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Arxiv.org
by Franco Buccella; Domenico Falcone; Chee Sheng Fong; Enrico Nardi; Giulia Ricciardi
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We consider the see-saw mechanism within a non-supersymmetric SO(10) model. By assuming the SO(10) quark-lepton symmetry, and after imposing suitable conditions that ensure that the right-handed (RH) neutrino masses are at most mildly hierarchical (compact RH spectrum) we obtain a surprisingly predictive scenario. The absolute neutrino mass scale, the Dirac and the two Majorana phases of the neutrino mixing matrix remain determined in terms of the set of already measured low energy observables,...
Source: http://arxiv.org/abs/1203.0829v2
Deb Cotton Secondline Collection
by BigRedCotton
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Source: https://www.youtube.com/watch?v=JDxNu8RO7v4 Uploader: BigRedCotton Upload date: 20120924
Topics: Youtube, video, Entertainment, clip, 2012, 09, 23, 12, 27, 59, debcotton,...
Arxiv.org
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Random coding, along with various standard techniques such as coded time-sharing, rate-splitting, superposition coding, and binning, are traditionally used in obtaining achievable rate regions for multi-terminal networks. The error analysis of such an achievable scheme relies heavily on the properties of strongly joint typical sequences and on bounds of the cardinality of typical sets. In this work, we obtain an achievable rate region for a general (i.e. an arbitrary set of messages shared...
Source: http://arxiv.org/abs/1107.4705v2
Arxiv.org
by B. Parise; F. Du; F. -C. Liu; A. Belloche; H. Wiesemeyer; R. Güsten; K. M. Menten; H. W. Hübers; B. Klein
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Although water is an essential and widespread molecule in star-forming regions, its chemical formation pathways are still not very well constrained. Observing the level of deuterium fractionation of OH, a radical involved in the water chemical network, is a promising way to infer its chemical origin. We aim at understanding the formation mechanisms of water by investigating the origin of its deuterium fractionation. This can be achieved by observing the abundance of OD towards the low-mass...
Source: http://arxiv.org/abs/1203.2825v1
A corrector theory for the strong approximation of gradient fields inside periodic composites made from two materials with different power law behavior is provided. Each material component has a distinctly different exponent appearing in the constitutive law relating gradient to flux. The correctors are used to develop bounds on the local singularity strength for gradient fields inside micro-structured media. The bounds are multi-scale in nature and can be used to measure the amplification of...
Source: http://arxiv.org/abs/1107.3181v2
Arxiv.org
by César Ayala; Carlos Contreras; Gorazd Cvetič
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In contrast to perturbative QCD, the analytic QCD models have running coupling whose analytic properties correctly mirror those of spacelike observables. The discontinuity (spectral) function of such running coupling is expected to agree with the perturbative case at large timelike momenta; however, at low timelike momenta it is not known. In the latter regime, we parametrize the unknown behavior of the spectral function as a sum of (two) delta functions; while the onset of the perturbative...
Source: http://arxiv.org/abs/1203.6897v2
Arxiv.org
by E. R. Bezerra de Mello; A. A. Saharian
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We investigate the Wightman function, the vacuum expectation values of the field squared and the energy-momentum tensor for a massive scalar field with general curvature coupling in the generalized cosmic string geometry with a compact dimension along its axis. The boundary condition along the compactified dimension is taken in general form with an arbitrary phase. The vacuum expectation values are decomposed into two parts. The first one corresponds to the uncompactified cosmic string geometry...
Source: http://arxiv.org/abs/1107.2557v2
Arxiv.org
by Casper Drukier; Lorenz Bartosch; Aldo Isidori; Peter Kopietz
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Using functional renormalization group methods, we study an effective low-energy model describing the Ising-nematic quantum critical point in two-dimensional metals. We treat both gapless fermionic and bosonic degrees of freedom on equal footing and explicitly calculate the momentum and frequency dependent effective interaction between the fermions mediated by the bosonic fluctuations. Following earlier work by S.-S. Lee for a one-patch model, Metlitski and Sachdev [Phys. Rev. B {\bf{82}},...
Source: http://arxiv.org/abs/1203.2645v2
Arxiv.org
by Lei Li; Sihai Zhang; Kaiwei Wang; Wuyang Zhou
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In cognitive radio networks, channel aggregation (CA) and channel fragmentation (CF) techniques have been proposed to enhance the spectrum utilization. While most of the literature studies CA and CF independently, in this paper we combine CA and CF innovatively and present a new spectrum sharing strategy named CAF (Channel Aggregation and Fragmentation). We elaborate on the proposed CAF strategy and derive the balance equation by a continuous time Markov chain (CTMC) model. Then various system...
Source: http://arxiv.org/abs/1203.4913v2
Arxiv.org
by Chung-Hsing Chen; Wen-Chi Su; Chih-Yu Chen; Jing-Ying Huang; Fang-Yu Tsai; Wen-Chang Wang; Chao A. Hsiung; King-Song Jeng; I-Shou Chang
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RNA interference (RNAi) is an endogenous cellular process in which small double-stranded RNAs lead to the destruction of mRNAs with complementary nucleoside sequence. With the production of RNAi libraries, large-scale RNAi screening in human cells can be conducted to identify unknown genes involved in a biological pathway. One challenge researchers face is how to deal with the multiple testing issue and the related false positive rate (FDR) and false negative rate (FNR). This paper proposes a...
Source: http://arxiv.org/abs/1203.4445v1
Arxiv.org
by Alexandre Lung-Yut-Fong; Céline Lévy-Leduc; Olivier Cappé
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Detecting and locating changes in highly multivariate data is a major concern in several current statistical applications. In this context, the first contribution of the paper is a novel non-parametric two-sample homogeneity test for multivariate data based on the well-known Wilcoxon rank statistic. The proposed two-sample homogeneity test statistic can be extended to deal with ordinal or censored data as well as to test for the homogeneity of more than two samples. The second contribution of...
Source: http://arxiv.org/abs/1107.1971v3
Arxiv.org
by M. F. Cornelio; O. Jiménez Farías; F. F. Fanchini; I. Frerot; G. H. Aguilar; M. O. Hor-Meyll; M. C. de Oliveira; S. P. Walborn; A. O. Caldeira; P. H. Souto Ribeiro
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We use the classical correlation between a quantum system being measured and its measurement apparatus to analyze the amount of information being retrieved in a quantum measurement process. Accounting for decoherence of the apparatus, we show that these correlations may have a sudden transition from a decay regime to a constant level. This transition characterizes a non-asymptotic emergence of the pointer basis, while the system-apparatus can still be quantum correlated. We provide a...
Source: http://arxiv.org/abs/1203.5068v2
Arxiv.org
by Rory Smith; Richard R. Lane; Blair C. Conn; Michael Fellhauer
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We model the formation of Auriga's Wheel - a recently discovered collisional ring galaxy. Auriga's Wheel has a number of interesting features including a bridge of stars linking the neighbouring elliptical to the ring galaxy, and evidence for components of expansion and rotation within the ring. Using N-body/SPH modelling, we study collisions between an elliptical galaxy and a late-type disk galaxy. A near direct collision, with a mildy inclined disk, is found to reasonably reproduce the...
Source: http://arxiv.org/abs/1203.2610v1
Arxiv.org
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We show that for every mixing orthogonal representation $\pi : \Z \to \mathcal O(H_\R)$, the abelian subalgebra $\LL(\Z)$ is maximal amenable in the crossed product ${\rm II}_1$ factor $\Gamma(H_\R)\dpr \rtimes_\pi \Z$ associated with the free Bogoljubov action of the representation $\pi$. This provides uncountably many non-isomorphic $A$-$A$-bimodules which are disjoint from the coarse $A$-$A$-bimodule and of the form $\LL^2(M \ominus A)$ where $A \subset M$ is a maximal amenable masa in a...
Source: http://arxiv.org/abs/1203.6743v1
Arxiv.org
by J. Takata; A. T. Okazaki; S. Nagataki; T. Naito; A. Kawachi; S. -H. Lee; M. Mori; K. Hayasaki; M. S. Yamaguchi; S. P. Owocki
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Temporal changes of X-ray to very-high-energy gamma-ray emissions from the pulsar-Be star binary PSR B1259-63/LS 2883 are studied based on 3-D SPH simulations of pulsar wind interaction with Be-disk and wind. We focus on the periastron passage of the binary and calculate the variation of the synchrotron and inverse-Compton emissions using the simulated shock geometry and pressure distribution of the pulsar wind. The characteristic double-peaked X-ray light curve from observations is reproduced...
Source: http://arxiv.org/abs/1203.2179v2
Arxiv.org
by Aldo V. Figallo; Carlos Gallardo; Gustavo Pelaitay
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Here we initiate an investigation of the equational classes of m-symmetric algebras endowed with two tense operators. These varieties is a generalization of tense algebras. Our main interest is the duality theory for these classes of algebras. In order to do this, we require Urquart's duality for Ockham algebras and Goldblatt's duality for bounded distributive lattice with operations. The dualities enable us to describe the lattices of congruences on tense m-symmetric algebras.
Source: http://arxiv.org/abs/1203.5374v1
For narrative account, additional data, and usage see: http://www.rkwalton.com/salticids/Sassacus_cyaneus.php
Topics: Sassacus cyaneus, jumping spider video, salticidae, arachnid, jumping spiders
Arxiv.org
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The maximally extended Reissner--Nordstr\"om (RN) manifold with $e^2 < m^2$ begs for attaching a material source to it that would preserve the infinite chain of asymptotically flat regions and evolve through the wormhole between the RN singularities. So far, the attempts were discouraging. Here we try one more possible source -- a solution found by Ruban in 1972 that is a charged generalisation of an inhomogeneous Kantowski--Sachs-type dust solution. It can be matched to the RN...
Source: http://arxiv.org/abs/1107.4897v3
Arxiv.org
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We have investigated the six most tightly bound states of each of the atoms, helium and lithium, in intense magnetic fields. In this regard, we report new data for two new states of lithium that have not been studied thus far in the literature. The energy levels of these first few low-lying states are calculated in this study employing a pseudospectral method as the computational tool. The methodology involves computing the eigenvalues and eigenvectors of the generalized two-dimensional...
Source: http://arxiv.org/abs/1203.3437v1
Arxiv.org
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The autocorrelation function of the Langevin force in the model introduced in the cited paper is calculated and verified to be correct.
Source: http://arxiv.org/abs/1203.4512v1
Arxiv.org
by Curtis Menton
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We study the behavior of Range Voting and Normalized Range Voting with respect to electoral control. Electoral control encompasses attempts from an election chair to alter the structure of an election in order to change the outcome. We show that a voting system resists a case of control by proving that performing that case of control is computationally infeasible. Range Voting is a natural extension of approval voting, and Normalized Range Voting is a simple variant which alters each vote to...
Source: http://arxiv.org/abs/1005.5698v3
Arxiv.org
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Quantum chromodynamics (QCD) reduces the strong interactions, in all their variety, to a simple nonabelian gauge theory. It clearly and elegantly explains hadrons at short distances, which has led to its universal acceptance. Since its advent, however, many of its long-distance, emergent properties have been believed to be true, without having been demonstrated to be true. This paper reviews a variety of results in this regime that have been established with lattice gauge theory, directly from...
Source: http://arxiv.org/abs/1203.1204v2
Arxiv.org
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Differential rotation induced by the r-mode instability can generate very strong toroidal fields in the core of accreting, millisecond spinning neutron stars. We introduce explicitly the magnetic damping term in the evolution equations of the r-modes and solve them numerically in the Newtonian limit, to follow the development and growth of the internal magnetic field. We show that the strength of the latter can reach large values, $B \sim 10^{14} $ G, in the core of the fastest accreting...
Source: http://arxiv.org/abs/1203.0891v2
Arxiv.org
by Maxim Perelstein; Bibhushan Shakya
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We study theoretical implications of direct dark matter searches in the minimal supersymmetric standard model (MSSM). We assume that no accidental cancellations occur in the spin-independent elastic neutralino-quark scattering cross section, but do not impose any relations among the weak-scale MSSM parameters. We show that direct detection cross section below 10^-44 cm^2 requires the lightest supersymmetric particle (LSP) neutralino to be close to either a pure gaugino or pure Higgsino limit,...
Source: http://arxiv.org/abs/1107.5048v4
Arxiv.org
by Jay Gopalakrishnan; Weifeng Qiu
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In this work we give a complete error analysis of the Discontinuous Petrov Galerkin (DPG) method, accounting for all the approximations made in its practical implementation. Specifically, we consider the DPG method that uses a trial space consisting of polynomials of degree $p$ on each mesh element. Earlier works showed that there is a "trial-to-test" operator $T$, which when applied to the trial space, defines a test space that guarantees stability. In DPG formulations, this operator...
Source: http://arxiv.org/abs/1107.4293v2
Arxiv.org
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We are considering iterative derivations on the function field L of abelian schemes in positive characteristic p>0, and give conditions when the torsion group schemes of this abelian scheme occur as ID-automorphism groups, i.e. are the ID-Galois groups of L over certain ID-subfields. For an explicit example, we even give a construction of (a family of) such iterative derivations.
Source: http://arxiv.org/abs/1203.6198v1
Deb Cotton Secondline Collection
by BigRedCotton
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Source: https://www.youtube.com/watch?v=gh89doPsbdY Uploader: BigRedCotton Upload date: 20120923
Topics: Youtube, video, Entertainment, clip, 2012, 09, 23, 12, 27, 58, debcotton,...
Deb Cotton Secondline Collection
by BigRedCotton
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Source: https://www.youtube.com/watch?v=MOvtC0I_pQ8 Uploader: BigRedCotton Upload date: 20120411
Topics: Youtube, video, Music, clip, 2012, 01, 22, 11, 27, 06, debcotton, debcottonsecondlinecollection,...
Arxiv.org
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A new zerofree region of the Riemann Zeta-function $\zeta$ is identified by using Tur\'an's localization criterion linking zeros of $\zeta$ with uniform local suprema of sets of Dirichlet polynomials expanded over the primes. The proof is based on a randomization argument. An estimate for local extrema for some finite families of shifted Dirichlet polynomials, % associated to linearly independent sequences of reals is established by preliminary considering their local increment properties, by...
Source: http://arxiv.org/abs/1005.3932v2
Arxiv.org
by W. D. Rice; J. Kono; S. Zybell; S. Winnerl; J. Bhattacharyya; H. Schneider; M. Helm; B. Ewers; A. Chernikov; M. Koch; S. Chatterjee; G. Khitrova; H. M. Gibbs; L. Schneebeli; B. Breddermann; M. Kira; S. W. Koch
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We use terahertz pulses to induce resonant transitions between the eigenstates of optically generated exciton populations in a high-quality semiconductor quantum-well sample. Monitoring the excitonic photoluminescence, we observe transient quenching of the $1s$ exciton emission, which we attribute to the terahertz-induced $1s$-to-$2p$ excitation. Simultaneously, a pronounced enhancement of the $2s$-exciton emission is observed, despite the $1s$-to-$2s$ transition being dipole forbidden. A...
Source: http://arxiv.org/abs/1203.3994v2
Deb Cotton Secondline Collection
by BigRedCotton
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Source: https://www.youtube.com/watch?v=pzHNpyGJpyA Uploader: BigRedCotton Upload date: 20120411
Topics: Youtube, video, Music, clip, 2012, 01, 22, 11, 27, 05, debcotton, debcottonsecondlinecollection,...
Arxiv.org
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A major, albeit serendipitous, discovery of the SOlar and Heliospheric Observatory mission was the observation by the Extreme Ultraviolet Telescope (EIT) of large-scale Extreme Ultraviolet (EUV) intensity fronts propagating over a significant fraction of the Sun's surface. These so-called EIT or EUV waves are associated with eruptive phenomena and have been studied intensely. However, their wave nature has been challenged by non-wave (or pseudo-wave) interpretations and the subject remains...
Source: http://arxiv.org/abs/1203.1135v1
Arxiv.org
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Taking advantage of the known analytic expression of the eigenfunctions and eigenenergies of the Morse Hamiltonian, explicit expressions are found for the scattering length $a$ and the effective range $r_e$ which determine the s-wave scattering of ultracold atoms. The effects on $a$ and $r_e$ of considering the radial coordinate in the interval $[0,\infty)$ or in the extended region $(-\infty, \infty)$ are studied in detail.
Source: http://arxiv.org/abs/1203.1285v1
Arxiv.org
by Matthew R. Buckley; Michael J. Ramsey-Musolf
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Extensions of the Standard Model that contain leptophobic Z' gauge bosons are theoretically interesting but difficult to probe directly in high-energy hadron colliders. However, precision measurements of Standard Model neutral current processes can provide powerful indirect tests. We demonstrate that parity-violating deep inelastic scattering of polarized electrons off of deuterium offer a unique probe leptophobic Z' bosons with axial quark couplings and masses above 100 GeV. In addition to...
Source: http://arxiv.org/abs/1203.1102v1
Arxiv.org
by Sudhakar Yarlagadda; Peter B. Littlewood; Pinaki Majumdar; Ravindra Pankaj
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We demonstrate that manganite heterostructures of the form $(Insulator)/(LaMnO_3)_n/(SrMnO_3)_n/(Insulator)$ show strong multiferroicity with magnetic ordering being induced by ferroelectric charge ordering. Ferroelectric polarization is produced by charges leaking from $LaMnO_3$ side to the $SrMnO_3$ side on account of the effective nearest-neighbor repulsion of electrons resulting from electron-phonon interaction. The origin of the ferromagnetism is due to double exchange when a particle...
Source: http://arxiv.org/abs/1203.3283v1
Source: https://www.youtube.com/watch?v=XtdGZHzz-mg Uploader: BigRedCotton Upload date: 20120929
Topics: Youtube, video, Music, Tornado Brass Band, Second line, brass band, parade, New Orleans, jazz,...
Arxiv.org
by Eliyahu Osherovich; Michael Zibulevsky; Irad Yavneh
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In this work we develop an algorithm for signal reconstruction from the magnitude of its Fourier transform in a situation where some (non-zero) parts of the sought signal are known. Although our method does not assume that the known part comprises the boundary of the sought signal, this is often the case in microscopy: a specimen is placed inside a known mask, which can be thought of as a known light source that surrounds the unknown signal. Therefore, in the past, several algorithms were...
Source: http://arxiv.org/abs/1203.0879v1
Arxiv.org
by Balázs Dóra; Ádám Bácsi; Gergely Zaránd
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We analyze the probability distribution function (PDF) of work done on a Luttinger liquid for an arbitrary finite duration interaction quench and show that it can be described in terms a generalized Gibbs ensemble. We construct the corresponding density matrix with explicit intermode correlations, and determine the duration and interaction dependence of the probability of an adiabatic transition and the PDF of non-adiabatic processes. In the thermodynamic limit, the PDF of work exhibits a...
Source: http://arxiv.org/abs/1203.0914v2
Arxiv.org
by F. Yusef-Zadeh; M. Wardle; K. Dodds-Eden; C. O. Heinke; S. Gillessen; R. Genzel; H. Bushouse; N. Grosso; D. Porquet
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The X-ray and near-IR emission from Sgr A* is dominated by flaring, while a quiescent component dominates the emission at radio and sub-mm wavelengths. The spectral energy distribution of the quiescent emission from Sgr A* peaks at sub-mm wavelengths and is modeled as synchrotron radiation from a thermal population of electrons in the accretion flow, with electron temperatures ranging up to $\sim 5-20$\,MeV. Here we investigate the mechanism by which X-ray flare emission is produced through the...
Source: http://arxiv.org/abs/1203.2188v1
Arxiv.org
by Christian Salas
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Cantor primes are primes p such that 1/p belongs to the middle-third Cantor set. One way to look at them is as containing the base-3 analogues of the famous Mersenne primes, which encompass all base-2 repunit primes, i.e., primes consisting of a contiguous sequence of 1's in base 2 and satisfying an equation of the form p + 1 = 2^q. The Cantor primes encompass all base-3 repunit primes satisfying an equation of the form 2p + 1 = 3^q, and I show that in general all Cantor primes > 3 satisfy a...
Source: http://arxiv.org/abs/1203.3969v2
Arxiv.org
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The Chalonge 15th Paris Cosmology Colloquium 2011 was held on 20-22 July in the historic Paris Observatory's Perrault building, in the Chalonge School spirit combining real cosmological/astrophysical data and hard theory predictive approach connected to them in the Warm Dark Matter Standard Model of the Universe: News and reviews from Herschel, QUIET, Atacama Cosmology Telescope (ACT), South Pole Telescole (SPT), Planck, PIXIE, the JWST, UFFO, KATRIN and MARE experiments; astrophysics, particle...
Source: http://arxiv.org/abs/1203.3562v1
Arxiv.org
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The crosscap number of a knot is an invariant describing the non-orientable surface of smallest genus that the knot bounds. Unlike knot genus (its orientable counterpart), crosscap numbers are difficult to compute and no general algorithm is known. We present three methods for computing crosscap number that offer varying trade-offs between precision and speed: (i) an algorithm based on Hilbert basis enumeration and (ii) an algorithm based on exact integer programming, both of which either...
Source: http://arxiv.org/abs/1107.2382v2
Arxiv.org
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We prove the differential family index theorem by the flat family index theorem and the differential Grothendieck-Riemann-Roch theorem.
Source: http://arxiv.org/abs/1203.5383v3
Arxiv.org
by K. Fialkowski; R. Wit
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The STAR data on the multiplicity correlations between narrow psudorapidity bins in the pp and AuAu collisions are discussed. The PYTHIA 8.145 generator is used for the pp data, and a naive superposition model is presented for the AuAu data. It is shown that the PYTHIA generator with default parameter values describes the pp data reasonably well, whereas the superposition model fails to reproduce the centrality dependence seen in the data. Some possible reasons for this failure and a comparison...
Source: http://arxiv.org/abs/1203.3671v2
Arxiv.org
by Charles Fefferman; C. Robin Graham
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Direct proofs are given of Juhl's formulae for GJMS operators and Q-curvatures starting from the original construction of GJMS.
Source: http://arxiv.org/abs/1203.0360v1
Arxiv.org
by S. Bradley Cenko; Hans A. Krimm; Assaf Horesh; Arne Rau; Dale A. Frail; Jaime A. Kennea; Andrew J. Levan; Stephen T. Holland; Nat R. Butler; Robert M. Quimby; Joshua S. Bloom; Alexei V. Filippenko; Avishay Gal-Yam; Jochen Greiner; S. R. Kulkarni; Eran O. Ofek; Felipe Olivares E.; Patricia Schady; Jeffrey M. Silverman; Nial Tanvir; Dong Xu
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We report the discovery by the Swift hard X-ray monitor of the transient source Swift J2058.4+0516 (Sw J2058+05). Our multi-wavelength follow-up campaign uncovered a long-lived (duration >~ months), luminous X-ray (L_X,iso ~ 3 x 10^47 erg s^-1) and radio (nu L_nu,iso ~ 10^42 erg s^-1) counterpart. The associated optical emission, however, from which we measure a redshift of 1.1853, is relatively faint, and this is not due to a large amount of dust extinction in the host galaxy. Based on...
Source: http://arxiv.org/abs/1107.5307v3
Arxiv.org
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Numerical integration of ODEs by standard numerical methods reduces a continuous time problems to discrete time problems. Discrete time problems have intrinsic properties that are absent in continuous time problems. As a result, numerical solution of an ODE may demonstrate dynamical phenomena that are absent in the original ODE. We show that numerical integration of system with one fast rotating phase lead to a situation of such kind: numerical solution demonstrate phenomenon of scattering on...
Source: http://arxiv.org/abs/1203.4113v1
Arxiv.org
by X. Wang; S. Briguglio; L. Chen; G. Fogaccia; C. Di Troia; G. Vlad; F. Zonca
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Nonlinear saturation of beta induced Alfv\'en eigenmode, driven by slowing down energetic particles via transit resonance, is investigated by the nonlinear hybrid magnetohyrodynamic gyro-kinetic code (XHMGC). Saturation is characterized by frequency chirping and symmetry breaking between co- and counter-passing particles, which can be understood as the the evidence of resonance-detuning. The scaling of the saturation amplitude with the growth rate is also demonstrated to be consistent with...
Source: http://arxiv.org/abs/1203.3769v1
Arxiv.org
by Stefano Olivares; Matteo G. A. Paris
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Supplement 1 to GUM (GUM-S1) recommends the use of maximum entropy principle (MaxEnt) in determining the probability distribution of a quantity having specified properties, e.g., specified central moments. When we only know the mean value and the variance of a variable, GUM-S1 prescribes a Gaussian probability distribution for that variable. When further information is available, in the form of a finite interval in which the variable is known to lie, we indicate how the distribution for the...
Source: http://arxiv.org/abs/1203.2934v1
Arxiv.org
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Scale-invariant fluctuations of growing interfaces are studied for circular clusters of an off-lattice variant of the Eden model, which belongs to the (1+1)-dimensional Kardar-Parisi-Zhang (KPZ) universality class. Statistical properties of the height (radius) fluctuations are numerically determined and compared with the recent theoretical developments as well as the author's experimental result on growing interfaces in turbulent liquid crystal [K. A. Takeuchi and M. Sano, arXiv:1203.2530]. We...
Source: http://arxiv.org/abs/1203.2483v3
Arxiv.org
by Kazunori Noguchi
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We define the zeta function of a finite category. And we propose a conjecture which states the relationship between the Euler characteristic of finite categories and the zeta function of finite categories. This conjecture is verified when categories are finite groupoids, finite acyclic categories, categories with 2-objects and finite categories satisfying certain condition.
Source: http://arxiv.org/abs/1203.6133v3
Arxiv.org
by Xinyi Zhang; Bo-Qiang Ma
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The latest experimental progress have established three kinds of neutrino oscillations with three mixing angles measured to rather high precision. There is still one parameter, i.e., the CP violating phase, missing in the neutrino mixing matrix. It is shown that a replay between different parametrizations of the mixing matrix can determine the full neutrino mixing matrix together with the CP violating phase. From the maximal CP violation observed in the original Kobayashi-Maskawa (KM) scheme of...
Source: http://arxiv.org/abs/1203.2906v4
Arxiv.org
by K. Sriram; A. R. Rao; C. S. Choi
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The evolution of different types of quasi-periodic oscillations (QPOs) and the coupled radiative/physical changes in the accretion disk are still poorly understood. In a few black hole binaries it was found that fast evolution of QPOs is associated with spectral variations. Such studies in other black hole binaries are important to understand the QPO phenomenon. For the black hole transient XTE J1817-330, we study fast QPO transitions and accompanying spectral variations to investigate what...
Source: http://arxiv.org/abs/1203.1674v1
Arxiv.org
by J. Cleymans
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A discussion is presented of results with identified particles at the Large Hadron Collider. Possible deviations from the standard statistical distributions are investigated by considering in detail results obtained using the Tsallis distribution. Matter-antimatter production is discussed within the framework of chemical equilibrium in \pp and heavy ion collisions.
Source: http://arxiv.org/abs/1203.5640v1
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by Sinya Aoki; Koji Hashimoto; Norihiro Iizuka
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We provide, for non-experts, a brief overview of holographic QCD and a review of a recent proposal of matrix-description of multi-baryon systems in holographic QCD. Based on the matrix model, we derive the baryon interaction at short distances in multi-flavor holographic QCD. We show that there is a very universal repulsive core of inter-baryon forces for generic number of flavors. This is consistent with a recent lattice QCD analysis for N_f = 2, 3 where repulsive core looks universal. We also...
Source: http://arxiv.org/abs/1203.5386v1
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We derive the asymptotic distribution of the total length $L_n$ of a $\operatorname {Beta}(2-\alpha,\alpha)$-coalescent tree for $1
Source: http://arxiv.org/abs/1107.2855v3
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by Risheng Liu; Zhouchen Lin; Fernando De la Torre; Zhixun Su
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Subspace clustering and feature extraction are two of the most commonly used unsupervised learning techniques in computer vision and pattern recognition. State-of-the-art techniques for subspace clustering make use of recent advances in sparsity and rank minimization. However, existing techniques are computationally expensive and may result in degenerate solutions that degrade clustering performance in the case of insufficient data sampling. To partially solve these problems, and inspired by...
Source: http://arxiv.org/abs/1203.2210v2
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by Devin L. Underwood; Will E. Shanks; Jens Koch; Andrew A. Houck
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We assess experimentally the suitability of coupled transmission line resonators for studies of quantum phase transitions of light. We have measured devices with low photon hopping rates t/2pi = 0.8MHz to quantify disorder in individual cavity frequencies. The observed disorder is consistent with small imperfections in fabrication. We studied the dependence of the disorder on transmission line geometry and used our results to fabricate devices with disorder less than two parts in 10^4. The...
Source: http://arxiv.org/abs/1203.5363v2
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by Bishop Mongwane; Peter K. S. Dunsby; Bob Osano
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We use non-linear gauge-invariant perturbation theory to study the interaction of an inflation produced seed magnetic field with density and gravitational wave perturbations in an almost Friedmann-Lema\^itre-Robertson-Walker (FLRW) spacetime. We compare the effects of this coupling under the assumptions of poor conductivity, infinite conductivity and the case where the electric field is sourced via the coupling of velocity perturbations to the seed field in the ideal magnetohydrodynamic (MHD)...
Source: http://arxiv.org/abs/1203.6032v2
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by Boris Bukh; Gabriel Nivasch
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In 2008, Bukh, Matousek, and Nivasch conjectured that for every n-point set S in R^d and every k, 0
Source: http://arxiv.org/abs/1107.3421v3
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by P. J. E. Peebles
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The network of cosmological tests is tight enough now to show that the relativistic Big Bang cosmology is a good approximation to what happened as the universe expanded and cooled through light element production and evolved to the present. I explain why I reach this conclusion, comment on the varieties of philosophies informing searches for a still better cosmology, and offer an example for further study, the curious tendency of some classes of galaxies to behave as island universes.
Source: http://arxiv.org/abs/1203.6334v1
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by N. Sandulescu; D. Negrea; J. Dukelsky; C. W. Johnson
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We propose a simple quartet condensation model (QCM) which describes with very high accuracy the isovector pairing correlations in self-conjugate nuclei. The quartets have an alpha-like structure and are formed by collective isovector pairs. The accuracy of the QCM is tested for N=Z nuclei for which exact shell model diagonalizations can be performed. The calculations are done with two isovector pairing forces, one extracted from standard shell model interactions and the other of seniority...
Source: http://arxiv.org/abs/1203.0779v1
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For any Ritt operator $T$ acting on a noncommutative $L^p$-space, we define the notion of \textit{completely} bounded functional calculus $H^\infty(B_\gamma)$ where $B_\gamma$ is a Stolz domain. Moreover, we introduce the `column square functions' $\norm{x}_{T,c,\alpha}=\Bnorm{\Big(\sum_{k=1}^{+\infty}k^{2\alpha-1}|T^{k-1}(I-T)^{\alpha}(x)|^2\Big)^{1/2}}_{L^p(M)}$ and the `row square functions' $\norm{x}_{T,r,\alpha}=\Bnorm{\Big(\sum_{k=1}^{+\infty}k^{2\alpha-1}...
Source: http://arxiv.org/abs/1107.3415v5
For narrative account, additional data, and usage see: http://www.rkwalton.com/salticids/Sitticus_pubescens.php
Topics: Sitticus pubescens, jumping spider video, salticidae, arachnid, jumping spiders
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In this paper, we consider two systems modelling the evolution of a rigid body in an incompressible fluid in a bounded domain of the plane. The first system corresponds to an inviscid fluid driven by the Euler equation whereas the other one corresponds to a viscous fluid driven by the Navier-Stokes system. In both cases we investigate the uniqueness of weak solutions, "\`a la Yudovich" for the Euler case, "\`a la Leray" for the Navier-Stokes case, as long as no collision...
Source: http://arxiv.org/abs/1203.2894v1
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by Gabriel Lopez Castro; Nestor Quintero
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We study the four-body tau^+- -> nu_tau l^+- l^+- X^-+ decays where l=e or mu and X=pi, K, rho and K^* mesons. These decay processes violate the total lepton number (|Delta L|=2) and can be induced by the exchange of Majorana neutrinos. We consider an scenario where these decays are dominated by the exchange of only one heavy neutrino which produces an enhancement of the decay amplitude via the resonant mechanism. Searches for these novel decay channels with branching fractions sensitivities...
Source: http://arxiv.org/abs/1203.0537v2
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The three traditional failure classes are system, media, and transaction failures. Sometimes, however, modern storage exhibits failures that differ from all of those. In order to capture and describe such cases, single-page failures are introduced as a fourth failure class. This class encompasses all failures to read a data page correctly and with plausible contents despite all correction attempts in lower system levels. Efficient recovery seems to require a new data structure called the page...
Source: http://arxiv.org/abs/1203.6404v1
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by Edoardo Ballico; Claudio Fontanari
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We discuss two conjectures by Francesco Severi and Joe Harris about the irreducibility and the dimension of the Hilbert scheme parameterizing smooth projective curves of given degree and genus.
Source: http://arxiv.org/abs/1203.5946v1
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We define Weierstrass filtration for Teichm\"{u}ller curves. We construct the Harder-Narasimhan filtration of the Hodge bundle of a Teichm\"{u}ller curve in hyperelliptic loci and low genus non-varying strata, and regain the sum of Lyapunov exponents of Teichm\"{u}ller curves in these strata.
Source: http://arxiv.org/abs/1203.6053v5
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Suppose that $X$ is a projective variety over an algebraically closed field of characteristic $p > 0$. Further suppose that $L$ is an ample (or more generally in some sense positive) divisor. We study a natural linear system in $|K_X + L|$. We further generalize this to incorporate a boundary divisor $\Delta$. We show that these subsystems behave like the global sections associated to multiplier ideals, $H^0(X, \mJ(X, \Delta) \tensor L)$ in characteristic zero. In particular, we show that...
Source: http://arxiv.org/abs/1107.3833v4
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by Jeroen P. A. Devreese; Michiel Wouters; Jacques Tempere
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The question whether a spin-imbalanced Fermi gas can accommodate the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state has been the subject of intense study. This state, in which Cooper pairs obtain a nonzero momentum, has hitherto eluded experimental observation. Recently, we demonstrated that the FFLO state can be stabilized in a 3D Fermi gas, by adding a 1D periodic potential. Until now it was assumed that the FFLO wave vector always lies parallel to this periodic potential (FFLO-P). In this...
Source: http://arxiv.org/abs/1107.2613v2
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by V. Cirigliano; G. Ecker; H. Neufeld; A. Pich; J. Portoles
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A comprehensive overview of kaon decays is presented. The Standard Model predictions are discussed in detail, covering both the underlying short-distance electroweak dynamics and the important interplay of QCD at long distances. Chiral perturbation theory provides a universal framework for treating leptonic, semileptonic and nonleptonic decays including rare and radiative modes. All allowed decay modes with branching ratios of at least 10^(-11) are analyzed. Some decays with even smaller rates...
Source: http://arxiv.org/abs/1107.6001v3
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We show that a smooth, small enough Cauchy datum launches a unique classical solution of the relativistic Vlasov-Darwin (RVD) system globally in time. A similar result is claimed in Comm. Math. Sci. 6, 749-764 (2008) following the work in Int. Mat. Res. Not. 57191, 1-31 (2006). Our proof does not require estimates derived from the conservation of the total energy, nor those previously given on the transverse component of the electric field. These estimates are crucial in the references cited...
Source: http://arxiv.org/abs/1107.0947v2
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We consider the propagation of wave packets for a nonlinear Schr\"odinger equation, with a matrix-valued potential, in the semi-classical limit. For a matrix-valued potential, Strichartz estimates are available under long range assumptions. Under these assumptions, for an initial coherent state polarized along an eigenvector, we prove that the wave function remains in the same eigenspace, in a scaling such that nonlinear effects cannot be neglected. We also prove a nonlinear superposition...
Source: http://arxiv.org/abs/1203.4249v1
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Grand Unified Theories often involve additional Abelian group factors apart from the standard model hypercharge, that generally lead to loop-induced mixing gauge kinetic terms. In this letter, we show that at the one-loop level this effect can be avoided in many cases by a suitable choice of basis in group space and present a general scheme for the construction of this basis. In supersymmetric theories however, a residual mixing in the soft SUSY breaking gaugino mass terms may appear. We...
Source: http://arxiv.org/abs/1107.2806v2
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by Mikhail V. Berlinkov
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In 1964 \v{C}ern\'{y} conjectured that each $n$-state synchronizing automaton posesses a reset word of length at most $(n-1)^2$. From the other side the best known upper bound on the reset length (minimum length of reset words) is cubic in $n$. Thus the main problem here is to prove quadratic (in $n$) upper bounds. Since 1964, this problem has been solved for few special classes of \sa. One of this result is due to Kari \cite{Ka03} for automata with Eulerian digraphs. In this paper we introduce...
Source: http://arxiv.org/abs/1203.3402v1
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by Kevin G. Hare; Michael J. Mossinghoff
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Let $n$ be a positive integer, not a power of two. A \textit{Reinhardt polygon} is a convex $n$-gon that is optimal in three different geometric optimization problems: it has maximal perimeter relative to its diameter, maximal width relative to its diameter, and maximal width relative to its perimeter. For almost all $n$, there are many Reinhardt polygons with $n$ sides, and many of them exhibit a particular periodic structure. While these periodic polygons are well understood, for certain...
Source: http://arxiv.org/abs/1203.4107v2
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by B. Vakili; M. A. Gorji
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We study the modifications to the Coulomb's law when the background geometry is a $n$-dimensional maximally symmetric space, by using of the $n$-dimensional version of the Gauss' theorem. It is shown that some extra terms are added to the usual expression of the Coulomb electric field due to the curvature of the background space. Also, we consider the problem of existence of magnetic monopoles in such spaces and present analytical expressions for the corresponding magnetic fields and vector...
Source: http://arxiv.org/abs/1203.3375v1
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by V. A. Yuryev; L. V. Arapkina; M. S. Storozhevykh; V. A. Chapnin; K. V. Chizh; O. V. Uvarov; V. P. Kalinushkin; E. S. Zhukova; A. S. Prokhorov; I. E. Spektor; B. P. Gorshunov
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Issues of Ge hut cluster nucleation and growth at low temperatures on the Ge/Si(001) wetting layer are discussed on the basis of explorations performed by high resolution STM and in-situ RHEED. Data of HRTEM investigations of Ge/Si heterostructures are presented with the focus on low-temperature formation of perfect multilayer films. Exploration of the photovoltaic effect in Si p--i--n-structures with Ge quantum dots allowed us to propose a new approach to designing of infrared detectors. First...
Source: http://arxiv.org/abs/1203.5631v1
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by Marc Winter; Jerome Baudot; Auguste Besson; Gilles Claus; Andrei Dorokhov; Mathieu Goffe; Christine Hu-Guo; Frederic Morel; Isabelle Valin; Georgios Voutsinas; Liang Zhang
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CMOS Pixel Sensors are making steady progress towards the specifications of the ILD vertex detector. Recent developments are summarised, which show that these devices are close to comply with all major requirements, in particular the read-out speed needed to cope with the beam related background. This achievement is grounded on the double- sided ladder concept, which allows combining signals generated by a single particle in two different sensors, one devoted to spatial resolution and the other...
Source: http://arxiv.org/abs/1203.3750v1
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by Vyacheslav M. Boyko; Roman O. Popovych; Nataliya M. Shapoval
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Lie symmetries of systems of second-order linear ordinary differential equations with constant coefficients are exhaustively described over both the complex and real fields. The exact lower and upper bounds for the dimensions of the maximal Lie invariance algebras possessed by such systems are obtained using an effective algebraic approach.
Source: http://arxiv.org/abs/1203.0387v2
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by Yang Luo; Shravan Hanasoge; Jeroen Tromp; Frans Pretorius
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Galaxies observed today are likely to have evolved from density perturbations in the early universe. Perturbations that exceeded some critical threshold are conjectured to have undergone gravitational collapse to form primordial black holes (PBHs) at a range of masses. Such PBHs serve as candidates for cold dark matter and their detection would shed light on conditions in the early universe. Here we propose a mechanism to search for transits of PBHs through/nearby Earth by studying the...
Source: http://arxiv.org/abs/1203.3806v1
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by Giulio Caviglia; Aldo Conca
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Let V be the Veronese cubic surface in P^9. We classify the projections of V to P^8 whose coordinate rings are Koszul. In particular we obtain a purely theoretical proof of the Koszulness of the pinched Veronese, a result obtained originally by Caviglia using filtrations, deformations and computer assisted computations. To this purpose we extend, to certain complete intersections, results of Conca, Herzog, Trung and Valla concerning homological properties of diagonal algebras.
Source: http://arxiv.org/abs/1203.1949v2
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We give a slight extension of the Hermite-Hadamard inequality on simplices and we use it to establish error bounds of the operators connected with the approximate integration.
Source: http://arxiv.org/abs/0807.4130v3
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by M. F. Gharaibeh; J. M. Bizau; D. Cubaynes; S. Guilbaud; N. El Hassan; M. M. Al Shorman; C. Miron; C. Nicolas; E. Robert; C. Blancard; B. M. McLaughlin
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Absolute cross sections for the K-shell photoionization of C-like nitrogen ions were measured by employing the ion-photon merged-beam technique at the SOLEIL synchrotron radiation facility in Saint-Aubin, France. High-resolution spectroscopy with E/$\Delta$E $\approx$ 7,000 was achieved with the photon energy from 388 to 430 eV scanned with a band pass of 300 meV, and the 399.4 to 402 eV range with 60 meV. Experimental results are compared with theoretical predictions made from the...
Source: http://arxiv.org/abs/1203.4256v1
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In the paper of Montgomery, D. and Yang, C.T. [5], they discuss the de-suspension of smooth free actions of S1 on (2n+1)-dimensional homotopy spheres. In this paper we discuss the de-suspension of smooth free actions of S3 on (4n + 3)-dimensional homotopy spheres.
Source: http://arxiv.org/abs/1203.6097v2
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I consider the isolation of general relativity research from the rest of theoretical physics during the 1930s-1950s, and the subsequent reinvigoration of the field. I suggest that the main reason for the isolation was that relativists of the time did not develop heuristic concepts about the physics of the theory with which they could communicate with other physicists, and that the revival happened when they began to develop such concepts. A powerful heuristic today is the concept of a black...
Source: http://arxiv.org/abs/1203.3090v1
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by Pascal O. Vontobel
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It has recently been observed that the permanent of a non-negative square matrix, i.e., of a square matrix containing only non-negative real entries, can very well be approximated by solving a certain Bethe free energy function minimization problem with the help of the sum-product algorithm. We call the resulting approximation of the permanent the Bethe permanent. In this paper we give reasons why this approach to approximating the permanent works well. Namely, we show that the Bethe free...
Source: http://arxiv.org/abs/1107.4196v3
Robust design has been widely recognized as a leading method in reducing variability and improving quality. Most of the engineering statistics literature mainly focuses on finding "point estimates" of the optimum operating conditions for robust design. Various procedures for calculating point estimates of the optimum operating conditions are considered. Although this point estimation procedure is important for continuous quality improvement, the immediate question is "how...
Source: http://arxiv.org/abs/1203.4643v1
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by Michael Menzel; Rajiv Ranjan
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Cloud computing is the latest computing paradigm that delivers hardware and software resources as virtualized services in which users are free from the burden of worrying about the low-level system administration details. Migrating Web applications to Cloud services and integrating Cloud services into existing computing infrastructures is non-trivial. It leads to new challenges that often require innovation of paradigms and practices at all levels: technical, cultural, legal, regulatory, and...
Source: http://arxiv.org/abs/1203.3997v1
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by Jean-Guillaume Dumas; Dominique Duval; Laurent Fousse; Jean-Claude Reynaud
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We define a proof system for exceptions which is close to the syntax for exceptions, in the sense that the exceptions do not appear explicitly in the type of any expression. This proof system is sound with respect to the intended denotational semantics of exceptions. With this inference system we prove several properties of exceptions.
Source: http://arxiv.org/abs/1203.2900v1
Deb Cotton Secondline Collection
by BigRedCotton
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Source: https://www.youtube.com/watch?v=Sw9PGiJLjac Uploader: BigRedCotton Upload date: 20120521
Topics: Youtube, video, Entertainment, clip, 2012, 05, 20, 13, 03, 55, debcotton,...
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by C. Golabek; J. Billard; A. Allaoua; G. Bosson; O. Bourrion; C. Grignon; O. Guillaudin; L. Lebreton; F. Mayet; M. Petit; J. -P. Richer; D. Santos
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The AMANDE facility produces monoenergetic neutron fields from 2 keV to 20 MeV for metrological purposes. To be considered as a reference facility, fluence and energy distributions of neutron fields have to be determined by primary measurement standards. For this purpose, a micro Time Projection Chamber is being developed to be dedicated to measure neutron fields with energy ranging from 8 keV up to 1 MeV. In this work we present simulations showing that such a detector, which allows the...
Source: http://arxiv.org/abs/1203.2443v1
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by U. Buchenau
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In undercooled liquids, the anharmonicity of the interatomic potentials causes a volume increase of the inherent structures with increasing energy content. In most glass formers, this increase is stronger than the vibrational Gr\"uneisen volume expansion and dominates the thermal expansion of the liquid phase. For a gaussian distribution of inherent states in energy, the generic case, this implies a 1/T-squared temperature dependence of the additional thermal expansion and the additional...
Source: http://arxiv.org/abs/1203.3555v3
Forest Health Protection tech meeting. Region 6 Regional Office. Portland, Oregon. Photo by: Julie Johnson Date: November 7, 2012 Credit: USDA Forest Service, Region 6, State and Private Forestry, Forest Health Protection. Source: Aerial Survey Program collection. Image provided by USDA Forest Service, Region 6, State and Private Forestry, Forest Health Protection: www.fs.usda.gov/main/r6/forest-grasslandhealth
Topics: hollykearns, aleksandardozic, foresthealthprotection, kristenchadwick, usda, brucehostetler,...
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With a view to constructing a Morse/Floer homology theory for CMC hypersurfaces, we prove a compactness result modulo broken trajectories for eternal mean curvature flows with forcing term in compact, hyperbolic manifolds.
Source: http://arxiv.org/abs/1203.0544v1
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We propose to explain the dimming of distant supernovae as the combined effect of dark energy and a Lema\^itre-Tolman-Bondi (LTB) metric. We take dark energy to have a shear-dependent pressure $p_{DE}=(w_0+\epsilon w_1)\rho_{DE}$ where $\epsilon$ is the ratio of LTB shear to LTB expansion.
Source: http://arxiv.org/abs/1107.3028v3
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by Prasad Subramanian; Amit Shukla; Peter A. Becker
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Recently observed minute timescale variability of blazar emission at TeV energies has imposed severe constraints on jet models and TeV emission mechanisms. We focus on a robust jet instability to explain this variability. As a consequence of the bulk outflow of the jet plasma, the pressure is likely to be anisotropic, with the parallel pressure $P_{||}$ in the forward jet direction exceeding the perpendicular pressure $P_{\perp}$. Under these circumstances, the jet is susceptible to the...
Source: http://arxiv.org/abs/1203.5727v1
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by C. A. Giuppone; M. H. M. Morais; G. Boué; A. C. M. Correia
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The HD\,196885 system is composed of a binary star and a planet orbiting the primary. The orbit of the binary is fully constrained by astrometry, but for the planet the inclination with respect to the plane of the sky and the longitude of the node are unknown. Here we perform a full analysis of the HD\,196885 system by exploring the two free parameters of the planet and choosing different sets of angular variables. We find that the most likely configurations for the planet is either nearly...
Source: http://arxiv.org/abs/1203.5249v1