Landau-gauge Bethe-Salpeter-equation approach. Based upon past success for the light- as well as heavy-quark domains, we discuss the range of applicability and features of an effort with comprehensive phenomenological claim and goals.
Topics: High Energy Physics - Phenomenology, Nuclear Theory
Source: http://arxiv.org/abs/1407.7970
3
3.0
Jun 30, 2018
06/18
by
Carlo Angelantonj; Ioannis Florakis; Mirian Tsulaia
texts
eye 3
favorite 0
comment 0
We compute one-loop threshold corrections to non-abelian gauge couplings in four-dimensional heterotic vacua with spontaneously broken $\cal N = 2 \to \cal N = 0$ supersymmetry, obtained as Scherk-Schwarz reductions of six-dimensional K3 compactifications. As expected, the gauge thresholds are no-longer BPS protected, and receive contributions also from the excitations of the RNS sector. Remarkably, the difference of thresholds for non-abelian gauge couplings is BPS saturated and exhibits a...
Topic: High Energy Physics - Theory
Source: http://arxiv.org/abs/1407.8023
3
3.0
Jun 30, 2018
06/18
by
Cesare Alippi; Maurizio Bocca; Giacomo Boracchi; Neal Patwari; Manuel Roveri
texts
eye 3
favorite 0
comment 0
RF sensor networks are used to localize people indoor without requiring them to wear invasive electronic devices. These wireless mesh networks, formed by low-power radio transceivers, continuously measure the received signal strength (RSS) of the links. Radio Tomographic Imaging (RTI) is a technique that generates 2D images of the change in the electromagnetic field inside the area covered by the radio transceivers to spot the presence and movements of animates (e.g., people, large animals) or...
Topics: Networking and Internet Architecture, Computing Research Repository, Emerging Technologies
Source: http://arxiv.org/abs/1407.8509
3
3.0
Jun 30, 2018
06/18
by
Chan-Kao Chang; Adam Waszczak; Hsing-Wen Lin; Wing-Huen Ip; Thomas. A. Prince; Shrinivas R. Kulkarni; Russ Laher; Jason Surace
texts
eye 3
favorite 0
comment 0
Asteroids of size larger than 150 m generally do not have rotation periods smaller than 2.2 hours. This spin cutoff is believed to be due to the gravitationally bound rubble-pile structures of the asteroids. Rotation with periods exceeding this critical value will cause asteroid breakup. Up until now, only one object, 2001 OE84, has been found to be an exception to this spin cutoff. We report the discovery of a new super-fast rotator, (335433) 2005 UW163, spinning with a period of 1.290 hours...
Topics: Earth and Planetary Astrophysics, Astrophysics
Source: http://arxiv.org/abs/1407.8264
4
4.0
Jun 30, 2018
06/18
by
Charles B. Thorn
texts
eye 4
favorite 0
comment 0
We develop superstring bit models, in which the lightcone transverse coordinates in D spacetime dimensions are replaced with d=D-2 double-valued "flavor" indices $x^k-> f_k=1,2$; $k=2,...,d+1$. In such models the string bits have no space to move. Letting each string bit be an adjoint of a "color" group U(N), we then analyze the physics of 't Hooft's limit $N->\infty$, in which closed chains of many string bits behave like free lightcone IIB superstrings with d compact...
Topic: High Energy Physics - Theory
Source: http://arxiv.org/abs/1407.8144
4
4.0
Jun 30, 2018
06/18
by
Charles K. Fisher; Pankaj Mehta
texts
eye 4
favorite 0
comment 0
Feature selection, identifying a subset of variables that are relevant for predicting a response, is an important and challenging component of many methods in statistics and machine learning. Feature selection is especially difficult and computationally intensive when the number of variables approaches or exceeds the number of samples, as is often the case for many genomic datasets. Here, we introduce a new approach -- the Bayesian Ising Approximation (BIA) -- to rapidly calculate posterior...
Topics: Quantitative Biology, Statistics, Quantitative Methods, Computing Research Repository, Machine...
Source: http://arxiv.org/abs/1407.8187
4
4.0
Jun 30, 2018
06/18
by
Chia-Yu Hsieh; YunKyong Hyon; Hijin Lee; Tai-Chia Lin; Chun Liu
texts
eye 4
favorite 0
comment 0
In order to describe the dynamics of crowded ions (charged particles), we use an energetic variation approach to derive a modified Poisson-Nernst-Planck (PNP) system which includes an extra dissipation due to the effective velocity differences between ion species. Such a system is more complicated than the original PNP system but with the same equilibrium states. Using Schauder's fixed-point theorem, we develop a local existence theorem of classical solutions for the modified PNP system....
Topics: Mathematics, Analysis of PDEs, Mathematical Physics
Source: http://arxiv.org/abs/1407.8245
4
4.0
Jun 30, 2018
06/18
by
Chong Qi
texts
eye 4
favorite 0
comment 0
It is becoming increasingly important to understand the uncertainties of nuclear mass model calculations and their limitations when extrapolating to driplines. In this paper we evaluate the parameter uncertainties the Duflo-Zuker (DZ) shell model mass formulae by fitting to the latest experimental mass compilation AME2012 and analyze the propagation of the uncertainties in binding energy calculations when extrapolated to driplines. The parameter uncertainties and uncertain propagations are...
Topic: Nuclear Theory
Source: http://arxiv.org/abs/1407.8221
5
5.0
Jun 30, 2018
06/18
by
Chong Qi
texts
eye 5
favorite 0
comment 0
In this note we give a short introduction to the Duflo-Zuker shell model mass formula which has been shown to have great prediction power but is mostly used as a black box due to its complex nature.
Topic: Nuclear Theory
Source: http://arxiv.org/abs/1407.8218
5
5.0
Jun 30, 2018
06/18
by
Christoph Baranec; Reed Riddle; Nicholas M. Law; A. N. Ramaprakash; Shriharsh Tendulkar; Kristina Hogstrom; Khanh Bui; Mahesh Burse; Pravin Chordia; Hillol Das; Richard Dekany; Shrinivas Kulkarni; Sujit Punnadi
texts
eye 5
favorite 0
comment 0
As new large-scale astronomical surveys greatly increase the number of objects targeted and discoveries made, the requirement for efficient follow-up observations is crucial. Adaptive optics imaging, which compensates for the image-blurring effects of Earth's turbulent atmosphere, is essential for these surveys, but the scarcity, complexity and high demand of current systems limits their availability for following up large numbers of targets. To address this need, we have engineered and...
Topics: Instrumentation and Methods for Astrophysics, Astrophysics
Source: http://arxiv.org/abs/1407.8179
7
7.0
Jun 30, 2018
06/18
by
Christopher B. Johnson; R. I. Hynes; T. Maccarone; C T. Britt; H. Davis; P. G. Jonker; M. A. P. Torres; D. Steeghs; S. Greiss; G. Nelemans
texts
eye 7
favorite 0
comment 0
We present the results of a spectroscopic and photometric analysis of HD314884, a slowly pulsating B star (SPB) in a binary system with detected soft X-ray emission. We spectrally classify the B star as a B5V-B6V star with T$_{eff}$ = 15,490 $\pm$ 310 K, log $g$ = 3.75 $\pm$ 0.25 dex, and a photometric period of P$_{0}$ = 0.889521(12) days. A spectroscopic period search reveals an orbital period for the system of P$_{orb}$ = 1.3654(11) days. The discrepancy in the two periods and the...
Topics: Astrophysics, Solar and Stellar Astrophysics
Source: http://arxiv.org/abs/1407.7938
3
3.0
Jun 30, 2018
06/18
by
Christopher Eltschka; Jens Siewert
texts
eye 3
favorite 0
comment 0
A striking result from nonrelativistic quantum mechanics is the monogamy of entanglement, which states that a particle can be maximally entangled only with one other party, not with several ones. While there is the exact quantitative relation for three qubits and also several inequalities describing monogamy properties it is not clear to what extent exact monogamy relations are a general feature of quantum mechanics. We prove that in all many-qubit systems there exist strict monogamy laws for...
Topic: Quantum Physics
Source: http://arxiv.org/abs/1407.8195
6
6.0
Jun 30, 2018
06/18
by
Christopher Perry; Rahul Jain; Jonathan Oppenheim
texts
eye 6
favorite 0
comment 0
Quantum resources can be more powerful than classical resources - a quantum computer can solve certain problems exponentially faster than a classical computer, and computing a function of two people's inputs can be done with exponentially less communication with quantum messages than with classical ones. Here we consider a task between two players, Alice and Bob where quantum resources are infinitely more powerful than classical ones. Alice is given a string of length n, and Bob's task is to...
Topic: Quantum Physics
Source: http://arxiv.org/abs/1407.8217
6
6.0
Jun 30, 2018
06/18
by
Chuanhai Liu; Ryan Martin
texts
eye 6
favorite 0
comment 0
The development of statistical methods for valid and efficient probabilistic inference without prior distributions has a long history. Fisher's fiducial inference is perhaps the most famous of these attempts. We argue that, despite its seemingly prior-free formulation, fiducial and its various extensions are not prior-free and, therefore, do not meet the requirements for prior-free probabilistic inference. In contrast, the inferential model (IM) framework is genuinely prior-free and is shown to...
Topics: Mathematics, Statistics Theory, Statistics, Methodology
Source: http://arxiv.org/abs/1407.8225
3
3.0
Jun 30, 2018
06/18
by
Chunhua Wang; Changlin Xiang
texts
eye 3
favorite 0
comment 0
Let $1 p^{2}+p,a(0)>0$ and $\Omega$ satisfies some geometry conditions if $0\in\partial\Omega$, say, all the principle curvatures of $\partial\Omega$ at $0$ are negative, then the above problem has infinitely many solutions.
Topics: Mathematics, Analysis of PDEs
Source: http://arxiv.org/abs/1407.7982
5
5.0
Jun 30, 2018
06/18
by
Coralie Neiner; Maryline Briquet; Stéphane Mathis; Pieter Degroote
texts
eye 5
favorite 0
comment 0
Asteroseismology and spectropolarimetry have allowed us to progress significantly in our understanding of the physics of hot stars over the last decade. It is now possible to combine these two techniques to learn even more information about hot stars and constrain their models. While only a few magnetic pulsating hot stars are known as of today and have been studied with both seismology and spectropolarimetry, new opportunities - in particular Kepler2 and BRITE - are emerging and will allow us...
Topics: Astrophysics, Solar and Stellar Astrophysics
Source: http://arxiv.org/abs/1407.8087
5
5.0
Jun 30, 2018
06/18
by
Coralie Neiner; the UVMag consortium
texts
eye 5
favorite 0
comment 0
UVMag is a medium-size space telescope equipped with a high-resolution spectropolarimeter working in the UV and visible domains. It will be proposed to ESA for a future M mission. It will allow scientists to study all types of stars as well as e.g. exoplanets and the interstellar medium. It will be particularly useful for massive stars, since their spectral energy distribution peaks in the UV. UVMag will allow us to study massive stars and their circumstellar environment (in particular the...
Topics: Astrophysics, Solar and Stellar Astrophysics
Source: http://arxiv.org/abs/1407.8082
8
8.0
Jun 30, 2018
06/18
by
Cédric M. Campos; J. M. Sanz-Serna
texts
eye 8
favorite 0
comment 0
We study a method, Extra Chance Generalized Hybrid Monte Carlo, to avoid rejections in the Hybrid Monte Carlo method and related algorithms. In the spirit of delayed rejection, whenever a rejection would occur, extra work is done to find a fresh proposal that, hopefully, may be accepted. We present experiments that clearly indicate that the additional work per sample carried out in the extra chance approach clearly pays in terms of the quality of the samples generated.
Topics: Probability, Mathematics, Numerical Analysis
Source: http://arxiv.org/abs/1407.8107
5
5.0
Jun 30, 2018
06/18
by
D. A. Ross; Agustin Sabio Vera
texts
eye 5
favorite 0
comment 0
We propose a regularization of the BFKL equation which allows for its solution in each order of perturbation theory by means of a sum over multiple poles. This sum can be presented in a rather simple formula for the Fourier transform in the azimuthal angle of the gluon Green function. In order to test our method, we have compared a few orders in the expansion to previous results by Del Duca, Dixon, Duhr and Pennington, finding agreement. Our formalism is general and can be applied to other,...
Topic: High Energy Physics - Theory
Source: http://arxiv.org/abs/1407.8057
