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Arxiv.org
by George Kastrinakis
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In previous reports (arXiv:0901.2487, arXiv:1007.0745), we introduced a new fermionic variational wavefunction, suitable for interacting multi-species systems and sustaining superfluidity. This disentangled wavefunction contains a new quantum index. Here we introduce a general spin triplet version of this wavefunction.
Source: http://arxiv.org/abs/1007.3421v3
Arxiv.org
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We give a presentation of the centralizer algebras for tensor products of spinor representations of quantum groups via generators and relations. In the even-dimensional case, this can be described in terms of non-standard q-deformations of orthogonal Lie algebras; in the odd-dimensional case only a certain subalgebra will appear. In the classical case q = 1 the relations boil down to Lie algebra relations.
Source: http://arxiv.org/abs/1107.4183v2
Metropolitan Museum of Art - Gallery Images
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Topics: Neolithic, Gonia, Terracotta, Metropolitan Museum of Art, Vessels, Vases, Fragments, ca....
Arxiv.org
by Yaming Wang; Laming Chen; Yuantao Gu
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The Modulated Wideband Converter (MWC) is a recently proposed analog-to-digital converter (ADC) based on Compressive Sensing (CS) theory. Unlike conventional ADCs, its quantization reference voltage, which is important to the system performance, does not equal the maximum amplitude of original analog signal. In this paper, the quantization reference voltage of the MWC is theoretically analyzed and the conclusion demonstrates that the reference voltage is proportional to the square root of $q$,...
Source: http://arxiv.org/abs/1203.1711v1
Arxiv.org
by Nathan Cooper; James Bateman; Alexander Dunning; Tim Freegarde
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We demonstrate a simple and robust technique for removal of the carrier wave from a phase-modulated laser beam, using a non-interferometric method that is insensitive to the modulation frequency and instead exploits the polarization-dependence of electro-optic modulation. An actively stabilized system using feedback via a liquid crystal cell yields long-term carrier suppression in excess of 28 dB at the expense of a 6.5 dB reduction in sideband power.
Source: http://arxiv.org/abs/1203.3676v1
Deb Cotton Secondline Collection
by BigRedCotton
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Source: https://www.youtube.com/watch?v=YCrssj1RSec Uploader: BigRedCotton Upload date: 20121107
Topics: Youtube, video, Music, Black Men of Labor, BMOL, Second line, brass band, parade, New Orleans,...
Arxiv.org
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We study the expanding properties of random perturbations of regular interval maps satisfying the summability condition of exponent one. Under very general conditions on the interval maps and perturbation types, we prove strong stochastic stability.
Source: http://arxiv.org/abs/1107.2537v3
The melting of the magnetic vortex lattice has been observed in high-Tc superconductors in many experiments by different groups and is regarded as confirmed. To date, only one group claims to have observed the vortex-lattice melting in the low-Tc superconductor Nb3Sn in specific-heat measurements. We measured the same Nb3Sn single crystal with a differential-thermal analysis method. We report on the absence of any sign of vortex-lattice melting in our data and discuss the possible reasons for...
Source: http://arxiv.org/abs/1203.1848v2
Arxiv.org
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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 Abhyankar-Sathaye embedding conjecture and the Dolgachev-Weisfeiler 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 1-stable C[x]-coordinates. We show that b_2 is in fact a C[x]-coordinate. We introduce the notion of Venereau-type polynomials, and...
Source: http://arxiv.org/abs/1007.2230v3
Arxiv.org
by Jonathan Stern; Ari Laor
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We present the emission properties of a sample of 3,579 type 1 AGN, selected based on the detection of broad H-alpha emission. The sample covers the range of black hole mass 10^6
Source: http://arxiv.org/abs/1203.5005v1
Arxiv.org
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A set of gauge invariants are identified for the gauge theory of quantum anholonomies, which comprise both the Berry phase and an exotic anholonomy in eigenspaces. We examine these invariants for hierarchical families of quantum circuits whose qubit size can be arbitrarily large. It is also found that a hierarchical family of quantum circuits generally involves an NP-complete problem.
Source: http://arxiv.org/abs/1203.5412v2
Arxiv.org
by Stephen Serjeant
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Bright submm-selected galaxies have been found to be a rich source of strong gravitational lenses. However, strong gravitational lensing of extended sources leads inevitably to differential magnification. In this paper I quantify the effect of differential magnification on simulated far-infrared and submm surveys of strong gravitational lenses, using a foreground population of Navarro-Frenk-White plus de Vaucouleurs' density profiles, with a model source resembling the Cosmic Eyelash and QSO...
Source: http://arxiv.org/abs/1203.2647v2
These women give one of - if not THE - best coming out debuts of all the second line clubs. This year did not disappoint. Corner of Jackson and St. Charles, even the street car pauses to pay tribute. This year's theme: "It is what it is". Big props to Divine Ladies president Angie Sever. She brings style and fire every year. Source: https://www.youtube.com/watch?v=q2vzCvN5YOA Uploader: BigRedCotton Upload date: 20120520
Topics: Youtube, video, Entertainment, New Orleans, Hot 8 Brass Band, second line parade, St. Charles...
Mycelial fans of Armillaria ostoyae, cause of Armillaria root disease, under the bark of a dying sugar pine. Photo by: Ellen Michaels Goheen or Donald J. Goheen Date: c.2012 Credit: USDA Forest Service, Region 6, State and Private Forestry, Forest Health Protection, Southwest Oregon Forest Insect and Disease Service Center Source: Goheen, E.M. and Goheen, D.J., 2014. Status of sugar and western white pines on federal forest lands in southwest Oregon: Inventory query and natural stand survey...
Topics: usda, stateandprivateforestry, treedamage, foresthealth, donaldjgoheen, forestdamage,...
Arxiv.org
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In most star formation history (SFH) measurements, the reported uncertainties are those due to effects whose sizes can be readily measured: Poisson noise, adopted distance and extinction, and binning choices in the solution itself. However, the largest source of error, systematics in the adopted isochrones, is usually ignored and very rarely explicitly incorporated into the uncertainties. I propose a process by which estimates of the uncertainties due to evolutionary models can be incorporated...
Source: http://arxiv.org/abs/1203.4634v1
Arxiv.org
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We propose a modified procedure for extracting the numerical value for the strong coupling constant $\alpha_s$ from the $\tau$ lepton hadronic decay rate into non-strange particles in the vector channel. We employ the concept of the quark-hadron duality specifically, introducing a boundary energy squared $s_{\rm p}>0$, the onset of the perturbative QCD continuum in Minkowski space \cite{BLR,Rafa,PPR}. To approximate the hadronic spectral function in the region $s>s_{\rm p}$, we use...
Source: http://arxiv.org/abs/1005.2674v3
Arxiv.org
by Chengwen Xing; Shaodan Ma; Yik-Chung Wu; Tung-Sang Ng
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In this paper, linear transceiver design for dual-hop non-regenerative (amplify-and-forward (AF)) MIMO-OFDM systems under channel estimation errors is investigated. Second order moments of channel estimation errors in the two hops are first deduced. Then based on the Bayesian framework, joint design of linear forwarding matrix at the relay and equalizer at the destination under channel estimation errors is proposed to minimize the total mean-square-error (MSE) of the output signal at the...
Source: http://arxiv.org/abs/1005.5577v2
Arxiv.org
by Tankut Can; Hui Dai; Dirk K. Morr
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Using the non-equilibrium Keldysh Green's function formalism, we show that the non-equilibrium charge transport in nanoscopic quantum networks takes place via {\it current eigenmodes} that possess characteristic spatial patterns. We identify the microscopic relation between the current patterns and the network's electronic structure and topology and demonstrate that these patterns can be selected via gating or constrictions, providing new venues for manipulating charge transport at the...
Source: http://arxiv.org/abs/1203.3198v1
Arxiv.org
by Robert F. Bailey; José Cáceres; Delia Garijo; Antonio González; Alberto Márquez; Karen Meagher; María Luz Puertas
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A set of vertices $S$ in a graph $G$ is a {\em resolving set} for $G$ if, for any two vertices $u,v$, there exists $x\in S$ such that the distances $d(u,x) \neq d(v,x)$. In this paper, we consider the Johnson graphs $J(n,k)$ and Kneser graphs $K(n,k)$, and obtain various constructions of resolving sets for these graphs. As well as general constructions, we show that various interesting combinatorial objects can be used to obtain resolving sets in these graphs, including (for Johnson graphs)...
Source: http://arxiv.org/abs/1203.2660v2
7th Ward Funk - original music by TBC Source: https://www.youtube.com/watch?v=r68_D8odrAc Uploader: BigRedCotton Upload date: 20121212
Topics: Youtube, video, Entertainment, Second line, brass band, parade, New Orleans, jazz, brass music,...
Arxiv.org
by Per Berglund; Jishnu Bhattacharyya; David Mattingly
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We study electromagnetically charged dilatonic black brane solutions in arbitrary dimensions with flat transverse spaces, that are asymptotically AdS. This class of solutions includes spacetimes which possess a bulk region where the metric is approximately invariant under Lifshitz scalings. Given fixed asymptotic boundary conditions, we analyze how the behavior of the bulk up to the horizon varies with the charges and derive the extremality conditions for these spacetimes.
Source: http://arxiv.org/abs/1107.3096v2
Metropolitan Museum of Art - Gallery Images
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Topics: Stone, Gypsum, Iran, Gypsum alabaster, Alabaster, Metropolitan Museum of Art, Asia, Amulets, ca....
Arxiv.org
by R. Parthasarathy
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The apparent violation of causality in the brane Universe can be avoided by taking the bulk spacetime modelled by a 5-dimensional Kaluza theory with factorizable ansatz for the 5-dimensional metric whose components do not depend on the fifth coordinate and with $G_{55}$ not a constant. The geodesic in the bulk does not correspond to a free particle. The Kaluza scalar makes it non-inertial. The implication on the neutrino experiment is that there is no superluminal propagation even after...
Source: http://arxiv.org/abs/1203.6192v1
Arxiv.org
by Friedrich Götze; Andrei Yu. Zaitsev
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The aim of this paper is to investigate, which infinite dimensional consequences follow from the main results of recently published paper of the authors (2009) (see Theorems 2 and 3). We show that the finite dimensional Theorem 3 implies meaningful estimates for the rate of strong Gaussian approximation of sums of i.i.d. Hilbert space valued random vectors $\xi_j$ with finite moments $E |\xi_j|^\gamma$, $\gamma>2$. We show that the rate of approximation depends substantially on the rate of...
Source: http://arxiv.org/abs/1203.5695v1
Arxiv.org
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We propose a set of devices of simple geometrical design which may exhibit a permanent rotation due to quantum (vacuum) fluctuations. These objects - which have no moving parts - impose certain boundary conditions on quantum fluctuations thus affecting their vacuum energy similarly to the standard Casimir effect. The boundary conditions are chosen in such a way that the vacuum energy for a static device is larger compared to the energy of the vacuum fluctuations in a state when the device...
Source: http://arxiv.org/abs/1203.6588v1
Arxiv.org
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In this paper we study ideals generated by quite general sets of 2-minors of an $m \times n$-matrix of indeterminates. The sets of 2-minors are defined by collections of cells and include 2-sided ladders. For convex collections of cells it is shown that the attached ideal of 2-minors is a Cohen--Macaulay prime ideal. Primality is also shown for collections of cells whose connected components are row or column convex. Finally the class group of the ring attached to a stack polyomino and its...
Source: http://arxiv.org/abs/1203.0407v1
Arxiv.org
by Luke Barclay; Ruth Gregory; Susha Parameswaran; Gianmassimo Tasinato; Ivonne Zavala
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We compute string theoretic black hole solutions having Lifshitz asymptotics with a general dynamical exponent z>1. We start by constructing solutions in a flux compactification of six dimensional supergravity, then uplift them to massive type IIA supergravity. Alongside the Lifshitz black holes we study the simpler anti-de Sitter solutions, of which there are a 1-parameter family in this supergravity, and compare and contrast their properties. The black holes are characterized by a two-form...
Source: http://arxiv.org/abs/1203.0576v2
Arxiv.org
by Yoichi Motohashi
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This is my talk delivered at the workshop 'Automorphic L-Functions and related prpblems' (March 10--13, 2012, Tokyo University). We showed an instance of applications of the theory of automorphic representations to a genuinely traditional problem in the theory of the zeta and allied functions. We restricted ourselves to very basic issues and results, because of the purpose of the workshop.
Source: http://arxiv.org/abs/1203.2694v1
Arxiv.org
by Franco Buccella; Domenico Falcone; Chee Sheng Fong; Enrico Nardi; Giulia Ricciardi
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We consider the see-saw mechanism within a non-supersymmetric SO(10) model. By assuming the SO(10) quark-lepton symmetry, and after imposing suitable conditions that ensure that the right-handed (RH) neutrino masses are at most mildly hierarchical (compact RH spectrum) we obtain a surprisingly predictive scenario. The absolute neutrino mass scale, the Dirac and the two Majorana phases of the neutrino mixing matrix remain determined in terms of the set of already measured low energy observables,...
Source: http://arxiv.org/abs/1203.0829v2
Arxiv.org
by Yaroslav D. Sergeyev
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The First Hilbert problem is studied in this paper by applying two instruments: a new methodology distinguishing between mathematical objects and mathematical languages used to describe these objects; and a new numeral system allowing one to express different infinite numbers and to use these numbers for measuring infinite sets. Several counting systems are taken into consideration. It is emphasized in the paper that different mathematical languages can describe mathematical objects (in...
Source: http://arxiv.org/abs/1203.4141v1
Arxiv.org
by Thomas Speck; Richard L. C. Vink
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Theoretical models describing specific adhesion of membranes predict (for certain parameters) a macroscopic phase separation of bonds into adhesion domains. We show that this behavior is fundamentally altered if the membrane is pinned randomly due to, e.g., proteins that anchor the membrane to the cytoskeleton. Perturbations which locally restrict membrane height fluctuations induce quenched disorder of the random-field type. This rigorously prevents the formation of macroscopic adhesion...
Source: http://arxiv.org/abs/1203.2493v2
Deb Cotton Secondline Collection
by BigRedCotton
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Source: https://www.youtube.com/watch?v=JDxNu8RO7v4 Uploader: BigRedCotton Upload date: 20120924
Topics: Youtube, video, Entertainment, clip, 2012, 09, 23, 12, 27, 59, debcotton,...
Arxiv.org
by Subhamoy Ghatak; Atindra Nath Pal; Arindam Ghosh
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We present low temperature electrical transport experiments in five field effect transistor devices consisting of monolayer, bilayer and trilayer MoS2 films, mechanically exfoliated onto Si/SiO2 substrate. Our experiments reveal that the electronic states in all films are localized well up to the room temperature over the experimentally accessible range of gate voltage. This manifests in two dimensional (2D) variable range hopping (VRH) at high temperatures, while below \sim 30 K the...
Source: http://arxiv.org/abs/1203.5656v1
Metropolitan Museum of Art - Gallery Images
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Topics: Europe, Thessaly, Greece, Terracotta, Metropolitan Museum of Art, Neolithic, Thessaly, Vessels,...
Arxiv.org
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Random coding, along with various standard techniques such as coded time-sharing, rate-splitting, superposition coding, and binning, are traditionally used in obtaining achievable rate regions for multi-terminal networks. The error analysis of such an achievable scheme relies heavily on the properties of strongly joint typical sequences and on bounds of the cardinality of typical sets. In this work, we obtain an achievable rate region for a general (i.e. an arbitrary set of messages shared...
Source: http://arxiv.org/abs/1107.4705v2
Arxiv.org
by Mitsuyasu Hashimoto
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Let $p$ be a prime number. We define the notion of $F$-finiteness of homomorphisms of $\mathbb F_p$-algebras, and discuss some basic properties. In particular, we prove a sort of descent theorem on $F$-finiteness of homomorphisms of $\mathbb F_p$-algebras. As a corollary, we prove the following. Let $g:B\to C$ be a homomorphism of Noetherian $\mathbb F_p$-algebras. If $g$ is faithfully flat reduced, and $C$ is $F$-finite, then $B$ is $F$-finite. This is a generalization of Seydi's result on...
Source: http://arxiv.org/abs/1203.3640v2
Arxiv.org
by Satoshi Takagi
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In this paper, we introduce a new algebraic type of `convexoid rings', and we give the definition of (weak) convexoid schemes, which share similar properties with ordinary schemes. As a result, we give a purely-algebraic construction of the compactification of Spec Z (in Arakelov's sense) which is realized as the Zariski-Riemann space in the category of weak convexoid schemes.
Source: http://arxiv.org/abs/1203.4914v2
Arxiv.org
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A nonlinear electromagnetic scattering problem is studied in the presence of bound states in the radiation continuum. It is shown that the solution is not analytic in the nonlinear susceptibility and the conventional perturbation theory fails. A non-perturbative approach is proposed and applied to the system of two parallel periodic arrays of dielectric cylinders with a second order nonlinear susceptibility. This scattering system is known to have bound states in the radiation continuum. In...
Source: http://arxiv.org/abs/1107.0468v2
Deb Cotton Secondline Collection
movies

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Super Sunday 2012, Young Men Olymipian Jr. and the Hot 8 Brass Band rolling thru Central City playing Michael Jackson's 'Working Day and Night' Source: https://www.youtube.com/watch?v=CQmpCHlvzH0 Uploader: BigRedCotton Upload date: 20120318
Topics: Youtube, video, Music, Hot 8 Brass Band, New Orleans, Got Me Working Day and Night, Michael...
Arxiv.org
by Serge Gaspers
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Let f(k) denote the maximum such that every simple undirected graph containing two vertices s,t and k edge-disjoint s-t paths, also contains two vertices u,v and f(k) independent u-v paths. Here, a set of paths is independent if none of them contains an interior vertex of another. We prove that f(k)=k if k
Source: http://arxiv.org/abs/1203.4483v1
Arxiv.org
by Ridha Horchani; Hans Lignier; Nadia Bouloufa-Maafa; 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 well-chosen state from which they may decay to the singlet state throug\textcolor{black}{h two sequential single-photon emission steps: Th}e first photon populates levels with mixed triplet-singlet character,...
Source: http://arxiv.org/abs/1203.1431v1
Deb Cotton Secondline Collection
by BigRedCotton
movies

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Source: https://www.youtube.com/watch?v=_ccrKUciTeo Uploader: BigRedCotton Upload date: 20120521
Topics: Youtube, video, Entertainment, clip, 2012, 05, 20, 12, 29, 38, debcotton,...
Arxiv.org
by S. H. P. Alencar; J. Bouvier; F. M. Walter; C. Dougados; J. -F. Donati; R. Kurosawa; M. Romanova; X. Bonfils; G. H. R. A. Lima; S. Massaro; M. Ibrahimov; E. Poretti
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We analyze the photometric and spectroscopic variability of the classical T Tauri star V2129 Oph over several rotational cycles to test the dynamical predictions of magnetospheric accretion models. The photometric variability and the radial velocity variations in the photospheric lines can be explained by rotational modulation due to cold spots, while the radial velocity variations of the He I (5876 \AA) line and the veiling variability are due to hot spot rotational modulation. The hot and...
Source: http://arxiv.org/abs/1203.6331v1
Arxiv.org
by 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 impossible-to-beat quantum advantage on a four-dimensional quantum system defined by the polarization and orbital angular momentum of a single photon. The results show...
Source: http://arxiv.org/abs/1203.0980v1
Arxiv.org
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We examined 134 Chandra observations of the population of X-ray sources associated with globular clusters (GCs) in the central region of M31. These are expected to be X-ray binary systems (XBs), consisting of a neutron star or black hole accreting material from a close companion. We created long-term lightcurves for these sources, correcting for background, interstellar absorption and instrumental effects. We tested for variability by examining the goodness of fit for the best fit constant...
Source: http://arxiv.org/abs/1203.2583v2
Arxiv.org
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4-dimensional $F_{4} $ polytopes and their dual polytopes have been constructed as the orbits of the Coxeter-Weyl group $W(F_{4})$ where the group elements and the vertices of the polytopes are represented by quaternions. Branchings of an arbitrary \textbf{$W(F_{4})$} orbit under the Coxeter groups $W(B_{4} $ and $W(B_{3}) \times W(A_{1})$ have been presented. The role of group theoretical technique and the use of quaternions have been emphasized
Source: http://arxiv.org/abs/1203.4574v1
Deb Cotton Secondline Collection
movies

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TBC playing 'Shallow Water' Source: https://www.youtube.com/watch?v=kYItYLN0x0k Uploader: BigRedCotton Upload date: 20121212
Topics: Youtube, video, Music, Second line, brass band, parade, New Orleans, jazz, brass music, live music...
Arxiv.org
by Yoshihiko Okamoto; Takeshi Shimizu; Jun-ichi Yamaura; Zenji Hiroi
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The chemical composition, crystal structure, and magnetic properties of a manganese zinc alloy with an ideal composition of YMn2Zn20, which comprises a pyrochlore lattice made of Mn atoms, are reported. The compound is stable only when In or Al is partially substituted for Zn. We have determined the actual chemical formula as YMn2+dZn20-x-dMx, with M = In or Al, and have identified the characteristic preferences with which the incorporated M and excess Mn atoms occupy the three crystallographic...
Source: http://arxiv.org/abs/1203.4887v1
Arxiv.org
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We realize the integral Specht modules for the symmetric group $S_n$ as induced modules from the subalgebra of the group algebra generated by the Jucys-Murphy elements. We deduce from this that the simple modules for $FS_n$ are generated by reductions modulo $p$ of the corresponding Jucys-Murphy idempotents.
Source: http://arxiv.org/abs/1107.3076v3
Arxiv.org
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We calculate cross sections for $g g \to Q \bar Q Q \bar Q$ in the high-energy approximation in the mixed (longitudinal momentum fraction, impact parameter) and momentum space representations. Besides the total cross section as a function of subsystem energy also differential distributions (in quark rapidity, transverse momentum, $Q Q$, $Q \bar Q$ invariant mass) are presented. The elementary cross section is used to calculate production of $(c \bar c) (c \bar c)$ in single-parton scattering...
Source: http://arxiv.org/abs/1203.4129v1
Arxiv.org
by Yi Huang
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We prove a McShane-type identity - a series, expressed in terms of geodesic lengths, that sums to 2\pi for any closed hyperbolic surface with one distinguished point. To do so, we prove a generalized Birman-Series theorem showing that the set of complete geodesics on a hyperbolic surface with large cone angles is sparse.
Source: http://arxiv.org/abs/1203.3860v4
Arxiv.org
by C. S. Lopez-Monsalvo; F. Nettel; A. Sanchez
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We comment on the conclusions found by Larra\~naga and Mojica regarding the consistency of the Geoemtrothermodynamics programme to describe the critical behaviour of a Gibbons-Maeda-Garfinkle-Horowitz-Strominger charged black hole. We argue that making the appropriate choice of metric for the thermodynamic phase space and, most importantly, considering the homogeneity of the thermodynamic potential we obtain consistent results for such a black hole.
Source: http://arxiv.org/abs/1203.6444v1
Arxiv.org
by Shantanu Basu; Eduard I. Vorobyov
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We present a calculation of protostellar disk formation and evolution in which gaseous clumps (essentially, the first Larson cores formed via disk fragmentation) are ejected from the disk during the early stage of evolution. This is a universal process related to the phenomenon of ejection in multiple systems of point masses. However, it occurs in our model entirely due to the interaction of compact, gravitationally-bound gaseous clumps and is free from the smoothing-length uncertainty that is...
Source: http://arxiv.org/abs/1203.0274v1
Arxiv.org
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We consider perturbations of Dirac type operators on complete, connected metric spaces equipped with a doubling measure. Under a suitable set of assumptions, we prove quadratic estimates for such operators and hence deduce that these operators have a bounded functional calculus. In particular, we deduce a Kato square root type estimate.
Source: http://arxiv.org/abs/1107.3905v2
Arxiv.org
by M. Berciu; R. Chakarvorty; Y. Y. Zhou; M. T. Alam; K. Traudt; R. Jakiela; A. Barcz; T. Wojtowicz; X. Liu; J. K. Furdyna; M. Dobrowolska
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We present a unified interpretation of experimentally observed magnetic circular dichroism (MCD) in the ferromagnetic semiconductor (Ga,Mn)As, based on theoretical arguments, which demonstrates that MCD in this material arises primarily from a difference in the density of spin-up and spin-down states in the valence band brought about by the presence of the Mn impurity band, rather than being primarily due to the Zeeman splitting of electronic states.
Source: http://arxiv.org/abs/1203.1853v1
Arxiv.org
by Adrian Dumitrescu; Minghui Jiang; János Pach
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The problem of finding "small" sets that meet every straight-line which intersects a given convex region was initiated by Mazurkiewicz in 1916. We call such a set an {\em opaque set} or a {\em barrier} for that region. We consider the problem of computing the shortest barrier for a given convex polygon with $n$ vertices. No exact algorithm is currently known even for the simplest instances such as a square or an equilateral triangle. For general barriers, we present an approximation...
Source: http://arxiv.org/abs/1005.2218v5
Arxiv.org
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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
Arxiv.org
by Rolando Biscay; Hélène Lescornel; Jean-Michel Loubes
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We provide in this paper a fully adaptive penalized procedure to select a covariance among a collection of models observing i.i.d replications of the process at fixed observation points. For this we generalize previous results of Bigot and al. and propose to use a data driven penalty to obtain an oracle inequality for the estimator. We prove that this method is an extension to the matricial regression model of the work by Baraud.
Source: http://arxiv.org/abs/1203.0107v1
Arxiv.org
by Gil R. Cavalcanti
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We use the procedure of reduction of Courant algebroids to reduce strong KT, hyper KT and generalized Kaehler structures on Courant algebroids. This allows us to recover results from the literature as well as explain from a different angle some of the features observed there in. As an example, we prove that the moduli space of instantons of a bundle over a SKT/HKT/generalized K\"ahler manifold is endowed with the same type of structure as the original manifold.
Source: http://arxiv.org/abs/1203.0497v1
Arxiv.org
by B. Parise; F. Du; F. -C. Liu; A. Belloche; H. Wiesemeyer; R. Güsten; K. M. Menten; H. W. Hübers; B. Klein
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Although water is an essential and widespread molecule in star-forming regions, its chemical formation pathways are still not very well constrained. Observing the level of deuterium fractionation of OH, a radical involved in the water chemical network, is a promising way to infer its chemical origin. We aim at understanding the formation mechanisms of water by investigating the origin of its deuterium fractionation. This can be achieved by observing the abundance of OD towards the low-mass...
Source: http://arxiv.org/abs/1203.2825v1
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We investigate femtoscopic $\pi \pi$ correlations using the UrQMD approach combined with a correlation afterburner. The dependence of $\pi \pi$ correlations on the charged particle multiplicity and formation time in p+p collisions at $\sqrt{s_{NN}}$= 7 TeV is explored and compared to present ALICE data. The data allows to constrain the formation time in the string fragmentation to $\tau_f \leq 0.8$ fm/c.
Source: http://arxiv.org/abs/1203.4421v1
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We present a general scheme for the calculation of the Renyi entropy of a subsystem in quantum many-body models that can be efficiently simulated via quantum Monte Carlo. When the simulation is performed at very low temperature, the above approach delivers the entanglement Renyi entropy of the subsystem, and it allows to explore the crossover to the thermal Renyi entropy as the temperature is increased. We implement this scheme explicitly within the Stochastic Series expansion as well as within...
Source: http://arxiv.org/abs/1203.5752v1
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Mishchenko's theorem states that piecewise smooth and Lie algebroid cohomology of a transitive Lie algebroid defined over a combinatorial manifold are isomorphic. In this paper, we describe two applications of that result. The first application consists in the relationship between piecewise de Rham cohomology of a Lie groupoid and piecewise smooth cohomology of its Lie algebroid. For the second application, we combine the classical result dealing with invariant cohomology in Lie algebroids with...
Source: http://arxiv.org/abs/1203.6699v1
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We analyze gradient flows with jumps generated by a finite set of complete vector fields in involution using some Radon measures $u\in \mathcal{U}_a$ as admissible perturbations. Both the evolution of a bounded gradient flow $\{x^u(t,\l)\in B(x^*,3\g)\subseteq \mbn: \,t\in[0,T],\,\l\in B(x^*,2\g)\}$ and the unique solution $\l=\psi^u(t,x)\in B(x^*,2\g)\subseteq \mbn$ of integral equation $x^u(t,\l)=x\in B(x^*,\g), \,t\in[0,T]$, are described using the corresponding gradient representation...
Source: http://arxiv.org/abs/1203.1741v1
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We prove a formal power series identity, relating the arithmetic sum-of-divisors function to commuting triples of permutations. This establishes a conjecture of Franklin T. Adams-Watters.
Source: http://arxiv.org/abs/1203.5079v1
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The secondary-to-primary B/C ratio is widely used to study the cosmic ray (CR) propagation processes in the Galaxy. It is usually assumed that secondary nuclei such as Li-Be-B are entirely generated by collisions of heavier CR nuclei with the interstellar medium (ISM). We study the CR propagation under a scenario where secondary nuclei can also be produced or accelerated from galactic sources. We consider the processes of hadronic interactions inside supernova remnants (SNRs) and...
Source: http://arxiv.org/abs/1203.6094v2
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We consider gradient estimates to positive solutions of porous medium equations and fast diffusion equations: $$u_t=\Delta_\phi(u^p)$$ associated with the Witten Laplacian on Riemannian manifolds. Under the assumption that the $m$-dimensional Bakry-Emery Ricci curvature is bounded from below, we obtain gradient estimates which generalize the results in [20] and [13]. Moreover, inspired by X. -D. Li's work in [19] we also study the entropy formulae introduced in [20] for porous medium equations...
Source: http://arxiv.org/abs/1203.5482v1
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by Kenji Fukushima; Jan M. Pawlowski
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We analyze chiral symmetry breaking in quark matter in an external magnetic field at zero and finite temperature and quark chemical potential. We first give a brief overview of analytic results within the mean-field approximation. There the critical temperature for chiral restoration is increased by the magnetic field effect. Then we investigate the effects of matter and quantum fluctuations on the Magnetic Catalysis. More specifically, we compute the critical coupling as a function of the...
Source: http://arxiv.org/abs/1203.4330v1
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by Andreas Andresen; Peter Imkeller; Nicolas Perkowski
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Ciesielski's isomorphism between the space of alpha-H\"older continuous functions and the space of bounded sequences is used to give an alternative proof of the large deviation principle for Wiener processes with values in Hilbert space.
Source: http://arxiv.org/abs/1203.4596v1
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by Bhramar Chatterjee; P. Mitra
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Attempts to understand Hawking radiation as tunnelling across a black hole horizon require the consideration of singular integrals. Although Schwarzschild coordinates lead to the standard Hawking temperature, isotropic radial coordinates may appear to produce an incorrect value. It is demonstrated here how the proper regularization of singular integrals leads to the standard temperature for the isotropic radial coordinates as well as for other smooth transformations of the radial variable,...
Source: http://arxiv.org/abs/1107.1336v3
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by Sonia De Cosmis; Renato De Leone
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The concepts of infinity and infinitesimal in mathematics date back to anciens Greek and have always attracted great attention. Very recently, a new methodology has been proposed by Sergeyev for performing calculations with infinite and infinitesimal quantities, by introducing an infinite unit of measure expressed by the numeral grossone. An important characteristic of this novel approach is its attention to numerical aspects. In this paper we will present some possible applications and use of...
Source: http://arxiv.org/abs/1107.5681v2
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Kagan and Shepp (2005, Amer. Statist.) presented an elegant example of a mixture model for which an insufficient statistic preserves Fisher information. This note uses the regularity property of differentiability in quadratic mean to provide another explanation for the phenomenon they observed. Some connections with Le Cam's theory for convergence of experiments are noted.
Source: http://arxiv.org/abs/1107.3797v2
Bob Schroeter, USFS aerial observer with Digital Aerial Sketch Map (DASM) system and Xplore tablet computer in the Oregon Department of Forestry's Partenavia. Photo by: Unknown Date: c.2012 Credit: USDA Forest Service, Region 6, State and Private Forestry, Forest Health Protection. Source: Aerial Survey Program collection. For geospatial data collected during annual aerial forest insect and disease detection surveys see: www.fs.usda.gov/detail/r6/forest-grasslandhealth/insects-... For related...
Topics: r6, usda, stateandprivateforestry, partenavia, c.2012, foresthealth, region6, fhp,...
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by Mingxing Luo; Liucheng Wang; Guohuai Zhu
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By using recent data, we directly determine the dark matter (DM) induced $e^\pm$ spectrum at the source from experimental measurements at the earth, without reference to specific particle physics models. The DM induced gamma rays emitted via inverse Compton scattering are then obtained in a model independent way. However the results depend on the choice of the astrophysical $e^\pm$ background, which is not reliably known. Nevertheless, we calculate, as an illustration, the fluxes of gamma rays...
Source: http://arxiv.org/abs/1107.3024v4
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by Ulrich Kohlenbach; Laurentiu Leustean
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This paper provides an effective uniform rate of metastability (in the sense of Tao) on the strong convergence of Halpern iterations of nonexpansive mappings in CAT(0) spaces. The extraction of this rate from an ineffective proof due to Saejung is an instance of the general proof mining program which uses tools from mathematical logic to uncover hidden computational content from proofs. This methodology is applied here for the first time to a proof that uses Banach limits and hence makes a...
Source: http://arxiv.org/abs/1107.3215v4
Arxiv.org
by G. J. M. Luna; M. P. Diaz; N. S. Brickhouse; M. Moraes
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We report the results from the temporal and spectral analysis of an XMM-Newton observation of Nova Centauri 1986 (V842 Cen). We detect a period at 3.51$\pm$0.4 h in the EPIC data and at 4.0$\pm$0.8 h in the OM data. The X-ray spectrum is consistent with the emission from an absorbed thin thermal plasma with a temperature distribution given by an isobaric cooling flow. The maximum temperature of the cooling flow model is $kT_{max}=43_{-12}^{+23}$ keV. Such a high temperature can be reached in a...
Source: http://arxiv.org/abs/1203.4804v1
Occupy Wall Street Flickr Archive
by bitchcakesny
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I was so excited to finally run into the protestors!!!
Topics: 20120103, January, 2012, NYC, Winter, Grand, Central, Terminal, GCT, Manhattan, Commuting, Protest,...
Source: http://www.flickr.com/photos/bitchcakes/6632020621/
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by Holger Brenner; Axel Stäbler
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Let $Y \to B$ be a relative smooth projective curve over an affine integral base scheme $B$ of positive characteristic. We provide for all prime characteristics example classes of vector bundles $\mathcal{S}$ over $Y$ such that $\mathcal{S}$ is generically strongly semistable and semistable but not strongly semistable for some special fibre. This also provides new examples of the behaviour of Hilbert-Kunz multiplicities in geometric families.
Source: http://arxiv.org/abs/1107.0877v4
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by L. Basso; K. Mimasu; S. Moretti
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We study the sensitivity of top-antitop samples produced at all energy stages of the Large Hadron Collider (LHC) to the nature of an underlying Z' boson, in presence of full tree level standard model (SM) background effects and relative interferences. We concentrate on differential mass spectra as well as both spatial and spin asymmetries thereby demonstrating that exploiting combinations of these observables will enable one to distinguish between sequential Z's and those pertaining to...
Source: http://arxiv.org/abs/1203.2542v2
A corrector theory for the strong approximation of gradient fields inside periodic composites made from two materials with different power law behavior is provided. Each material component has a distinctly different exponent appearing in the constitutive law relating gradient to flux. The correctors are used to develop bounds on the local singularity strength for gradient fields inside micro-structured media. The bounds are multi-scale in nature and can be used to measure the amplification of...
Source: http://arxiv.org/abs/1107.3181v2
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by Johannes Noller
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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 co-ordinate invariants. Specifically we consider the first such non-trivial 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 mass-altering mechanism, potentially...
Source: http://arxiv.org/abs/1203.6639v1
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by Vincenzo Alba; Masudul Haque; Andreas M. Laeuchli
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The entanglement between two parts of a many-body system can be characterized in detail by the entanglement spectrum. Focusing on gapped phases of one-dimensional systems, we show how this spectrum is dominated by contributions from the boundary between the parts. This contradicts the view of an "entanglement Hamiltonian" as a bulk entity. The boundary-local nature of the entanglement spectrum is clarified through its hierarchical level structure, through the combination of two...
Source: http://arxiv.org/abs/1107.1726v2
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by Sourav Chatterjee; Jonathan C. Tan
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The Orion Nebula Cluster (ONC) is the nearest region of massive star formation and thus a crucial testing ground for theoretical models. Of particular interest amongst the ONC's ~1000 members are: \theta^1 Ori C, the most massive binary in the cluster with stars of masses 38 and 9 MSun (Kraus et al. 2009); the Becklin-Neugebauer (BN) object, a 30 km/s runaway star of ~8 MSun (Tan 2004); and the Kleinmann-Low (KL) nebula protostar, a highly-obscured, ~15 MSun object still accreting gas while...
Source: http://arxiv.org/abs/1203.0325v4
Arxiv.org
by R. Margutti; E. Zaninoni; M. G. Bernardini; G. Chincarini; F. Pasotti; C. Guidorzi; L. Angelini; D. N. Burrows; M. Capalbi; P. A. Evans; N. Gehrels; J. Kennea; V. Mangano; A. Moretti; J. Nousek; J. P. Osborne; K. L. Page; M. Perri; J. Racusin; P. Romano; B. Sbarufatti; S. Stafford; M. Stamatikos
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We present a comprehensive statistical analysis of Swift X-ray light-curves of Gamma-Ray Bursts (GRBs) collecting data from more than 650 GRBs discovered by Swift and other facilities. The unprecedented sample size allows us to constrain the REST FRAME X-ray properties of GRBs from a statistical perspective, with particular reference to intrinsic time scales and the energetics of the different light-curve phases in a common rest-frame 0.3-30 keV energy band. Temporal variability episodes are...
Source: http://arxiv.org/abs/1203.1059v2
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In this thesis, we answer several questions about the behaviour of prover-verifier interactions under parallel repetition when quantum information is allowed, and the verifier acts independently in them. We first consider the case in which a value is associated with each of the possible outcomes of an interaction. We prove that it is not possible for the prover to improve on the optimum average value per repetition by repeating the protocol multiple times in parallel. We look then at games in...
Source: http://arxiv.org/abs/1203.4885v1
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by Arun Sridharan; C. Emre Koksal
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We consider the problem of link scheduling for wireless networks with fading channels, where the link rates are varying with time. Due to the high computational complexity of the throughput optimal scheduler, we provide a low complexity greedy link scheduler GFS, with provable performance guarantees. We show that the performance of our greedy scheduler can be analyzed using the Local Pooling Factor (LPF) of a network graph, which has been previously used to characterize the stability of the...
Source: http://arxiv.org/abs/1203.2024v1
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Fermion production in an external Coulomb field on de Sitter expanding universe is studied. The amplitude and probability of pair production in an external Coulomb field are computed and the cases of large/small values of the expansion factor comparatively with the particle mass are studied. We obtain from our calculations that the modulus of the momentum is no longer a conserved quantity. We find that in the de Sitter space there are probabilities for production processes where the helicity is...
Source: http://arxiv.org/abs/1203.0151v1
Arxiv.org
by Magnus V. Persson; Jes K. Jørgensen; Ewine F. van Dishoeck
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Water is present during all stages of star formation: as ice in the cold outer parts of protostellar envelopes and dense inner regions of circumstellar disks, and as gas in the envelopes close to the protostars, in the upper layers of circumstellar disks and in regions of powerful outflows and shocks. In this paper we probe the mechanism regulating the warm gas-phase water abundance in the innermost hundred AU of deeply embedded (Class~0) low-mass protostars, and investigate its chemical...
Source: http://arxiv.org/abs/1203.4969v1
Arxiv.org
by 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 pseudo-metrics 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 pseudo-metrics have quantum information theoretical meanings. So it is instructive to study this kind of metrics and pseudo-metrics 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
Featuring Bernard and Chris Tero of the Sudan Social Aid and Pleasure Club Source: https://www.youtube.com/watch?v=ScZHyAUhocE Uploader: BigRedCotton Upload date: 20120808
Topics: Youtube, video, Entertainment, To Be Continued Brass Band, New Orleans, Treme, Satchmo, Louis...
Arxiv.org
by 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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We study the dynamics of galactic disk formation and evolution in 'realistic' LambdaCDM haloes with idealized baryonic initial conditions. We add rotating spheres of hot gas at z=1.3 to two fully cosmological dark-matter-only halo (re)simulations. The gas cools according to an artificial and adjustable cooling function to form a rotationally supported galaxy. The simulations evolve in the full cosmological context until z=0. We vary the angular momentum and density profiles of the initial gas...
Source: http://arxiv.org/abs/1203.1190v2
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In this paper we obtain new properties of a signal generated by the Riemann zeta-function on the critical line. At the same time we obtain an asymptotic formula for a new class of transcendental integrals connected with the Riemann zeta-function.
Source: http://arxiv.org/abs/1203.0159v1
Arxiv.org
by Jong-Phil Lee
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The superradiant scattering of massive scalar particles by a rotating mini black hole is investigated. Imposing the mirror boundary condition, the system becomes the so called black-hole bomb where the rotation energy of the black hole is transferred to the scattered particle exponentially with time. Bulk emissions as well as brane emissions are considered altogether. It is found that the largest effects are expected for the brane emission of lower angular modes with lighter mass and larger...
Source: http://arxiv.org/abs/1107.5641v2
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by Weiyu Xu; Alex Dimakis; Babak Hassibi
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In this paper, we study the mixing time of Markov Chain Monte Carlo (MCMC) for integer least-square (LS) optimization problems. It is found that the mixing time of MCMC for integer LS problems depends on the structure of the underlying lattice. More specifically, the mixing time of MCMC is closely related to whether there is a local minimum in the lattice structure. For some lattices, the mixing time of the Markov chain is independent of the signal-to-noise ($SNR$) ratio and grows polynomially...
Source: http://arxiv.org/abs/1203.2213v1
Deb Cotton Secondline Collection
by BigRedCotton
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featuring TBC Brass Band Source: https://www.youtube.com/watch?v=KgPPMyb3MU0 Uploader: BigRedCotton Upload date: 20121116
Topics: Youtube, video, Music, Second line, brass band, parade, New Orleans, jazz, brass music, live music...
L-R: Bill Schaupp, Ben Smith and Keith Sprengel talking with Dave Bridgwater (seated). Forest Health Protection tech meeting. Region 6 Regional Office. Portland, Oregon. Photo by: Julie Johnson Date: November 7, 2012 Credit: USDA Forest Service, Region 6, State and Private Forestry, Forest Health Protection. Source: Aerial Survey Program collection. Image provided by USDA Forest Service, Region 6, State and Private Forestry, Forest Health Protection:...
Topics: foresthealthprotection, usda, Aerial Detection Surveys, stateandprivateforestry, regionaloffice,...
Arxiv.org
by H. Bruntt; S. Basu; B. Smalley; W. J. Chaplin; G. A. Verner; T. R. Bedding; C. Catala; J. -C. Gazzano; J. Molenda-Zakowicz; A. O. Thygesen; K. Uytterhoeven; S. Hekker; D. Huber; C. Karoff; S. Mathur; B. Mosser; T. Appourchaux; T. L. Campante; Y. Elsworth; R. A. Garcia; R. Handberg; T. S. Metcalfe; P. -O. Quirion; C. Regulo; I. W. Roxburgh; D. Stello; J. Christensen-Dalsgaard; S. D. Kawaler; H. Kjeldsen; R. L. Morris; E. V. Quintana; D. T. Sanderfer
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We present a detailed spectroscopic study of 93 solar-type stars that are targets of the NASA/Kepler mission and provide detailed chemical composition of each target. We find that the overall metallicity is well-represented by Fe lines. Relative abundances of light elements (CNO) and alpha-elements are generally higher for low-metallicity stars. Our spectroscopic analysis benefits from the accurately measured surface gravity from the asteroseismic analysis of the Kepler light curves. The log g...
Source: http://arxiv.org/abs/1203.0611v1
Arxiv.org
by M. P. Garcia del Moral; J. M. Pena; A. Restuccia
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The M-theory origin of the IIB gauged supergravities in nine dimensions, classified according to the inequivalent classes of monodromy, is shown to exactly corresponds to the global description of the supermembrane with central charges. The global description is a realization of the sculpting mechanism of gauging (arXiv:1107.3255) and it is associated to particular deformation of fibrations. The supermembrane with central charges may be formulated in terms of sections on symplectic torus...
Source: http://arxiv.org/abs/1203.2767v2