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Deb Cotton Secondline Collection
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Money Wasters bringing that 6th Ward fire all day long For info on second line parades and brass band shows, follow me on Facebook and Twitter: Big Red Cotton Source: https://www.youtube.com/watch?v=dZj9U7f0t3Q Uploader: BigRedCotton Upload date: 20110526
Topics: Youtube, video, Entertainment, Stooges Brass Band, New Orleans, Treme, Sixth Ward, 6th Ward,...
Deb Cotton Secondline Collection
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his daddy Bo Monkey Red doing hat tricks Source: https://www.youtube.com/watch?v=nmtWQq-oxws Uploader: BigRedCotton Upload date: 20111021
Topics: Youtube, video, Entertainment, Candlelight Lounge, New Orleans, Corey Henry, debcotton,...
Deb Cotton Secondline Collection
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Second Division of YMO Jr. coming out the door featuring Young Pin Stripes Brass Band Source: https://www.youtube.com/watch?v=G-I42KSh_-E Uploader: BigRedCotton Upload date: 20110926
Topics: Youtube, video, Entertainment, Second line, New Orleans, Young Pin Stripe Brass Band, debcotton,...
Deb Cotton Secondline Collection
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Source: https://www.youtube.com/watch?v=fwdTgCQPMmo Uploader: BigRedCotton Upload date: 20110105
Topics: Youtube, video, Music, Lady Buckjumpers, second line parade, New Orleans, Rebirth Brass Band,...
Deb Cotton Secondline Collection
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Source: https://www.youtube.com/watch?v=T5Dx-BHUf5c Uploader: BigRedCotton Upload date: 20110104
Topics: Youtube, video, Entertainment, Second Line, Brass Band, New Orleans, Buckjumping, Hot 8 Brass Band,...
Deb Cotton Secondline Collection
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Source: https://www.youtube.com/watch?v=JAW2VzHv8hs Uploader: BigRedCotton Upload date: 20110116
Topics: Youtube, video, Entertainment, New Orleans, Ninth Ward, Second line parade, Stooges Brass Band,...
Arxiv.org
by Joerg Enders; Reto Müller; Peter M. Topping
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We define several notions of singular set for Type I Ricci flows and show that they all coincide. In order to do this, we prove that blow-ups around singular points converge to nontrivial gradient shrinking solitons, thus extending work of Naber. As a by-product we conclude that the volume of a finite-volume singular set vanishes at the singular time. We also define a notion of density for Type I Ricci flows and use it to prove a regularity theorem reminiscent of White's partial regularity...
Source: http://arxiv.org/abs/1005.1624v2
Arxiv.org
by Clare Horsman; Katherine L. Brown; William J. Munro; Vivien M. Kendon
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Efficient generation of cluster states is crucial for engineering large-scale measurement-based quantum computers. Hybrid matter-optical systems offer a robust, scalable path to this goal. Such systems have an ancilla which acts as a bus connecting the qubits. We show that by generating smaller cluster "Lego bricks", reusing one ancilla per brick, the cluster can be produced with maximal efficiency, requiring fewer than half the operations compared with no bus reuse. By reducing the...
Source: http://arxiv.org/abs/1005.1621v6
Arxiv.org
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We consider brave new cochain extensions $F(BG_+,R)\to F(EG_+,R)$, where $R$ is either a Lubin-Tate spectrum $E_n$ or the related 2-periodic Morava K-theory $K_n$, and $G$ is a finite group. When $R$ is an Eilenberg-Mac Lane spectrum, in some good cases such an extension is a $G$-Galois extension in the sense of John Rognes, but not always faithful. We prove that for $E_n$ and $K_n$ these extensions are always faithful in the $K_n$ local category. However, for a cyclic $p$-group $C_{p^r}$, the...
Source: http://arxiv.org/abs/1005.1662v6
Arxiv.org
by C. Hamner; J. J. Chang; P. Engels; M. A. Hoefer
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The dynamics of two penetrating superfluids exhibit an intriguing variety of nonlinear effects. Using two distinguishable components of a Bose-Einstein condensate, we investigate the counterflow of two superfluids in a narrow channel. We present the first experimental observation of trains of dark-bright solitons generated by the counterflow. Our observations are theoretically interpreted by three-dimensional numerical simulations for the coupled Gross-Pitaevskii (GP) equations and the analysis...
Source: http://arxiv.org/abs/1005.2610v2
Arxiv.org
by Miklós Abért; Gábor Elek
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We study profinite actions of residually finite groups in terms of weak containment. We show that two strongly ergodic profinite actions of a group are weakly equivalent if and only if they are isomorphic. This allows us to construct continuum many pairwise weakly inequivalent free actions of a large class of groups, including free groups and linear groups with property (T). We also prove that for chains of subgroups of finite index, Lubotzky's property ($\tau$) is inherited when taking the...
Source: http://arxiv.org/abs/1005.3188v3
Arxiv.org
by Swan Dubois; Toshimitsu Masuzawa; Sébastien Tixeuil
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Self-stabilization is a versatile approach to fault-tolerance since it permits a distributed system to recover from any transient fault that arbitrarily corrupts the contents of all memories in the system. Byzantine tolerance is an attractive feature of distributed systems that permits to cope with arbitrary malicious behaviors. Combining these two properties proved difficult: it is impossible to contain the spatial impact of Byzantine nodes in a self-stabilizing context for global tasks such...
Source: http://arxiv.org/abs/1005.3367v2
Arxiv.org
by Jinglei Cui; Xin Zhang
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Because of an old quasar APM 08279+5255 at $z=3.91$, some dark energy models face the challenge of the cosmic age problem. It has been shown by Wei and Zhang [Phys. Rev. D {\bf 76}, 063003 (2007)] that the holographic dark energy model is also troubled with such a cosmic age problem. In order to accommodate this old quasar and solve the age problem, we propose in this Letter to consider the interacting holographic dark energy in a non-flat universe. We show that the cosmic age problem can be...
Source: http://arxiv.org/abs/1005.3587v3
Arxiv.org
by Andrea De Simone; Michele Maggiore; Antonio Riotto
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Excursion set theory, where density perturbations evolve stochastically with the smoothing scale, provides a method for computing the mass function of cosmological structures like dark matter halos, sheets and filaments. The computation of these mass functions is mapped into the so-called first-passage time problem in the presence of a moving barrier. In this paper we use the path integral formulation of the excursion set theory developed recently to analytically solve the first-passage time...
Source: http://arxiv.org/abs/1007.1903v2
Arxiv.org
by Antonio Negretti; Rosario Fazio; Tommaso Calarco
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We introduce a new approach to assess the error of control problems we aim to optimize. The method offers a strategy to define new control pulses that are not necessarily optimal but still able to yield an error not larger than some fixed a priori threshold, and therefore provide control pulses that might be more amenable for an experimental implementation. The formalism is applied to an exactly solvable model and to the Landau-Zener model, whose optimal control problem is solvable only...
Source: http://arxiv.org/abs/1007.2405v2
Arxiv.org
by Luca Tagliacozzo; Guifre Vidal
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A lattice gauge theory is described by a redundantly large vector space that is subject to local constraints, and can be regarded as the low energy limit of an extended lattice model with a local symmetry. We propose a numerical coarse-graining scheme to produce low energy, effective descriptions of lattice models with a local symmetry, such that the local symmetry is exactly preserved during coarse-graining. Our approach results in a variational ansatz for the ground state(s) and low energy...
Source: http://arxiv.org/abs/1007.4145v2
Arxiv.org
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A new mechanism of thermalization involving a direct energy cascade is obtained in the truncated Gross-Pitaevskii dynamics. A long transient with partial thermalization at small-scales is observed before the system reaches equilibrium. Vortices are found to disappear as a prelude to final thermalization. A bottleneck that produces spontaneous effective self-truncation and delays thermalization is characterized when large dispersive effects are present at the truncation wavenumber. Order of...
Source: http://arxiv.org/abs/1007.4441v3
Arxiv.org
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We study the disorder effect on the excitonic gap generation caused by strong Coulomb interaction in graphene. By solving the self-consistently coupled equations of dynamical fermion gap $m$ and disorder scattering rate $\Gamma$, we found a critical line on the plane of interaction strength $\lambda$ and disorder strength $g$. The phase diagram is divided into two regions: in the region with large $\lambda$ and small $g$, $m \neq 0$ and $\Gamma = 0$; in the other region, $m = 0$ and $\Gamma...
Source: http://arxiv.org/abs/1007.4538v4
Arxiv.org
by V. I. Kuvshinov; A. V. Kuzmin; V. A. Piatrou
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Effective Hamiltonian for the kicked double well system was derived using the Campbell-Baker-Hausdorff expansion formula. Asymmetric model for the kicked system was constructed. Analytical description of the quasienergy levels splittings for the low laying doublets was given in the framework of the model. Numerical calculations confirm applicability of the proposed effective asymmetric approach for the double well system with the kick-type perturbation.
Source: http://arxiv.org/abs/1107.0554v1
Arxiv.org
by Jose' Antonio Alvarez-Bermejo; Juan Antonio Lopez-Ramos; Joachim Rosenthal; Davide Schipani
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In this paper we propose a new protocol to manage multicast key distribution. The protocol is based on the use of orthogonal systems in vector spaces. The main advantage in comparison to existing multicast key management protocols is that the length and the number of the messages which have to be sent is considerably smaller. This makes the protocol attractive when the number of legitimate receivers is large.
Source: http://arxiv.org/abs/1107.0586v1
Arxiv.org
by J. Ebrero; G. A. Kriss; J. S. Kaastra; R. G. Detmers; K. C. Steenbrugge; E. Costantini; N. Arav; S. Bianchi; M. Cappi; G. Branduardi-Raymont; M. Mehdipour; P. -O. Petrucci; C. Pinto; G. Ponti
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We present here the results of a 180 ks Chandra-LETGS observation as part of a large multi-wavelength campaign on Mrk 509. We study the warm absorber in Mrk 509 and use the data from a simultaneous HST-COS observation in order to assess whether the gas responsible for the UV and X-ray absorption are the same. We analyzed the LETGS X-ray spectrum of Mrk 509 using the SPEX fitting package. We detect several absorption features originating in the ionized absorber of the source, along with resolved...
Source: http://arxiv.org/abs/1107.0660v1
Arxiv.org
by Dilip Kumar Ghosh; Manas Maity; Sourov Roy
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Recently CDF has reported a 4.1 sigma excess in the distribution of the dijet invariant mass between 120-160 GeV in Wjj event sample in 7.3 fb^{-1} of data, which has generated considerable interest. We offer a possible explanation of this observation in the general framework of MSSM with R-parity violation through resonance production of tau sneutrino decaying into the LSP stau_1 and W boson. We also give the predictions of this scenario for the LHC operating at 7 TeV center of mass energy.
Source: http://arxiv.org/abs/1107.0649v2
Arxiv.org
by David Kalaj; Saminathan Ponnusamy; Matti Vuorinen
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Let ${\mathcal H}$ denote the class of all normalized complex-valued harmonic functions $f=h+\bar{g}$ in the unit disk ${\mathbb D}$, and let $K=H+\bar{G}$ denote the harmonic Koebe function. Let $a_n,b_n, A_n, B_n$ denote the Maclaurin coefficients of $h,g,H,G$, and $${\mathcal F}=\{f=h+\bar{g}\in {\mathcal H}:\,|a_n|\leq A_n and |b_n|\leq B_n for n\geq 1}. $$ We show that the radius of univalence of the family ${\mathcal F}$ is $0.112903...$. We also show that this number is also the radius...
Source: http://arxiv.org/abs/1107.0610v1
Arxiv.org
by Richard de Grijs
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Using our recently improved understanding of star cluster physics, we are now within reach of answering a number of fundamental questions in contemporary astrophysics. Star cluster physics has immediate bearing on questions ranging from the physical basis of the stellar initial mass function - Do any O-type stars form in isolation? What is the relative importance of stochastic (random) star formation versus competitive accretion? - to the build-up of the most massive clusters - Does the cluster...
Source: http://arxiv.org/abs/1107.0800v1
Arxiv.org
by K. Cho; H. Kim; M. A. Tanatar; J. Hu; B. Qian; Z. Q. Mao; R. Prozorov
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We report tunnel diode resonator measurements of in-plane London penetration depth, $\lambda(T)$, in optimally-doped single crystals of Fe(Te$_{0.58}$Se$_{0.42}$) with $T_c\sim$ 14.8 K. Systematic measurements were carried out for six samples with different size and surface roughness. The power-law behavior, $\Delta \lambda(T) = A T^n$ was found for all samples with the average exponent $n_{avg} = 2.3 \pm 0.1$ and the pre-factor $A_{avg} = 1.0 \pm 0.2$ nm/K$^{2.3}$. The average superfluid...
Source: http://arxiv.org/abs/1107.0711v1
Arxiv.org
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We present a search for the pair production of first generation scalar leptoquarks (LQ) in data corresponding to an integrated luminosity of 5.4 fb$^{-1}$ collected with the D0 detector at the Fermilab Tevatron Collider in ppbar collisions at $\sqrt{s}=1.96$ TeV. In the channel $LQ \bar{LQ} \rightarrow e\nu_e qq'$, where q, q' are u or d quarks, no significant excess of data over background is observed, and we set a 95% C.L. lower limit of 326 GeV on the leptoquark mass, assuming equal...
Source: http://arxiv.org/abs/1107.1849v1
Arxiv.org
by Jorge L. Cervantes-Cota; George Smoot
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This is a brief review of the standard model of cosmology. We first introduce the FRW models and their flat solutions for energy fluids playing an important role in the dynamics at different epochs. We then introduce different cosmological lengths and some of their applications. The later part is dedicated to the physical processes and concepts necessary to understand the early and very early Universe and observations of it.
Source: http://arxiv.org/abs/1107.1789v2
Arxiv.org
by Ernst Trojan; George V. Vlasov
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The 'absolute stiff' matter ($P=E$) can be a Fermi or Bose gas of particles with the energy spectrum $\epsilon_p \sim p^q$ in $q$-dimensional space, particularly $\epsilon_p =p^3/m^2$ in 3-dimensional space. We obtain its pressure, particle number density and heat capacity at finite temperature. The behavior of 'absolute stiff' medium is determined by characteristic temperature $T_c=6\pi ^2n/(\gamma m^2)$. At low temperature the heat capacity obeys the linear law $C_V\sim T$ for both fermionic...
Source: http://arxiv.org/abs/1107.1782v5
Arxiv.org
by Pavle V. M. Blagojević; Benjamin Matschke; Günter M. Ziegler
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We prove that any continuous map of an N-dimensional simplex Delta_N with colored vertices to a d-dimensional manifold M must map r points from disjoint rainbow faces of Delta_N to the same point in M: For this we have to assume that N \geq (r-1)(d+1), no r vertices of Delta_N get the same color, and our proof needs that r is a prime. A face of Delta_N is a rainbow face if all vertices have different colors. This result is an extension of our recent "new colored Tverberg theorem", the...
Source: http://arxiv.org/abs/1107.1904v1
Arxiv.org
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In this paper, we prove that every iterative differential embedding problem over an algebraic function field in positive characteristic with an algebraically closed field of constants has a proper solution.
Source: http://arxiv.org/abs/1107.1962v1
Arxiv.org
by Slavik Jablan; Ljiljana Radovic
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This article provides an overview of relative strengths of polynomial invariants of knots and links, such as the Alexander, Jones, Homflypt, and Kaufman two-variable polynomial, Khovanov homology, factorizability of the polynomials, and knot primeness detection.
Source: http://arxiv.org/abs/1107.1877v1
Arxiv.org
by Gero von Gersdorff
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We review Electroweak breaking in warped Extra Dimensions and show how it is constrained by Electroweak precision tests. We then proceed to describe a model which is based on a bulk Higgs field and a metric that is deformed from the usual five dimensional Anti de Sitter space near the Infrared (IR) boundary. It allows to softly decouple the Higgs field from the Kaluza Klein excitations near the IR and thus reduces their contribution to the precision observables.
Source: http://arxiv.org/abs/1107.1989v2
Arxiv.org
by Eric S. Perlman; Markos Georganopoulos; Herman L. Marshall; Daniel A. Schwartz; C. A. Padgett; Jonathan Gelbord; J. E. J. Lovell; Diana M. Worrall; Mark Birkinshaw; David W. Murphy; David L. Jauncey
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We present deep {\it HST, Chandra, VLA} and {\it ATCA} images of the jets of PKS 0208--512 and PKS 1202--262, which were found in a {\it Chandra} survey of a flux-limited sample of flat-spectrum radio quasars with jets (see Marshall et al., 2005). We discuss in detail their X-ray morphologies and spectra. We find optical emission from one knot in the jet of PKS 1202--262 and two regions in the jet of PKS 0208--512. The X-ray emission of both jets is most consistent with external Comptonization...
Source: http://arxiv.org/abs/1107.2058v1
Arxiv.org
by Hassan Ghozlan; Gerhard Kramer
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A discrete-time two-user interference channel model is developed that captures non-linear phenomena that arise in optical fiber communication employing wavelength-division multiplexing (WDM). The effect of non-linearity is that an amplitude variation on one carrier induces a phase variation on the other carrier. Moreover, the model captures the effect of group velocity mismatch that introduces memory in the channel. It is shown that both users can achieve the maximum pre-log factor of 1...
Source: http://arxiv.org/abs/1107.2100v1
Arxiv.org
by Gregory J. Galloway; Kristen Schleich; Donald M. Witt
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We use existence results for Jang's equation and marginally outer trapped surfaces (MOTSs) in 2+1 gravity to obtain nonexistence of geons in 2+1 gravity. In particular, our results show that any 2+1 initial data set, which obeys the dominant energy condition with cosmological constant \Lambda \geq 0 and which satisfies a mild asymptotic condition, must have trivial topology. Moreover, any data set obeying these conditions cannot contain a MOTS. The asymptotic condition involves a cutoff at a...
Source: http://arxiv.org/abs/1005.0168v3
Arxiv.org
by Yoh Tanimoto
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Let g be a simple Lie algebra, Lg be the loop algebra of g. Fixing a point in S^1 and identifying the real line with the punctured circle, we consider the subalgebra Sg of Lg of rapidly decreasing elements on R. We classify the translation-invariant 2-cocycles on Sg. We show that the ground state representation of Sg is unique for each cocycle. These ground states correspond precisely to the vacuum representations of Lg.
Source: http://arxiv.org/abs/1005.0270v2
Arxiv.org
by Vladimir Vovk
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This paper considers possible price paths of a financial security in an idealized market. Its main result is that the variation index of typical price paths is at most 2; in this sense, typical price paths are not rougher than typical paths of Brownian motion. We do not make any stochastic assumptions and only assume that the price path is positive and right-continuous. The qualification "typical" means that there is a trading strategy (constructed explicitly in the proof) that risks...
Source: http://arxiv.org/abs/1005.0279v2
Arxiv.org
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We prove that the inclusion of every closed exact Lagrangian with vanishing Maslov class in a cotangent bundle is a homotopy equivalence. We start by adapting an idea of Fukaya-Seidel-Smith to prove that such a Lagrangian is equivalent to the zero section in the Fukaya category with integral coefficients. We then study an extension of the Fukaya category in which Lagrangians equipped with local systems of arbitrary dimension are admitted as objects, and prove that this extension is generated,...
Source: http://arxiv.org/abs/1005.0358v3
Arxiv.org
by Stefan Antusch; Stephen F. King; Martin Spinrath
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We propose a supersymmetric A4 x SU(5) model of quasi-degenerate neutrinos which predicts the effective neutrino mass m_ee relevant for neutrinoless double beta decay to be proportional to the neutrino mass scale, thereby allowing its determination approximately independently of unknown Majorana phases. Such a natural quasi-degeneracy is achieved by using the A4 (as an example of a non-Abelian family symmetry with real triplet representations) to enforce a type II seesaw contribution to the...
Source: http://arxiv.org/abs/1005.0708v2
Arxiv.org
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The size of minimal perturbations to roots of parameterized equations can be estimated reliably from linearizations of the equations.
Source: http://arxiv.org/abs/1005.0751v3
Arxiv.org
by Sourav Chatterjee; Persi Diaconis; Allan Sly
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Large graphs are sometimes studied through their degree sequences (power law or regular graphs). We study graphs that are uniformly chosen with a given degree sequence. Under mild conditions, it is shown that sequences of such graphs have graph limits in the sense of Lov\'{a}sz and Szegedy with identifiable limits. This allows simple determination of other features such as the number of triangles. The argument proceeds by studying a natural exponential model having the degree sequence as a...
Source: http://arxiv.org/abs/1005.1136v5
Arxiv.org
by Brian A. Ruzicka; Shuai Wang; Lalani K. Werake; Ben Weintrub; Kian Ping Loh; Hui Zhao
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We report an optical study of charge transport in graphene. Diffusion of hot carriers in epitaxial graphene and reduced graphene oxide samples are studied using an ultrafast pump-probe technique with a high spatial resolution. Spatiotemporal dynamics of hot carriers after a point-like excitation are monitored. Carrier diffusion coefficients of 11,000 and 5,500 squared centimeters per second are measured in epitaxial graphene and reduced graphene oxide samples, respectively, with a carrier...
Source: http://arxiv.org/abs/1005.3850v2
Arxiv.org
by Brian J. Burt; Andrea N. Lommen; Lee Samuel Finn
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Pulsar Timing Arrays (PTAs) use high accuracy timing of a collection of low timing noise pulsars to search for gravitational waves in the microhertz to nanohertz frequency band. The sensitivity of such a PTA depends on (a) the direction of the gravitational wave source, (b) the timing accuracy of the pulsars in the array and (c) how the available observing time is allocated among those pulsars. Here, we present a simple way to calculate the sensitivity of the PTA as a function of direction of a...
Source: http://arxiv.org/abs/1005.5163v3
Arxiv.org
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A sequence $x_1,...,x_n,...$ of discrete-valued observations is generated according to some unknown probabilistic law (measure) $\mu$. After observing each outcome, it is required to give the conditional probabilities of the next observation. The realizable case is when the measure $\mu$ belongs to an arbitrary but known class $C$ of process measures. The non-realizable case is when $\mu$ is completely arbitrary, but the prediction performance is measured with respect to a given set $C$ of...
Source: http://arxiv.org/abs/1005.5603v2
Arxiv.org
by J. -P. Beaulieu; G. Tinetti; D. M. Kipping; I. Ribas; R. J. Barber; J. Y-K. Cho; I. Polichtchouk; J. Tennyson; S. N. Yurchenko; C. A. Griffith; V. Batista; I. Waldmann; S. Miller; S. Carey; O. Mousis; S. J. Fossey; A. Aylward
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We present an analysis of seven primary transit observations of the hot Neptune GJ436b at 3.6, 4.5 and $8~\mu$m obtained with the Infrared Array Camera (IRAC) on the Spitzer Space Telescope. After correcting for systematic effects, we fitted the light curves using the Markov Chain Monte Carlo technique. Combining these new data with the EPOXI, HST and ground-based $V, I, H$ and $K_s$ published observations, the range $0.5-10~\mu$m can be covered. Due to the low level of activity of GJ436, the...
Source: http://arxiv.org/abs/1007.0324v3
Arxiv.org
by Maryam Modjaz; L. Kewley; J. S. Bloom; A. V. Filippenko; D. Perley; J. M. Silverman
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Metallicity is expected to influence not only the lives of massive stars but also the outcome of their deaths as supernovae (SNe) and as gamma-ray bursts (GRBs). However, there are surprisingly few direct measurements of the local metallicities of different flavors of core-collapse SNe. Here we present the largest existing set of host-galaxy spectra with H II region emission lines at the sites of 35 stripped-envelope core-collapse SNe. We derive local oxygen abundances in a robust manner in...
Source: http://arxiv.org/abs/1007.0661v2
Arxiv.org
by Wen-yuan Yang
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In this note, we prove that separable subgroups have bounded packing in ambient groups. The notion bounded packing was introduced by Hruska and Wise and in particular, our result answers positively a question of theirs, asking whether each subgroup of a virtually polycyclic group has the bounded packing property.
Source: http://arxiv.org/abs/1007.0678v2
Arxiv.org
by Suijie Wang; Xiaogang Liu
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This paper studies the Laplacian spectral characterization of some graph products. We consider a class of connected graphs: $\mathscr{G}={G : |EG|\leq|VG|+1}$, and characterize all graphs $G\in\mathscr{G}$ such that the products $G\times K_m$ are $L$-DS graphs. The main result of this paper states that, if $G\in\mathscr{G}$, except for $C_{6}$ and $\Theta_{3,2,5}$, is $L$-DS graph, so is the product $G\times K_{m}$. In addition, the $L$-cospectral graphs with $C_{6}\times K_{m}$ and...
Source: http://arxiv.org/abs/1007.2472v3
Arxiv.org
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We consider the pointwise weighted approximation by Bernstein operators with inner singularities. The related weight functions are weights $\bar{w}(x)=|x-\xi|^\alpha(0
Source: http://arxiv.org/abs/1007.2562v5
Arxiv.org
by L. V. Gerasimov; I. M. Sokolov; D. V. Kupriyanov; R. G. Olave; M. D. Havey
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We show that coherent multiple light scattering, or diffuse light propagation, in a disordered atomic medium, prepared at ultra-low temperatures, can be be effectively delayed in the presence of a strong control field initiating a stimulated Raman process. On a relatively short time scale, when the atomic system can preserve its configuration and effects of atomic motion can be ignored, the scattered signal pulse, diffusely propagating via multiple coherent scattering through the medium, can be...
Source: http://arxiv.org/abs/1007.2682v3
Arxiv.org
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Scalar-tensor gravity is one of the most competitive gravity theory to Einstein's relativity. We reconstruct the exact de Sitter solution in scalar-tensor gravity, in which the non-minimal coupling scalar is rolling along the potential. This solution may have some relation to the early inflation and present acceleration of the universe. We investigated its primordial quantum perturbation around the adiabatic vacuum. We put forward for the first time that exact de Sitter generates non-exactly...
Source: http://arxiv.org/abs/1007.3096v2
Arxiv.org
by Scott M. Garrabrant; Jim Hoste; Patrick D. Shanahan
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In this paper we use continued fractions to study a partial order on the set of 2-bridge knots derived from the work of Ohtsuki, Riley, and Sakuma. We establish necessary and sufficient conditions for any set of 2-bridge knots to have an upper bound with respect to the partial order. Moreover, given any 2-bridge knot K we characterize all other 2-bridge knots J such that {K, J} has an upper bound. As an application we answer a question of Suzuki, showing that there is no upper bound for the set...
Source: http://arxiv.org/abs/1007.3278v2
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by Itaï Ben Yaacov; Alexander Berenstein; Julien Melleray
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We define and study the notion of \emph{ample metric generics} for a Polish topological group, which is a weakening of the notion of ample generics introduced by Kechris and Rosendal in \cite{Kechris-Rosendal:Turbulence}. Our work is based on the concept of a \emph{Polish topometric group}, defined in this article. Using Kechris and Rosendal's work as a guide, we explore consequences of ample metric generics (or, more generally, ample generics for Polish topometric groups). Then we provide...
Source: http://arxiv.org/abs/1007.3367v3
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Following a suggestion of A. Connes (see [Co] {\S} I.1), we build up a (first) simple natural structure of a no finitely generated braided non-commutative Hopf algebra, suggested by elementary quantum mechanics.
Source: http://arxiv.org/abs/1007.3728v3
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by Nicolas Didier; Stefano Pugnetti; Yaroslav M. Blanter; Rosario Fazio
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Measuring the quantum dynamics of a mechanical system, when few phonons are involved, remains a challenge. We show that a superconducting microwave resonator linearly coupled to the mechanical mode constitutes a very powerful probe for this scope. This new coupling can be much stronger than the usual radiation pressure interaction by adjusting a gate voltage. We focus on the detection of phonon blockade, showing that it can be observed by measuring the statistics of the light in the cavity. The...
Source: http://arxiv.org/abs/1007.4714v2
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We search for single-photon decays of the Upsilon(1S) resonance, Upsilon->gamma+invisible, where the invisible state is either a particle of definite mass, such as a light Higgs boson A0, or a pair of dark matter particles, chi chi-bar. Both A0 and chi are assumed to have zero spin. We tag Upsilon(1S) decays with a dipion transition Upsilon(2S)->pi+pi-Upsilon(1S) and look for events with a single energetic photon and significant missing energy. We find no evidence for such processes in...
Source: http://arxiv.org/abs/1007.4646v2
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Inductive learning is based on inferring a general rule from a finite data set and using it to label new data. In transduction one attempts to solve the problem of using a labeled training set to label a set of unlabeled points, which are given to the learner prior to learning. Although transduction seems at the outset to be an easier task than induction, there have not been many provably useful algorithms for transduction. Moreover, the precise relation between induction and transduction has...
Source: http://arxiv.org/abs/1107.0046v1
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We find a resonance free region polynomially close to the critical line on Conformally compact manifolds with polyhomogeneous metric.
Source: http://arxiv.org/abs/1107.0091v1
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by Holun Cheng; Ser Peow Tan; Yidan Zheng
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For any two configurations of ordered points $p=(p_{1},...,\p_{N})$ and $q=(q_{1},...,q_{N})$ in Euclidean space $E^d$ such that $q$ is an expansion of $p$, there exists a continuous expansion from $p$ to $q$ in dimension 2d; Bezdek and Connelly used this to prove the Kneser-Poulsen conjecture for the planar case. In this paper, we show that this construction is optimal in the sense that for any $d \ge 2$ there exists configurations of $(d+1)^2$ points $p$ and $q$ in $E^d$ such that $q$ is an...
Source: http://arxiv.org/abs/1107.0140v1
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The aim of this review is to describe the nature, formation and evolution of the three kinds of high mass X-ray binary (HMXB) population: i. systems hosting Be stars (BeHMXBs), ii. systems accreting the stellar wind of supergiant stars (sgHMXBs), and iii. supergiant stars overflowing their Roche lobe. There are now many new observations, from the high-energy side (mainly from the INTEGRAL satellite), complemented by multi-wavelength observations (mainly in the optical, near and mid-infrared...
Source: http://arxiv.org/abs/1107.0231v1
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by Kenneth W. Desmond; Umberto Villa; Mike Newey; Wolfgang Losert
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In this study we characterize the rheology of fluidized granular matter subject to secondary forcing. Our approach consists of first fluidizing granular matter in a drum half filled with grains via simple rotation, and then superimposing oscillatory shear perpendicular to the downhill flow direction. The response of the system is mostly linear, with a phase lag between the grain motion and the oscillatory forcing. The rheology of the system can be well characterize by the GDR-Midi model if the...
Source: http://arxiv.org/abs/1107.0357v1
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We use numerical simulation to examine the possibility of a reversible liquid-liquid transition in supercooled water and related systems. In particular, for two atomistic models of water, we have computed free energies as functions of multiple order parameters, where one is density and another distinguishes crystal from liquid. For a range of temperatures and pressures, separate free energy basins for liquid and crystal are found, conditions of phase coexistence between these phases are...
Source: http://arxiv.org/abs/1107.0337v2
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The drift velocity in drift tubes of the CMS muon chambers is a key parameter for the muon track reconstruction and trigger. It needs to be monitored precisely in order to detect any deviation from its nominal value. A change in absolute pressure, a variation of the gas admixture or a contamination of the chamber gas by air affect the drift velocity. Furthermore, the temperature and magnetic field influence its value. First data, taken with a dedicated Velocity Drift Chamber (VDC) built by RWTH...
Source: http://arxiv.org/abs/1107.0358v1
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by Liliana Borcea; Vladimir Druskin; Fernando Guevara Vasquez; Alexander V. Mamonov
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We review a resistor network approach to the numerical solution of the inverse problem of electrical impedance tomography (EIT). The networks arise in the context of finite volume discretizations of the elliptic equation for the electric potential, on sparse and adaptively refined grids that we call optimal. The name refers to the fact that the grids give spectrally accurate approximations of the Dirichlet to Neumann map, the data in EIT. The fundamental feature of the optimal grids in...
Source: http://arxiv.org/abs/1107.0343v1
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by Adam R Foster; Paola Testa
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New calculations of the energy levels, radiative transition rates and collisional excitation rates of \ion{Fe}{ix} have been carried out using the Flexible Atomic Code, paying close attention to experimentally identified levels and extending existing calculations to higher energy levels. For lower levels, R-matrix collisional excitation rates from earlier work have been used. Significant emission is predicted by these calculations in the 5f-3d transitions, which will impact analysis of SDO AIA...
Source: http://arxiv.org/abs/1107.0470v2
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by H. B. Nersisyan; K. A. Sargsyan; D. A. Osipyan; M. V. Sargsyan; H. H. Matevosyan
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The study of hot plasma expansion in a magnetic field is of interest for many astrophysical applications. In order to observe this process in laboratory, an experiment is proposed in which an ultrashort laser pulse produces a high-temperature plasma by irradiation of a small target. In this paper an analytical model is proposed for an expanding plasma cloud in an external dipole or homogeneous magnetic field. The model is based on the self-similar solution of a similar problem which deals with...
Source: http://arxiv.org/abs/1107.0457v2
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by Lars Sonnenschein
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A dedicated cosmic muon Monte-Carlo event generator CMSCGEN has been developed for the CMS experiment. The simulation relies on parameterisations of the muon energy and the incidence angle, based on measured and simulated data of the cosmic muon flux. The geometry and material density of the CMS infrastructure underground and surrounding geological layers are also taken into account. The event generator is integrated into the CMS detector simulation chain of the existing software framework....
Source: http://arxiv.org/abs/1107.0427v1
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n this paper, we consider the endomorphism algebras of infinitely generated tilting modules of the form $R_{\mathcal U}\oplus R_{\mathcal U}/R$ over tame hereditary $k$-algebras $R$ with $k$ an arbitrary field, where $R_{\mathcal{U}}$ is the universal localization of $R$ at an arbitrary set $\mathcal{U}$ of simple regular $R$-modules, and show that the derived module category of $\End_R(R_{\mathcal U}\oplus R_{\mathcal U}/R)$ is a recollement of the derived module category $\D{R}$ of $R$ and...
Source: http://arxiv.org/abs/1107.0444v1
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by Masahiro Kumabe; H. Reiju Mihara
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The Nakamura number of a simple game plays a critical role in preference aggregation (or multi-criterion ranking): the number of alternatives that the players can always deal with rationally is less than this number. We comprehensively study the restrictions that various properties for a simple game impose on its Nakamura number. We find that a computable game has a finite Nakamura number greater than three only if it is proper, nonstrong, and nonweak, regardless of whether it is monotonic or...
Source: http://arxiv.org/abs/1107.0439v1
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We describe paths in the configuration space of (3+1) dimensional QED whose relative quantum phase (or relative phase in the functional integral) depends on the value of the theta angle. The final configurations on the two paths are related by a gauge transformation but differ in magnetic helicity or Chern-Simons number. Such configurations must exhibit gauge potentials that fall off no faster than 1/r in some region of finite solid angle, although they need not have net magnetic charge (i.e.,...
Source: http://arxiv.org/abs/1107.0756v1
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by Patrick Spradlin
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Precision measurements in charm physics offer a window into a unique sector of potential New Physics interactions. LHCb is poised to become a world leading experiment for charm physics, recording enormous samples with a detector tailored for flavor physics. This article presents recent charm production, CPV, and mixing studies from LHCb, including LHCb's first charm CP asymmetry measurement with 37 pb^-1 of data collected in 2010.
Source: http://arxiv.org/abs/1107.0752v1
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We consider the zeros distributions on the derivatives of difference polynomials of meromorphic functions, and present some results which can be seen as the discrete analogues of Hayman conjecture \cite{hayman1}, also partly answer the question given in \cite[P448]{luolin}. We also investigate the uniqueness problems of difference-differential polynomials of entire functions sharing one common value. These theorems improve the results of Luo and Lin\cite{luolin} and some results of present...
Source: http://arxiv.org/abs/1107.0773v1
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by Naiara Arrizabalaga; Luca Fanelli; Andoni García
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We show that global Strichartz estimates for magnetic Dirac operators generally fails, if the potentials do not decay fast enough at in?nity. In order to prove this, we construct some explicit examples of homogeneous magnetic potentials with less than Coulomb decay, i. e. with homogeneity-degree more than -1, such that the magnetic ?field points to a ?fixed direction, which does not depend on $x\in \mathbb{R}^3$.
Source: http://arxiv.org/abs/1107.0843v1
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by Alexander Gnedin
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In the famous Three-Door-Game Monte cannot help to win all the time by signaling location of the prize, using only the freedom he allowed to use. No matter which strategies played, there is always at least one door where the prize will not be found. However, already in the game with four doors cooperative Monte can reveal two useless doors in sequence (leaving two doors unrevealed), to inform Conie about location of the prize, so enabling her to beat the only-switching strategies and win all...
Source: http://arxiv.org/abs/1107.0848v1
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by Nipuni Palliyaguru; Maura McLaughlin; Evan Keane; Michael Kramer; Andrew Lyne; Duncan Lorimer; R. N. Manchester; Fernando Camilo; Ingrid Stairs
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We have analysed the long- and short-term time dependence of the pulse arrival times and the pulse detection rates for eight Rotating Radio Transient (RRAT) sources from the Parkes Multi-beam Pulsar Survey (PMPS). We find significant periodicities in the individual pulse arrival times from six RRATs. These periodicities range from 30 minutes to 2100 days and from one to 16 independent (i.e. non-harmonically related) periodicities are detected for each RRAT. In addition, we find that pulse...
Source: http://arxiv.org/abs/1107.0991v1
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by M. Libanov; V. Rubakov
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We discuss two versions of the conformal scenario for generating scalar cosmological perturbations: a spectator version with a scalar field conformally coupled to gravity and carrying negligible energy density, and a dynamical version with a scalar field minimally coupled to gravity and dominating the cosmological evolution. By making use of the Newtonian gauge, we show that (i) no UV strong coupling scale is generated below $M_{Pl}$ due to mixing with metric perturbations in the dynamical...
Source: http://arxiv.org/abs/1107.1036v1
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by M. D. Lehnert; C. Tasse; N. P. H. Nesvadba; P. N. Best; W. van Driel
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(abridged) We have analyzed the properties of the Na D doublet lines in a large sample of 691 radio galaxies using the Sloan Digital Sky Survey (SDSS). These radio galaxies are resolved in the FIRST survey, have redshifts less that 0.2 and radio flux densities at 1.4 GHz higher than 40 mJy. Approximately 1/3 of the sources show a significant excess (above that contributed by their stellar populations) of Na D absorption that can be robustly fitted with two Voigt profiles representing the Na D...
Source: http://arxiv.org/abs/1107.1037v1
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by Mark Shattuck; Tamás Waldhauser
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We give combinatorial proofs for some identities involving binomial sums that have no closed form.
Source: http://arxiv.org/abs/1107.1063v1
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by Guillaume Tomasini
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The aim of this article is to find all weight modules of degree 1 of a simple complex Lie algebra that integrate to a continuous representation of a simply-connected real Lie group on some Hilbert space.
Source: http://arxiv.org/abs/1107.1136v1
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by Tiziana Di Matteo; Nishikanta Khandai; Colin DeGraf; Yu Feng; Rupert Croft; Julio Lopez; Volker Springel
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Observations of the most distant bright quasars imply that billion solar mass supermassive black holes (SMBH) have to be assembled within the first eight hundred million years. Under our standard galaxy formation scenario such fast growth implies large gas densities providing sustained accretion at critical or supercritical rates onto an initial black hole seed. It has been a long standing question whether and how such high black hole accretion rates can be achieved and sustained at the centers...
Source: http://arxiv.org/abs/1107.1253v1
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by S. Sumangala Rao; Gajendra Pandey; David L. Lambert; Sunetra Giridhar
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We have conducted an LTE abundance analysis for SAO 40039 a warm post-AGB star whose spectrum is known to show surprisingly strong He I lines for its effective temperature and has been suspected of being H-deficient and He-rich. High-resolution optical spectra are analyzed using a family of model atmospheres with different He/H ratios. Atmospheric parameters are estimated from the ionization equilibrium set by neutral and singly ionized species of Fe and Mg, the excitation of Fe I and Fe II...
Source: http://arxiv.org/abs/1107.1316v1
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by B. K. Sahoo; B. P. Das
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We consider parity nonconservation (PNC) in singly ionized ytterbium (Yb+) arising from the neutral current weak interaction. We calculate the PNC electric dipole transition amplitude (E1_PNC) and the properties associated with it using the relativistic coupled-cluster theory. E1_PNC for the [4f^{14}] ^2 6s --> [4f^{14}] ^2 5d_{3/2} transition in Yb+ has been evaluated to within an accuracy of 5%. The improvement of this result is possible. It therefore appears that this ion is a promising...
Source: http://arxiv.org/abs/1107.1288v1
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by Andrea Andrisani; Nicola Cufaro Petroni
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Starting from the forward and backward infinitesimal generators of bilateral, time-homogeneous Markov processes, the self-adjoint Hamiltonians of the generalized Schroedinger equations are first introduced by means of suitable Doob transformations. Then, by broadening with the aid of the Dirichlet forms the results of the Nelson stochastic mechanics, we prove that it is possible to associate bilateral, and time-homogeneous Markov processes to the wave functions stationary solutions of our...
Source: http://arxiv.org/abs/1107.1337v3
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by Ying Tang; Anders W. Sandvik
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We develop a technique to directly study spinons (emergent spin S = 1/2 particles) in quantum spin models in any number of dimensions. The size of a spinon wave packet and of a bound pair (a triplon) are defined in terms of wave-function overlaps that can be evaluated by quantum Monte Carlo simulations. We show that the same information is contained in the spin-spin correlation function as well. We illustrate the method in one dimension. We confirm that spinons are well defined particles (have...
Source: http://arxiv.org/abs/1107.1439v2
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by Chun Liu
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After reviewing electroweak (EW) scale supersymmetry (susy) and split susy, as well as their implications in very high energy cosmic rays, I present a high scale susy model for fermion masses. An O(0.1) nu_e-nu_{tau} mixing is expected.
Source: http://arxiv.org/abs/1107.1460v1
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by Adrian Carmona; Eduardo Ponton; Jose Santiago
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We study the effect of bulk fermions on electroweak precision observables in a recently proposed model with warped extra dimensions and no custodial symmetry. We find that the top-quark mass, together with the corrections to the Zbb vertex and the one-loop contribution to the T parameter, which is finite, impose important constraints that single out a well defined region of parameter space. New massive vector bosons can be as light as 1.5 TeV and have large couplings to the t_R quark, and...
Source: http://arxiv.org/abs/1107.1500v2
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by Edwin J. Son; Wontae Kim
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We fermionize the two-dimensional free Lifshitz scalar field in order to identify what the gauge covariant couplings are, and then they are bosonized back to get the gauged Lifshitz scalar field theories. We show that they give the same physical modes with those of the corresponding Lorentz invariant gauged scalar theories, although the dispersion relations are different.
Source: http://arxiv.org/abs/1107.1582v2
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by A. S. Garkun; V. I. Kudin; A. V. Minkevich; Yu. G. Vasilevsky
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Homogeneous isotropic models with two torsion functions built in the framework of the Poincare gauge theory of gravity based on general expression of gravitational Lagrangian by certain restrictions on indefinite parameters are analyzed numerically. Special points of cosmological solutions at asymptotics and conditions of their stability in dependence of indefinite parameters are found. Procedure of numerical integration of the system of gravitational equations at asymptotics is considered....
Source: http://arxiv.org/abs/1107.1566v1
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by Jigger Cheh; Hong Zhao
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In this letter we study thermal conduction in mass-graded graphene flakes by nonequilibrium molecular dynamics simulations. It is found that mass-graded graphene flakes reveal no thermal rectification effect in thermal conduction process. The dependence of thermal conductivity upon the heat flux and the mass gradient are studied to confirm the generality of the result.The mechanism leading to the absence of thermal rectification effect is also discussed.
Source: http://arxiv.org/abs/1107.1578v3
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We propose a class of random scale-free spatial networks with nested community structures and analyze Reed-Frost epidemics with community related independent transmissions. We show that the epidemic threshold may be trivial or not depending on the relation among community sizes, distribution of the number of communities and transmission rates
Source: http://arxiv.org/abs/1107.1532v1
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We analyze and improve low rank representation (LRR), the state-of-the-art algorithm for subspace segmentation of data. We prove that for the noiseless case, the optimization model of LRR has a unique solution, which is the shape interaction matrix (SIM) of the data matrix. So in essence LRR is equivalent to factorization methods. We also prove that the minimum value of the optimization model of LRR is equal to the rank of the data matrix. For the noisy case, we show that LRR can be...
Source: http://arxiv.org/abs/1107.1561v1
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by Stephan Baier; Liangyi Zhao
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In this paper, we study the average of the Fourier coefficients of a holomorphic cusp form for the full modular group at primes of the form $[g(n)]$.
Source: http://arxiv.org/abs/1107.1572v1
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by A. Yu. Khrennikov; A. V. Kosyak; V. M. Shelkovich
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This paper is devoted to wavelet analysis on adele ring $\bA$ and the theory of pseudo-differential operators. We develop the technique which gives the possibility to generalize finite-dimensional results of wavelet analysis to the case of adeles $\bA$ by using infinite tensor products of Hilbert spaces. The adele ring is roughly speaking a subring of the direct product of all possible ($p$-adic and Archimedean) completions $\bQ_p$ of the field of rational numbers $\bQ$ with some conditions at...
Source: http://arxiv.org/abs/1107.1700v1
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A model is presented to estimate the fraction of Supernova Type-II events (SNII) occurring inside vs. outside a spiral arm for a given star formation episode. The probability distribution function (PDF) for this fraction is given for use in models similar to those of Shaviv et al. [13][11]. The calculated PDF for the SNII fraction, SNII_{in/total}, defined as the number of SNII inside a spiral arm divided by the total number of SNII from a star formation event, provides a constraint on the...
Source: http://arxiv.org/abs/1107.1696v1
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by Thomas K. Gaisser
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IceCube as a three-dimensional air-shower array covers an energy range of the cosmic-ray spectrum from below 1 PeV to approximately 1 EeV. This talk is a brief review of the function and goals of IceTop, the surface component of the IceCube neutrino telescope. An overview of different and complementary ways that IceCube is sensitive to the primary cosmic-ray composition up to the EeV range is presented. Plans to obtain composition information in the threshold region of the detector in order to...
Source: http://arxiv.org/abs/1107.1690v2
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by Landon Rabern
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We prove a general lemma about partitioning the vertex set of a graph into subgraphs of bounded degree. This lemma extends a sequence of results of Lov\'asz, Catlin, Kostochka and Rabern.
Source: http://arxiv.org/abs/1107.1735v1
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by Matthew D. Johnston; David Siegel; Gábor Szederkényi
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A numerically effective procedure for determining weakly reversible chemical reaction networks that are linearly conjugate to a known reaction network is proposed in this paper. The method is based on translating the structural and algebraic characteristics of weak reversibility to logical statements and solving the obtained set of linear (in)equalities in the framework of mixed integer linear programming. The unknowns in the problem are the reaction rate coefficients and the parameters of the...
Source: http://arxiv.org/abs/1107.1659v1
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by Nina Tetzlaff; Thomas Eisenbeiss; Ralph Neuhaeuser; Markus Matthias Hohle
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RXJ1856 and RXJ0720 are the only young isolated radio-quiet neutron stars (NSs) for which trigonometric parallaxes were measured. Due to detection of their thermal emission in X-rays they are important to study NS cooling and to probe theoretical cooling models. Hence, a precise determination of their age is essential. Recently, new parallax measurements of RXJ1856 and RXJ0720 were obtained. Considering that NSs may originate from binary systems that got disrupted due to an asymmetric...
Source: http://arxiv.org/abs/1107.1673v1
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by Marko Lovrić; Philipp Glasenapp; Dieter Suter; Biagio Tumino; Alban Ferrier; Philippe Goldner; Mahmood Sabooni; Lars Rippe; Stefan Kröll
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Rare-earth ions in dielectric crystals are interesting candidates for storing quantum states of photons. A limiting factor on the optical density and thus the conversion efficiency is the distortion introduced in the crystal by doping elements of one type into a crystal matrix of another type. Here, we investigate the system Pr3+:La2(WO4)3, where the similarity of the ionic radii of Pr and La minimizes distortions due to doping. We characterize the praseodymium hyperfine interaction of the...
Source: http://arxiv.org/abs/1107.2274v1
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Modelling of adiabatic gravity wave propagation in the solar atmosphere showed that mode conversion to field guided acoustic waves or Alfv\'en waves was possible in the presence of highly inclined magnetic fields. This work aims to extend the previous adiabatic study, exploring the consequences of radiative damping on the propagation and mode conversion of gravity waves in the solar atmosphere. We model gravity waves in a VAL-C atmosphere, subject to a uniform, and arbitrarily orientated...
Source: http://arxiv.org/abs/1107.2208v1