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Oct 13, 2017
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Oct 13, 2017
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Ekhtiar, Maryam D. and Claire Moore, ed.
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Lost Landscapes of San Francisco 6 (2011) is the latest in a series of historical urban explorations, made from home movies, industrial and promotional films and outtakes, and other cinematic ephemera. It sold out the Castro Theatre in December, and this will be its second screening. YOU are the soundtrack. Please come prepared to shout out your identifications, ask questions about what’s on the screen, and share your thoughts with fellow audience members. Most of the footage in this program...
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Topics: Rick Prelinger, San Francisco, Internet Archive, Brewster Kahle, Archival movies
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Andreas Schäfer; Jian Zhou
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We reexamine the scale dependence of the ETQS (EfremovTeryaevQiuSterman) twist3 matrix element which has been studied already by the four different groups with conflicting results Ref.[14]. We find that we can in fact reproduce the results of Ref.[4] with the method Ref.[4] when we treat some subtleties with greater care, thus easing the mentioned conflict.
Source: http://arxiv.org/abs/1203.5293v1
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V. Topor Pop; M. Gyulassy; J. Barrette; C. Gale; A. Warburton
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We use the framework of the HIJING/B\=B v2.0 model to simulate highmultiplicity (HM) $p+p$ collision events at the Large Hadron Collider (LHC) to study observables sensitive to possible collective phenomena, such as strong longitudinal color fields (SLCF) modeled by an enhanced string tension ($\kappa$). We focus on the hyperon/meson yield ratios at centerofmass (c.m.) energy $\sqrt{s}$ = 7 TeV, in the transverse momentum region, $1 < p_T < 4 $ GeV/{\it c}. For minimum bias events...
Source: http://arxiv.org/abs/1203.6679v2
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Andre Chatzistamatiou
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We prove the following criterion for the prorepresentability of the deformation cohomology of a commutative formal Lie group. Let f be a flat and separated morphism between noetherian schemes. Assume that the target of f is flat over the integers. For a commutative formal Lie group E, we have the deformation cohomology of f with coefficients in E at our disposal. If the higher direct images of the tangent space of E are locally free and of finite rank then the deformation cohomology is...
Source: http://arxiv.org/abs/1203.4926v3
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PierreVincent Koseleff; Daniel Pecker
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The harmonic knot $H(a,b,c)$ is parameterized as $K(t)= (T_a(t), T_b (t), T_c (t))$ where $a$, $b$ and $c$ are relatively coprime integers and $T_n$ is the degree $n$ Chebyshev polynomial of the first kind. We classify the harmonic knots $H(a,b,c)$ for $ a \le 4$. We show that the knot $H(2n1, 2n, 2n+1)$ is isotopic to $H(4,2n1, 2n+1)$ (up to mirror symmetry). We study the knots $H(5,n,n+1)$ and give a table of the simplest harmonic knots.
Source: http://arxiv.org/abs/1203.4376v1
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Luca Becchetti; Andrea Clementi; Francesco Pasquale; Giovanni Resta; Paolo Santi; Riccardo Silvestri
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Performance bounds for opportunistic networks have been derived in a number of recent papers for several key quantities, such as the expected delivery time of a unicast message, or the flooding time (a measure of how fast information spreads). However, to the best of our knowledge, none of the existing results is derived under a mobility model which is able to reproduce the power law+exponential tail dichotomy of the pairwise node intercontact time distribution which has been observed in...
Source: http://arxiv.org/abs/1107.5241v3
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Volodymyr Mazorchuk; Benjamin Steinberg
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In this paper we discuss various aspects of the problem of determining the minimal dimension of an injective linear representation of a finite semigroup over a field. We outline some general techniques and results, and apply them to numerous examples.
Source: http://arxiv.org/abs/1107.1413v3
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H. F. Chau; C. K. Li; Y. T. Poon; N. S. Sze
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Recently, Chau [Quant. Inform. & Comp. 11, 721 (2011)] showed that one can define certain metrics and pseudometrics on U(n), the group of all $n\times n$ unitary matrices, based on the arguments of the eigenvalues of the unitary matrices. More importantly, these metrics and pseudometrics have quantum information theoretical meanings. So it is instructive to study this kind of metrics and pseudometrics on U(n). Here we show that any symmetric norm on ${\mathbb R}^n$ induces a metric on...
Source: http://arxiv.org/abs/1107.1047v2
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Elbert E. M. Chia; D. Springer; Saritha K. Nair; X. Q. Zou; S. A. Cheong; C. Panagopoulos; T. Tamegai; H. Eisaki; S. Ishida; S. Uchida; A. J. Taylor; JianXin Zhu
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Using ultrafast optical techniques, we detect two types of bosons strongly coupled to electrons in the family of Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8+\delta}$ from the underdoped to overdoped regimes. The different doping dependences of the electronboson coupling strengths enables us to identify them as phonons and spin fluctuations: electronphonon coupling ($\lambda_{eph}$) peaks at optimal doping, and electronspin fluctuation coupling ($\lambda_{esf}$) decreases monotonically with doping....
Source: http://arxiv.org/abs/1107.1924v2
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Changhyun Ahn; Jinsub Paeng; Kyungsung Woo
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The internal 4form field strengths with 7dimensional indices have been constructed by de Wit and Nicolai in 1986. They are determined by the following six quantities: the 56bein of 4dimensional N=8 gauged supergravity, the Killing vectors on the round sevensphere, the covariant derivative acting on these Killing vectors, the warp factor, the field strengths with 4dimensional indices and the 7dimensional metric. In this paper, by projecting out the remaining mixed 4form field strengths...
Source: http://arxiv.org/abs/1107.0640v2
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Jason Matthews; David Sánchez; Marcus Larsson; Heiner Linke
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The response of electric devices to an applied thermal gradient has, so far, been studied almost exclusively in twoterminal devices. Here we present measurements of the response to a thermal bias of a fourterminal, quasiballistic junction with a central scattering site. We find a novel transverse thermovoltage measured across isothermal contacts. Using a multiterminal scattering model extended to the weakly nonlinear voltage regime, we show that the device's response to a thermal bias can...
Source: http://arxiv.org/abs/1107.3179v3
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Although the circular photon orbit and ISCO for the Kerr black hole remain distinct from each other and from the horizon in the extremal spin limit on a constant BoyerLindquist time slice, on a horizoncrossing slice they both coincide with the null generators of the horizon.
Source: http://arxiv.org/abs/1107.5081v2
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L. V. Bork; D. I. Kazakov; G. S. Vartanov
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In this paper we develop a supersymmetric version of unitarity cut method for form factors of operators from the chiral truncation of the the $\mathcal{N}=4$ stresstensor current supermultiplet $T^{AB}$. The relation between the superform factor with supermomentum equals to zero and the logarithmic derivative of the superamplitude with respect to the coupling constant is discussed and verified at tree and oneloop level for any MHV $n$point ($n \geq 4$) superform factor involving operators...
Source: http://arxiv.org/abs/1107.5551v3
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Friedemann Brock; Francesco Chiacchio; Anna Mercaldo
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This paper deals with weighted isoperimetric inequalities relative to cones of $\mathbb{R}^{N}$. We study the structure of measures that admit as isoperimetric sets the intersection of a cone with balls centered at the vertex of the cone. For instance, in case that the cone is the halfspace $\mathbb{R}_{+}^{N}={x \in \mathbb{R}^{N} : x_{N}>0}$ and the measure is factorized, we prove that this phenomenon occurs if and only if the measure has the form $d\mu=ax_{N}^{k}\exp(cx^{2})dx $, for...
Source: http://arxiv.org/abs/1107.5406v4
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T. K. Komatsubara
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Recent results and future prospects of the particle physics experiments with neutral and charged Kmeson (kaon) decays are reviewed. Topics include CP violation, rare decays, leptons in kaon decays, tests of CPT and quantum mechanics, radiative decays, hadrons in kaon decays, basic observables, Vus and CKM unitarity, and exotic searches. Experimental techniques developed for the kaon decay experiments are discussed.
Source: http://arxiv.org/abs/1203.6437v1
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JianFeng Li; HongTao Feng; Yu Jiang; WeiMin Sun; HongShi Zong
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We study dynamical chiral symmetry breaking (DCSB) in an effective QED$_{3}$ theory of dwave high temperature cuprate superconductors under a uniform magnetic field. At zero temperature, the external magnetic field induces a mixed state by generating vortices in the condensate of charged holons. The growing magnetic field suppresses the superfluid density and thus reduces the gauge field mass which is opened via the AndersonHiggs mechanism. By numerically solving the DysonSchwinger gap...
Source: http://arxiv.org/abs/1203.6423v1
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We consider generalized chameleon models where the conformal coupling between matter and gravitational geometries is not only a function of the chameleon field \phi, but also of its derivatives via higher order coordinate invariants. Specifically we consider the first such nontrivial conformal factor A(\phi,X), where X is the canonical kinetic term for \phi. The associated phenomenology is investigated and we show that such theories have a new generic massaltering mechanism, potentially...
Source: http://arxiv.org/abs/1203.6639v1
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Vassili Kolokoltsov; Wei Yang
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This paper has a twofolded purpose. First, we attempt to outline the development of the turnpike theorems in the the last several decades. Second, we study turnpike theorems in finitehorizon twoperson zerosum Markov games on a general Borel state space. Utilising the Bellman (or Shapley) operator defined for this game, we prove the stochastic versions of the early turnpike theorem on the set of optimal strategies and the middle turnpike theorem on the distribution of the state space.
Source: http://arxiv.org/abs/1203.6553v1
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Morgan W. Mitchell; Marco Koschorreck; Marcin Kubasik; Mario Napolitano; Robert J. Sewell
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An extensive debate on quantum nondemolition (QND) measurement, reviewed in Grangier et al. [Nature, {\bf 396}, 537 (1998)], finds that true QND measurements must have both nonclassical statepreparation capability and nonclassical informationdamage tradeoff. Existing figures of merit for these nonclassicality criteria require direct measurement of the signal variable and are thus difficult to apply to opticallyprobed material systems. Here we describe a method to demonstrate both...
Source: http://arxiv.org/abs/1203.6584v1
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Yannick Chevalier; Mounira Kourjieh
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We present in this paper a new procedure to saturate a set of clauses with respect to a wellfounded ordering on ground atoms such that A < B implies Var(A) {\subseteq} Var(B) for every atoms A and B. This condition is satisfied by any atom ordering compatible with a lexicographic, recursive, or multiset path ordering on terms. Our saturation procedure is based on a priori ordered resolution and its main novelty is the onthefly construction of a finite complexity atom ordering. In contrast...
Source: http://arxiv.org/abs/1203.2809v1
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Vassilios Gregoriades
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We present the effective version of the theorem about turning Borel sets in Polish spaces into clopen sets while preserving the Borel structure of the underlying space. We show that under some conditions the emerging parameters can be chosen in a hyperarithmetical way and using this we prove a uniformity result.
Source: http://arxiv.org/abs/1203.6874v1
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We present the results of a search for pair production of scalar bottom quarks ($\tilde b_1$) and scalar thirdgeneration leptoquarks ($LQ_3$) in a data sample of 5.2 $fb^{1}$ collected by the D0 experiment at the Tevatron, the $p\bar{p}$ collider at Fermilab. We assume that sbottoms decay to a neutralino ($\tilde \chi^0_1$) and a b quark, and we set 95% C.L. lower limits on their production in the ($m_{\tilde b_1}$, $m_{\tilde \chi^0_1}$) mass plane such that $m_{\tilde b_1} > 247$ GeV for...
Source: http://arxiv.org/abs/1203.6800v1
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Mohsen Sardari; Ahmad Beirami; Faramarz Fekri
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Recently, the existence of considerable amount of redundancy in the Internet traffic has stimulated the deployment of several redundancy elimination techniques within the network. These techniques are often based on either packetlevel Redundancy Elimination (RE) or ContentCentric Networking (CCN). However, these techniques cannot exploit subpacket redundancies. Further, other alternative techniques such as the endtoend universal compression solutions would not perform well either over the...
Source: http://arxiv.org/abs/1203.6864v1
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Jesper Levinsen; Pietro Massignan; Frédéric Chevy; Carlos Lobo
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We consider the properties of a single impurity immersed in a Fermi sea close to an interspecies pwave Feshbach resonance. We calculate its dispersion and spectral response to a radiofrequency pulse. In the presence of a magnetic field, dipolar interactions split the resonance and lead to the appearance of two novel features with respect to the swave case: a third polaron branch in the excitation spectrum, in addition to the usual attractive and repulsive ones; and an anisotropic dispersion...
Source: http://arxiv.org/abs/1203.6881v1
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Ayfer Ozgur; Suhas Diggavi
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Recently, it has been shown that a quantizemapandforward scheme approximately achieves (within a constant number of bits) the Gaussian relay network capacity for arbitrary topologies. This was established using Gaussian codebooks for transmission and random mappings at the relays. In this paper, we show that the same approximation result can be established by using lattices for transmission and quantization along with structured mappings at the relays.
Source: http://arxiv.org/abs/1005.1284v2
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Mehdi Talamali; Viljo Petäjä; Damien Vandembroucq; Stéphane Roux
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A mesoscopic model for shear plasticity of amorphous materials in two dimensions is introduced, and studied through numerical simulations in order to elucidate the macroscopic (large scale) mechanical behavior. Plastic deformation is assumed to occur through a series of local reorganizations. Using a discretization of the mechanical fields on a discrete lattice, local reorganizations are modeled as local slip events. Local yield stresses are randomly distributed in space and invariant in time....
Source: http://arxiv.org/abs/1005.2463v3
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A. Hill; A. Sinner; K. Ziegler
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We calculate the optical Hall conductivity within the Kubo formalism for systems with gapped spectral nodes, where the latter have a powerlaw dispersion with exponent n. The optical conductivity is proportional to n and there is a characteristic logarithmic singularity as the frequency approaches the gap energy. The optical Hall conductivity is almost unaffected by thermal fluctuations and disorder for n=1, whereas disorder has a stronger effect on transport properties if n=2.
Source: http://arxiv.org/abs/1005.3211v3
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For a semiabelian variety over a global function field which is isogenous to an isotrivial one, we show that on the product of local points of a subvariety satisfying a minor condition, the topological closure of a finitely generated subgroup of %the group of its global points cuts out exactly the global points of the subvariety lying in this subgroup. As a corollary, on every nonisotrivial supersingular curve of genus two over a global function field, we conclude that the BrauerManin...
Source: http://arxiv.org/abs/1005.4998v3
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Mark Adler; Eric Nordenstam; Pierre van Moerbeke
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In 1962, Dyson introduced dynamics in random matrix models, in particular into GUE (also for beta=1 and 4), by letting the entries evolve according to independent OrnsteinUhlenbeck processes. Dyson shows the spectral points of the matrix evolve according to nonintersecting Brownian motions. The present paper shows that the interlacing spectra of two consecutive principal minors form a Markov process (diffusion) as well. This diffusion consists of two sets of Dyson nonintersecting Brownian...
Source: http://arxiv.org/abs/1007.0220v3
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We study some properties of the Venereau polynomials b_m=y+x^m(xz+y(yu+z^2)), a sequence of proposed counterexamples to the AbhyankarSathaye embedding conjecture and the DolgachevWeisfeiler conjecture. It is well known that these are hyperplanes and residual coordinates, and for m at least 3, they are C[x]coordinates. For m=1,2, it is only known that they are 1stable C[x]coordinates. We show that b_2 is in fact a C[x]coordinate. We introduce the notion of Venereautype polynomials, and...
Source: http://arxiv.org/abs/1007.2230v3
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I present a brief review on space and time in different periods of physics, and then talk on the nature of space and time from physical arguments. I discuss the ways to test such a new perspective on space and time through searching for Lorentz violation in some physical processes. I also make an introduce to a newly proposed theory of Lorentz violation from basic considerations.
Source: http://arxiv.org/abs/1203.5852v2
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A. V. Geramita; B. Harbourne; J. Migliore
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Star configurations are certain unions of linear subspaces of projective space. They have appeared in several different contexts: the study of extremal Hilbert functions for fat point schemes in the plane; the study of secant varieties of some classical algebraic varieties; the study of the resurgence of projective schemes. In this paper we study some algebraic properties of the ideals defining star configurations, including getting partial results about Hilbert functions, generators and...
Source: http://arxiv.org/abs/1203.5685v1
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Mancho Manev; Miroslava Ivanova
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The canonicaltype connection on the almost contact manifolds with Bmetric is constructed. It is proved that its torsion is invariant with respect to a subgroup of the general conformal transformations of the almost contact Bmetric structure. The basic classes of the considered manifolds are characterized in terms of the torsion of the canonicaltype connection.
Source: http://arxiv.org/abs/1203.0137v3
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Gunnar Wilken; Andreas Weiermann
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Let T be Goedel's system of primitive recursive functionals of finite type in the lambda formulation. We define by constructive means using recursion on nested multisets a multivalued function I from the set of terms of T into the set of natural numbers such that if a term a reduces to a term b and if a natural number I(a) is assigned to a then a natural number I(b) can be assigned to b such that I(a) is greater than I(b). The construction of I is based on Howard's 1970 ordinal assignment for T...
Source: http://arxiv.org/abs/1203.0115v2
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S. Quaglioni; P. Navratil; R. Roth; W. Horiuchi
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Nuclei are prototypes of manybody open quantum systems. Complex aggregates of protons and neutrons that interact through forces arising from quantum chromodynamics, nuclei exhibit both bound and unbound states, which can be strongly coupled. In this respect, one of the major challenges for computational nuclear physics, is to provide a unified description of structural and reaction properties of nuclei that is based on the fundamental underlying physics: the constituent nucleons and the...
Source: http://arxiv.org/abs/1203.0268v1
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Fernando Micena; Ali Tahzibi
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In this work we study relations between regularity of invariant foliations and Lyapunov exponents of partially hyperbolic diffeomorphisms. We suggest a new regularity condition for foliations in terms of desintegration of Lebesgue measure which can be considered as a criterium for rigidity of Lyapunov exponents.
Source: http://arxiv.org/abs/1203.0142v1
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Ai Min Chen; Sam Young Cho; Mun Dae Kim
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Singlestep implementations of multiqubit gates are generally believed to provide a simpler design, a faster operation, and a lower decoherence. For coupled three qubits interacting with a photon field, a realizable scheme for a singlestep Toffoli gate is investigated. We find that the three qubit system can be described by four effective modified JaynesCummings models in the states of two control qubits. Within the rotating wave approximation, the modified JaynesCummings models are shown...
Source: http://arxiv.org/abs/1203.0374v1
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Fiorentino; G.; Clementini; Marconi; M.; Musella; I.; Saha; A.; Tosi; Contreras Ramos; R.; Annibali; F.; Aloisi; van der Marel; R
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The cosmological distance ladder crucially depends on classical Cepheids (with P=380 days), which are primary distance indicators up to 33 Mpc. Within this volume, very few SNe Ia have been calibrated through classical Cepheids, with uncertainty related to the nonlinearity and the metallicity dependence of their periodluminosity (PL) relation. Although a general consensus on these effects is still not achieved, classical Cepheids remain the most used primary distance indicators. A possible...
Source: http://arxiv.org/abs/1203.0026v1
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Eleonora Nagali; Vincenzo D'Ambrosio; Fabio Sciarrino; Adan Cabello
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Quantum resources outperform classical ones for certain communication and computational tasks. Remarkably, in some cases, the quantum advantage cannot be improved using hypothetical postquantum resources. A class of tasks with this property can be singled out using graph theory. Here we report the experimental observation of an impossibletobeat quantum advantage on a fourdimensional quantum system defined by the polarization and orbital angular momentum of a single photon. The results show...
Source: http://arxiv.org/abs/1203.0980v1
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Li Gang; Wang ShuangTe; Song Mao; Lin JiPing
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In this work, we investigate the associated production of prompt heavy quarkonium with a massive (anti)bottom quark to leading order in the NRQCD factorization formalism at the LHC. We present numerical results for the processes involving $J/\psi,\chi_{cJ},\Upsilon$ and $\chi_{bJ}$. From our work, we find that the production rates of these processes are quite large, and these processes have the potential to be detected at the LHC. When $p_T$ is smaller than about 10 GeV, the $c\bar{c} [...
Source: http://arxiv.org/abs/1203.0799v2
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David Shilane; Derek Bean
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The Negative Binomial distribution becomes highly skewed under extreme dispersion. Even at moderately large sample sizes, the sample mean exhibits a heavy right tail. The standard Normal approximation often does not provide adequate inferences about the data's mean in this setting. In previous work, we have examined alternative methods of generating confidence intervals for the expected value. These methods were based upon Gamma and Chi Square approximations or tail probability bounds such as...
Source: http://arxiv.org/abs/1203.0813v1
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V. N. Velizhanin
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We calculate the threeloop anomalous dimension of the nonsinglet transverse operator from N=1 to N=15. Using some guess we have reconstructed a general form of threeloop anomalous dimension for arbitrary Mellin moment N. Obtained result is transformed into Bjorkenx space by an inverse Mellin transformation. The final expressions are presented in both MellinN and Bjorkenx space.
Source: http://arxiv.org/abs/1203.1022v2
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Diego Correa; Johannes Henn; Juan Maldacena; Amit Sever
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We derive an analytic formula at three loops for the cusp anomalous dimension Gamma_cusp(phi) in N=4 super YangMills. This is done by exploiting the relation of the latter to the Regge limit of massive amplitudes. We comment on the corresponding three loops quark antiquark potential. Our result also determines a considerable part of the threeloop cusp anomalous dimension in QCD. Finally, we consider a limit in which only ladder diagrams contribute to physical observables. In that limit, a...
Source: http://arxiv.org/abs/1203.1019v2
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We study the linear perturbation of the recently proposed model of inflation where a uniform gaugekinetic coupling of the inflaton to multiple vector fields breaks the cosmic nohair conjecture while maintaining the isotropy. We derive the general quadratic action for the perturbation and calculate the power spectra of scalar and tensor modes at the end of inflation by inin formalism. It is shown that the model predicts slightly red spectra and the tensortoscalar ratio tends to be...
Source: http://arxiv.org/abs/1203.1071v3
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We argue that the general symmetrybreaking pattern in (quasi)conventional (parity and timereversal symmetric singleband spinsinglet) superconductivity is given by U(1)_V x U(1)_A > U(1)_A, where V stands for vector and A stands for axialvector, as opposed to the breaking of U(1)_V\equiv U(1)_ele/mag by itself as is commonly thought. This symmetrybreaking pattern implies that there will be a Higgs mode which, together with the Goldstone boson that is absorbed by the photon (Meissner...
Source: http://arxiv.org/abs/1203.1438v2
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Tomohiro Hayashi
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This is a continuation of our previous paper. We consider a certain orderlike relation for positive operators on a Hilbert space. This relation is defined by using the Jensen inequality with respect to the squareroot function. We show that this relation is antisymmetric if the operators are invertible.
Source: http://arxiv.org/abs/1203.1154v1
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Ridha Horchani; Hans Lignier; Nadia BouloufaMaafa; Andrea Fioretti; Pierre Pillet; Daniel Comparat
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We demonstrate the conversion of cold Cs_{2} molecules initially distributed over several vibrational levels of the lowest triplet state a^{3}\Sigma_{u}^{+} into the singlet ground state X^{1}\Sigma_{g}^{+}. This conversion is realized by a broadband laser exciting the molecules to a wellchosen state from which they may decay to the singlet state throug\textcolor{black}{h two sequential singlephoton emission steps: Th}e first photon populates levels with mixed tripletsinglet character,...
Source: http://arxiv.org/abs/1203.1431v1
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We study possibility of phase transitions between Lifshitz black holes and other configurations by using free energies explicitly. A phase transition between Lifshitz soliton and Lifshitz black hole might not occur in three dimensions. We find that a phase transition between Lifshitz and BTZ black holes unlikely occurs because they have different asymptotes. Similarly, we point out that any phase transition between Lifshitz and black branes unlikely occurs in four dimensions since they have...
Source: http://arxiv.org/abs/1203.1367v3
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The World Wide Web currently evolves into a Web of Linked Data where content providers publish and link data as they have done with hypertext for the last 20 years. While the declarative query language SPARQL is the de facto for querying apriory defined sets of data from the Web, no language exists for querying the Web of Linked Data itself. However, it seems natural to ask whether SPARQL is also suitable for such a purpose. In this paper we formally investigate the applicability of SPARQL as...
Source: http://arxiv.org/abs/1203.1569v2
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J. Nipper; J. B. Balewski; A. T. Krupp; S. Hofferberth; R. Löw; T. Pfau
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We present experiments measuring an interaction induced phase shift of Rydberg atoms at Stark tuned F\"orster resonances. The phase shift features a dispersive shape around the resonance, showing that the interaction strength and sign can be tuned coherently. We use a pair state interferometer to measure the phase shift. Although the coupling between pair states is coherent on the time scale of the experiment, a loss of visibility occurs as a pair state interferometer involves three...
Source: http://arxiv.org/abs/1203.1851v1
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Manfred Requardt
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We complement investigations of the gauge structure of general relativity with an analysis of the physical consequences of the spontaneous breaking of diffeomorphism invariance which manifests itself in e.g. the socalled Einstein hole problem. We analyze the nature of the gravitons as Goldstone excitations both in the classical and the quantum case. We show that the metrical field and the classical spacetime manifold play the role of an order parameter field and order parameter manifold as...
Source: http://arxiv.org/abs/1203.1702v1
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Carl M. Bender; Sarben Sarkar
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This paper presents an asymptotic analysis of the Boltzmann equations (Riccati differential equations) that describe the physics of thermal darkmatterrelic abundances. Two different asymptotic techniques are used, boundarylayer theory, which makes use of asymptotic matching, and the delta expansion, which is a powerful technique for solving nonlinear differential equations. Two different Boltzmann equations are considered. The first is derived from general relativistic considerations and the...
Source: http://arxiv.org/abs/1203.1822v1
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Considering the model of a scalar massive Fermion, it is shown that by means of deformation techniques it is possible to obtain all integrable quantum field theoretic models on twodimensional Minkowski space which have factorizing Smatrices corresponding to twoparticle scattering functions S_2 satisfying S_2(0) = 1. Among these models there is for example the SinhGordon model. Our analysis provides a complement to recent developments regarding deformations of quantum field theories. The...
Source: http://arxiv.org/abs/1203.2058v1
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Jim Geelen; Peter Nelson
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For a set $G$ of points in $\PG(m1,q)$, let $\ex_q(G;n)$, denote the maximum size of a collection of points in $\PG(n1,q)$ not containing a copy of $G$, up to projective equivalence. We show that \[\lim_{n\rightarrow \infty} \frac{\ex_q(G;n)}{\PG(n1,q)} = 1q^{1c},\] where $c$ is the smallest integer such that there is a rank$(mc)$ flat in $\PG(m1,q)$ that is disjoint from $G$. The result is an elementary application of the density version of the HalesJewett Theorem.
Source: http://arxiv.org/abs/1203.1911v1
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Some of supersymmetric ChernSimons theories are known to exhibit supersymmetry breaking when the ChernSimons level is less than a certain number. The mechanism of the supersymmetry breaking is, however, not clear from the field theory viewpoint. In this paper, we discuss vacuum states of ${\cal N}=2$ pure ChernSimons theory and ${\cal N}=2$ ChernSimonsmatter theories of quiver type using related theories in which ChernSimons terms are replaced with (anti)fundamental chiral multiplets. In...
Source: http://arxiv.org/abs/1203.2039v2
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Pure glass is defined as a thermodynamic phase in which typical equilibrium particle configurations have macroscopic overlaps with one of some special irregular configurations. By employing 128types of artificial molecules, a pure glass model is constructed in the cubic lattice. It is demonstrated that onestep replica symmetry breaking occurs in the model.
Source: http://arxiv.org/abs/1203.2406v3
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Maxim Makatchev; Reid Simmons; Majd Sakr
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We present the first annotated corpus of nonverbal behaviors in receptionist interactions, and the first nonverbal corpus (excluding the original video and audio data) of service encounters freely available online. Native speakers of American English and Arabic participated in a naturalistic role play at reception desks of university buildings in Doha, Qatar and Pittsburgh, USA. Their manually annotated nonverbal behaviors include gaze direction, hand and head gestures, torso positions, and...
Source: http://arxiv.org/abs/1203.2299v1
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Christian Hainzl; Benjamin Schlein
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We show that the timeevolution of the wave function describing the macroscopic variations of the pair density in BCS theory can be approximated, in the dilute limit, by a timedependent GrossPitaevskii equation.
Source: http://arxiv.org/abs/1203.2811v1
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In the minisuperspace approximation to cosmology, the canonical measure can be used to compute probabilities when a cutoff is introduced in the phase space to regularize the divergent measure. However, the region initially constrained by a simple cutoff evolves nontrivially under the Hamiltonian flow. We determine the deformation of the regularized phase space along the orbits when a cutoff is introduced for the scale factor of the universe or for the Hubble parameter. In the former case, we...
Source: http://arxiv.org/abs/1203.2807v2
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Laura Foini; Florent Krzakala; Francesco Zamponi
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In this paper we revisit and extend the mapping between two apparently different classes of models. The first class contains the prototypical models described at the meanfield level by the Random First Order Transition (RFOT) theory of the glass transition, called either "random XORSAT problem" (in the information theory community) or "diluted $p$spin model" (in the spin glass community), undergoing a singlespin flip Glauber dynamics. The models in the second class...
Source: http://arxiv.org/abs/1203.3166v2
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Silvia Lorenzani
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We provide a comment on "Velocity slip coefficients based on the hardsphere Boltzmann equation" by Livio Gibelli published in Phys. Fluids 24, 022001 (2012).
Source: http://arxiv.org/abs/1203.3021v2
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Quillen showed that simplicial sets form a model category (with appropriate choices of three classes of morphisms), which organized the homotopy theory of simplicial sets. His proof is very difficult and uses even the classification theory of principal bundles. Thus, GoerssJardine appealed to topological methods for the verification. In this paper we give a new proof of this organizing theorem of simplicial homotopy theory which is elementary in the sense that it does not use the classifying...
Source: http://arxiv.org/abs/1203.3004v2
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Shinji Motok; i Yoshiyuki Nakagawa; Keitaro Nagata; Koichi Hashimoto; Kiyoshi Mizumaru; Atsushi Nakamura
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We report an implementation of a code for SU(3) matrix multiplication on Cell/B.E., which is a part of our project, Lattice Tool Kit on Cell/B.E.. On QS20, the speed of the matrix multiplication on SPE in single precision is 227GFLOPS and it becomes 20GFLOPS {this vaule was remeasured and corrcted.} together with data transfer from main memory by DNA transfer, which is 4.6% of the hardware peak speed (460GFLOPS), and is 7.4% of the theoretical peak speed of this calculation (268.77GFLOPS). We...
Source: http://arxiv.org/abs/1203.3339v1
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Juan García Escudero
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A construction of algebraic surfaces based on two types of simple arrangements of lines, containing the prototiles of substitution tilings, has been proposed recently. The surfaces are derived with the help of polynomials obtained from products of the lines generating the simple arrangements. One of the arrangements gives the generalizations of the Chebyshev polynomials known as folding polynomials. The other produces a family of polynomials having more critical points with the same critical...
Source: http://arxiv.org/abs/1203.3691v2
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Erik Lindgren; Peter Lindqvist
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We study a nonlocal eigenvalue problem related to the fractional Sobolev spaces for large values of p and derive the limit equation as p goes to infinity. Its viscosity solutions have many interesting properties and the eigenvalues exhibit a strange behaviour. Keywords: eigenvalue, nonlocal equation, nonlinear equation
Source: http://arxiv.org/abs/1203.4130v2
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A procedure that generates parallelograms from any quadrilateral is presented. If the original quadrilateral is itself a parallelogram, then the procedure gives squares. Hence, when applied two times, this procedure generates squares from any quadrilateral. The proof needs only undergraduate level.
Source: http://arxiv.org/abs/1203.4167v1
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Riccardo Barbieri; Dario Buttazzo; Filippo Sala; David M. Straub
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The quark sector of the Standard Model exhibits an approximate U(2)^3 flavour symmetry. This symmetry, broken in specific directions dictated by minimality, can explain the success of the CabibboKobayashiMaskawa picture of flavour mixing and CP violation, confirmed by the data so far, while allowing for observable deviations from it, as expected in most models of ElectroWeak Symmetry Breaking. Building on previous work in the specific context of supersymmetry, we analyze the expected effects...
Source: http://arxiv.org/abs/1203.4218v1
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Anunay Kulshrestha
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We first introduce the Hamming distance between two strings. Then, we apply this concept to the representations of whole numbers in base n for all positive integers n > 2. We claim that a simple formula exists for the sum of all Hamming distances between pairs of consec utive integers from 1 to m, which we will derive. We also state and prove other interesting results concerning the aforementioned topic.
Source: http://arxiv.org/abs/1203.4547v2
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F. M. D. Pellegrino; G. G. N. Angilella; R. Pucci
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We study tunneling across a straininduced superlattice in graphene. In studying the effect of applied strain on the lowlying Diraclike spectrum, both a shift of the Dirac points in reciprocal space, and a deformation of the Dirac cones is explicitly considered. The latter corresponds to an anisotropic, possibly nonuniform, Fermi velocity. Along with the modes with unit transmission usually found across a single barrier, we analytically find additional resonant modes when considering a...
Source: http://arxiv.org/abs/1203.4368v1
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Seiichiro Onari; Hiroshi Kontani
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We study the fiveorbital Hubbard model including the charge quadrupole interaction for iron pnictides. Using the fluctuationexchange (FLEX) approximation, orbital fluctuations evolve inversely proportional to the temperature, and therefore the resistivity shows linear or convex Tdependence for wide range of temperatures. We also analyze the Eliashberg gap equation, and show that swave superconducting state without sign reversal (s++ wave state) emerges when the orbital fluctuations...
Source: http://arxiv.org/abs/1203.4639v2
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Vitaliy N. Pustovit; Tigran V. Shahbazyan
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We develop a microscopic model for fluorescence of a molecule (or semiconductor quantum dot) near a small metal nanoparticle. When a molecule is situated close to metal surface, its fluorescence is quenched due to energy transfer to the metal. We perform quantummechanical calculations of energy transfer rates for nanometersized Au nanoparticles and find that nonlocal and quantumsize effects significantly enhance dissipation in metal as compared to those predicted by semiclassical...
Source: http://arxiv.org/abs/1203.4656v2
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Adam B. Hopkins; Frank H. Stillinger; Salvatore Torquato
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Maximally random jammed states of hard spheres are prototypical glasses. We study the small wavenumber $k$ behavior of the structure factor $S(k)$ of overcompressed millionsphere packings as a function of density up to the jammed state. We find both a precursor to the glassy jammed state evident long before the jamming density is reached and an associated growing length scale, extracted from the volume integral of the direct correlation function $c(r)$, which diverges at the...
Source: http://arxiv.org/abs/1203.4589v2
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Motivated by mirror symmetry, we begin to study the limiting behavior of HermitianYangMills metrics on a class of rank two slopestable vector bundles over the product of two elliptic curves with a family of product metrics, which are flat and have areas $\epsilon$ and $\epsilon^{1}$ on two factors respectively. The method is to construct a family of Hermitian metrics and then compare them with the normalized HermitianYangMills metrics. We find that the metrics are close in $C^k$ to...
Source: http://arxiv.org/abs/1203.2986v2
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Octavio Arizmendi
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We introduce and study the notion of kdivisible elements in a noncommutative probability space. A kdivisible element is a (noncommutative) random variable whose nth moment vanishes whenever n is not a multiple of k. First, we consider the combinatorial convolution \ast in the lattices NC of noncrossing partitions and NC^k of kdivisible noncrossing partitions and show that convolving k times with the zetafunction in NC is equivalent to convolving once with the zetafunction in NC^k....
Source: http://arxiv.org/abs/1203.4780v1
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For any flag nestohedron, we define a flag simplicial complex whose $f$vector is the $\gamma$vector of the nestohedron. This proves that the $\gamma$vector of any flag nestohedron satisfies the FranklF\"{u}rediKalai inequalities, partially solving a conjecture by Nevo and Petersen \cite{np}. We also compare these complexes to those defined by Nevo and Petersen in \cite{np} for particular flag nestohedra.
Source: http://arxiv.org/abs/1203.4715v1
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A. Skopal; S. Shugarov; M. Vanko; P. Dubovsky; S. P. Peneva; E. Semkov; M. Wolf
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We present new multicolour (UBVRcIc) photometric observations of classical symbiotic stars, EG And, Z And, BF Cyg, CH Cyg, CI Cyg, V1329 Cyg, TX CVn, AG Dra, Draco C1, AG Peg and AX Per, carried out between 2007.1 and 2011.9. The aim of this paper is to present new data of our monitoring programme, to describe the main features of their light curves and to point problems for their future investigation. The data were obtained by the method of the classical photoelectric and CCD photometry.
Source: http://arxiv.org/abs/1203.4932v1
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Yang Jiao; Salvatore Torquato
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Biopolymer networks are of fundamental importance to many biological processes in normal and tumorous tissues. In this paper, we employ the panoply of theoretical and simulation techniques developed for characterizing heterogeneous materials to quantify the microstructure and effective diffusive transport properties (diffusion coefficient $D_e$ and mean survival time $\tau$) of collagen type I networks at various collagen concentrations. In particular, we compute the poresize probability...
Source: http://arxiv.org/abs/1203.4823v1
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Clotilde FermanianKammerer; Patrick Gérard; Caroline Lasser
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We study the evolution of Wigner measures of a family of solutions of a Schr\"odinger equation with a scalar potential displaying a conical singularity. Under a genericity assumption, classical trajectories exist and are unique, thus the question of the propagation of Wigner measures along these trajectories becomes relevant. We prove the propagation for general initial data.
Source: http://arxiv.org/abs/1203.5047v1
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H. Wilhelm; M. Baenitz; M. Schmidt; C. Naylor; R. Lortz; U. K. Roessler; A. A. Leonov; A. N. Bogdanov
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We report on magnetic susceptibility and specific heat measurements of the cubic helimagnet FeGe in external magnetic fields and temperatures near the onset of longrange magnetic order at T_C=278.2(3)K. Pronounced anomalies in the fielddependent chi_ac(H) data as well as in the corresponding imaginary part chi"_ac(H) reveal a precursor region around T_C in the magnetic phase diagram. The occurrence of a maximum at T_0=279.6K in the zerofield specific heat data indicates a second order...
Source: http://arxiv.org/abs/1203.4964v1
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Ali Kebarighotbi; Christos G. Cassandras
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We extend the definition of a Stochastic Hybrid Automaton (SHA) to overcome limitations that make it difficult to use for online control. Since guard sets do not specify the exact event causing a transition, we introduce a clock structure (borrowed from timed automata), timer states, and guard functions that disambiguate how transitions occur. In the modified SHA, we formally show that every transition is associated with an explicit element of an underlying event set. This also makes it...
Source: http://arxiv.org/abs/1203.5165v1
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Rory Barnes; Kristina Mullins; Colin Goldblatt; Victoria S. Meadows; James F. Kasting; Rene Heller
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Traditionally stellar radiation has been the only heat source considered capable of determining global climate on long timescales. Here we show that terrestrial exoplanets orbiting lowmass stars may be tidally heated at high enough levels to induce a runaway greenhouse for a long enough duration for all the hydrogen to escape. Without hydrogen, the planet no longer has water and cannot support life. We call these planets "Tidal Venuses," and the phenomenon a "tidal...
Source: http://arxiv.org/abs/1203.5104v2
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Bengt E. W. Nilsson
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In this note we review the construction of topologically gauged M2 branes with 6 supersymmetries and discuss some of its properties. This is done using the 3algebra formulation thereby covering all possible gauge groups. We will elaborate upon 1) the fundamental identity and its solutions noting, provided these gauged theories describe stacks of branes, the case of a single brane, 2) the chiral point solution to the field equations (occuring even for a single brane) that breaks the...
Source: http://arxiv.org/abs/1203.5090v1
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Christopher D. Burton
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Planckscale quantum spacetime undergoes probabilistic local curvature fluctuations whose distributions cannot explicitly depend on position otherwise vacuum's smallscale quantum structure would fail to be statistically homogeneous. Since the collection of fluctuations is a manybody system, the natural explanation for their positionindependent statistics is that they are in equilibrium with each other and distributed at maximum entropy. Consequently, their probability distributions obey the...
Source: http://arxiv.org/abs/1203.5238v2
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Vladislav Kargin
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It is shown that the normalized fluctuations of Riemann's zeta zeros around their predicted locations follow the Gaussian law. It is also shown that fluctuations of two zeros, \gamma_k and \gamma_{k+x}, with x asymptotically equal to \alpha(\log k)^{\beta}, with \beta>0, for large k follow the twovariate Gaussian distribution with correlation (1\beta)_+.
Source: http://arxiv.org/abs/1203.5309v1
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N. G. Guseva; Y. I. Izotov; K. J. Fricke; C. Henkel
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(abridged) Strongly starforming galaxies of subsolar metallicities are typical of the highredshift universe. Here we therefore provide accurate data for two lowz analogs, the wellknown lowmetallicity emissionline galaxies Haro 11 and ESO 338IG 004. On the basis of Very Large Telescope/Xshooter spectroscopic observations in the wavelength range 300024000\AA, we use standard direct methods to derive physical conditions and element abundances. Furthermore, we use Xshooter data together...
Source: http://arxiv.org/abs/1203.5268v1
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Tie Liu; YueFang Wu; Ke Wang
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Using the 13.7 m telescope of Purple Mountain Observatory (PMO), a survey of J=10 lines of CO and its isotopes was carried out towards 98 methanol maser sources in January 2008. Eightyfive sources have infrared counterparts within one arcmin. In the survey, except 43 sources showing complex or multiplepeak profiles, almost all the $^{13}$CO line profiles of the other 55 sources have large line widths of 4.5 km s$^{1}$ on average and are usually asymmetric. Fifty corresponding Infrared...
Source: http://arxiv.org/abs/1203.5389v1
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Let $M$ be a compact orientable irreducible 3manifold and $H$ be an unstabilized genus three Heegaard splitting of $M$. In this article, we will define a simplicial complex of weak reducing pairs for $H$ and find several properties of this complex. Using this method, we will prove that an unstabilized Heegaard splitting of genus three is critical in a certain condition. In addition, we will show that the standard genus three Heegaard splitting for $T^3$ and the induced Heegaard splitting of...
Source: http://arxiv.org/abs/1203.5487v1
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Sarah Kendrew; Robert J. Simpson; Eli Bressert; Matthew S. Povich; Reid Sherman; Chris Lintott; Thomas P. Robitaille; Kevin Schawinski; Grace WolfChase
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The Milky Way Project citizen science initiative recently increased the number of known infrared bubbles in the inner Galactic plane by an order of magnitude compared to previous studies. We present a detailed statistical analysis of this dataset with the Red MSX Source catalog of massive young stellar sources to investigate the association of these bubbles with massive star formation. We particularly address the question of massive triggered star formation near infrared bubbles. We find a...
Source: http://arxiv.org/abs/1203.5486v2
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GiaWei Chern; Rafael M. Fernandes; Rahul Nandkishore; Andrey V. Chubukov
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We show that the spindensity wave state on the partially filled honeycomb and triangular lattices is preempted by a paramagnetic phase that breaks an emergent Z_4 symmetry of the system, associated with the four inequivalent arrangements of spins in the quadrupled unit cell. Unlike other emergent paramagnetic phases in itinerant and localizedspin systems, this state preserves the rotational symmetry of the lattice but breaks its translational symmetry, giving rise to a superlattice structure...
Source: http://arxiv.org/abs/1203.5776v2
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Christian Rosendal
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We present a comprehensive theory of boundedness properties for Polish groups developed with a main focus on Roelcke precompactness (precompactness of the lower uniformity) and Property (OB) (boundedness of all isometric actions on separable metric spaces). In particular, these properties are characterised by the orbit structure of isometric actions on metric spaces and isometric or continuous affine representations on separable Banach spaces.
Source: http://arxiv.org/abs/1203.6047v1
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K. Krajewska; J. Z. Kaminski
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The spectra of Compton radiation emitted during electron scattering off an intense laser beam are calculated using the framework of strongfield quantum electrodynamics. We model these intense laser beams as finite length planewavefronted pulses, similar to Neville and Rohrlich [Phys. Rev. D {\bf 3}, 1692 (1971)], or as trains of such pulses. Expressions for energy and angular distributions of Compton photons are derived such that a comparison of both situations becomes meaningful. Comparing...
Source: http://arxiv.org/abs/1203.6022v2
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Maria Jose Marquez
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This paper describes a new approach to the optimization of information extraction in multiwavelength image cubes of cosmological fields. The objective is to create a framework for the automatic identification and tagging of sources according to various criteria (isolated source, partially overlapped, fully overlapped, crossmatched, etc) and to set the basis for the automatic production of the SEDs (spectral energy distributions) for all objects detected in the many multiwavelength images in...
Source: http://arxiv.org/abs/1203.6052v2
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Basile Morcrette
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This paper introduces and analyzes a particular class of Polya urns: balls are of two colors, can only be added (the urns are said to be additive) and at every step the same constant number of balls is added, thus only the color compositions varies (the urns are said to be balanced). These properties make this class of urns ideally suited for analysis from an "analytic combinatorics" pointofview, following in the footsteps of FlajoletDumasPuyhaubert, 2006. Through an algebraic...
Source: http://arxiv.org/abs/1203.4917v1
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L. E. Bleem; A. van Engelen; G. P. Holder; K. A. Aird; R. Armstrong; M. L. N. Ashby; M. R. Becker; B. A. Benson; T. Biesiadzinski; M. Brodwin; M. T. Busha; J. E. Carlstrom; C. L. Chang; H. M. Cho; T. M. Crawford; A. T. Crites; T. de Haan; S. Desai; M. A. Dobbs; O. Doré; J. Dudley; J. E. Geach; E. M. George; M. D. Gladders; A. H. Gonzalez; N. W. Halverson; N. Harrington; F. W. High; B. P. Holden; W. L. Holzapfel; S. Hoover; J. D. Hrubes; M. Joy; R. Keisler; L. Knox; A. T. Lee; E. M. Leitch; M....
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We compare cosmic microwave background lensing convergence maps derived from South Pole Telescope (SPT) data with galaxy survey data from the Blanco Cosmology Survey, the Widefield Infrared Survey Explorer, and a new large Spitzer/IRAC field designed to overlap with the SPT survey. Using optical and infrared catalogs covering between 17 and 68 square degrees of sky, we detect correlation between the SPT convergence maps and each of the galaxy density maps at >4 sigma, with zero...
Source: http://arxiv.org/abs/1203.4808v3
Source: https://www.youtube.com/watch?v=Xk8BkWeNsw Uploader: BigRedCotton Upload date: 20120413
Topics: Youtube, video, Music, Pigeon Town, Pension Town, New Orleans, Second Line parade, Stooges Brass...
Source: https://www.youtube.com/watch?v=EkZeg7gLpfI Uploader: BigRedCotton Upload date: 20120528
Topics: Youtube, video, Entertainment, New Orleans, Stooges Brass Band, second line parade, debcotton,...
corner of Washington and LaSalle. Featuring Lady Buckjumpers Renata Hampton and Donzella Lamar on hype patrol Source: https://www.youtube.com/watch?v=7Di0DDiWIUY Uploader: BigRedCotton Upload date: 20121212
Topics: Youtube, video, Music, Second line, brass band, parade, New Orleans, jazz, brass music, live music...
The unwashed masses. AKA NYC's tech industry and user community.
Topics: sopa, pipa, stopsopa, nytm, ows, occupywallst, newyorkcity, nyc, newyork, tech, schumer, gillibrand
Source: http://www.flickr.com/photos/jewschool/6722334449/
For narrative account, additional data, and usage see: http://www.rkwalton.com/salticids/Sitticus_palustris.php
Topics: Sitticus palustris, jumping spider video, salticidae, arachnid, jumping spiders