3
3.0
Jun 30, 2018
06/18
by
Yuan Cao; Yonglin Cao
texts
eye 3
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$(1+pw)$-constacyclic codes of arbitrary length over the non-principal ideal ring $\mathbb{Z}_{p^s} +u\mathbb{Z}_{p^s}$ are studied, where $p$ is a prime, $w\in \mathbb{Z}_{p^s}^{\times}$ and $s$ an integer satisfying $s\geq 2$. First, the structure of any $(1+pw)$-constacyclic code over $\mathbb{Z}_{p^s} +u\mathbb{Z}_{p^s}$ are presented. Then enumerations for the number of all codes and the number of codewords in each code, and the structure of dual codes for these codes are given,...
Topics: Information Theory, Computing Research Repository, Mathematics
Source: http://arxiv.org/abs/1703.00761
4
4.0
Jun 30, 2018
06/18
by
Amir Sarabadani; Aaron Halfaker; Dario Taraborelli
texts
eye 4
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Wikidata, like Wikipedia, is a knowledge base that anyone can edit. This open collaboration model is powerful in that it reduces barriers to participation and allows a large number of people to contribute. However, it exposes the knowledge base to the risk of vandalism and low-quality contributions. In this work, we build on past work detecting vandalism in Wikipedia to detect vandalism in Wikidata. This work is novel in that identifying damaging changes in a structured knowledge-base requires...
Topics: Information Retrieval, Computers and Society, Computing Research Repository
Source: http://arxiv.org/abs/1703.03861
4
4.0
Jun 30, 2018
06/18
by
T. Bisztriczky
texts
eye 4
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comment 0
The Separation Problem asks for the minimum number s(O,K) of hyperplanes required to strictly separate any interior point O of a convex body K from all faces of K. The Conjecture is s(O,K) is at most 2 to the power d in real d-space , and we verify this for the class of simply linked neighbourly 4-polytopes.
Topics: Combinatorics, Mathematics
Source: http://arxiv.org/abs/1703.03803
48
48
Jun 30, 2018
06/18
by
Gil R. Cavalcanti; Ralph L. Klaasse
texts
eye 48
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A generalized complex structure is called stable if its defining anticanonical section vanishes transversally, on a codimension-two submanifold. Alternatively, it is a zero elliptic residue symplectic structure in the elliptic tangent bundle associated to this submanifold. We develop Gompf-Thurston symplectic techniques adapted to Lie algebroids, and use these to construct stable generalized complex structures out of log-symplectic structures. In particular we introduce the notion of a boundary...
Topics: Differential Geometry, Symplectic Geometry, Mathematics
Source: http://arxiv.org/abs/1703.03798
5
5.0
Jun 30, 2018
06/18
by
Eric Cockayne
texts
eye 5
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We use first-principles density functional theory total energy and linear response phonon calculations to compute the Helmholtz and Gibbs free energy as a function of temperature, pressure, and cell volume in the flexible metal-organic framework material MIL-53(Cr) within the quasiharmonic approximation. GGA and metaGGA calculations were performed, each including empirical van der Waals (vdW) forces under the D2, D3, or D3(BJ) parameterizations. At all temperatures up to 500 K and pressures...
Topics: Materials Science, Condensed Matter
Source: http://arxiv.org/abs/1703.03440
10
10.0
Jun 30, 2018
06/18
by
C. Inostroza; I. Kondrashuk; N. Merino; F. Nadal
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eye 10
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The contraction method is a procedure that allows to establish non-trivial relations between Lie algebras and has had succesful applications in both mathematics and theoretical physics. This work deals with generalizations of the contraction procedure with a main focus in the so called S-expansion method as it includes most of the other generalized contractions. Basically, the S-exansion combines a Lie algebra $\mathcal{G}$ with a finite abelian semigroup $S$ in order to define new S-expanded...
Topics: High Energy Physics - Theory, Mathematical Software, Computing Research Repository, Mathematical...
Source: http://arxiv.org/abs/1703.04036
4
4.0
Jun 30, 2018
06/18
by
Zohair Abu-Shaban; Xiangyun Zhou; Thushara Abhayapala; Gonzalo Seco-Granados; Henk Wymeersch
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eye 4
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Location-aware communication systems are expected to play a pivotal part in the next generation of mobile communication networks. Therefore, there is a need to understand the localization limits in these networks, particularly, using millimeter-wave technology (mmWave). Towards that, we address the uplink and downlink localization limits in terms of 3D position and orientation error bounds for mmWave multipath channels. We also carry out a detailed analysis of the dependence of the bounds of...
Topics: Information Theory, Computing Research Repository, Mathematics
Source: http://arxiv.org/abs/1704.03234
112
112
Jun 30, 2018
06/18
by
Keiji Oguiso
texts
eye 112
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We give a few explicit examples which answer an open minded question of Professor Igor Dolgachev on complex dynamics of the inertia group of a smooth rational curve on a projective K3 surface and its variants for a rational surface and a non-projective K3 surface.
Topics: Algebraic Geometry, Mathematics
Source: http://arxiv.org/abs/1704.03142
7
7.0
Jun 30, 2018
06/18
by
Austin Hoag; Maruša Bradač; Michele Trenti; Tommaso Treu; Kasper B. Schmidt; Kuang-Han Huang; Brian C. Lemaux; Julie He; Stephanie R. Bernard; Louis E. Abramson; Charlotte A. Mason; Takahiro Morishita; Laura Pentericci; Tim Schrabback
texts
eye 7
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Within one billion years of the Big Bang, intergalactic hydrogen was ionized by sources emitting ultraviolet and higher energy photons. This was the final phenomenon to globally affect all the baryons (visible matter) in the Universe. It is referred to as cosmic reionization and is an integral component of cosmology. It is broadly expected that intrinsically faint galaxies were the primary ionizing sources due to their abundance in this epoch. However, at the highest redshifts ($z>7.5$;...
Topics: Astrophysics of Galaxies, Astrophysics
Source: http://arxiv.org/abs/1704.02970
6
6.0
Jun 30, 2018
06/18
by
Florent Benaych-Georges; Charles Bordenave; Antti Knowles
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eye 6
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We consider inhomogeneous Erd\H{o}s-R\'enyi graphs. We suppose that the maximal mean degree $d$ satisfies $d \ll \log n$. We characterize the asymptotic behavior of the $n^{1 - o(1)}$ largest eigenvalues of the adjacency matrix and its centred version. We prove that these extreme eigenvalues are governed at first order by the largest degrees and, for the adjacency matrix, by the nonzero eigenvalues of the expectation matrix. Our results show that the extreme eigenvalues exhibit a novel...
Topics: Probability, Mathematics
Source: http://arxiv.org/abs/1704.02953
6
6.0
Jun 30, 2018
06/18
by
P. A. Varotsos; N. V. Sarlis; E. S. Skordas
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eye 6
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When monitoring geophysical parameters, data from segments that are contaminated by noise may have to be abandoned. This is the case, for example, in the geoelectrical field measurements at some sites in Japan, where high noise -due mainly to leakage currents from DC driven trains- prevails almost during 70\% of the 24 hour operational time. We show that even in such a case, the identification of seismic electric signals (SES), which are long-range correlated signals, may be possible, if the...
Topics: Geophysics, Physics
Source: http://arxiv.org/abs/1704.03272
8
8.0
Jun 30, 2018
06/18
by
Unnat Jain; Ziyu Zhang; Alexander Schwing
texts
eye 8
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Generating diverse questions for given images is an important task for computational education, entertainment and AI assistants. Different from many conventional prediction techniques is the need for algorithms to generate a diverse set of plausible questions, which we refer to as "creativity". In this paper we propose a creative algorithm for visual question generation which combines the advantages of variational autoencoders with long short-term memory networks. We demonstrate that...
Topics: Computing Research Repository, Computer Vision and Pattern Recognition
Source: http://arxiv.org/abs/1704.03493
4
4.0
Jun 30, 2018
06/18
by
L. D. Nguyen; T. Q. Duong; H. Q. Ngo; K. Tourki
texts
eye 4
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We consider the downlink of a cell-free massive multiple-input multiple-output (MIMO) network where numerous distributed access points (APs) serve a smaller number of users under time division duplex operation. An important issue in deploying cell-free networks is high power consumption, which is proportional to the number of APs. This issue has raised the question as to their suitability for green communications in terms of the total energy efficiency (bits/Joule). To tackle this, we develop a...
Topics: Information Theory, Computing Research Repository, Mathematics
Source: http://arxiv.org/abs/1704.03288
8
8.0
Jun 30, 2018
06/18
by
Jerónimo Cortez; William Cuervo; Hugo A. Morales-Técotl; Juan C. Ruelas
texts
eye 8
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The success of loop quantum cosmology to resolve classical singularities of homogeneous models has led to its application to the classical Schwarszchild black hole interior, which takes the form of a homogeneous Kantowski-Sachs model. The first steps of this were done in pure quantum mechanical terms, hinting at the traversable character of the would-be classical singularity, and then others were performed using effective heuristic models capturing quantum effects that allowed a geometrical...
Topic: General Relativity and Quantum Cosmology
Source: http://arxiv.org/abs/1704.03362
3
3.0
Jun 30, 2018
06/18
by
X. Z. Teng; C. E. Teh; J. Lee; X. X. Xu; C. J. Lin; L. J. Sun; J. S. Wang; D. Q. Fang; S. Leblond; Z. H. Li; J. Li; N. R. Ma; J. B. Ma; H. L. Zang; P. Ma; S. L. Jin; M. R. Huang; Z. Bai; J. J. Liu; T. Lokotko; F. Yang; H. M. Jia; D. X. Wang; Y. Y. Yang; Z. G. Hu; M. Wang; H. Q. Zhang
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eye 3
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Fragmentation cross section of $^{28}$Si + $^{9}$Be reaction at 75.8 MeV/u was analyzed for studying the decay mode of single-proton emission in $^{21}$Al (the proton-rich nucleus with neutron closed-shell of $N = 8$ and $T_z = -5/2$). With the comparison between the measured fragmentation cross section and the theoretical cross section produced by EPAX3.1a for the observed nuclei (i.e. $^{20}$Mg, $^{21}$Al and $^{22}$Si), the expected yield for a particle stable $^{21}$Al was estimated. With...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1704.03249
3
3.0
Jun 30, 2018
06/18
by
Beibei Hu; Tiecheng Xia
texts
eye 3
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Coupled modified nonlinear Schr\"{o}dinger(CMNLS) equations describe the pulse propagation in the picosecond or femtosecond regime of the birefringent optical fibers. In this paper, we use the Fokas method to analyze the initial-boundary value problem for the CMNLS equations on the half-line. Assume that the solution u(x,t) and v(x,t) of CMNLS equations are exists, and we show that it can be expressed in terms of the unique solution of a matrix Riemann-Hilbert problem formulated in the...
Topics: Pattern Formation and Solitons, Mathematical Physics, Nonlinear Sciences, Mathematics
Source: http://arxiv.org/abs/1704.03623
8
8.0
Jun 30, 2018
06/18
by
Antonio L. Alfeo; Mario G. C. A. Cimino; Sara Egidi; Bruno Lepri; Alex Pentland; Gigliola Vaglini
texts
eye 8
favorite 0
comment 0
Positioning data offer a remarkable source of information to analyze crowds urban dynamics. However, discovering urban activity patterns from the emergent behavior of crowds involves complex system modeling. An alternative approach is to adopt computational techniques belonging to the emergent paradigm, which enables self-organization of data and allows adaptive analysis. Specifically, our approach is based on stigmergy. By using stigmergy each sample position is associated with a digital...
Topics: Physics, Artificial Intelligence, Computing Research Repository, Social and Information Networks,...
Source: http://arxiv.org/abs/1704.03667
3
3.0
Jun 30, 2018
06/18
by
Michal Zajaček; Andreas Eckart; Banafsheh Shahzamanian
texts
eye 3
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comment 0
There have been many speculations about the character of the dusty object moving fast in the vicinity of the Galactic centre black hole. The recent detection of polarized continuum emission provides new constraints for the models. The fact that the object is intrinsically polarized implies that it is non-spherical. The authors propose that a young star developing a bow shock can explain the main characteristics. However, more observations in the future are needed for the final confirmation of...
Topics: Astrophysics of Galaxies, Astrophysics
Source: http://arxiv.org/abs/1704.03700
6
6.0
Jun 30, 2018
06/18
by
Hossein Asnaashari Eivari; S. Alireza Ghasemi; Hossein Tahmasbi; Samare Rostami; Somayeh Faraji; Robabe Rasoulkhani; Stefan Goedecker; Maximilian Amsler
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eye 6
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We report on the ab initio discovery of a novel putative ground state for quasi two-dimensional TiO$_2$ through a structural search using the minima hopping method with an artificial neural network potential. The structure is based on a honeycomb lattice and is energetically lower than the experimentally reported lepidocrocite sheet by 7~meV/atom, and merely 13~meV/atom higher in energy than the ground state rutile bulk structure. According to our calculations, the hexagonal sheet is stable...
Topics: Materials Science, Condensed Matter
Source: http://arxiv.org/abs/1704.03983
3
3.0
Jun 30, 2018
06/18
by
Matthew Riemer; Elham Khabiri; Richard Goodwin
texts
eye 3
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comment 0
Although neural networks are well suited for sequential transfer learning tasks, the catastrophic forgetting problem hinders proper integration of prior knowledge. In this work, we propose a solution to this problem by using a multi-task objective based on the idea of distillation and a mechanism that directly penalizes forgetting at the shared representation layer during the knowledge integration phase of training. We demonstrate our approach on a Twitter domain sentiment analysis task with...
Topics: Learning, Computing Research Repository, Computation and Language
Source: http://arxiv.org/abs/1704.03617
3
3.0
Jun 30, 2018
06/18
by
J. J. Bernal; M. Guerreiro; J. J. Simón
texts
eye 3
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comment 0
In this paper we develop a technique to extend any bound for the minimum distance of cyclic codes constructed from its defining sets (ds-bounds) to abelian (or multivariate) codes through the notion of $\mathbb{B}$-apparent distance. We use this technique to improve the searching for new bounds for the minimum distance of abelian codes. We also study conditions for an abelian code to verify that its $\mathbb{B}$-apparent distance reaches its (true) minimum distance. Then we construct some...
Topics: Information Theory, Computing Research Repository, Mathematics
Source: http://arxiv.org/abs/1704.03761
4
4.0
Jun 30, 2018
06/18
by
Leandro F. Aurichi; Lyubomyr Zdomskyy
texts
eye 4
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comment 0
We present an internal characterization for the productively Lindel\"of property, thus answering a long-standing problem attributed to Tamano. We also present some results about the relation Alster spaces vs. productively Lindel\"of spaces.
Topics: General Topology, Mathematics
Source: http://arxiv.org/abs/1704.03843
7
7.0
Jun 30, 2018
06/18
by
Wei-Ning Hsu; Yu Zhang; James Glass
texts
eye 7
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comment 0
An ability to model a generative process and learn a latent representation for speech in an unsupervised fashion will be crucial to process vast quantities of unlabelled speech data. Recently, deep probabilistic generative models such as Variational Autoencoders (VAEs) have achieved tremendous success in modeling natural images. In this paper, we apply a convolutional VAE to model the generative process of natural speech. We derive latent space arithmetic operations to disentangle learned...
Topics: Learning, Machine Learning, Statistics, Computing Research Repository, Computation and Language
Source: http://arxiv.org/abs/1704.04222
4
4.0
Jun 30, 2018
06/18
by
Julien Cividini; Anupam Kundu
texts
eye 4
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comment 0
We compute the full probability distribution of the positions of a tagged particle exactly for given arbitrary initial positions of the particles and for general single-particle propagators. We consider the thermodynamic limit of our exact expressions in quenched and annealed settings. For a particular class of single-particle propagators, the exact formula is expressed in a simple integral form in the quenched case whereas in the annealed case, it is expressed as a simple combination of Bessel...
Topics: Statistical Mechanics, Condensed Matter
Source: http://arxiv.org/abs/1704.04017
6
6.0
Jun 30, 2018
06/18
by
Sandipan Banerjee; James Sweet; Christopher Sweet; Marya Lieberman
texts
eye 6
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comment 0
Falsification of medicines is a big problem in many developing countries, where technological infrastructure is inadequate to detect these harmful products. We have developed a set of inexpensive paper cards, called Paper Analytical Devices (PADs), which can efficiently classify drugs based on their chemical composition, as a potential solution to the problem. These cards have different reagents embedded in them which produce a set of distinctive color descriptors upon reacting with the...
Topics: Computing Research Repository, Computer Vision and Pattern Recognition
Source: http://arxiv.org/abs/1704.04251
3
3.0
Jun 30, 2018
06/18
by
Anton Tuzov
texts
eye 3
favorite 0
comment 0
This paper presents a class of Two-Step General Linear Methods for the numerical solution of Retarded Functional Differential Equations. Explicit methods up to order five are constructed. To avoid order reduction for mildly stiff problems the uniform stage order of the methods is chosen to be close to uniform order.
Topics: Numerical Analysis, Mathematics
Source: http://arxiv.org/abs/1704.04619
12
12
Jun 30, 2018
06/18
by
Alexander Singh; Konstantinos Giannakis; Theodore Andronikos
texts
eye 12
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comment 0
In this work we introduce Qumin, a novel quantum programming language with a focus on providing an easy to use, minimalist, high-level, and easily extensible platform for quantum programming. Qumin's design concentrates on encompassing the various interactions between classical and quantum computation via the use of two sublanguages: an untyped one that handles classical preparation and control, and one linearly typed that explicitly handles quantum routines. This allows the classical part of...
Topics: Programming Languages, Computing Research Repository, Quantum Physics
Source: http://arxiv.org/abs/1704.04460
4
4.0
Jun 30, 2018
06/18
by
Christian Ballot
texts
eye 4
favorite 0
comment 0
We survey and prove properties a family of recurrences bears in relation to integer representations, compositions, the Pascal triangle, sums of digits, Nim games and Beatty sequences.
Topics: Number Theory, Mathematics
Source: http://arxiv.org/abs/1704.04476
3
3.0
Jun 30, 2018
06/18
by
Eugene A. Feinberg; Pavlo O. Kasyanov; Michael Z. Zgurovsky
texts
eye 3
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comment 0
This paper provides sufficient conditions for the existence of values and solutions for two-person zero-sum one-step games with infinite and possibly noncompact action sets for both players, possibly unbounded payoff functions, which may be neither convex nor concave. For such games, payoffs may not be defined for some pairs of strategies. In addition, the paper investigates continuity properties of the value functions and solution multifunctions, when action sets and payoffs depend on a...
Topics: Optimization and Control, Mathematics
Source: http://arxiv.org/abs/1704.04564
6
6.0
Jun 30, 2018
06/18
by
Daniel Hernandez-Hernandez; Oscar Hernan Madrid Padilla
texts
eye 6
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comment 0
We study the worst portfolios for a class of law invariant dynamic monetary utility functions with domain in a class of stochastic processes. The concept of comonotonicity is introduced for these processes in order to prove the existence of worst portfolios. Using robust representations of monetary utility function processes in discrete time, a relation between the worst portfolios at different periods of time is presented. Finally, we study conditions to achieve the maximum in the...
Topics: Optimization and Control, Mathematics
Source: http://arxiv.org/abs/1704.04686
3
3.0
Jun 30, 2018
06/18
by
Mohamad Darwich; Samer Israwi; Raafat Talhouk
texts
eye 3
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comment 0
In this paper, a generalized nonlinear Camassa-Holm equation with time- and space-dependent coefficients is considered. We show that the control of the higher order dispersive term is possible by using an adequate weight function to define the energy. The existence and uniqueness of solutions are obtained via a Picard iterative method.
Topics: Analysis of PDEs, Mathematics
Source: http://arxiv.org/abs/1704.04921
18
18
Jun 30, 2018
06/18
by
Denis P. Cabezas; Lurdes M. Martínez; Yovanny J. Buleje; Mutsumi Ishitsuka; José K. Ishitsuka; Satoshi Morita; Ayumi Asai; Satoru UeNo; Takako T. Ishii; Reizaburo Kitai; Shinsuke Takasao; Yusuke Yoshinaga; Kenichi Otsuji; Kazunari Shibata
texts
eye 18
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comment 0
Coronal disturbances associated with solar flares, such as H$\alpha$ Moreton waves, X-ray waves, and extreme ultraviolet (EUV) coronal waves are discussed herein in relation to magnetohydrodynamics fast-mode waves or shocks in the corona. To understand the mechanism of coronal disturbances, full-disk solar observations with high spatial and temporal resolution over multiple wavelengths are of crucial importance. We observed a filament eruption, whose shape is like a "dandelion",...
Topics: Solar and Stellar Astrophysics, Astrophysics
Source: http://arxiv.org/abs/1701.00308
4
4.0
Jun 30, 2018
06/18
by
Louis H. Y. Chen; Yuh-Jia Lee; Hsin-Hung Shih
texts
eye 4
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comment 0
In this paper we establish a framework for normal approximation for white noise functionals by Stein's method and Hida calculus. Our work is inspired by that of Nourdin and Peccati (Probab. Theory Relat. Fields 145, 75-118, 2009), who combined Stein's method and Malliavin calculus for normal approximation for functionals of Gaussian processes.
Topics: Probability, Mathematics
Source: http://arxiv.org/abs/1701.00360
5
5.0
Jun 30, 2018
06/18
by
Hanbaek Lyu; David Sivakoff
texts
eye 5
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We study class of cellular automata called $\kappa$-color firefly cellular automata, which were introduced recently by the first author. At each discrete time $t$, each vertex in a graph has a state in ${\{0, \ldots, \kappa-1\}}$, and a special state $b(\kappa) = \lfloor\frac{\kappa-1}{2}\rfloor$ is designated as the `blinking' state. At step $t$, simultaneously for all vertices, the state of a vertex increments from $k$ to $k+1\mod \kappa$ unless $k>b(\kappa)$ and at least one of its...
Topics: Probability, Mathematics
Source: http://arxiv.org/abs/1701.00319
45
45
Jun 30, 2018
06/18
by
Ce Xu
texts
eye 45
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comment 0
The generalized hyperharmonic numbers $h_n^{(m)}(k)$ are defined by means of the multiple harmonic numbers. We show that the hyperharmonic numbers $h_n^{(m)}(k)$ satisfy certain recurrence relation which allow us to write them in terms of classical harmonic numbers. Moreover, we prove that the Euler-type sums with hyperharmonic numbers: \[S\left( {k,m;p} \right): = \sum\limits_{n = 1}^\infty {\frac{{h_n^{\left( m \right)}\left( k \right)}}{{{n^p}}}} \;\;\left(p\geq m+1,\ {k = 1,2,3} \right)\]...
Topics: Mathematics, Number Theory
Source: http://arxiv.org/abs/1701.00391
4
4.0
Jun 30, 2018
06/18
by
KwangHo Park; Tamara Bogdanović
texts
eye 4
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Dynamical friction is thought to be a principal mechanism responsible for orbital evolution of massive black holes (MBHs) in the aftermath of galactic mergers and an important channel for formation of gravitationally bound MBH binaries. We use 2D radiative hydrodynamic simulations to investigate the efficiency of dynamical friction in the presence of radiative feedback from an MBH moving through a uniform density gas. We find that ionizing radiation that emerges from the innermost parts of the...
Topics: Astrophysics of Galaxies, Astrophysics
Source: http://arxiv.org/abs/1701.00526
5
5.0
Jun 30, 2018
06/18
by
J. D'Ambroise; P. G. Kevrekidis
texts
eye 5
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comment 0
It is known that multidimensional complex potentials obeying $\mathcal{PT}$-symmetry may possess all real spectra and continuous families of solitons. Recently it was shown that for multi-dimensional systems these features can persist when the parity symmetry condition is relaxed so that the potential is invariant under reflection in only a single spatial direction. We examine the existence, stability and dynamical properties of localized modes within the cubic nonlinear Schr\"odinger...
Topics: Pattern Formation and Solitons, Nonlinear Sciences
Source: http://arxiv.org/abs/1701.00553
6
6.0
Jun 30, 2018
06/18
by
Robert Myers
texts
eye 6
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comment 0
This paper proves that every non-disk Seifert surface $F$ for a knot $K$ in $S^3$ is smoothly concordant to a Seifert surface $F^{\prime}$ for a hyperbolic knot $K^{\prime}$ of arbitrarily large volume. This gives a new and simpler proof of the result of Friedl and of Kawauchi that every knot is $S$-equivalent to a hyperbolic knot of arbitrarily large volume. The construction also gives a new and simpler proof of the result of Silver and Whitten and of Kawauchi that for every knot $K$ there is...
Topics: Geometric Topology, Mathematics
Source: http://arxiv.org/abs/1701.00516
6
6.0
Jun 30, 2018
06/18
by
M J Deuzeman; A S Stodolna; E E B Leerssen; A Antoncecchi; N Spook; T Kleijntjens; J Versluis; S Witte; K S E Eikema; W Ubachs; R Hoekstra; O O Versolato
texts
eye 6
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comment 0
The ablation of solid tin surfaces by an 800-nanometer-wavelength laser is studied for a pulse length range from 500 fs to 4.5 ps and a fluence range spanning 0.9 to 22 J/cm^2. The ablation depth and volume are obtained employing a high-numerical-aperture optical microscope, while the ion yield and energy distributions are obtained from a set of Faraday cups set up under various angles. We found a slight increase of the ion yield for an increasing pulse length, while the ablation depth is...
Topics: Plasma Physics, Physics
Source: http://arxiv.org/abs/1701.01006
7
7.0
Jun 30, 2018
06/18
by
Yao-Lun Yang; Neal J. Evans; Joel D. Green; Michael M. Dunham; Jes K. Jørgensen
texts
eye 7
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We use Herschel spectrophotometry of BHR71, an embedded Class 0 protostar, to provide new constraints on its physical properties. We detect 645 (non-unique) spectral lines amongst all spatial pixels. At least 61 different spectral lines originate from the central region. A CO rotational diagram analysis shows four excitation temperature components, 43 K, 197 K, 397 K, and 1057 K. Low-J CO lines trace the outflow while the high-J CO lines are centered on the infrared source. The low-excitation...
Topics: Astrophysics of Galaxies, Solar and Stellar Astrophysics, Astrophysics
Source: http://arxiv.org/abs/1701.00803
4
4.0
Jun 30, 2018
06/18
by
Leon A. Takhtajan; Peter Zograf
texts
eye 4
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We derive a local index theorem in Quillen's form for families of Cauchy-Riemann operators on orbifold Riemann surfaces (or Riemann orbisurfaces) that are quotients of the hyperbolic plane by the action of cofinite finitely generated Fuchsian groups. Each conical point (or a conjugacy class of primitive elliptic elements in the Fuchsian group) gives rise to an extra term in the local index theorem that is proportional to the symplectic form of a new K\"{a}hler metric on the moduli space of...
Topics: Algebraic Geometry, Mathematics
Source: http://arxiv.org/abs/1701.00771
7
7.0
Jun 30, 2018
06/18
by
Ding Liu; Zhaowen Wang; Nasser Nasrabadi; Thomas Huang
texts
eye 7
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Single image super-resolution (SR) is an ill-posed problem which aims to recover high-resolution (HR) images from their low-resolution (LR) observations. The crux of this problem lies in learning the complex mapping between low-resolution patches and the corresponding high-resolution patches. Prior arts have used either a mixture of simple regression models or a single non-linear neural network for this propose. This paper proposes the method of learning a mixture of SR inference modules in a...
Topics: Computing Research Repository, Computer Vision and Pattern Recognition
Source: http://arxiv.org/abs/1701.00823
5
5.0
Jun 30, 2018
06/18
by
Wenqin Shao; Jean-Louis Rougier; François Devienne; Mateusz Viste
texts
eye 5
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comment 0
We show that it is common to lose some datapoints for mea-surements scheduled at regular interval on RIPE Atlas. Thetemporal correlation between missing measurements and con-nection events are analyzed, in the pursuit of understandingreasons behind such missings. To our surprise, a big part of measurements are lost while probes are connected.
Topics: Networking and Internet Architecture, Computing Research Repository
Source: http://arxiv.org/abs/1701.00938
10
10.0
Jun 30, 2018
06/18
by
Justin C. Smith; Francisca Sagredo; Kieron Burke
texts
eye 10
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Density functional theory (DFT) has become the most popular approach to electronic structure across disciplines, especially in material and chemical sciences. Last year, at least 30,000 papers used DFT to make useful predictions or give insight into an enormous diversity of scientific problems, ranging from battery development to solar cell efficiency and far beyond. The success of this field has been driven by usefully accurate approximations based on known exact conditions and careful testing...
Topics: Materials Science, Physics, Condensed Matter, Chemical Physics
Source: http://arxiv.org/abs/1701.00873
5
5.0
Jun 30, 2018
06/18
by
Cupjin Huang; Yaoyun Shi
texts
eye 5
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Cryptographic hash functions are fundamental primitives widely used in practice. For such a function $f:\{0, 1\}^n\to\{0, 1\}^m$, it is nearly impossible for an adversary to produce the hash $f(x)$ without knowing the secret message $x\in\{0, 1\}^n$. Unfortunately, all hash functions are vulnerable under the side-channel attack, which is a grave concern for information security in practice. This is because typically $m\ll n$ and an adversary needs only $m$ bits of information to pass the...
Topic: Quantum Physics
Source: http://arxiv.org/abs/1701.01091
4
4.0
Jun 30, 2018
06/18
by
Shiva Prasad Kasiviswanathan; Kobbi Nissim; Hongxia Jin
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eye 4
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Data is continuously generated by modern data sources, and a recent challenge in machine learning has been to develop techniques that perform well in an incremental (streaming) setting. In this paper, we investigate the problem of private machine learning, where as common in practice, the data is not given at once, but rather arrives incrementally over time. We introduce the problems of private incremental ERM and private incremental regression where the general goal is to always maintain a...
Topics: Cryptography and Security, Machine Learning, Statistics, Data Structures and Algorithms, Computing...
Source: http://arxiv.org/abs/1701.01093
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15
Jun 30, 2018
06/18
by
Tony. J. Puthenpurakal
texts
eye 15
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Let $A$ be a regular ring containing a field of characteristic zero and let $R = A[X_1,\ldots, X_m]$. Consider $R$ as standard graded with $deg \ A = 0$ and $deg \ X_i = 1$ for all $i$. In this paper we present a comprehensive study of graded components of local cohomology modules $H^i_I(R)$ where $I$ is an \emph{arbitrary} homogeneous ideal in $R$. Our study seems to be the first in this regard.
Topics: Commutative Algebra, Mathematics
Source: http://arxiv.org/abs/1701.01270
6
6.0
Jun 30, 2018
06/18
by
Brendan Murphy; Giorgis Petridis
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eye 6
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This is an expository survey on recent sum-product results in finite fields. We present a number of sum-product or "expander" results that say that if $|A| > p^{2/3}$ then some set determined by sums and product of elements of $A$ is nearly as large as possible, and if $|A|
Topics: Combinatorics, Mathematics
Source: http://arxiv.org/abs/1701.01635
3
3.0
Jun 30, 2018
06/18
by
Yao-Kun Wang; Yu-Ran Zhang
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eye 3
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Quantum deficit originates in questions regarding work extraction from quantum systems coupled to a heat bath [Phys. Rev. Lett. 89, 180402 (2002)]. It is a kind of quantum correlations besides entanglement and quantum discord, and links quantum thermodynamics with quantum correlations. In this paper, we evaluate the one-way deficit of two adjacent spins in the bulk for the XY model. We find that the one-way deficit characterizes the quantum phase transition in the XX model and the transverse...
Topic: Quantum Physics
Source: http://arxiv.org/abs/1701.01629
9
9.0
Jun 30, 2018
06/18
by
Joshua A. Grochow; Mrinal Kumar; Michael Saks; Shubhangi Saraf
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eye 9
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We observe that a certain kind of algebraic proof - which covers essentially all known algebraic circuit lower bounds to date - cannot be used to prove lower bounds against VP if and only if what we call succinct hitting sets exist for VP. This is analogous to the Razborov-Rudich natural proofs barrier in Boolean circuit complexity, in that we rule out a large class of lower bound techniques under a derandomization assumption. We also discuss connections between this algebraic natural proofs...
Topics: Algebraic Geometry, Computational Complexity, Computing Research Repository, Mathematics
Source: http://arxiv.org/abs/1701.01717
3
3.0
Jun 30, 2018
06/18
by
Fred Jegerlehner; Karol Kolodziej
texts
eye 3
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We present a sample of results for the cross sections of several processes of low energetic $e^+e^-$ annihilation into final states containing pions accompanied by one or two photons, or a light lepton pair. The results, which have been obtained with a new version of a multipurpose Monte Carlo program CARLOMAT, labelled 3.1, demonstrate new capabilities of the program which, among others, include a possibility of taking into account either the initial or final state radiation separately, or...
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1701.01837
3
3.0
Jun 30, 2018
06/18
by
Drossos Gintides; Leonidas Mindrinos
texts
eye 3
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In this work we consider the method of non-linear boundary integral equation for solving numerically the inverse scattering problem of obliquely incident electromagnetic waves by a penetrable homogeneous cylinder in three dimensions. We consider the indirect method and simple representations for the electric and the magnetic fields in order to derive a system of five integral equations, four on the boundary of the cylinder and one on the unit circle where we measure the far-field pattern of the...
Topics: Numerical Analysis, Mathematics
Source: http://arxiv.org/abs/1701.01859
3
3.0
Jun 30, 2018
06/18
by
Tudor S. Ratiu; Asilya Suleymanova; Andrei Shafarevich
texts
eye 3
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comment 0
The spectral series of the Schr\"odinger operator with a delta-potential on a three-dimensional compact spherically symmetric manifold in the semiclassical limit as $h\to0$ are described.
Topics: Mathematical Physics, Mathematics
Source: http://arxiv.org/abs/1701.01759
3
3.0
Jun 30, 2018
06/18
by
Boyu Zhang
texts
eye 3
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comment 0
This article proves that the parity of the number of Klein-bottle leaves in a smooth cooriented taut foliation is invariant under smooth deformations within taut foliations, provided that every Klein-bottle leaf involved in the counting has non-trivial linear holonomy.
Topics: Geometric Topology, Mathematics
Source: http://arxiv.org/abs/1701.02084
8
8.0
Jun 30, 2018
06/18
by
Anca Dumitrache; Lora Aroyo; Chris Welty
texts
eye 8
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Cognitive computing systems require human labeled data for evaluation, and often for training. The standard practice used in gathering this data minimizes disagreement between annotators, and we have found this results in data that fails to account for the ambiguity inherent in language. We have proposed the CrowdTruth method for collecting ground truth through crowdsourcing, that reconsiders the role of people in machine learning based on the observation that disagreement between annotators...
Topics: Human-Computer Interaction, Computing Research Repository, Computation and Language
Source: http://arxiv.org/abs/1701.02185
4
4.0
Jun 30, 2018
06/18
by
Alaa E. Hamza; Ahmed G. Ghallab
texts
eye 4
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In this article, we investigate the method of upper and lower solutions for Volterra integral equation of the first kind on arbitrary time scale $\mathbb{T}$. We establish some existence results in a certain sector. Moreover, monotone iterative technique is used to obtain maximal and minimal solutions of the considered equation.
Topics: Dynamical Systems, Mathematics
Source: http://arxiv.org/abs/1701.02038
6
6.0
Jun 30, 2018
06/18
by
Vincent Chabannes; Christophe Prud'Homme; Marcela Szopos; Ranine Tarabay
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eye 6
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The objective of the present work is to construct a sound mathematical, numerical and computational framework relevant to blood flow simulations and to assess it through a careful validation against experimental data. We perform simulations of a benchmark proposed by the FDA for fluid flow in an idealized medical device, under different flow regimes. The results are evaluated using metrics proposed in the literature and the findings are in very good agreement with the validation experiment.
Topics: Fluid Dynamics, Physics, Analysis of PDEs, Mathematics
Source: http://arxiv.org/abs/1701.02179
3
3.0
Jun 30, 2018
06/18
by
Jan Kunc; Martin Rejhon; Eduard Belas; Václav Dědič; Pavel Moravec; Jan Franc
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eye 3
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In recent years, graphene growth optimization has been one of the key routes towards large-scale, high-quality graphene production. We have measured in-situ residual gas content during epitaxial graphene growth on silicon carbide (SiC) to find detrimental factors of epitaxial graphene growth. The growth conditions in high vacuum and purified argon are compared. The grown epitaxial graphene is studied by Raman scattering mapping and mechanical strain, charge density, number of graphene layers...
Topics: Materials Science, Condensed Matter
Source: http://arxiv.org/abs/1701.02033
5
5.0
Jun 30, 2018
06/18
by
Marco Gramaglia; Marco Fiore; Alberto Tarable; Albert Banchs
texts
eye 5
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Mobile network operators can track subscribers via passive or active monitoring of device locations. The recorded trajectories offer an unprecedented outlook on the activities of large user populations, which enables developing new networking solutions and services, and scaling up studies across research disciplines. Yet, the disclosure of individual trajectories raises significant privacy concerns: thus, these data are often protected by restrictive non-disclosure agreements that limit their...
Topics: Cryptography and Security, Computers and Society, Computing Research Repository
Source: http://arxiv.org/abs/1701.02243
9
9.0
Jun 30, 2018
06/18
by
Urs Hollenstein; Hansjürg Schmutz; Josef Anton Agner; Marcel Sommavilla; Frédéric Merkt
texts
eye 9
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Frequency-modulation (FM) spectroscopy has been extended to the vacuum-ultraviolet (VUV) range of the electromagnetic spectrum. Coherent VUV laser radiation is produced by resonance-enhanced sum-frequency mixing ($\nu_{\mathrm{VUV}}=2\nu_{\mathrm{UV}}+\nu_2$) in Kr and Xe using two near-Fourier-transform-limited laser pulses of frequencies $\nu_{\mathrm{UV}}$ and $\nu_2$. Sidebands generated in the output of the second laser ($\nu_2$) using an electro-optical modulator operating at the...
Topics: Atomic Physics, Physics, Chemical Physics, Instrumentation and Detectors
Source: http://arxiv.org/abs/1701.02223
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49
Jun 30, 2018
06/18
by
Greg Yang
texts
eye 49
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In computational complexity, a complexity class is given by a set of problems or functions, and a basic challenge is to show separations of complexity classes $A \not= B$ especially when $A$ is known to be a subset of $B$. In this paper we introduce a homological theory of functions that can be used to establish complexity separations, while also providing other interesting consequences. We propose to associate a topological space $S_A$ to each class of functions $A$, such that, to separate...
Topics: Mathematics, Learning, Computing Research Repository, Computational Complexity, Combinatorics,...
Source: http://arxiv.org/abs/1701.02302
3
3.0
Jun 30, 2018
06/18
by
Sachini Jayasooriya; Mahyar Shirvanimoghaddam; Lawrence Ong; Sarah J. Johnson
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eye 3
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The focus of this paper is on the analysis and design of Raptor codes using a multi-edge framework. In this regard, we first represent the Raptor code as a multi-edge type low-density parity-check (METLDPC) code. This MET representation gives a general framework to analyze and design Raptor codes over a binary input additive white Gaussian noise channel using MET density evolution (MET-DE). We consider a joint decoding scheme based on the belief propagation (BP) decoding for Raptor codes in the...
Topics: Information Theory, Computing Research Repository, Mathematics
Source: http://arxiv.org/abs/1701.02415
5
5.0
Jun 30, 2018
06/18
by
Michael Fuchs; Hsien-Kuei Hwang
texts
eye 5
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We study the size and the external path length of random tries and show that they are asymptotically independent in the asymmetric case but strongly dependent with small periodic fluctuations in the symmetric case. Such an unexpected behavior is in sharp contrast to the previously known results on random tries that the size is totally positively correlated to the internal path length and that both tend to the same normal limit law. These two dependence examples provide concrete instances of...
Topics: Probability, Mathematics
Source: http://arxiv.org/abs/1701.02397
4
4.0
Jun 30, 2018
06/18
by
T. Szczepanski; V. K. Dugaev; J. Barnas; I. Martinez; J. P. Cascales; J. -Y. Hong; M. -T. Lin; F. G. Aliev
texts
eye 4
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We analyze shot noise in a magnetic tunnel junction with a two-level quantum dot attached to the magnetic electrodes. The considerations are limited to the case when some transport channels are suppressed at low temperatures. Coupling of the two dot's levels to the electrodes are assumed to be generally different and also spin-dependent. To calculate the shot noise we apply the approach based on the full counting statistics. The approach is used to account for experimental data obtained in...
Topics: Mesoscale and Nanoscale Physics, Condensed Matter
Source: http://arxiv.org/abs/1701.02253
3
3.0
Jun 30, 2018
06/18
by
Corey Harris; Yoav Len
texts
eye 3
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We discuss the classical problem of counting planes tangent to general canonical sextic curves at three points. We determine the number of real tritangents when such a curve is real. We then revisit a curve constructed by Emch with the greatest known number of real tritangents, and conversely construct a curve with very few real tritangents. Using recent results on the relation between algebraic and tropical theta characteristics, we show that the tropicalization of a canonical sextic curve has...
Topics: Algebraic Geometry, Combinatorics, Mathematics
Source: http://arxiv.org/abs/1701.02353
5
5.0
Jun 30, 2018
06/18
by
Jiri Kvasnicka; for the CALICE collaboration
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eye 5
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The data acquisition system (DAQ) for a highly granular analogue hadron calorimeter (AHCAL) for the future International Linear Collider is presented. The developed DAQ chain has several stages of aggregation and scales up to 8 million channels foreseen for the AHCAL detector design. The largest aggregation device, Link Data Aggregator, has 96 HDMI connectors, four Kintex7 FPGAs and a central Zynq System-On-Chip. Architecture and performance results are shown in detail. Experience from DESY...
Topics: Physics, High Energy Physics - Experiment, Instrumentation and Detectors
Source: http://arxiv.org/abs/1701.02232
3
3.0
Jun 30, 2018
06/18
by
Wiley S. Morgan; Gus L. W. Hart; Rodney W. Forcade
texts
eye 3
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Modeling potential alloys requires the exploration of all possible configurations of atoms. Additionally, modeling the thermal properties of materials requires knowledge of the possible ways of displacing the atoms. One solution to finding all symmetrically unique configurations and displacements is to generate the complete list of possible configurations and remove those that are symmetrically equivalent. This approach, however, suffers from the combinatorial explosion that happens when the...
Topics: Materials Science, Condensed Matter
Source: http://arxiv.org/abs/1701.02382
7
7.0
Jun 30, 2018
06/18
by
Swanand Kadhe; Robert Calderbank
texts
eye 7
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A locally repairable code with availability has the property that every code symbol can be recovered from multiple, disjoint subsets of other symbols of small size. In particular, a code symbol is said to have $(r,t)$-availability if it can be recovered from $t$ disjoint subsets, each of size at most $r$. A code with availability is said to be 'rate-optimal', if its rate is maximum among the class of codes with given locality, availability, and alphabet size. This paper focuses on rate-optimal...
Topics: Information Theory, Computing Research Repository, Mathematics
Source: http://arxiv.org/abs/1701.02456
3
3.0
Jun 30, 2018
06/18
by
L. Haegel
texts
eye 3
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The T2K experiment is a long-baseline accelerator neutrino experiment using a near detector complex ND280 and a far detector, Super-Kamiokande. Neutrino interactions are detected by Cherenkov light in Super-Kamiokande in order to measure neutrino oscillation parameters. The accuracy of the oscillation parameter measurements depends on our knowledge of neutrino interactions, the neutrino flux and the detector response. ND280 is composed of a tracker and several sub-detectors designed to...
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1701.02559
4
4.0
Jun 30, 2018
06/18
by
H. Hartman; L. Engstrom; H. Lundberg; H. Nilsson; P. Quinet; V. Fivet; P. Palmeri; G. Malcheva; K. Blagoev
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This work reports new experimental radiative lifetimes and calculated oscillator strengths for transitions from 3d8 4d levels of astrophysical interest in singly ionized nickel. Radiative lifetimes of seven high-lying levels of even parity in Ni II (98400 -100600 cm-1) have been measured using the time-resolved laser-induced fluorescence method. Two-step photon excitation of ions produced by laser ablation has been utilized to populate the levels. Theoretical calculations of the radiative...
Topics: Atomic Physics, Physics, Solar and Stellar Astrophysics, Astrophysics
Source: http://arxiv.org/abs/1701.02480
4
4.0
Jun 30, 2018
06/18
by
Heinz-Jürgen Schmidt
texts
eye 4
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We formulate part I of a rigorous theory of ground states for classical, finite, Heisenberg spin systems. The main result is that all ground states can be constructed from the eigenvectors of a real, symmetric matrix with entries comprising the coupling constants of the spin system as well as certain Lagrange parameters. The eigenvectors correspond to the unique maximum of the minimal eigenvalue considered as a function of the Lagrange parameters. However, there are rare cases where all ground...
Topics: Condensed Matter, Mathematical Physics, Other Condensed Matter, Mathematics
Source: http://arxiv.org/abs/1701.02489
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41
Jun 30, 2018
06/18
by
Daniel J. Hernández; Jack Jeffries
texts
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This article is concerned with the asymptotic behavior of certain sequences of ideals in rings of prime characteristic. These sequences, which we call $p$-families of ideals, are ubiquitous in prime characteristic commutative algebra (e.g., they occur naturally in the theories of tight closure, Hilbert-Kunz multiplicity, and $F$-signature). We associate to each $p$-family of ideals an object in Euclidean space that is analogous to the Newton-Okounkov body of a graded family of ideals, which we...
Topics: Algebraic Geometry, Commutative Algebra, Mathematics
Source: http://arxiv.org/abs/1701.02575
7
7.0
Jun 30, 2018
06/18
by
Ralph Stöhr
texts
eye 7
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For $c\geq 2$, the free centre-by-(nilpotent-of-class-c-1)-by abelian Lie ring on a set $X$ is the quotient $L/[(L')^c,L]$ where $L$ is the free Lie ring on $X$, and $(L')^c$ denotes the $c$th term of the lower central series of the derived ideal $L'=L^2$ of $L$. In this paper we give a complete description of the torsion subgroup of its additive group in the case where $|X|=2$ and $c$ is a prime number.
Topics: Rings and Algebras, Mathematics
Source: http://arxiv.org/abs/1701.02594
6
6.0
Jun 30, 2018
06/18
by
J. R. Callingham; R. D. Ekers; B. M. Gaensler; J. L. B. Line; N. Hurley-Walker; E. M. Sadler; S. J. Tingay; P. J. Hancock; M. E. Bell; K. S. Dwarakanath; B. -Q. For; T. M. O. Franzen; L. Hindson; M. Johnston-Hollitt; A. D. Kapinska; E. Lenc; B. McKinley; J. Morgan; A. R. Offringa; P. Procopio; L. Staveley-Smith; R. B. Wayth; C. Wu; Q. Zheng
texts
eye 6
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We present a sample of 1,483 sources that display spectral peaks between 72 MHz and 1.4 GHz, selected from the GaLactic and Extragalactic All-sky Murchison Widefield Array (GLEAM) survey. The GLEAM survey is the widest fractional bandwidth all-sky survey to date, ideal for identifying peaked-spectrum sources at low radio frequencies. Our peaked-spectrum sources are the low frequency analogues of gigahertz-peaked spectrum (GPS) and compact-steep spectrum (CSS) sources, which have been...
Topics: Astrophysics of Galaxies, Astrophysics, High Energy Astrophysical Phenomena
Source: http://arxiv.org/abs/1701.02771
6
6.0
Jun 30, 2018
06/18
by
Vladimir Kadets; Miguel Martin; Javier Meri; Antonio Perez
texts
eye 6
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The aim of this manuscript is to study \emph{spear operators}: bounded linear operators $G$ between Banach spaces $X$ and $Y$ satisfying that for every other bounded linear operator $T:X\longrightarrow Y$ there exists a modulus-one scalar $\omega$ such that $$ \|G + \omega\,T\|=1+ \|T\|. $$ To this end, we introduce two related properties, one weaker called the alternative Daugavet property (if rank-one operators $T$ satisfy the requirements), and one stronger called lushness, and we develop a...
Topics: Functional Analysis, Mathematics
Source: http://arxiv.org/abs/1701.02977
7
7.0
Jun 30, 2018
06/18
by
Johan Jonasson
texts
eye 7
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Markov chain Monte Carlo (MCMC) algorithms are ubiquitous in probability theory in general and in machine learning in particular. A Markov chain is devised so that its stationary distribution is some probability distribution of interest. Then one samples from the given distribution by running the Markov chain for a "long time" until it appears to be stationary and then collects the sample. However these chains are often very complex and there are no theoretical guarantees that...
Topics: Learning, Machine Learning, Statistics, Computing Research Repository
Source: http://arxiv.org/abs/1701.02960
4
4.0
Jun 30, 2018
06/18
by
Krishnendu Chatterjee; Hongfei Fu
texts
eye 4
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We study the termination problem for nondeterministic recursive probabilistic programs. First, we show that a ranking-supermartingales-based approach is both sound and complete for bounded terminiation (i.e., bounded expected termination time over all schedulers). Our result also clarifies previous results which claimed that ranking supermartingales are not a complete approach even for nondeterministic probabilistic programs without recursion. Second, we show that conditionally...
Topics: Programming Languages, Computing Research Repository
Source: http://arxiv.org/abs/1701.02944
6
6.0
Jun 30, 2018
06/18
by
Andreas Schruba; Adam K. Leroy; J. M. Diederik Kruijssen; Frank Bigiel; Alberto D. Bolatto; W. J. G. de Blok; Linda Tacconi; Ewine F. van Dishoeck; Fabian Walter
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eye 6
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We present the ALMA survey of CO(2-1) emission from the 1/5 solar metallicity, Local Group dwarf galaxy NGC 6822. We achieve high (0.9 arcsec ~ 2 pc) spatial resolution while covering large area: four 250 pc x 250 pc regions that encompass ~2/3 of NGC 6822's star formation. In these regions, we resolve ~150 compact CO clumps that have small radii (~2-3 pc), narrow line width (~1 km/s), and low filling factor across the galaxy. This is consistent with other recent studies of low metallicity...
Topics: Astrophysics of Galaxies, Astrophysics
Source: http://arxiv.org/abs/1701.02748
6
6.0
Jun 30, 2018
06/18
by
Cheuk Ting Li; Abbas El Gamal
texts
eye 6
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This paper shows that for any random variables $X$ and $Y$, it is possible to represent $Y$ as a function of $(X,Z)$ such that $Z$ is independent of $X$ and $I(X;Z|Y)\le\log(I(X;Y)+1)+4$. We use this strong functional representation lemma (SFRL) to establish a tighter bound on the rate needed for one-shot exact channel simulation than was previously established by Harsha et. al., and to establish achievability results for one-shot variable-length lossy source coding, multiple description coding...
Topics: Information Theory, Computing Research Repository, Mathematics
Source: http://arxiv.org/abs/1701.02827
4
4.0
Jun 30, 2018
06/18
by
James D. Siverns; Xiao Li; Qudsia Quraishi
texts
eye 4
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Trapped ions are excellent candidates for quantum nodes, as they possess many desirable features of a network node including long-lifetimes, on-site processing capability and produce photonic flying qubits. However, unlike classical networks in which data may be transmitted in optical fibers and the range of communication readily extended with amplifiers, quantum systems often emit photons that have limited propagation range in optical fibers and, by virtue of the nature of a quantum state,...
Topic: Quantum Physics
Source: http://arxiv.org/abs/1701.02783
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8.0
Jun 30, 2018
06/18
by
J. I. Katz
texts
eye 8
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In a recent paper in Scientific Reports, Burridge \& Linden misinterpret the Mpemba effect as a statement about the rate of cooling of liquid water, when it is in fact a statement about the rate of freezing of water. Debunking an obviously absurd claim about cooling, they miss the significant effect, its only quantitative experimental study and a theoretical argument that explains the effect and predicts that it occurs only for "hard" water (water with significant dissolved Mg and...
Topics: Physics, Statistical Mechanics, Condensed Matter, Popular Physics
Source: http://arxiv.org/abs/1701.03219
4
4.0
Jun 30, 2018
06/18
by
Pingshan Li; Min Xu
texts
eye 4
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The balanced hypercube, $BH_n$, is a variant of hypercube $Q_n$. Zhou et al. [Inform. Sci. 300 (2015) 20-27] proposed an interesting problem that whether there is a fault-free Hamiltonian cycle in $BH_n$ with each vertex incident to at least two fault-free edges. In this paper, we consider this problem and show that each fault-free edge lies on a fault-free Hamiltonian cycle in $BH_n$ after no more than $4n-5$ faulty edges occur if each vertex is incident with at least two fault-free edges for...
Topics: Combinatorics, Mathematics
Source: http://arxiv.org/abs/1701.03216
3
3.0
Jun 30, 2018
06/18
by
Hirohumi Sawayanagi
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The effect of the Gribov horizon in Euclidean $SU(2)$ gauge theory is studied. Gauge fields on the Gribov horizon yield zero modes of ghosts and anti-ghosts. We show these zero modes can produce additional ghost interactions, and the Landau gauge changes to a nonlinear gauge effectively. In the infrared limit, however, the Landau gauge is recovered, and ghost zero modes may appear again. We show ghost condensation happens in the nonlinear gauge, and the zero mode repetition is avoided.
Topic: High Energy Physics - Theory
Source: http://arxiv.org/abs/1701.03239
4
4.0
Jun 30, 2018
06/18
by
Anthony Martin; Thiago Guerreiro; Alexey Tiranov; Sébastien Designolle; Florian Fröwis; Nicolas Brunner; Marcus Huber; Nicolas Gisin
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eye 4
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High-dimensional entanglement offers promising perspectives in quantum information science. In practice, however, the main challenge is to devise efficient methods to characterize high-dimensional entanglement, based on the available experimental data which is usually rather limited. Here we report the characterization and certification of high-dimensional entanglement in photon pairs, encoded in temporal modes. Building upon recently developed theoretical methods, we certify an entanglement of...
Topic: Quantum Physics
Source: http://arxiv.org/abs/1701.03269
3
3.0
Jun 30, 2018
06/18
by
Yutaka Nagashima
texts
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Despite the recent progress in automatic theorem provers, proof engineers are still suffering from the lack of powerful proof automation. In this position paper we first report our proof strategy language based on a meta-tool approach. Then, we propose an AI-based approach to drastically improve proof automation for Isabelle, while identifying three major challenges we plan to address for this objective.
Topics: Artificial Intelligence, Computing Research Repository
Source: http://arxiv.org/abs/1701.03037
4
4.0
Jun 30, 2018
06/18
by
Miroslav Shaltev; Jan-Hendrik Zab; Philipp Kemkes; Stefan Siersdorfer; Sergej Zerr
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eye 4
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Social graph construction from various sources has been of interest to researchers due to its application potential and the broad range of technical challenges involved. The World Wide Web provides a huge amount of continuously updated data and information on a wide range of topics created by a variety of content providers, and makes the study of extracted people networks and their temporal evolution valuable for social as well as computer scientists. In this paper we present SocGraph - an...
Topics: Information Retrieval, Physics, Computing Research Repository, Social and Information Networks,...
Source: http://arxiv.org/abs/1701.03277
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6.0
Jun 30, 2018
06/18
by
Ruotian Luo; Gregory Shakhnarovich
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We consider generation and comprehension of natural language referring expression for objects in an image. Unlike generic "image captioning" which lacks natural standard evaluation criteria, quality of a referring expression may be measured by the receiver's ability to correctly infer which object is being described. Following this intuition, we propose two approaches to utilize models trained for comprehension task to generate better expressions. First, we use a comprehension module...
Topics: Computing Research Repository, Computer Vision and Pattern Recognition
Source: http://arxiv.org/abs/1701.03439
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27
Jun 30, 2018
06/18
by
Raimundas Vidunas; Jiro Sekiguchi
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Several kinds of differential relations for polynomial components of almost Belyi maps are presented. Saito's theory of free divisors give particularly interesting (yet conjectural) logarithmic action of vector fields. The differential relations implied by Kitaev's construction of algebraic Painleve VI solutions through pull-back transformations are used to compute almost Belyi maps for the pull-backs giving all genus 0 and 1 Painleve VI solutions in the Lisovyy-Tykhyy classification.
Topics: Algebraic Geometry, Mathematics
Source: http://arxiv.org/abs/1701.03302
4
4.0
Jun 30, 2018
06/18
by
F. Grundahl; M. Fredslund Andersen; J. Christensen-Dalsgaard; V. Antoci; H. Kjeldsen; R. Handberg; G. Houdek; T. R. Bedding; P. L. Pallé; J. Jessen-Hansen; V. Silva Aguirre; T. R. White; S. Frandsen; S. Albrecht; M. I. Andersen; T. Arentoft; K. Brogaard; W. J. Chaplin; K. Harpsøe; U. G. Jørgensen; I. Karovicova; C. Karoff; P. Kjærgaard Rasmussen; M. N. Lund; M. Sloth Lundkvist; J. Skottfelt; A. Norup Sørensen; R. Tronsgaard; E. Weiss
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We report the first asteroseismic results obtained with the Hertzsprung SONG Telescope from an extensive high-precision radial-velocity observing campaign of the subgiant muHerculis. The data set was collected during 215 nights in 2014 and 2015. We detected a total of 49 oscillation modes with l values from 0 to 3, including some l = 1 mixed modes. Based on the rotational splitting observed in l = 1 modes, we determine a rotational period of 52 days and a stellar inclination angle of 63...
Topics: Solar and Stellar Astrophysics, Astrophysics
Source: http://arxiv.org/abs/1701.03365
7
7.0
Jun 30, 2018
06/18
by
Run-Hui Li; Cai-Dian Lü; Wei Wang; Fu-Sheng Yu; Zhi-Tian Zou
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Doubly-heavy baryons, with two heavy and one light quarks, are expected to exist in QCD and their masses have been predicted in the quark model. However their existence is not well established so far in experiment. In this work, we explore the possibility of searching for $\Xi_{bc}$ and $\Xi_{cc}^{+}$ in the $W$-exchange processes, $\Xi_{bc}^{0}\to pK^{-}$ and $\Xi_{cc}^{+}\to \Sigma_{c}^{++}(2520)K^{-}$. On the basis of perturbative calculations, we estimate the branching ratio of the first...
Topics: High Energy Physics - Experiment, High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1701.03284
7
7.0
Jun 30, 2018
06/18
by
Ce Xu
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In this paper, we obtain some formulas for double nonlinear Euler sums involving harmonic numbers and alternating harmonic numbers. By using these formulas, we give new closed form sums of several quadratic Euler series through Riemann zeta values, polylogarithm functions and linear sums. Furthermore, some relationships between Euler sums and integrals of polylogarithm functions are established.
Topics: Number Theory, Mathematics
Source: http://arxiv.org/abs/1701.03724
4
4.0
Jun 30, 2018
06/18
by
Fang-Qi Chen; J. Luis Egido
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The deformation parameters beta and gamma together with the two-quasiparticle excitations are taken into account, for the first time, as coordinates within a symmetry conserving (angular momentum and particle number) generator coordinate method. The simultaneous consideration of collective as well as single particle degrees of freedom allows us to describe soft and rigid nuclei as well as the transition region in between. We apply the new theory to the study of the spectra and transition...
Topic: Nuclear Theory
Source: http://arxiv.org/abs/1701.03650
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4.0
Jun 30, 2018
06/18
by
Jiangyong Jia; Mingliang Zhou; Adam Trzupek
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Multi-particle azimuthal cumulants, often used to study collective flow in high-energy heavy-ion collisions, have recently been applied in small collision systems such as pp and p+A to extract the second-order azimuthal harmonic flow v2. Recent observation of four-, six- and eight-particle cumulants with "correct sign" c_2{4} 0, c_2{8}
Topics: Nuclear Theory, Nuclear Experiment
Source: http://arxiv.org/abs/1701.03830
8
8.0
Jun 30, 2018
06/18
by
Esteban Andruchow; Gustavo Corach
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We study the pairs of projections $$ P_If=\chi_If ,\ \ Q_Jf= \left(\chi_J \hat{f}\right)\check{\ } , \ \ f\in L^2(\mathbb{R}^n), $$ where $I, J\subset \mathbb{R}^n$ are sets of finite Lebesgue measure, $\chi_I, \chi_J$ denote the corresponding characteristic functions and $\hat{\ } , \check{\ }$ denote the Fourier-Plancherel transformation $L^2(\mathbb{R}^n)\to L^2(\mathbb{R}^n)$ and its inverse. These pairs of projections have been widely studied by several authors in connection with the...
Topics: Functional Analysis, Mathematics
Source: http://arxiv.org/abs/1701.03733
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5.0
Jun 30, 2018
06/18
by
Romy H. S. Budhi
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In this work we investigate a inflationary scenario generated by a large scalar field $\phi$ that non-minimally couples to a $f(R)$ modified gravity model. For a Starobinsky's like model, it is found that along a particular flat direction, the scalar potential takes a simple form $V = (M_p^4/4) [V(\phi)/\alpha(\phi)^2]$ where $\alpha(\phi)$ is a non-minimal coupling to Ricci scalar $R$ in the model. The inflation, therefore, is effectively represented as a single field inflaton scenario. For a...
Topics: General Relativity and Quantum Cosmology, High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1701.03814
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5.0
Jun 30, 2018
06/18
by
Yanpeng Yang; Jihong Park; Ki Won Sung
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In this paper, we investigate the impact of network densification on the performance in terms of downlink signal-to-interference (SIR) coverage probability and network area spectral efficiency (ASE). A sophisticated bounded dual-slope path loss model and practical user equipment (UE) densities are incorporated in the analysis, which have never been jointly considered before. By using stochastic geometry, we derive an integral expression along with closed-form bounds of the coverage probability...
Topics: Networking and Internet Architecture, Information Theory, Computing Research Repository, Mathematics
Source: http://arxiv.org/abs/1701.04065
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3.0
Jun 30, 2018
06/18
by
Micaela Fedele; Cecilia Vernia
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In this paper we solve the inverse problem for a class of mean field models (Curie-Weiss model and its multi-species version) when multiple thermodynamic states are present, as in the low temperature phase where the phase space is clustered. The inverse problem consists in reconstructing the model parameters starting from configuration data generated according to the distribution of the model. We show that the application of the inversion procedure without taking into account the presence of...
Topics: Statistical Mechanics, Condensed Matter
Source: http://arxiv.org/abs/1701.04040
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6.0
Jun 30, 2018
06/18
by
M Surendran; S Natarajan; SPA Bordas; GS Palani
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The extended finite element method (XFEM) was introduced in 1999 to treat problems involving discontinuities with no or minimal remeshing through appropriate enrichment functions. This enables elements to be split by a discontinuity, strong or weak and hence requires the integration of discontinuous functions or functions with discontinuous derivatives over elementary volumes. Moreover, in the case of open surfaces and singularities, special, usually non-polynomial functions must also be...
Topics: Numerical Analysis, Mathematics
Source: http://arxiv.org/abs/1701.03997
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7.0
Jun 30, 2018
06/18
by
Andronikos Paliathanasis
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A fourth-order theory of gravity is considered which in terms of dynamics has the same degrees of freedom and number of constraints as those of scalar-tensor theories. In addition it admits a canonical point-like Lagrangian description. We study the critical points of the theory and we show that it can describe the matter epoch of the universe and that two accelerated phases can be recovered one of which describes a de Sitter universe. Finally for some models exact solutions are presented.
Topics: General Relativity and Quantum Cosmology, Mathematics, Mathematical Physics, Cosmology and...
Source: http://arxiv.org/abs/1701.04360
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8.0
Jun 30, 2018
06/18
by
Kazumasa Iida; Hikaru Sato; Chiara Tarantini; Jens Hänisch; Jan Jaroszynski; Hidenori Hiramatsu; Bernhard Holzapfel; Hideo Hosono
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High temperature (high-Tc) superconductors like cuprates have superior critical current properties in magnetic fields over other superconductors. However, superconducting wires for high-field-magnet applications are still dominated by low-Tc Nb3Sn due probably to cost and processing issues. The recent discovery of a second class of high-Tc materials, Fe-based superconductors, may provide another option for high-field-magnet wires. In particular, AEFe2As2 (AE: Alkali earth elements, AE-122) is...
Topics: Condensed Matter, Superconductivity
Source: http://arxiv.org/abs/1701.04154
