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playing Nagin -part 2. New Orleans rolls hard - water don't stop us! Source: https://www.youtube.com/watch?v=AVrr9krKyc8 Uploader: BigRedCotton Upload date: 20120227
Topics: Youtube, video, News & Politics, TBC Brass Band, To Be Continued Brass Band, New Orleans,...
Arxiv.org
by Emmanuel Candes; Carlos Fernandez-Granda
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This paper develops a mathematical theory of super-resolution. Broadly speaking, super-resolution is the problem of recovering the fine details of an object---the high end of its spectrum---from coarse scale information only---from samples at the low end of the spectrum. Suppose we have many point sources at unknown locations in $[0,1]$ and with unknown complex-valued amplitudes. We only observe Fourier samples of this object up until a frequency cut-off $f_c$. We show that one can...
Source: http://arxiv.org/abs/1203.5871v3
Community Audio
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Arxiv.org
by Curtis Menton
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We study the behavior of Range Voting and Normalized Range Voting with respect to electoral control. Electoral control encompasses attempts from an election chair to alter the structure of an election in order to change the outcome. We show that a voting system resists a case of control by proving that performing that case of control is computationally infeasible. Range Voting is a natural extension of approval voting, and Normalized Range Voting is a simple variant which alters each vote to...
Source: http://arxiv.org/abs/1005.5698v3
Arxiv.org
by Steven W. Peters; Robert W. Heath Jr
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This paper presents a study on multiple-antenna interference channels, accounting for general overhead as a function of the number of users and antennas in the network. The model includes both perfect and imperfect channel state information based on channel estimation in the presence of noise. Three low complexity methods are proposed for reducing the impact of overhead in the sum network throughput by partitioning users into orthogonal groups. The first method allocates spectrum to the groups...
Source: http://arxiv.org/abs/1007.0512v2
Arxiv.org
by A. V. Kuznetsov; N. V. Mikheev; A. V. Serghienko
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The low-energy manifestations of a minimal extension of the electroweak standard model based on the quark-lepton symmetry $SU(4)_V \otimes SU(2)_L \otimes G_R$ of the Pati--Salam type are analyzed. Given this symmetry the third type of mixing in the interactions of the $SU(4)_V$ leptoquarks with quarks and leptons is shown to be required. An additional arbitrariness of the mixing parameters could allow, in principle, to decrease noticeably the lower bound on the vector leptoquark mass...
Source: http://arxiv.org/abs/1203.0196v2
Arxiv.org
by Antoine Hakassou; Youssef Ouknine
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In this note, we introduce the notion of $\alpha$-IDT processes which is obtained from a slight and fundamental modification of the IDT property. Several examples of $\alpha$-IDT processes are given and Gaussian processes which are $\alpha$-IDT are characterized. A kind example of this Gaussian $\alpha$-IDT is the standard fractional Brownian motion. Also, we invest some links between the $\alpha$-IDT property, with selfdecomposability, temporal selfdecomposability, stability and self...
Source: http://arxiv.org/abs/1203.0874v3
Arxiv.org
by Mircea Mustata; Karl Schwede
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We define and study a version of Seshadri constant for ample line bundles in positive characteristic. We prove that lower bounds for this constant imply the global generation or very ampleness of the corresponding adjoint line bundle. As a consequence, we deduce that the criterion for global generation and very ampleness of adjoint line bundles in terms of usual Seshadri constants holds also in positive characteristic.
Source: http://arxiv.org/abs/1203.1081v1
Arxiv.org
by Miguel Abreu; Matthew Strom Borman; Dusa McDuff
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In this paper we introduce a new way of displacing Lagrangian fibers in toric symplectic manifolds, a generalization of McDuff's original method of probes. Extended probes are formed by deflecting one probe by another auxiliary probe. Using them, we are able to displace all fibers in Hirzebruch surfaces except those already known to be nondisplaceable, and can also displace an open dense set of fibers in the weighted projective space P(1,3,5) after resolving the singularities. We also...
Source: http://arxiv.org/abs/1203.1074v2
Arxiv.org
by M. Kowal; J. Skalski
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We study the existence of third, hyperdeformed minima in a number of even-even Th, U and Pu nuclei using the Woods-Saxon microscopic-macroscopic model that very well reproduces first and second minima and fission barriers in actinides. Deep ($3 \div 4$ MeV) minima found previously by \'Cwiok et al. are found spurious after sufficiently general shapes are included. Shallow third wells may exist in $^{230,232}$Th, with IIIrd barriers $\le$ 200 and 330 keV (respectively). Thus, a problem of...
Source: http://arxiv.org/abs/1203.4449v1
Arxiv.org
by Machiko Hatsuda; Tetsuji Kimura
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We present an extension of the Courant bracket to the ones for Dp-branes by analyzing Hamiltonians and local superalgebras. Contrast to the basis of the bracket for a fundamental string which consists of the momentum and the winding modes, the ones for Dp-branes contain higher rank R-R coupling tensors. We show that the R-R gauge transformation rules are obtained by these Courant brackets for Dp-branes where the Dirac-Born-Infeld gauge field and the "two-vierbein field" play an...
Source: http://arxiv.org/abs/1203.5499v4
Deb Cotton Secondline Collection
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Source: https://www.youtube.com/watch?v=frAoo6rnO64 Uploader: BigRedCotton Upload date: 20120413
Topics: Youtube, video, Music, Rebirth Brass Band, New Orleans, Second Line parade, Stooges Brass Band,...
Arxiv.org
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We prove the differential family index theorem by the flat family index theorem and the differential Grothendieck-Riemann-Roch theorem.
Source: http://arxiv.org/abs/1203.5383v3
Arxiv.org
by Eiichi Bannai; Etsuko Bannai; Junichi Shigezumi
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We give a new example of Euclidean tight 6-design in $\mathbb R^{22}$.
Source: http://arxiv.org/abs/1005.4987v2
Arxiv.org
by Antonio Leon
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This paper examines the consistency of w-order by means of a supertask that functions as a supertrap for the assumed existence of w-ordered collections, which are simultaneously complete (as is required by the Actual infinity) and uncompletable (because no last element completes them).
Source: http://arxiv.org/abs/0804.2939v2
Arxiv.org
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A new family of restricted post-Newtonian-accurate waveforms, termed TaylorEt approximants, was recently proposed for searching gravitational wave (GW) signals from inspiraling non-spinning compact binaries having arbitrary mass-ratios. We perform detailed fitting factor (FF) studies to probe if the TaylorEt (3.5PN) signals for non-spinning comparable mass compact binaries can be effectually and faithfully searched with TaylorT1, TaylorT4, and TaylorF2 (3.5PN) templates in LIGO, Advanced LIGO,...
Source: http://arxiv.org/abs/0807.2400v2
Arxiv.org
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In this paper, we shall establish a Dancer-type unilateral global bifurcation result for a class of quasilinear elliptic problems with sign-changing weight. Under some natural hypotheses on perturbation function, we show that $(\mu_k^\nu(p),0)$ is a bifurcation point of the above problems and there are two distinct unbounded continua, $(\mathcal{C}_{k}^\nu)^+$ and $(\mathcal{C}_{k}^\nu)^-$, consisting of the bifurcation branch $\mathcal{C}_{k}^\nu$ from $(\mu_k^\nu(p), 0)$, where $\mu_k^\nu(p)$...
Source: http://arxiv.org/abs/1203.3262v1
Arxiv.org
by Vasily Galkin
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The original F5 algorithm introduced by Faug\`ere is formulated for any homogeneous polynomial set input. The correctness of output is shown for any input that terminates the algorithm, but the termination itself is proved only for the case of input being regular polynomial sequence. This article shows that algorithm correctly terminates for any homogeneous input without any reference to regularity. The scheme contains two steps: first it is shown that if the algorithm does not terminate it...
Source: http://arxiv.org/abs/1203.2402v3
Arxiv.org
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In this note, we extend our previous work on the inverse $\sigma_k$ problem. Inverse $\sigma_{k}$ problem is a fully nonlinear geometric PDE on compact K\"ahler manifolds. Given a proper geometric condition, we prove that a large family of nonlinear geometric flows converges to the desired solution of the given PDE.
Source: http://arxiv.org/abs/1203.2571v1
Arxiv.org
by Morishige Yoneda; Masaaki Niwa; Mitsuya Motohashi
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We have constructed a theory of dual canonical formalism to study the quantum competing systems. In such a system, as the relationship between current and voltage of each, we assumed the duality conditions. We considered competing system of two types. One type of these system are composed of the sandwich structure by SC(superconductor)/SI(superinsulator)/SC junction, and its dual junction is consists of the sandwich structure by SI/SC/SI junction. Another one type of these system is consists of...
Source: http://arxiv.org/abs/1203.3281v3
Arxiv.org
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In complex systems, the interplay between nonlinear and stochastic dynamics, e.g., J. Monod's necessity and chance, gives rise to an evolutionary process in Darwinian sense, in terms of discrete jumps among attractors, with punctuated equilibrium, spontaneous random "mutations" and "adaptations". On an evlutionary time scale it produces sustainable diversity among individuals in a homogeneous population rather than convergence as usually predicted by a deterministic...
Source: http://arxiv.org/abs/1203.3554v2
Arxiv.org
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We analyze the evolution of the Gaussian discord between two resonant harmonic oscillators coupled to a common environment. For this, we use the same tools we applied before to fully characterize the evolution of the entanglement in this system [ Phys. Rev. Lett. 100 220401 (2008)]. The asymptotic value of Gaussian discord is obtained as a function of parameters characterizing the environment (temperature, couplings, etc.) and the initial state of the system (initial squeezing, initial purity,...
Source: http://arxiv.org/abs/1203.3819v1
Arxiv.org
by Adrien Kassel; Richard Kenyon; Wei Wu
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We compute the asymptotics of the first and second moments of the area of the cycle of a random cycle-rooted spanning tree (spanning unicycle) of any sequence of graphs $G_n\subset {\mathbb Z}^2$, such that $\frac{1}{n}G_n$ approximates a bounded domain $D\subset{\mathbb C}$. We show that the first and second moments grow like $\frac{4}{\pi}\log n$ and $C\cdot\text{Area}(D)n^2$, respectively, for an explicit constant $C=C(D)$. We use these results to give a lower bound for the first and third...
Source: http://arxiv.org/abs/1203.4858v1
Arxiv.org
by Ismael Fortuna; Gilberto L. Thomas; Rita M. C. de Almeida; Francois Graner
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We study the topology and geometry of two dimensional coarsening foams with arbitrary liquid fraction. To interpolate between the dry limit described by von Neumann's law, and the wet limit described by Marqusee equation, the relevant bubble characteristics are the Plateau border radius and a new variable, the e?ective number of sides. We propose an equation for the individual bubble growth rate as the weighted sum of the growth through bubble-bubble interfaces and through bubble-Plateau...
Source: http://arxiv.org/abs/1203.5834v2
Arxiv.org
by M. H. M. Morais; A. C. M. Correia
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The radial velocity method for detecting extra-solar planets relies on measuring the star's wobble around the system's center of mass. Since this is an indirect method, we may ask if there are other dynamical effects that can mimic such wobble. In recent articles\cite{1,2,3}, we modeled the effect of a nearby binary system on a star's radial velocity. We showed that, if we are unaware of this nearby binary, for instance because one component is unresolved or both components are faint stars, the...
Source: http://arxiv.org/abs/1203.6078v1
Arxiv.org
by Jozsef Balogh; Jesus Leanos; Gelasio Salazar
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Richter and Thomassen proved that every graph has an edge $e$ such that the crossing number $\ucr(G-e)$ of $G-e$ is at least $(2/5)\ucr(G) - O(1)$. Fox and Cs. T\'oth proved that dense graphs have large sets of edges (proportional in the total number of edges) whose removal leaves a graph with crossing number proportional to the crossing number of the original graph; this result was later strenghtened by \v{C}ern\'{y}, Kyn\v{c}l and G. T\'oth. These results make our understanding of the {decay}...
Source: http://arxiv.org/abs/1203.0510v1
Arxiv.org
by Ashwin Guha; Ambedkar Dukkipati
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In this paper we consider polynomial representability of functions defined over Z_{p^n}, where p is a prime and n is a positive integer. Our aim is to provide an algorithmic characterization that answers the decision problem: to determine whether a given function over Z_{p^n} is polynomially representable or not. The previous characterizations given by Carlitz (1964) and Kempner (1921) are existential in nature and only lead to an exhaustive search method, i.e. algorithm with complexity...
Source: http://arxiv.org/abs/1203.1122v3
Arxiv.org
by Kristoffer Arnsfelt Hansen; Rasmus Ibsen-Jensen; Peter Bro Miltersen
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Two standard algorithms for approximately solving two-player zero-sum concurrent reachability games are value iteration and strategy iteration. We prove upper and lower bounds of 2^(m^(Theta(N))) on the worst case number of iterations needed by both of these algorithms for providing non-trivial approximations to the value of a game with N non-terminal positions and m actions for each player in each position. In particular, both algorithms have doubly-exponential complexity. Even when the game...
Source: http://arxiv.org/abs/1007.1812v3
Arxiv.org
texts

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Baryon number cumulants are invaluable tools to diagnose the primordial stage of heavy ion collisions if they can be measured. In experiments, however, proton number cumulants have been measured as substitutes. In fact, proton number fluctuations are further modified in the hadron phase and different from those of baryon number. We show that the isospin distribution of nucleons at kinetic freezeout is binomial and factorized. This leads to formulas that express the baryon number cumulants...
Source: http://arxiv.org/abs/1107.2755v2
Arxiv.org
by Claude Brezinski; Michela Redivo-Zaglia
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In this paper, we consider the particular case of the general rational Hermite interpolation problem where only the value of the function is interpolated at some points, and where the function and its first derivatives agree at the origin. Thus, the interpolants constructed in this way possess a Pad\'e--type property at 0. Numerical examples show the interest of the procedure. The interpolation procedure can be easily modified to introduce a partial knowledge on the poles and the zeros of the...
Source: http://arxiv.org/abs/1107.4854v3
Arxiv.org
by Ignatios Antoniadis; George Savvidy
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The BCFW recursion relation allows to find out the tree-level scattering amplitudes for gluons and tensor gauge bosons in generalized Yang-Mills theory. We demonstrate that the corresponding MHV amplitudes for the tensor gauge bosons of spin-s and n gluons are invariant under conformal group transformations. We discuss and compare the tree-level scattering amplitudes for the charged tensor bosons with the corresponding scattering amplitudes for gravitons, stressing their differences and...
Source: http://arxiv.org/abs/1107.4997v2
Arxiv.org
by L. Dorame; S. Morisi; E. Peinado; Alma D. Rojas; J. W. F. Valle
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A class of discrete flavor-symmetry-based models predicts constrained neutrino mass matrix schemes that lead to specific neutrino mass sum-rules (MSR). One of these implies in a lower bound on the effective neutrinoless double beta mass parameter, even for normal hierarchy neutrinos. Here we propose a new model based on the S4 flavor symmetry that leads to the new neutrino mass sum-rule and discuss how to generate a nonzero value for the reactor mixing angle indicated by recent experiments, and...
Source: http://arxiv.org/abs/1203.0155v1
Arxiv.org
by Octavio Miramontes; Og DeSouza; Diego Hernández; Eliane Ceccon
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We measured mobility patterns that describe walking trajectories of individual Me'Phaa peasants searching and collecting fuelwood in the forests of "La Monta\~na de Guerrero" in Mexico. These one-day excursions typically follow a mixed pattern of nearly-constant steps when individuals displace from their homes towards potential collecting sites and a mixed pattern of steps of different lengths when actually searching for fallen wood in the forest. Displacements in the searching phase...
Source: http://arxiv.org/abs/1203.0971v1
Arxiv.org
by Ali Fardoun; Rachid Regbaoui
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We prove the uniqueness of solutions to Dirichlet problem for p-harmonic maps with images in a small geodesic ball of the target manifold. As a consequence, we show that such maps have Hoelder continuous derivatives. This gives an extension of a result by S. Hildebrandt et al concerning harmonic maps.
Source: http://arxiv.org/abs/1203.2101v1
Arxiv.org
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We introduce a principal support vector machine (PSVM) approach that can be used for both linear and nonlinear sufficient dimension reduction. The basic idea is to divide the response variables into slices and use a modified form of support vector machine to find the optimal hyperplanes that separate them. These optimal hyperplanes are then aligned by the principal components of their normal vectors. It is proved that the aligned normal vectors provide an unbiased, $\sqrt{n}$-consistent, and...
Source: http://arxiv.org/abs/1203.2790v1
Arxiv.org
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We analyse the structure of imprecise Markov chains and study their convergence by means of accessibility relations. We first identify the sets of states, so-called minimal permanent classes, that are the minimal sets capable of containing and preserving the whole probability mass of the chain. These classes generalise the essential classes known from the classical theory. We then define a class of extremal imprecise invariant distributions and show that they are uniquely determined by the...
Source: http://arxiv.org/abs/1203.3088v2
Arxiv.org
by K. T. Schmitt; K. L. Jones; A. Bey; S. H. Ahn; D. W. Bardayan; J. C. Blackmon; S. M. Brown; K. Y. Chae; K. A. Chipps; J. A. Cizewski; K. I. Hahn; J. J. Kolata; R. L. Kozub; J. F. Liang; C. Matei; M. Matoš; D. Matyas; B. Moazen; C. Nesaraja; F. M. Nunes; P. D. O'Malley; S. D. Pain; W. A. Peters; S. T. Pittman; A. Roberts; D. Shapira; J. F. Shriner Jr; M. S. Smith; I. Spassova; D. W. Stracener; A. N. Villano; G. L. Wilson
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The best examples of halo nuclei, exotic systems with a diffuse nuclear cloud surrounding a tightly-bound core, are found in the light, neutron-rich region, where the halo neutrons experience only weak binding and a weak, or no, potential barrier. Modern direct reaction measurement techniques provide powerful probes of the structure of exotic nuclei. Despite more than four decades of these studies on the benchmark one-neutron halo nucleus Be-11, the spectroscopic factors for the two bound...
Source: http://arxiv.org/abs/1203.3081v2
Arxiv.org
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We consider the effect of the wind and the dissipation on the nonlinear stages of the modulational instability. By applying a suitable transformation, we map the forced/damped Nonlinear Schr\"odinger (NLS) equation into the standard NLS with constant coefficients. The transformation is valid as long as |{\Gamma}t| \ll 1, with {\Gamma} the growth/damping rate of the waves due to the wind/dissipation. Approximate rogue wave solutions of the equation are presented and discussed. The results...
Source: http://arxiv.org/abs/1203.4735v1
Arxiv.org
by Takeshi Araki; Julian Heeck; Jisuke Kubo
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Augmenting the Standard Model by three right-handed neutrinos allows for an anomaly-free gauge group extension G_max = U(1)_(B-L) x U(1)_(L_e-L_mu) x U(1)_(L_mu-L_tau). While simple U(1) subgroups of G_max have already been discussed in the context of approximate flavor symmetries, we show how two-zero textures in the right-handed neutrino Majorana mass matrix can be enforced by the flavor symmetry, which is spontaneously broken very economically by singlet scalars. These zeros lead to two...
Source: http://arxiv.org/abs/1203.4951v2
Arxiv.org
by Nicola Perra; Bruno Gonçalves; Romualdo Pastor-Satorras; Alessandro Vespignani
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Network modeling plays a critical role in identifying statistical regularities and structural principles common to many systems. The large majority of recent modeling approaches are connectivity driven. The structural patterns of the network are at the basis of the mechanisms ruling the network formation. Connectivity driven models necessarily provide a time-aggregated representation that may fail to describe the instantaneous and fluctuating dynamics of many networks. We address this challenge...
Source: http://arxiv.org/abs/1203.5351v4
Arxiv.org
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It has been shown that solutions of a number of many-body problems out of equilibrium can be expressed in terms of Toeplitz determinants with Fisher-Hartwig (FH) singularities. In the present paper, such Toeplitz determinants are studied numerically. Results of our numerical calculations fully agree with the FH conjecture in an extended form that includes a summation over all FH representations (corresponding to different branches of the logarithms). As specific applications, we consider...
Source: http://arxiv.org/abs/1203.6418v1
Deb Cotton Secondline Collection
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Maze's 'Silky Soul Singer' and Rebirth's 'Keep It Funky' Source: https://www.youtube.com/watch?v=O0sQq9YgMms Uploader: BigRedCotton Upload date: 20120924
Topics: Youtube, video, Entertainment, Untouchables, New Orleans, debcotton, debcottonsecondlinecollection,...
Arxiv.org
by Renan Cabrera; Denys I. Bondar; Herschel A. Rabitz
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The relativistic Wigner function for spin 1/2 particles is the subject of active research due to diverse applications. However, further progress is hindered by the fabulous complexity of the integro-differential equations of motion. We simplify these equations to partial differential equations of the Dirac type that are not only well suited for numerical computation, but also posses a well defined classical limit in a manifestly covariant form.
Source: http://arxiv.org/abs/1107.5139v2
Arxiv.org
by Stanislav S. Shabala; Yuan-Sen Ting; Sugata Kaviraj; Chris Lintott; R. Mark Crockett; Joseph Silk; Marc Sarzi; Kevin Schawinski; Steven P. Bamford; Edd Edmondson
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We present the second of two papers concerning the origin and evolution of local early-type galaxies exhibiting dust features. We use optical and radio data to examine the nature of active galactic nucleus (AGN) activity in these objects, and compare these with a carefully constructed control sample. We find that dust lane early-type galaxies are much more likely to host emission-line AGN than the control sample galaxies. Moreover, there is a strong correlation between radio and emission-line...
Source: http://arxiv.org/abs/1107.5310v3
Arxiv.org
by Hiroshi Miki; Satoshi Tsujimoto; Luc Vinet; Alexei Zhedanov
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An interpretation of the multiple Meixner polynomials of the first kind is provided through an infinite Lie algebra realized in terms of the creation and annihilation operators of a set of independent oscillators. The model is used to derive properties of these orthogonal polynomials.
Source: http://arxiv.org/abs/1203.0357v1
Arxiv.org
by J. A. Hanks; A. M. Sickles; B. A. Cole; A. Franz; M. P. McCumber; D. P. Morrison; J. L. Nagle; C. H. Pinkenburg; B. Sahlmueller; P. Steinberg; M. von Steinkirch; M. Stone
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Reconstructed jets in heavy ion collisions are a crucial tool for understanding the quark-gluon plasma. The separation of jets from the underlying event is necessary particularly in central heavy ion reactions in order to quantify medium modifications of the parton shower and the response of the surrounding medium itself. There have been many methods proposed and implemented for studying the underlying event substructure in proton-proton and heavy ion collisions. In this paper, we detail a...
Source: http://arxiv.org/abs/1203.1353v2
Arxiv.org
by Daniel Grieger; Christoph Piefke; Oleg E. Peil; Frank Lechermann
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Examining phase stabilities and phase equilibria in strongly correlated materials asks for a next level in the many-body extensions to the local-density approximation (LDA) beyond mainly spectroscopic assessments. Here we put the charge-self-consistent LDA+dynamical mean-field theory (DMFT) methodology based on projected local orbitals for the LDA+DMFT interface and a tailored pseudopotential framework into action in order to address such thermodynamics of realistic strongly correlated systems....
Source: http://arxiv.org/abs/1203.5354v2
Arxiv.org
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The physics of self-sustained oscillations in the phenomenon of positive glow corona is presented. The dynamics of charged-particle oscillation under static electric field has been briefly outlined; and, the resulting self-sustained current oscillations in the electrodes have been compared with the measurements from the positive glow corona experiments. The profile of self-sustained electrode current oscillations predicted by the presented theory qualitatively agrees with the experimental...
Source: http://arxiv.org/abs/1203.6377v4
Source: https://www.youtube.com/watch?v=MEQ06RVudOU Uploader: BigRedCotton Upload date: 20120924
Topics: Youtube, video, Entertainment, Untouchables, New Orleans, debcotton, debcottonsecondlinecollection,...
Arxiv.org
by Jacob B. Simon; Kris Beckwith; Philip J. Armitage
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We study how the structure and variability of magnetohydrodynamic (MHD) turbulence in accretion discs converge with domain size. Our results are based on a series of vertically stratified local simulations, computed using the Athena code, that have fixed spatial resolution, but varying radial and azimuthal extent (from \Delta R = 0.5H to 16H, where H is the vertical scale height). We show that elementary local diagnostics of the turbulence, including the Shakura-Sunyaev {\alpha} parameter, the...
Source: http://arxiv.org/abs/1203.0314v1
Arxiv.org
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Bowman and Bradley proved an explicit formula for the sum of multiple zeta values whose indices are the sequence (3,1,3,1,...,3,1) with a number of 2's inserted. Kondo, Saito and Tanaka considered the similar sum of multiple zeta-star values and showed that this value is a rational multiple of a power of \pi. In this paper, we give an explicit formula for the rational part. In addition, we interpret the result as an identity in the harmonic algebra.
Source: http://arxiv.org/abs/1203.1111v1
Arxiv.org
by Michael Holst; Sara Pollock; Yunrong Zhu
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In this article we develop convergence theory for a class of goal-oriented adaptive finite element algorithms for second order semilinear elliptic equations. We first introduce several approximate dual problems, and briefly discuss the target problem class. We then review some standard facts concerning conforming finite element discretization and error-estimate-driven adaptive finite element methods (AFEM). We include a brief summary of a priori estimates for semilinear problems, and then...
Source: http://arxiv.org/abs/1203.1381v2
Arxiv.org
by Lapo Casetti; Cesare Nardini
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Self-gravitating systems, like globular clusters or elliptical galaxies, are the prototypes of many-body systems with long-range interactions, and should be the natural arena where to test theoretical predictions on the statistical behaviour of long-range-interacting systems. Systems of classical self-gravitating particles can be studied with the standard tools of equilibrium statistical mechanics, provided the potential is regularized at small length scales and the system is confined in a box....
Source: http://arxiv.org/abs/1203.1284v1
Arxiv.org
by A. A. Shanenko; M. D. Croitoru; A. V. Vagov; V. M. Axt; A. Perali; F. M. Peeters
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Quantum-size oscillations of the basic physical characteristics of a confined fermionic condensate are a well-known phenomenon. Its conventional understanding is based on the single-particle physics, whereby the oscillations follow the size-dependent changes in the single-particle density of states. Here we present a study of a cigar-shaped ultracold superfluid Fermi gas, which demonstrates an important many-body aspect of the quantum-size effects, overlooked previously. The many-body physics...
Source: http://arxiv.org/abs/1203.3325v2
Arxiv.org
by Vipul Kakkar; R. P. Shukla
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In this paper we prove that there does not exist a subgroup $H$ of a finite group $G$ such that the number of isomorphism classes of normalized right transversals of $H$ in $G$ is four.
Source: http://arxiv.org/abs/1203.6210v1
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The implementation of reliable and efficient geometric algorithms is a challenging task. The reason is the following conflict: On the one hand, computing with rounded arithmetic may question the reliability of programs while, on the other hand, computing with exact arithmetic may be too expensive and hence inefficient. One solution is the implementation of controlled perturbation algorithms which combine the speed of floating-point arithmetic with a protection mechanism that guarantees...
Source: http://arxiv.org/abs/1203.6464v1
Forest Health Protection tech meeting. Region 6 Regional Office. Portland, Oregon. Photo by: Julie Johnson Date: November 6, 2012 Credit: USDA Forest Service, Region 6, State and Private Forestry, Forest Health Protection. Source: Aerial Survey Program collection. Image provided by USDA Forest Service, Region 6, State and Private Forestry, Forest Health Protection: www.fs.usda.gov/main/r6/forest-grasslandhealth
Topics: liaspiegel, dougdaoust, foresthealthprotection, usda, stateandprivateforestry, Meetings,...
Forest Health Protection tech meeting. Region 6 Regional Office. Portland, Oregon. Photo by: Julie Johnson Date: November 6, 2012 Credit: USDA Forest Service, Region 6, State and Private Forestry, Forest Health Protection. Source: Aerial Survey Program collection. Image provided by USDA Forest Service, Region 6, State and Private Forestry, Forest Health Protection: www.fs.usda.gov/main/r6/forest-grasslandhealth
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Visitor David Bridgwater talking with Bill Schaupp. Forest Health Protection tech meeting. Region 6 Regional Office. Portland, Oregon. Photo by: Julie Johnson Date: November 7, 2012 Credit: USDA Forest Service, Region 6, State and Private Forestry, Forest Health Protection. Source: Aerial Survey Program collection. Image provided by USDA Forest Service, Region 6, State and Private Forestry, Forest Health Protection: www.fs.usda.gov/main/r6/forest-grasslandhealth
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by Rui Albuquerque
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We give a brief presentation of gwistor space, which is a new concept from G_2 geometry. Then we compute the characteristic torsion T^c of the gwistor space of an oriented Riemannian 4-manifold with constant sectional curvature k and deduce the condition under which T^c is \nabla^c-parallel; this allows for the classification of the G_2 structure with torsion and the characteristic holonomy according to known references. The case with the Einstein base manifold is envisaged.
Source: http://arxiv.org/abs/1107.5357v2
Arxiv.org
by Gonzalo A. Alvarez; Alexandre M. Souza; Dieter Suter
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The loss of quantum information due to interaction with external degrees of freedom, which is known as decoherence, remains one of the main obstacles for large-scale implementations of quantum computing. Accordingly, different measures are being explored for reducing its effect. One of them is dynamical decoupling (DD) which offers a practical solution because it only requires the application of control pulses to the system qubits. Starting from basic DD sequences, more sophisticated schemes...
Source: http://arxiv.org/abs/1203.0252v1
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The Generalized Traveling Salesman Problem (GTSP) is a well-known combinatorial optimization problem with a host of applications. It is an extension of the Traveling Salesman Problem (TSP) where the set of cities is partitioned into so-called clusters, and the salesman has to visit every cluster exactly once. While the GTSP is a very important combinatorial optimization problem and is well studied in many aspects, the local search algorithms used in the literature are mostly basic adaptations...
Source: http://arxiv.org/abs/1005.5525v4
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by Cecilia Cavaterra; Elisabetta Rocca
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The present contribution investigates the well-posedness of a PDE system describing the evolution of a nematic liquid crystal flow under kinematic transports for molecules of different shapes. More in particular, the evolution of the {\em velocity field} $\ub$ is ruled by the Navier-Stokes incompressible system with a stress tensor exhibiting a special coupling between the transport and the induced terms. The dynamic of the {\em director field} $\bd$ is described by a variation of a parabolic...
Source: http://arxiv.org/abs/1107.3947v2
Source: https://www.youtube.com/watch?v=_qw3smAjeIk Uploader: BigRedCotton Upload date: 20120413
Topics: Youtube, video, Music, Rebirth Brass Band, New Orleans, Second Line parade, Stooges Brass Band,...
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by Muhammad Usman; Vittorianna Tasco; Maria Teresa Todaro; Milena De Giorgi; Eoin P. O'Reilly; Gerhard Klimeck; Adriana Passaseo
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III-V growth and surface conditions strongly influence the physical structure and resulting optical properties of self-assembled quantum dots (QDs). Beyond the design of a desired active optical wavelength, the polarization response of QDs is of particular interest for optical communications and quantum information science. Previous theoretical studies based on a pure InAs QD model failed to reproduce experimentally observed polarization properties. In this work, multi-million atom simulations...
Source: http://arxiv.org/abs/1203.3855v1
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by S. R. Elliott; B. H. LaRoque; V. M. Gehman; M. F. Kidd; M. Chen
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We have examined the atomic theory behind recent constraints on the violation of the Pauli Exclusion Principle derived from experiments that look for x rays emitted from conductors while a large current is present. We also re-examine the assumptions underlying such experiments. We use the results of these studies to assess pilot measurements to develop an improved test of the Principle. We present an improved limit of $(1/2)\beta^2 < 2.6\times10^{-39}$ on the Pauli Exclusion Principle. This...
Source: http://arxiv.org/abs/1107.3118v2
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by Jean-Philippe Michel
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We develop a new approach, based on quantization methods, to study higher symmetries of invariant differential operators. We focus here on conformally invariant powers of the Laplacian over a conformally flat manifold, and recover results of Eastwood, Leistner, Gover and Silhan. In particular, conformally equivariant quantization establishes a crystal clear correspondence between hamiltonian symmetries of the null geodesic flow and the algebra of higher symmetries of the conformal Laplacian....
Source: http://arxiv.org/abs/1107.5840v3
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We consider the synthesis of control policies for probabilistic systems, modeled by Markov decision processes, operating in partially known environments with temporal logic specifications. The environment is modeled by a set of Markov chains. Each Markov chain describes the behavior of the environment in each mode. The mode of the environment, however, is not known to the system. Two control objectives are considered: maximizing the expected probability and maximizing the worst-case probability...
Source: http://arxiv.org/abs/1203.1177v1
Arxiv.org
by Jeffrey C. Smith; Martin C. Stumpe; Jeffrey E. Van Cleve; Jon M. Jenkins; Thomas S. Barclay; Michael N. Fanelli; Forrest R. Girouard; Jeffery J. Kolodziejczak; Sean D. McCauliff; Robert L. Morris; Joseph D. Twicken
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With the unprecedented photometric precision of the Kepler Spacecraft, significant systematic and stochastic errors on transit signal levels are observable in the Kepler photometric data. These errors, which include discontinuities, outliers, systematic trends and other instrumental signatures, obscure astrophysical signals. The Presearch Data Conditioning (PDC) module of the Kepler data analysis pipeline tries to remove these errors while preserving planet transits and other astrophysically...
Source: http://arxiv.org/abs/1203.1383v1
Arxiv.org
by J. de la Cruz Rodríguez; H. Socas-Navarro; M. Carlsson; J. Leenaarts
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The magnetic field of the quiet-Sun chromosphere remains a mystery for solar physicists. The reduced number of chromospheric lines are intrinsically hard to model and only a few of them are magnetically sensitive. In this work, we use a 3D numerical simulation of the outer layers of the solar atmosphere, to asses the reliability of non-LTE inversions, in this case applied to the Ca II 8542 \AA\ line. We show that NLTE inversions provide realistic estimates of physical quantities from synthetic...
Source: http://arxiv.org/abs/1203.4577v1
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by S. H. Lubow; R. G. Martin
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We describe a model for the long term evolution of a circumplanetary disk that is fed mass from a circumstellar disk and contains regions of low turbulence (dead zones). We show that such disks can be subject to accretion driven outbursts, analogous to outbursts previously modeled in the context of circumstellar disks to explain FU Ori phenomena. Circumplanetary disks around a proto-Jupiter can undergo outbursts for infall accretion rates onto the disks in the range ~10^{-9} to 10^{-7}...
Source: http://arxiv.org/abs/1203.6134v1
Occupy Wall Street Flickr Archive
by Lily Rothrock
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Topics: owswest, occupy, occupy wall street, j20, ows, occupysf, protest, san francisco
Source: http://www.flickr.com/photos/lilyrhoads/6734931015/
Occupy Wall Street Flickr Archive
by Lily Rothrock
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Topics: owswest, occupy, occupy wall street, j20, ows, occupysf, protest, san francisco
Source: http://www.flickr.com/photos/lilyrhoads/6734916909/
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A new model to describe the dynamics of particles undergoing diffusion in general relativity is proposed. The evolution of the particle system is described by a Fokker-Planck equation without friction on the tangent bundle of spacetime. It is shown that the energy-momentum tensor for this matter model is not divergence-free, which makes it inconsistent to couple the Fokker-Planck equation to the Einstein equations. This problem can be solved by postulating the existence of additional matter...
Source: http://arxiv.org/abs/1107.4973v3
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by Arash Bodaghee; Farid Rahoui; John A. Tomsick; Jerome Rodriguez
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The Chandra High Resolution Camera observed the fields of five hard X-ray sources in order to help us obtain X-ray coordinates with sub-arcsecond precision. These observations provide the most accurate X-ray positions known for IGR J16393-4643 and for IGR J17091-3624. The obscured X-ray pulsar IGR J16393-4643 lies at R.A. (J2000) = 16:39:05.47, and Dec. = -46:42:13.0 (error radius of 0.6" at 90% confidence). This position is incompatible with the previously-proposed counterpart 2MASS...
Source: http://arxiv.org/abs/1203.0557v2
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by Joseph Y. Halpern; Willemien Kets
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Standard models of multi-agent modal logic do not capture the fact that information is often ambiguous, and may be interpreted in different ways by different agents. We propose a framework that can model this, and consider different semantics that capture different assumptions about the agents' beliefs regarding whether or not there is ambiguity. We consider the impact of ambiguity on a seminal result in economics: Aumann's result saying that agents with a common prior cannot agree to disagree....
Source: http://arxiv.org/abs/1203.0699v1
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by Daniele Bartoli; Stefano Marcugini; Fernanda Pambianco
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In this paper we present the complete classification of caps in PG(5,2). These results have been obtained using a computer based exhaustive search that exploits projective equivalence.
Source: http://arxiv.org/abs/1203.0994v1
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by P. Reig; J. M. Torrejon; P. Blay
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The discovery of very slow pulsations (Pspin=5560s) has solved the long-standing question of the nature of the compact object in the high-mass X-ray binary 4U 2206+54 but has posed new ones. According to spin evolutionary models in close binary systems, such slow pulsations require a neutron star magnetic field strength larger that the quantum critical value, suggesting the presence of a magnetar. We present the first XMM-Newton observations of 4U 2206+54 and investigate its spin evolution. We...
Source: http://arxiv.org/abs/1203.1490v2
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We analyze event-by-event fluctuations of the transverse momentum in relativistic heavy-ion collisions at RHIC in the framework based on the fluctuating Glauber-model initial conditions, event-by-event (3+1)-dimensional viscous hydrodynamics, and statistical hadronization. We use the scaled fluctuation measure < Delta p_Ti Delta p_Tj > / < < p_T >>. The identified "geometric" mechanism of generating the transverse-momentum fluctuations from the initial size...
Source: http://arxiv.org/abs/1203.1810v1
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We consider the differential cross section of electron-positron pair production by a high-energy photon in a strong Coulomb field close to the end of the electron or positron spectrum. When the momentum transfer largely exceeds the electron mass, the cross section is obtained analytically in a compact form. Coulomb corrections essentially modify the cross section even for moderate values of the nuclear charge number $Z$. In the same kinematical region, the angular distribution for bound-free...
Source: http://arxiv.org/abs/1203.2137v1
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by Luca Belluzzi; Javier Trujillo Bueno
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Although the h and k lines of MgII are expected to be of great interest for probing the upper solar chromosphere, relatively little is known about their polarization properties which encode the information on the magnetic field. Here we report the first results of an investigation whose main goal is to understand the physical mechanisms that control the scattering polarization across these resonance lines and to achieve a realistic radiative transfer modeling in the presence of arbitrary...
Source: http://arxiv.org/abs/1203.4351v1
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In this paper, we are concerned with the Cauchy problem for one-dimensional compressible isentropic Navier-Stokes equations with density-dependent viscosity $\mu(\rho)=\rho^\alpha (\alpha>0)$ and pressure $P(\rho)=\rho^{\gamma}\ (\gamma>1)$. We will establish the global existence and asymptotic behavior of weak solutions for any $\alpha>0$ and $\gamma>1$ under the assumption that the density function keeps a constant state at far fields. This enlarges the ranges of $\alpha$ and...
Source: http://arxiv.org/abs/1203.4306v1
Arxiv.org
by Z. Salman; E. Pomjakushina; V. Pomjakushin; A. Kanigel; K. Chashka; K. Conder; E. Morenzoni; T. Prokscha; K. Sedlak; A. Suter
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We present a detailed investigation of the magnetic and structural properties of magnetically doped 3D topological insulator Bi2Se3. From muon spin relaxation measurements in zero magnetic field, we find that even 5% Fe doping on the Bi site turns the full volume of the sample magnetic at temperatures as high as ~250 K. This is also confirmed by magnetization measurements. Two magnetic "phases" are identified; the first is observed between ~10-250 K while the second appears below ~10...
Source: http://arxiv.org/abs/1203.4850v1
Arxiv.org
by Alexandre Refregier; Tomasz Kacprzak; Adam Amara; Sarah Bridle; Barnaby Rowe
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Weak lensing experiments are a powerful probe of cosmology through their measurement of the mass distribution of the universe. A challenge for this technique is to control systematic errors that occur when measuring the shapes of distant galaxies. In this paper we investigate noise bias, a systematic error that arises from second order noise terms in the shape measurement process. We first derive analytical expressions for the bias of general Maximum Likelihood Estimators (MLEs) in the presence...
Source: http://arxiv.org/abs/1203.5050v1
Arxiv.org
by Tanmoy Das; R. S. Markiewicz; A. Bansil; A. V. Balatsky
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Fingerprint of the electron-pocket in cuprates has been obtained only in numerous magneto-transport measurements, but its absence in spectroscopic observations pose a long-standing mystery. We develop a theoretical tool to provide ways to detect electron-pockets via numerous spectroscopies including scanning tunneling microscopy (STM) spectra, inelastic neutron scattering (INS), and angle-resolved photoemission spectroscopy (ARPES). We show that the quasiparticle-interference (QPI) pattern,...
Source: http://arxiv.org/abs/1203.5746v1
We propose an indirect method to observe radiation from an incomplete soliton with sufficiently large amplitude. We show that the radiation causes a notched structure on the envelope of the wave packet in the momentum space. The origin of this structure is a result of interference between the main body of oscillating solitons and the small radiation in the momentum space. We numerically integrate the nonlinear Schr\"odinger equation and perform Fourier transformation to confirm that the...
Source: http://arxiv.org/abs/1203.5907v2
Recently developed series representations of the Boltzmann operator are used to obtain Quantum Mechanical results for the matrix elements, , of the imaginary time propagator. The calculations are done for two different potential surfaces: one of them is an Eckart Barrier and the other one is a double well potential surface. Numerical convergence of the series are investigated. Although the zeroth order term is sufficient at high temperatures, it does not lead to the correct saddle point...
Source: http://arxiv.org/abs/1203.5942v1
Arxiv.org
by Dajun Qian; Osman Yağan; Lei Yang; Junshan Zhang
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We study the diffusion behavior of real-time information. Typically, real-time information is valuable only for a limited time duration, and hence needs to be delivered before its "deadline." Therefore, real-time information is much easier to spread among a group of people with frequent interactions than between isolated individuals. With this insight, we consider a social network which consists of many cliques and information can spread quickly within a clique. Furthermore,...
Source: http://arxiv.org/abs/1203.6122v2
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by Kelly R. Patton; Daniel E. Sheehy
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The induced intraspecies interactions among the majority species, mediated by the minority species, is computed for a population-imbalanced two-component Fermi gas. Although the Feshbach-resonance mediated interspecies interaction is dominant for equal populations, leading to singlet s-wave pairing, we find that in the strongly imbalanced regime the induced intraspecies interaction leads to p-wave pairing and superfluidity of the majority species. Thus, we predict that the observed spin-polaron...
Source: http://arxiv.org/abs/1203.6348v1
Arxiv.org
by Haiyang Niu; Jiaqi Wang; Xing-Qiu Chen; Dianzhong Li; Yiyi Li; Petr Lazar; Raimund Podloucky; Aleksey N. Kolmogorov
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By electron and X-ray diffraction we establish that the CrB$_4$ compound discovered over 40 years ago crystallizes in the $oP10$ (\emph{Pnnm}) structure, in disagreement with previous experiments but in agreement with a recent first-principles prediction. The 3D boron network in the new structure is a distorted version of the rigid carbon $sp^3$ network proposed recently for the high-pressure C$_4$ allotrope. According to our density functional theory calculations and the analysis of the...
Source: http://arxiv.org/abs/1203.6470v1
Arxiv.org
by N. Schneider; T. Csengeri; M. Hennemann; F. Motte; P. Didelon; C. Federrath; S. Bontemps; J. Di Francesco; D. Arzoumanian; V. Minier; Ph. André; T. Hill; A. Zavagno; Q. Nguyen-Luong; M. Attard; J. -Ph. Bernard; D. Elia; C. Fallscheer; M. Griffin; J. Kirk; R. Klessen; V. Könyves; P. Martin; A. Men'shchikov; P. Palmeirim; N. Peretto; M. Pestalozzi; D. Russeil; S. Sadavoy; T. Sousbie; L. Testi; P. Tremblin; D. Ward-Thompson; G. White
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For many years feedback processes generated by OB-stars in molecular clouds, including expanding ionization fronts, stellar winds, or UV-radiation, have been proposed to trigger subsequent star formation. However, hydrodynamic models including radiation and gravity show that UV-illumination has little or no impact on the global dynamical evolution of the cloud. The Rosette molecular cloud, irradiated by the NGC2244 cluster, is a template region for triggered star-formation, and we investigated...
Source: http://arxiv.org/abs/1203.6472v1
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by Soren Galatius; Oscar Randal-Williams
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We prove a homological stability theorem for the moduli spaces of manifolds diffeomorphic to g(S^n x S^n), provided n > 2. This generalises Harer's stability theorem for the homology of mapping class groups. Combined with previous work of the authors, it gives a calculation of the homology of these moduli spaces in a range of degrees.
Source: http://arxiv.org/abs/1203.6830v2
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by A. Bialas; A. Bzdak; K. Zalewski
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Interpretation of long-range rapidity correlations in terms of the fluctuating rapidity density distribution of the system created in high-energy collisions is proposed. When applied to recent data of the STAR coll., it shows a substantial asymmetric component in the shape of this system in central Au-Au collisions, implying that boost invariance is violated on the event-by-event basis even at central rapidity. This effect may seriously influence the hydrodynamic expansion of the system.
Source: http://arxiv.org/abs/1107.1215v2
Arxiv.org
by K. Arisaka; P. Beltrame; C. W. Lam; P. F. Smith; C. Ghag; D. B. Cline; K. Lung; Y. Meng; E. Pantic; P. R. Scovell; A. Teymourian; H. Wang
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We study a three stage dark matter and neutrino observatory based on multi-ton two-phase liquid Xe and Ar detectors with sufficiently low backgrounds to be sensitive to WIMP dark matter interaction cross sections down to 10E-47 cm^2, and to provide both identification and two independent measurements of the WIMP mass through the use of the two target elements in a 5:1 mass ratio, giving an expected similarity of event numbers. The same detection systems will also allow measurement of the pp...
Source: http://arxiv.org/abs/1107.1295v3
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by G. Afendras; N. Papadatos
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Let X be an absolutely continuous random variable from the integrated Pearson family and assume that X has finite moments of any order. Equivalently, X is a linear (non-constant) transformation of Y where Y follows a Normal, a Beta or a Gamma density. Using some properties of the associate orthonormal polynomial system we provide a class of strengthened Chernoff-type variance bounds.
Source: http://arxiv.org/abs/1107.1754v3
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by Tatsuo Kobayashi; Susha L. Parameswaran; Saul Ramos-Sanchez; Ivonne Zavala
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We study L-point couplings between twisted sector fields in heterotic orbifold compactifications, using conformal field theory. Selection rules provide an easy way to identify which couplings are non-vanishing. Those used in the current literature are gauge invariance, R-charge conservation and the space group selection rule, but they are not the whole story. We revive and refine a fourth selection rule, due to symmetries in the underlying torus lattice, and introduce a fifth one, due to the...
Source: http://arxiv.org/abs/1107.2137v3
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by A. B. Larionov; T. Gaitanos; U. Mosel
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We study the strangeness production in antiproton-nucleus collisions at the beam momenta from 200 MeV/c to 15 GeV/c within the Giessen Botzmann-Uehling-Uhlenbeck (GiBUU) transport model. The GiBUU model contains a very detailed description of the underlying antinucleon-nucleon cross sections, in-particular, of the strangeness production channels. We compare our calculations with the bubble chamber data on \Lambda- and K^0_S-production in antiproton-nucleus collisions and with the earlier...
Source: http://arxiv.org/abs/1107.2326v2
Multiple spatial zero formations for Stokes and Navier-Stokes equations in three dimensions are shown to occur according to nodal sets of solenoidal Hermite polynomials. Extensions to well-posed Burnett equations with the bi-harmonic viscosity operator are also discussed.
Source: http://arxiv.org/abs/1107.3045v2
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by Manuel Blickle; Karl Schwede; Kevin Tucker
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For a normal F-finite variety $X$ and a boundary divisor $\Delta$ we give a uniform description of an ideal which in characteristic zero yields the multiplier ideal, and in positive characteristic the test ideal of the pair $(X,\Delta)$. Our description is in terms of regular alterations over $X$, and one consequence of it is a common characterization of rational singularities (in characteristic zero) and F-rational singularities (in characteristic $p$) by the surjectivity of the trace map...
Source: http://arxiv.org/abs/1107.3807v3