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Arxiv.org
by Karen L. Collins; Ann Trenk
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Nordhaus and Gaddum proved, for any graph G, that the chromatic number of G plus the chromatic number of G complement is less than or equal to the number of vertices in G plus 1. Finck characterized the class of graphs that satisfy equality in this bound. In this paper, we provide a new characterization of this class of graphs, based on vertex degrees, which yields a new polynomial-time recognition algorithm and efficient computation of the chromatic number of graphs in this class. Our...
Source: http://arxiv.org/abs/1203.5765v1
Occupy Wall Street Flickr Archive
by Lily Rothrock
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Topics: owswest, occupy, occupy wall street, j20, ows, occupysf, protest, san francisco
Source: http://www.flickr.com/photos/lilyrhoads/6734927009/
Occupy Wall Street Flickr Archive
by Lily Rothrock
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Topics: owswest, occupy, occupy wall street, j20, ows, occupysf, protest, san francisco
Source: http://www.flickr.com/photos/lilyrhoads/6734943617/
Occupy Wall Street Flickr Archive
by Lily Rothrock
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Topics: owswest, occupy, occupy wall street, j20, ows, occupysf, protest, san francisco
Source: http://www.flickr.com/photos/lilyrhoads/6734910491/
Arxiv.org
by XENON100 Collaboration; E. Aprile; K. Arisaka; F. Arneodo; A. Askin; L. Baudis; A. Behrens; E. Brown; J. M. R. Cardoso; B. Choi; D. Cline; S. Fattori; A. D. Ferella; K. L. Giboni; A. Kish; C. W. Lam; R. F. Lang; K. E. Lim; J. A. M. Lopes; T. Marrodan Undagoitia; Y. Mei; A. J. Melgarejo Fernandez; K. Ni; U. Oberlack; S. E. A. Orrigo; E. Pantic; G. Plante; A. C. C. Ribeiro; R. Santorelli; J. M. F. dos Santos; M. Schumann; P. Shagin; A. Teymourian; E. Tziaferi; H. Wang; M. Yamashita
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The XENON100 dark matter experiment uses liquid xenon (LXe) in a time projection chamber (TPC) to search for Xe nuclear recoils resulting from the scattering of dark matter Weakly Interacting Massive Particles (WIMPs). In this paper we present a detailed description of the detector design and present performance results, as established during the commissioning phase and during the first science runs. The active target of XENON100 contains 62 kg of LXe, surrounded by an LXe veto of 99 kg, both...
Source: http://arxiv.org/abs/1107.2155v2
Arxiv.org
by Amir Houmansadr; Nikita Borisov
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Recent research has made great strides in the field of detecting botnets. However, botnets of all kinds continue to plague the Internet, as many ISPs and organizations do not deploy these techniques. We aim to mitigate this state by creating a very low-cost method of detecting infected bot host. Our approach is to leverage the botnet detection work carried out by some organizations to easily locate collaborating bots elsewhere. We created BotMosaic as a countermeasure to IRC-based botnets....
Source: http://arxiv.org/abs/1203.1568v2
Arxiv.org
by Sergey V. Smirnov
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Integrable cut-off constraints for semidiscrete Toda lattice are studied in this paper. Lax presentation for semidiscrete analog of the $C$-series Toda lattice is obtained. Nonlocal variables that allow to express symmetries of the infinite semidiscrete lattice are introduced and cut-off constraints or a certain type compatible with symmetries of the infinite lattice are classified.
Source: http://arxiv.org/abs/1203.1764v1
Arxiv.org
by Gia Dvali; Cesar Gomez
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According to the standard view classically black holes carry no hair, whereas quantum hair is at best exponentially weak. We show that suppression of hair is an artifact of the semi-classical treatment and that in the quantum picture hair appears as an inverse mass-square effect. Such hair is predicted in the microscopic quantum description in which a black hole represents a self-sustained leaky Bose-condensate of N soft gravitons. In this picture the Hawking radiation is the quantum depletion...
Source: http://arxiv.org/abs/1203.6575v1
Occupy Wall Street Flickr Archive
by Lily Rothrock
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Topics: owswest, occupy, occupy wall street, j20, ows, occupysf, protest, san francisco
Source: http://www.flickr.com/photos/lilyrhoads/6734867153/
Occupy Wall Street Flickr Archive
by Lily Rothrock
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Topics: owswest, occupy, occupy wall street, j20, ows, occupysf, protest, san francisco
Source: http://www.flickr.com/photos/lilyrhoads/6734921537/
Occupy Wall Street Flickr Archive
by Lily Rothrock
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Topics: owswest, occupy, occupy wall street, j20, ows, occupysf, protest, san francisco
Source: http://www.flickr.com/photos/lilyrhoads/6734906651/
Occupy Wall Street Flickr Archive
by Lily Rothrock
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Topics: owswest, occupy, occupy wall street, j20, ows, occupysf, protest, san francisco
Source: http://www.flickr.com/photos/lilyrhoads/6734919597/
Flooved
by Christina Goldschmidt
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These notes are intended to complement the contents of the lectures. They contain more material than the lectures and, in particular, a few more examples. You are nonetheless strongly encouraged to attend all of the lectures. An original version of the �rst part of these notes was written by Alison Etheridge and I have also made extensive use of notes by Neil Laws and Jonathan Marchini.
Topics: Maths, Mathematics
Source: http://www.flooved.com/reader/1092
Flooved
by Reinhard Diestel
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This is the electronic �professional edition� of the Springer book "Graph Theory", from their series Graduate Texts in Mathematics, vol. 173.... this book o_ers an introduction to the theory of graphs as part of (pure) mathematics; it contains neither explicit algorithms nor �real world� applications. My hope is that the potential for depth gained by this restriction in scope will serve students of computer science as much as their peers in mathematics...
Topics: Maths, Graph Theory, Basics, Connectivity and Matchings, Extremal Graph Theory, Eigenvalue Methods,...
Source: http://www.flooved.com/reader/3447
Old Radio Times
by Old Time Radio Researchers
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Old Radio Times issue 2012 05-06 May Jun. This magazine is produced by the Old Time Radio Researchers, on the web at otrr.org. The uploader disclaims all responsibility regarding the accuracy, completeness and rights with respect to anything contained in . This magazine.
Topics: otrr, old, radio, old radio times, OTR, researchers, nostalgia
Arxiv.org
by D. A. Trifonov
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Nonlinear pseudo-fermions of degree n (n-pseudo-fermions) are introduced as (pseudo) particles with creation and annihilation operators $a$ and $b$, $b \neq a^\dagger$, obeying the simple nonlinear anticommutation relation $ab + b^n a^n = 1$. The (n+1)-order nilpotency of these operators follows from the existence of unique (up to a bi-normalization factor) $a$-vacuum. Supposing appropriate (n+1)-order nilpotent para-Grassmann variables and integration rules the sets of n-pseudo-fermion number...
Source: http://arxiv.org/abs/1203.3937v3
Arxiv.org
by Mario Bessa; Celia Ferreira; Jorge Rocha
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In this paper we contribute to the generic theory of Hamiltonians by proving that there is a C2-residual R in the set of C2 Hamiltonians on a closed symplectic manifold M, such that, for any H in R, there is an open and dense set S(H) in H(M) such that, for every e in S(H), the Hamiltonian level (H,e) is topologically mixing.
Source: http://arxiv.org/abs/1203.3849v1
Arxiv.org
by Jesper Goor Pedersen; Thomas Garm Pedersen
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Much attention has been focused on ways of rendering graphene semiconducting. We study periodically gated graphene in a tight-binding model and find that, contrary to predictions based on the Dirac equation, it is possible to open a band gap at the Fermi level using electrostatic gating of graphene. However, comparing to other methods of periodically modulating graphene, namely perforated graphene structures, we find that the resulting band gap is significantly smaller. We discuss the intricate...
Source: http://arxiv.org/abs/1203.3629v1
Arxiv.org
by Guowu Meng
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Quantum theory and Lorentz structure are the twin pillars of fundamental physics today. With quantum theory kept and Lorentz structure replaced by Euclidean Jordan algebra --- a more fundamental structure, one naturally arrives at the notion of abstract fundamental matter particles. These abstract particles fall into distinct abstract universes according to their symmetry groups. If it is assumed that the charged particle count for such an abstract universe is 32, then this abstract universe...
Source: http://arxiv.org/abs/1203.3944v2
Arxiv.org
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Let $G=(V,E)$ be a supply graph and $H=(V,F)$ a demand graph defined on the same set of vertices. An assignment of capacities to the edges of $G$ and demands to the edges of $H$ is said to satisfy the \emph{cut condition} if for any cut in the graph, the total demand crossing the cut is no more than the total capacity crossing it. The pair $(G,H)$ is called \emph{cut-sufficient} if for any assignment of capacities and demands that satisfy the cut condition, there is a multiflow routing the...
Source: http://arxiv.org/abs/1203.4041v1
Arxiv.org
by Slawomir Dinew; Slawomir Kolodziej
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We prove a Liouville type theorem for entire maximal $m$-subharmonic functions in $\mathbb C^n$ with bounded gradient. This result, coupled with a standard blow-up argument, yields a (non-explicit) a priori gradient estimate for the complex Hessian equation on a compact K\"ahler manifold. This terminates the program, initiated by Hou, Ma and Wu, of solving the non-degenerate Hessian equation on such manifolds in full generality. We also obtain, using our previous work, continuous weak...
Source: http://arxiv.org/abs/1203.3995v1
Arxiv.org
by Yaroslav D. Sergeyev
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The First Hilbert problem is studied in this paper by applying two instruments: a new methodology distinguishing between mathematical objects and mathematical languages used to describe these objects; and a new numeral system allowing one to express different infinite numbers and to use these numbers for measuring infinite sets. Several counting systems are taken into consideration. It is emphasized in the paper that different mathematical languages can describe mathematical objects (in...
Source: http://arxiv.org/abs/1203.4141v1
Arxiv.org
by Shuang Wang; Wei Chen; Zhen-Qiang Yin; Yang Zhang; Tao Zhang; Hong-Wei Li; Fang-Xing Xu; Zheng Zhou; Yang Yang; Da-Jun Huang; Li-Jun Zhang; Fang-Yi Li; Dong Liu; Yong-Gang Wang; Guang-Can Guo; Zheng-Fu Han
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We propose a wavelength-saving topology of quantum key distribution(QKD) network based on passive optical elements, and report the field test of this network on the commercial telecom optical fiber. In this network, 5 nodes are supported with 2 wavelengths, and every two nodes can share secure keys directly at the same time. All QKD links in the network operate at the frequency of 20 MHz. We also characterized the insertion loss and crosstalk effects on the point-to-point QKD system after...
Source: http://arxiv.org/abs/1203.4321v1
A viewpoint article on the very interesting work of Biroli, Chamon, and Zamponi on superglasses. I further suggest how additional new superglass and "spin-superglass" phases of matter (the latter phases contain quenched disorder) and general characteristics may be proven as a theoretical proof of concept in various electronic systems. The new phases include: (1) superglasses of Cooper pairs, i.e., glassy superconductors, (2) superglass phases of quantum spins, and (3) superglasses of...
Source: http://arxiv.org/abs/1203.4648v1
Arxiv.org
by Stefano Zibetti; Anna Gallazzi; Stephane Charlot; Anna Pasquali; Daniele Pierini
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We present new spectro-photometric NIR observations of 16 post-starburst galaxies especially designed to test for the presence of strong carbon features of thermally pulsing AGB (TP-AGB) stars, as predicted by recent models of stellar population synthesis. Selection based on clear spectroscopic optical features indicating the strong predominance of stellar populations with ages between 0.5 and 1.5 Gyr and redshift around 0.2 allows us to probe the spectral region that is most affected by the...
Source: http://arxiv.org/abs/1203.4571v1
Arxiv.org
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In this paper we perform a detailed analysis of the effect of various approximations which have been used in the literature to compute the detection rates of compact binary coalescences for interferometric gravitational wave detectors. We evaluate the detection rates for the coalescence of BH-BH, NS-NS, and BH-NS binaries taking into account their specific statistical properties obtained from population synthesis models, the cosmic star formation rate history, and the effects of redshift on the...
Source: http://arxiv.org/abs/1203.5110v2
Arxiv.org
by Thiago E. Colla; Alexandre P. dos Santos; Yan Levin
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The thermodynamic properties of highly charged colloidal suspensions in contact with a salt reservoir are investigated in the framework of the Renormalized Jellium Model (RJM). It is found that the equation of state is very sensitive to the particular thermodynamic route used to obtain it. Specifically, the osmotic pressure calculated within the RJM using the contact value theorem can be very different from the pressure calculated using the Kirkwood-Buff fluctuation relations. On the other...
Source: http://arxiv.org/abs/1203.5275v2
Arxiv.org
by G. Datta; M. Ghosh
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The need for small area estimates is increasingly felt in both the public and private sectors in order to formulate their strategic plans. It is now widely recognized that direct small area survey estimates are highly unreliable owing to large standard errors and coefficients of variation. The reason behind this is that a survey is usually designed to achieve a specified level of accuracy at a higher level of geography than that of small areas. Lack of additional resources makes it almost...
Source: http://arxiv.org/abs/1203.5233v1
Arxiv.org
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Temporal communities result from a consistent partitioning of nodes across multiple snapshots of an evolving complex network that can help uncover how dense clusters in a network emerge, combine, split and decay with time. Current methods for finding communities in a single snapshot are not straightforwardly generalizable to finding temporal communities since the quality functions used for finding static communities have highly degenerate landscapes, and the eventual partition chosen among the...
Source: http://arxiv.org/abs/1203.5126v1
Arxiv.org
by Sergey V. Stepanov; Dmitry S. Zvezhinskiy; Vsevolod M. Byakov
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In application to positron annihilation spectroscopy, Ps atom is considered not as a point particle, but as a finite size e+ e- pair localized in a bubble-state in a medium. Variation of the internal Coulombic e+ -e- attraction vs. the bubble radius is estimated.
Source: http://arxiv.org/abs/1203.5385v1
Arxiv.org
by Alessandro Gnoatto
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We consider a short rate model, driven by a stochastic process on the cone of positive semidefinite matrices. We propose a new closed form solution for the pricing of zero-coupon bonds and interest-rate derivatives, based on the Cameron-Martin approach outlined in Gnoatto and Grasselli (2011). Moreover, we derive sufficient conditions ensuring that the model replicates normal, inverse or humped yield curves.
Source: http://arxiv.org/abs/1203.5513v1
Arxiv.org
by Hong-Bo Chen; Yi Zhou; You-Quan Li
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We study in this paper bond distortion effect on electric polarization in spiral multiferroic magnets based on cluster and chain models. The bond distortion break inversion symmetry and modify the $d$-$p$ hybridization. Consequently, it will affect electric polarization which can be divided into spin-current part and lattice-mediated part. The spin-current polarization can be written in terms of $\vec{e}_{i,j}\times(\vec{e}_{i}\times\vec{e}_{j}) $ and the lattice-mediated polarization exists...
Source: http://arxiv.org/abs/1203.5469v2
Arxiv.org
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An overview is given of recent advances in the nonequilibrium statistical mechanics of quantum systems and, especially, of time-reversal symmetry relations that have been discovered in this context. The systems considered are driven out of equilibrium by time-dependent forces or by coupling to large reservoirs of particles and energy. The symmetry relations are established for the exchange of energy and particles between the subsystem and its environment. These results have important...
Source: http://arxiv.org/abs/1203.5507v1
Arxiv.org
by Alexander G. Krause; Martin Winger; Tim D. Blasius; Qiang Lin; Oskar Painter
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The monitoring of accelerations is essential for a variety of applications ranging from inertial navigation to consumer electronics. The basic operation principle of an accelerometer is to measure the displacement of a flexibly mounted test mass; sensitive displacement measurement can be realized using capacitive, piezo-electric, tunnel-current, or optical methods. While optical readout provides superior displacement resolution and resilience to electromagnetic interference, current optical...
Source: http://arxiv.org/abs/1203.5730v1
Arxiv.org
by E. S. Battistelli; G. Amico; A. Baù; L. Bergé; É. Bréelle; R. Charlassier; S. Collin; A. Cruciani; P. de Bernardis; C. Dufour; L. Dumoulin; M. Gervasi; M. Giard; C. Giordano; Y. Giraud-Héraud; L. Guglielmi; J. -C. Hamilton; J. Landé; B. Maffei; M. Maiello; S. Marnieros; S. Masi; A. Passerini; F. Piacentini; M. Piat; L. Piccirillo; G. Pisano; G. Polenta; C. Rosset; M. Salatino; A. Schillaci; R. Sordini; S. Spinelli; A. Tartari; M. Zannoni
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Atmospheric emission is a dominant source of disturbance in ground-based astronomy at mm wavelengths. The Antarctic plateau is recognized to be an ideal site for mm and sub-mm observations, and the French/Italian base of Dome C is among the best sites on Earth for these observations. In this paper we present measurements, performed using the BRAIN-pathfinder experiment, at Dome C of the atmospheric emission in intensity and polarization at 150GHz, one of the best observational frequencies for...
Source: http://arxiv.org/abs/1203.5615v2
Arxiv.org
by Omar Dzagnidze
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Motivated by the general problem of extending the classical theory of holomorphic functions of a complex variable to the case of quater- nion functions, we give a notion of an H-derivative for functions of one quaternion variable. We show that the elementary quaternion func- tions introduced by Hamilton as well as the quaternion logarithm function possess such a derivative. We conclude by establishing rules for calculating H-derivatives.
Source: http://arxiv.org/abs/1203.5619v1
Arxiv.org
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We show that in a background of a sufficiently strong magnetic field the electroweak sector of the quantum vacuum exhibits superconducting and, simultaneously, superfluid properties due to magnetic-field-induced condensation of, respectively, W and Z bosons. The phase transition to the "tandem" superconductor--superfluid phase - which is weakly sensitive to the Higgs sector of the standard model - occurs at the critical magnetic field of 10^{20} Tesla. The superconductor-superfluid...
Source: http://arxiv.org/abs/1203.5963v1
Arxiv.org
by Favio Ezequiel Miranda-Perea; Lourdes del Carmen González-Huesca
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We present an extension of the second-order logic AF2 with iso-style inductive and coinductive definitions specifically designed to extract programs from proofs a la Krivine-Parigot by means of primitive (co)recursion principles. Our logic includes primitive constructors of least and greatest fixed points of predicate transformers, but contrary to the common approach, we do not restrict ourselves to positive operators to ensure monotonicity, instead we use the Mendler-style, motivated here by...
Source: http://arxiv.org/abs/1203.6158v1
Arxiv.org
by Sougata Pal; Simon Oechsner; Boris Bellalta; Miquel Oliver
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Interconnecting multiple sensor networks is a relatively new research field which has emerged in the Wireless Sensor Network domain. Wireless Sensor Networks (WSNs) have typically been seen as logically separate, and few works have considered interconnection and interaction between them. Interconnecting multiple heterogeneous sensor networks therefore opens up a new field besides more traditional research on, e.g., routing, self organization, or MAC layer development. Up to now, some approaches...
Source: http://arxiv.org/abs/1203.6316v2
Arxiv.org
by M. Schartmann; A. Burkert; Ch. Alig; S. Gillessen; R. Genzel; F. Eisenhauer; T. K. Fritz
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We investigate the origin and fate of the recently discovered gas cloud G2 close to the Galactic Center. Our hydrodynamical simulations focussing on the dynamical evolution of the cloud in combination with currently available observations favor two scenarios: a Compact Cloud which started around the year 1995 and a Spherical Shell of gas, with an apocenter distance within the disk(s) of young stars and a radius of a few times the size of the Compact Cloud. The former is able to explain the...
Source: http://arxiv.org/abs/1203.6356v2
Arxiv.org
by Debadi Chakraborty; J. Ravi Prakash; Leslie Yeo; James Friend
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A microfluidic device is constructed from PDMS with a single channel having a short section that is a thin flexible membrane, in order to investigate the complex fluid-structure interaction that arises between a flowing fluid and a deformable wall. Experimental measurements of membrane deformation and pressure drop are compared with predictions of two-dimensional and three-dimensional computational models which numerically solve the equations governing the elasticity of the membrane coupled...
Source: http://arxiv.org/abs/1203.6427v1
Arxiv.org
by Nahomi Kan; Koichiro Kobayashi; Kiyoshi Shiraishi
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The Nambu-Jona-Lasinio model with the mass matrix which appears in a deconstruction model is investigated. We consider two models. In Model A, a mass matrix belonging to a type used in dimensional deconstruction is introduced. In Model B, the four-fermion interaction has a structure of the matrix of the type of dimensional deconstruction. In these models, we find that generation of a dynamical fermion mass spectrum occurs in a strong coupling case.
Source: http://arxiv.org/abs/1203.6398v1
Arxiv.org
by Tullio Ceccherini-Silberstein; Michel Coornaert
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Following ideas developed by Misha Gromov, we investigate surjunctivity and reversibility properties of cellular automata defined over certain concrete categories.
Source: http://arxiv.org/abs/1203.6492v2
Arxiv.org
by Michael Benedikt; Pierre Bourhis; Clemens Ley
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We study verification of systems whose transitions consist of accesses to a Web-based data-source. An access is a lookup on a relation within a relational database, fixing values for a set of positions in the relation. For example, a transition can represent access to a Web form, where the user is restricted to filling in values for a particular set of fields. We look at verifying properties of a schema describing the possible accesses of such a system. We present a language where one can...
Source: http://arxiv.org/abs/1203.6403v1
Arxiv.org
by Carl M. Bender; Daniel W. Hook; S. P. Klevansky
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The non-Hermitian PT-symmetric quantum-mechanical Hamiltonian $H=p^2+x^2(ix)^\epsilon$ has real, positive, and discrete eigenvalues for all $\epsilon\geq 0$. These eigenvalues are analytic continuations of the harmonic-oscillator eigenvalues $E_n=2n+1$ (n=0, 1, 2, 3, ...) at $\epsilon=0$. However, the harmonic oscillator also has negative eigenvalues $E_n=-2n-1$ (n=0, 1, 2, 3, ...), and one may ask whether it is equally possible to continue analytically from these eigenvalues. It is shown in...
Source: http://arxiv.org/abs/1203.6590v1
Arxiv.org
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We show that any embedded minimal torus in S^3 is congruent to the Clifford torus. This answers a question posed by H.B. Lawson, Jr., in 1970.
Source: http://arxiv.org/abs/1203.6597v3
Arxiv.org
by Harald W. Griesshammer; Judith A. McGovern; Daniel R. Phillips; Gerald Feldman
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Compton scattering provides important insight into the structure of the nucleon. For photons up to about 300 MeV, it is parameterised by six dynamical dipole polarisabilities which characterise the response of the nucleon to a monochromatic photon of fixed frequency and multipolarity. Their zero-energy limit yields the well-known static electric and magnetic dipole polarisabilities \alpha and \beta, and the four dipole spin polarisabilities. Chiral Effective Field Theory (ChiEFT) describes...
Source: http://arxiv.org/abs/1203.6834v2
Arxiv.org
by Andre Walker-Loud; Carl E. Carlson; Gerald A. Miller
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We update the determination of the isovector nucleon electromagnetic self-energy, valid to leading order in QED. A technical oversight in the literature concerning the elastic contribution to Cottingham's formula is corrected and modern knowledge of the structure functions is used to precisely determine the inelastic contribution. We find \delta M_{p-n}^\gamma = 1.30(03)(47) MeV. The largest uncertainty arises from a subtraction term required in the dispersive analysis, which can be related to...
Source: http://arxiv.org/abs/1203.0254v2
Arxiv.org
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We complete the classification of smooth surfaces swept out by a 1-dimensional family of plane curves that do not form a fibration. As a consequence, we characterize manifolds swept out by a 1-dimensional family of hypersurfaces that do not form a fibration.
Source: http://arxiv.org/abs/1203.0213v1
Arxiv.org
by J. Fernando Barbero G.; Jerzy Lewandowski; Eduardo J. S. Villaseñor
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We give a short introduction to the approaches currently used to describe black holes in loop quantum gravity. We will concentrate on the classical issues related to the modeling of black holes as isolated horizons, give a short discussion of their canonical quantization by using loop quantum gravity techniques, and a description of the combinatorial methods necessary to solve the counting problems involved in the computation of the entropy.
Source: http://arxiv.org/abs/1203.0174v1
Arxiv.org
by Andreas-Stephan Elsenhans; Jörg Jahnel
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We report on our experiments and theoretical investigations concerning weak approximation and the transcendental Brauer-Manin obstruction for special Kummer surfaces.
Source: http://arxiv.org/abs/1203.0153v2
Arxiv.org
by Zhenning Cai; Yuwei Fan; Ruo Li
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In this paper, we propose a globally hyperbolic regularization to the general Grad's moment system in multi-dimensional spaces. Systems with moments up to an arbitrary order are studied. The characteristic speeds of the regularized moment system can be analytically given and only depend on the macroscopic velocity and the temperature. The structure of the eigenvalues and eigenvectors of the coefficient matrix is fully clarified. The regularization together with the properties of the resulting...
Source: http://arxiv.org/abs/1203.0376v1
Arxiv.org
by Gorazd Cvetic; Claudio Dib; C. S. Kim
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We study the rare decays of charged \pi\ mesons, \pi+ to e+ e+ \mu- anti-\nu_\mu\ and \pi+ to e+ \mu- e+ \nu_e, induced by a sterile neutrino N with a mass in the range m_\mu < m_N < m_\pi. The first process violates Lepton Number by two units and so occurs only if N is Majorana, while the second process conserves Lepton Number and occurs irrespective of the Majorana or Dirac character of N. We study a way to distinguish the Majorana vs. Dirac character of N in these processes using the...
Source: http://arxiv.org/abs/1203.0573v2
Arxiv.org
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We consider the problem of efficient simulation estimation of the density function at the tails, and the probability of large deviations for a sum of independent, identically distributed, light-tailed and non-lattice random vectors. The latter problem besides being of independent interest, also forms a building block for more complex rare event problems that arise, for instance, in queueing and financial credit risk modelling. It has been extensively studied in literature where state...
Source: http://arxiv.org/abs/1203.0817v2
Arxiv.org
by J. L. Albacete; J. G. Milhano; P. Quiroga-Arias; J. Rojo
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The very precise combined HERA data provides a testing ground in which the relevance of novel QCD regimes, other than the successful linear DGLAP evolution, in small-x inclusive DIS data can be ascertained. We present a study of the dependence of the AAMQS fits, based on the running coupling BK non-linear evolution equations (rcBK), on the fitted dataset. This allows for the identification of the kinematical region where rcBK accurately describes the data, and thus for the determination of its...
Source: http://arxiv.org/abs/1203.1043v2
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We study the scaling of the decoherence factor of a qubit (spin-1/2) using the central spin model in which the central spin (qubit) is globally coupled to a transverse XY spin chain. The aim here is to study the non-equilibrium generation of decoherence when the spin chain is driven across (along) quantum critical points (lines) and derive the scaling of the decoherence factor in terms of the driving rate and some of the exponents associated with the quantum critical points. Our studies show...
Source: http://arxiv.org/abs/1203.1186v2
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by Lian Tao; Philip Kaaret; Hua Feng; Fabien Grisé
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We report on UV and X-ray spectroscopy and broad-band optical observations of the ultraluminous X-ray source in Holmberg II. Fitting various stellar spectral models to the combined, non-simultaneous data set, we find that normal metallicity stellar spectra are ruled out by the data, while low metallicity, Z = 0.1 Z_{\odot}, late O-star spectra provide marginally acceptable fits, if we allow for the fact that X-ray ionization from the compact object may reduce or eliminate UV absorption/emission...
Source: http://arxiv.org/abs/1203.1086v1
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by John Abbott
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We present a new algorithm for refining a real interval containing a single real root: the new method combines characteristics of the classical Bisection algorithm and Newton's Iteration. Our method exhibits quadratic convergence when refining isolating intervals of simple roots of polynomials (and other well-behaved functions). We assume the use of arbitrary precision rational arithmetic. Unlike Newton's Iteration our method does not need to evaluate the derivative.
Source: http://arxiv.org/abs/1203.1227v1
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We consider a multiple-input-single-output (MISO) broadcast channel with mixed channel state information at the transmitter (CSIT) that consists of imperfect current CSIT and perfect outdated CSIT. Recent work by Kobayashi et al. presented a scheme which exploits both imperfect current CSIT and perfect outdated CSIT and achieves higher degrees of freedom (DoF) than possible with only imperfect current CSIT or only outdated CSIT individually. In this work, we further improve the achievable DoF...
Source: http://arxiv.org/abs/1203.1301v1
Arxiv.org
by A. Rebassa-Mansergas; M. Zorotovic; M. R. Schreiber; B. T. Gaensicke; J. Southworth; A. Nebot Gomez-Moran; C. Tappert; D. Koester; S. Pyrzas; C. Papadaki; L. Schmidtobreick; A. Schwope; O. Toloza
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Virtually all close compact binary stars are formed through common-envelope (CE) evolution. It is generally accepted that during this crucial evolutionary phase a fraction of the orbital energy is used to expel the envelope. However, it is unclear whether additional sources of energy, such as the recombination energy of the envelope, play an important role. Here we report the discovery of the second and third longest orbital period post-common envelope binaries (PCEBs) containing white dwarf...
Source: http://arxiv.org/abs/1203.1208v1
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by Ennio Arimondo; Donatella Ciampini; André Eckardt; Martin Holthaus; Oliver Morsch
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We analyze time-of-flight absorption images obtained with dilute Bose-Einstein con-densates released from shaken optical lattices, both theoretically and experimentally. We argue that weakly interacting, ultracold quantum gases in kilohertz-driven optical potentials constitute equilibrium systems characterized by a steady-state distri-bution of Floquet-state occupation numbers. Our experimental results consistently indicate that a driven ultracold Bose gas tends to occupy a single Floquet...
Source: http://arxiv.org/abs/1203.1259v2
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The effects of internal chemical pressure on electron doped iron arsenide superconductors are studied in the series Ba(Fe(1-y)Coy)2(As(1-x)Px)2. Combinations of both dopants induce superconductivity also in such areas where only one would not suffice, and can likewise move the system into an overdoped state, while no higher critical temperature than 31 K in BaFe2(As(1-x)Px)2 was found. The phase diagram gives no evidence of holes in BaFe2(As(1-x)Px)2 as suggested by recent photoemission...
Source: http://arxiv.org/abs/1203.1459v1
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by Derek D. Scott; Yogesh N. Joglekar
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We investigate the properties of an $N$-site tight-binding lattice with periodic boundary condition (PBC) in the presence of a pair of gain and loss impurities $\pm i\gamma$, and two tunneling amplitudes $t_0,t_b$ that are constant along the two paths that connect them. We show that the parity and time-reversal ($\mP\mT$)-symmetric phase of the lattice with PBC is robust, insensitive to the distance between the impurities, and that the critical impurity strength for PT-symmetry breaking is...
Source: http://arxiv.org/abs/1203.1345v1
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by Brandon C. Wood; Shreyas Y. Bhide; Debosruti Dutta; Vinay S. Kandagal; Amar Deep Pathak; Sudeep N. Punnathanam; K. G. Ayappa; Shobhana Narasimhan
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With a view towards optimizing gas storage and separation in crystalline and disordered nanoporous carbon-based materials, we use ab initio density functional theory calculations to explore the effect of chemical functionalization on gas binding to exposed edges within model carbon nanostructures. We test the geometry, energetics, and charge distribution of in-plane and out-of-plane binding of CO2 and CH4 to model zigzag graphene nanoribbons edge-functionalized with COOH, OH, NH2, H2PO3, NO2,...
Source: http://arxiv.org/abs/1203.1351v1
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by X. Y. Hu; N. A. Adams; C. -W. Shu
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In this work a simple method to enforce the positivity-preserving property for general high-order conservative schemes is proposed. The method keeps the original scheme unchanged and detects critical numerical fluxes which may lead to negative density and pressure, and then imposes a cut-off flux limiter to satisfy a sufficient condition for preserving positivity. Though an extra time-step size condition is required to maintain the formal order of accuracy, it is less restrictive than those in...
Source: http://arxiv.org/abs/1203.1540v5
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by Joan Bruna; Stéphane Mallat
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A wavelet scattering network computes a translation invariant image representation, which is stable to deformations and preserves high frequency information for classification. It cascades wavelet transform convolutions with non-linear modulus and averaging operators. The first network layer outputs SIFT-type descriptors whereas the next layers provide complementary invariant information which improves classification. The mathematical analysis of wavelet scattering networks explains important...
Source: http://arxiv.org/abs/1203.1513v2
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by N. Minkov; S. Drenska; M. Strecker; W. Scheid; H. Lenske
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A model assuming coherent quadrupole-octupole vibrations and rotations is applied to describe non-yrast energy sequences with alternating parity in several even-even nuclei from different regions, namely $^{152,154}$Sm, $^{154,156,158}$Gd, $^{236}$U and $^{100}$Mo. Within the model scheme the yrast alternating-parity band is composed by the members of the ground-state band and the lowest negative-parity levels with odd angular momenta. The non-yrast alternating-parity sequences unite levels of...
Source: http://arxiv.org/abs/1203.1873v1
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by Saif M Mohammad; Graeme Hirst
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The automatic ranking of word pairs as per their semantic relatedness and ability to mimic human notions of semantic relatedness has widespread applications. Measures that rely on raw data (distributional measures) and those that use knowledge-rich ontologies both exist. Although extensive studies have been performed to compare ontological measures with human judgment, the distributional measures have primarily been evaluated by indirect means. This paper is a detailed study of some of the...
Source: http://arxiv.org/abs/1203.1889v1
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by Josef Teichmann; Mario V. Wüthrich
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We present an arbitrage-free non-parametric yield curve prediction model which takes the full (discretized) yield curve as state variable. We believe that absence of arbitrage is an important model feature in case of highly correlated data, as it is the case for interest rates. Furthermore, the model structure allows to separate clearly the tasks of estimating the volatility structure and of calibrating market prices of risk. The empirical part includes tests on modeling assumptions, back...
Source: http://arxiv.org/abs/1203.2017v1
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by I. Poltoratska; P. von Neumann-Cosel; A. Tamii; T. Adachi; C. A. Bertulani; J. Carter; M. Dozono; H. Fujita; K. Fujita; Y. Fujita; K. Hatanaka; M. Itoh; T. Kawabata; Y. Kalmykov; A. M. Krumbholz; E. Litvinova; H. Matsubara; K. Nakanishi; R. Neveling; H. Okamura; H. J. Ong; B. Özel-Tashenov; V. Yu. Ponomarev; A. Richter; B. Rubio; H. Sakaguchi; Y. Sakemi; Y. Sasamoto; Y. Shimbara; Y. Shimizu; F. D. Smit; T. Suzuki; Y. Tameshige; J. Wambach; M. Yosoi; J. Zenihiro
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Scattering of protons of several hundred MeV is a promising new spectroscopic tool for the study of electric dipole strength in nuclei. A case study of 208Pb shows that at very forward angles J^pi = 1- states are strongly populated via Coulomb excitation. A separation from nuclear excitation of other modes is achieved by a multipole decomposition analysis of the experimental cross sections based on theoretical angular distributions calculated within the quasiparticle-phonon model. The B(E1)...
Source: http://arxiv.org/abs/1203.2155v2
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by Bojan Žunkovič; Tomaž Prosen
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We provide an explicit method for solving general markovian master equations for quadratic bosonic Hamiltonians with linear bath operators. As an example we consider a one-dimensional quantum harmonic oscillator chain coupled to thermal reservoirs at both ends of the chain. We derive an analytic solution of the Redfield master equation for homogeneous harmonic chain and recover classical results, namely, vanishing temperature gradient and constant heat current in the thermodynamic limit. In the...
Source: http://arxiv.org/abs/1203.2139v2
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by M. Prall; P. Renschler; F. Glück; A. Beglarian; H. Bichsel; L. Bornschein; Z. Chaoui; G. Drexlin; F. Fränkle; S. Görhardt; S. Mertens; M. Steidl; Th. Thümmler; S. Wüstling; C. Weinheimer; S. Zadorozhny
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The KArlsruhe TRItium Neutrino experiment, KATRIN, will determine the mass of the electron neutrino with a sensitivity of 0.2 eV (90% C.L.) via a measurement of the beta-spectrum of gaseous tritium near its endpoint of E_0 =18.57 keV. An ultra-low background of about b = 10 mHz is among the requirements to reach this sensitivity. In the KATRIN main beam-line two spectrometers of MAC-E filter type are used in a tandem configuration. This setup, however, produces a Penning trap which could lead...
Source: http://arxiv.org/abs/1203.2444v1
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by Chris Kapulkin; Peter LeFanu Lumsdaine; Vladimir Voevodsky
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We present an accessible account of Voevodsky's construction of a univalent universe of Kan fibrations.
Source: http://arxiv.org/abs/1203.2553v3
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by Anna Ferré-Mateu; Alexandre Vazdekis; Ignacio Trujillo; Patricia Sánchez-Blázquez; Elena Ricciardelli; Ignacio G. de la Rosa
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We characterize the kinematics, morphology, stellar populations and star formation histories of a sample of massive compact galaxies in the nearby Universe, which might provide a closer look to the nature of their high redshift (z > 1.0) massive counterparts. We find that nearby compact massive objects show elongated morphologies and are fast rotators. New high-quality long-slit spectra show that they have young mean luminosity-weighted ages ( < 2Gyr) and solar metallicities or above...
Source: http://arxiv.org/abs/1203.2623v1
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We study the Chow groups of smooth complex varieties $X$ which are fibred by varieties with small Chow groups, e.g. varieties fibred by low degree complete intersections or cellular varieties. As an application, we give new examples of smooth projective varieties satisfying conjectures on algebraic cycles such as the Hodge conjecture, the Lefschetz standard conjecture, Kimura's finite-dimensionality conjecture and Murre's conjectures. If $X$ is fibred by cellular varieties over a curve, then we...
Source: http://arxiv.org/abs/1203.2650v1
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by Frédéric Bayart
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We compute, for a compact set $K\subset\mathbb R^d$, the value of the upper and of the lower $L^q$-dimension of a typical probability measure with support contained in $K$, for any $q\in\mathbb R$. Different definitions of the "dimension" of $K$ are involved to compute these values, following $q\in\mathbb R$.
Source: http://arxiv.org/abs/1203.2813v1
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by Yosuke Takasu; Yutaka Saito; Yoshiro Takahashi; Mateusz Borkowski; Roman Ciuryło; Paul S. Julienne
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We report successful production of sub-radiant states of a two-atom system in a three-dimensional optical lattice starting from doubly occupied sites in a Mott insulator phase of a quantum gas of atomic ytterbium. We can selectively produce either sub-radiant 1g state or super-radiant 0u state by choosing the excitation laser frequency. The inherent weak excitation rate for the sub-radiant 1g state is overcome by the increased atomic density due to the tight-confinement in a three-dimensional...
Source: http://arxiv.org/abs/1203.2989v1
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by Samuel E. Gralla
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The second-order gravitational self-force on a small body is an important problem for gravitational-wave astronomy of extreme mass-ratio inspirals. We give a first-principles derivation of a prescription for computing the first and second perturbed metric and motion of a small body moving through a vacuum background spacetime. The procedure involves solving for a "regular field" with a specified (sufficiently smooth) "effective source", and may be applied in any gauge that...
Source: http://arxiv.org/abs/1203.3189v2
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by Yixin Fang; Yuanjia Wang; Xin Huang
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We derive a divergence formula for a group of regularization methods with an L2 constraint. The formula is useful for regularization parameter selection, because it provides an unbiased estimate for the number of degrees of freedom. We begin with deriving the formula for smoothing splines and then extend it to other settings such as penalized splines, ridge regression, and functional linear regression.
Source: http://arxiv.org/abs/1203.3559v1
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by Steven W. Peters; Robert W. Heath Jr
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This paper presents a study on multiple-antenna interference channels, accounting for general overhead as a function of the number of users and antennas in the network. The model includes both perfect and imperfect channel state information based on channel estimation in the presence of noise. Three low complexity methods are proposed for reducing the impact of overhead in the sum network throughput by partitioning users into orthogonal groups. The first method allocates spectrum to the groups...
Source: http://arxiv.org/abs/1007.0512v2
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by Alex Clark; Robbert Fokkink; Olga Lukina
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Blanc showed in his thesis that a compact minimal foliated space with a residual subset of 2-ended leaves can contain only 1 or 2 ended leaves. In this paper we give examples of compact minimal foliated spaces where a topologically generic leaf has 1 end, there is an uncountable set of leaves with 2 ends and a leaf with 2n ends, for a given n>1. The examples we present are weak solenoids, which allows us to represent the graph of the group action on the fibre as the inverse limit of finite...
Source: http://arxiv.org/abs/1007.0746v3
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by Jean-Louis Krivine
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Using the proof-program (Curry-Howard) correspondence, we give a new method to obtain models of ZF and relative consistency results in set theory. We show the relative consistency of ZF + DC + there exists a sequence of subsets of R the cardinals of which are strictly decreasing + other similar properties of R. These results seem not to have been previously obtained by forcing.
Source: http://arxiv.org/abs/1007.0825v4
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We prove a structure theorem for topologically recurrent real skew product extensions of distal minimal compact metric flows with a compactly generated Abelian acting group (e.g. $\Z^d$-flows and $\R^d$-flows). The main result states that every such extension apart from a coboundary can be represented by a perturbation of a so-called Rokhlin skew product. We obtain as a corollary that the topological ergodic decomposition of the skew product extension into prolongations is continuous and...
Source: http://arxiv.org/abs/1005.1221v2
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by Ulrich Schneider; Lucia Hackermüller; Jens Philipp Ronzheimer; Sebastian Will; Simon Braun; Thorsten Best; Immanuel Bloch; Eugene Demler; Stephan Mandt; David Rasch; Achim Rosch
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Transport properties are among the defining characteristics of many important phases in condensed matter physics. In the presence of strong correlations they are difficult to predict even for model systems like the Hubbard model. In real materials they are in general obscured by additional complications including impurities, lattice defects or multi-band effects. Ultracold atoms in contrast offer the possibility to study transport and out-of-equilibrium phenomena in a clean and well-controlled...
Source: http://arxiv.org/abs/1005.3545v2
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by Shakhar Smorodinsky
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Let $H=(V,E)$ be a hypergraph. A {\em conflict-free} coloring of $H$ is an assignment of colors to $V$ such that in each hyperedge $e \in E$ there is at least one uniquely-colored vertex. This notion is an extension of the classical graph coloring. Such colorings arise in the context of frequency assignment to cellular antennae, in battery consumption aspects of sensor networks, in RFID protocols and several other fields, and has been the focus of many recent research papers. In this paper, we...
Source: http://arxiv.org/abs/1005.3616v3
For narrative account, additional data, and usage see: http://www.rkwalton.com/salticids/Habronattus_decorus.php
Topics: Habronattus decorus, jumping spider video, salticidae, arachnid, jumping spiders
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by E. D. Mun; S. Jia; S. L. Bud'ko; P. C. Canfield
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The thermoelectric power, $S(T)$, of the heavy fermions YbT$_{2}$Zn$_{20}$ ($T$ = Fe, Ru, Os, Ir, Rh, and Co) has been measured to characterize their strong electronic correlations. A large, negative, local minimum in $S(T)$ with approximately -70 $\mu$V/K is found for all compounds. From the observed local minimum, the energy scales associated with both the Kondo temperature and the crystalline electric field splitting are deduced and compared to previous specific heat measurements. At low...
Source: http://arxiv.org/abs/1007.4244v2
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by Stéphane Mischler; Clément Mouhot
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This paper is devoted to the study of propagation of chaos and mean-field limits for systems of indistinguable particles, undergoing collision processes. The prime examples we will consider are the many-particle jump processes of Kac and McKean \cite{Kac1956,McKean1967} giving rise to the Boltzmann equation. We solve the conjecture raised by Kac \cite{Kac1956}, motivating his program, on the rigorous connection between the long-time behavior of a collisional many-particle system and the one of...
Source: http://arxiv.org/abs/1107.3251v2
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We work out the impact that the recently determined time-dependent component of the Pioneer Anomaly (PA), interpreted as an additional exotic acceleration of gravitational origin with respect to the well known PA-like constant one, may have on the orbital motions of some planets of the solar system. By assuming that it points towards the Sun, it turns out that both the semi-major axis a and the eccentricity e of the orbit of a test particle experience secular variations. For Saturn and Uranus,...
Source: http://arxiv.org/abs/1107.3445v5
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by Fred Galvin; Marion Scheepers
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We introduce a natural generalization of Borel's Conjecture. For each infinite cardinal number $\kappa$, let {\sf BC}$_{\kappa}$ denote this generalization. Then ${\sf BC}_{\aleph_0}$ is equivalent to the classical Borel conjecture. Assuming the classical Borel conjecture, $\neg{\sf BC}_{\aleph_1}$ is equivalent to the existence of a Kurepa tree of height $\aleph_1$. Using the connection of ${\sf BC}_{\kappa}$ with a generalization of Kurepa's Hypothesis, we obtain the following consistency...
Source: http://arxiv.org/abs/1107.5383v2
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by Tsing-Wai Wong; Francesca Valsecchi; Tassos Fragos; Vassiliki Kalogera
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In recent years, accurate observational constraints become available for an increasing number of Galactic X-ray binaries. Together with proper motion measurements, we could reconstruct the full evolutionary history of X-ray binaries back to the time of compact object formation. In this paper, we present the first study of the persistent X-ray source Cygnus\;X-1 that takes into account of all available observational constraints. Our analysis accounts for three evolutionary phases: orbital...
Source: http://arxiv.org/abs/1107.5585v2
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by Tessa Baker; Pedro G. Ferreira; Constantinos Skordis; Joe Zuntz
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There is a distinct possibility that current and future cosmological data can be used to constrain Einstein's theory of gravity on the very largest scales. To be able to do this in a model-independent way, it makes sense to work with a general parameterization of modified gravity. Such an approach would be analogous to the Parameterized Post-Newtonian (PPN) approach which is used on the scale of the Solar System. A few such parameterizations have been proposed and preliminary constraints have...
Source: http://arxiv.org/abs/1107.0491v2
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by Jean Fasel; Richard G. Swan; Ravi A. Rao
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We prove that stably free modules of rank d-1 over a smooth affine algebra of dimension d over an algebraically closed field k are free, provided (d-1)! is nonzero in k.
Source: http://arxiv.org/abs/1107.1051v2
We develop a new connection between Differential Algebra and Geometric Invariant Theory, based on an anti-equivalence of categories between solution algebras associated to a linear differential equation (i.e. differential algebras generated by finitely many polynomials in a fundamental set of solutions), and affine quasi-homogeneous varieties (over the constant field) for the differential Galois group of the equation. Solution algebras can be associated to any connection over a smooth affine...
Source: http://arxiv.org/abs/1107.1179v2
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by Michael Backes; Ian Goldberg; Aniket Kate; Tomas Toft
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Interest in anonymous communication over distributed hash tables (DHTs) has increased in recent years. However, almost all known solutions solely aim at achieving sender or requestor anonymity in DHT queries. In many application scenarios, it is crucial that the queried key remains secret from intermediate peers that (help to) route the queries towards their destinations. In this paper, we satisfy this requirement by presenting an approach for providing privacy for the keys in DHT queries. We...
Source: http://arxiv.org/abs/1107.1072v2
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by Chun-Yu Cui; Yong-Lu Liu; Ming-Qiu Huang
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The recently observed narrow resonance $Z_{b}(10610)$ is examined with the assumptions both as a $B^{*}\bar{B}$ molecular state and a $[bd][\bar{b}\bar{u}]$ tetraquark state with quantum numbers $I^{G}J^{P}=1^{+}1^{+}$. Possible interpolating currents are constructed to describe the $Z_{b}(10650)$ as an axial-vector $B^{*}\bar{B}^{*}$ molecular state or a $[bd][\bar{b}\bar{u}]$ tetraquark state. Using QCD sum rules (QCDSR), we consider contributions up to dimension six in the operator product...
Source: http://arxiv.org/abs/1107.1343v3
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by M. Reza Shaebani; Mahyar Madadi; Stefan Luding; Dietrich E. Wolf
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We study the effect of polydispersity on the macroscopic physical properties of granular packings in two and three dimensions. A mean-field approach is developed to approximate the macroscale quantities as functions of the microscopic ones. We show that the trace of the fabric and stress tensors are proportional to the mean packing properties (e.g. packing fraction, average coordination number, and average normal force) and dimensionless correction factors, which depend only on the moments of...
Source: http://arxiv.org/abs/1107.2069v2
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In this paper we analyse the Gevrey well-posedness of the Cauchy problem for weakly hyperbolic equations of general form with time-dependent coefficients. The results involve the order of lower order terms and the number of multiple roots. We also derive the corresponding well-posedness results in the space of Gevrey Beurling ultradistributions.
Source: http://arxiv.org/abs/1107.2565v2
Arxiv.org
by A. Musiał; P. Kaczmarkiewicz; G. Sęk; P. Podemski; P. Machnikowski; J. Misiewicz; S. Hein; S. Höfling; A. Forchel
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We study experimentally and theoretically polarization-dependent luminescence from an ensemble of quantum-dot-like nanostructures with a very large in-plane shape anisotropy (quantum dashes). We show that the measured degree of linear polarization of the emitted light increases with the excitation power and changes with temperature in a non-trivial way, depending on the excitation conditions. Using an approximate model based on the k.p theory, we are able to relate this degree of polarization...
Source: http://arxiv.org/abs/1107.4332v2
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by Prof. John Erdman
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The current set of notes is an activity-oriented companion to the study of real analysis. It is intended as a pedagogical companion for the beginner, an introduction to some of the main ideas in real analysis, a compendium of problems I think are useful in learning the subject, and an annotated reading/reference list
Topics: Maths, Mathematics
Source: http://www.flooved.com/reader/3485