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Oct 13, 2017
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Oct 13, 2017
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Ekhtiar, Maryam D. and Claire Moore, ed.
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Lost Landscapes of San Francisco 6 (2011) is the latest in a series of historical urban explorations, made from home movies, industrial and promotional films and outtakes, and other cinematic ephemera. It sold out the Castro Theatre in December, and this will be its second screening. YOU are the soundtrack. Please come prepared to shout out your identifications, ask questions about what’s on the screen, and share your thoughts with fellow audience members. Most of the footage in this program...
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Topics: Rick Prelinger, San Francisco, Internet Archive, Brewster Kahle, Archival movies
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,...
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...
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Gunnar Graef; Qingfeng Li; Marcus Bleicher
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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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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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Galaxy groups are the least massive systems where the bulk of baryons begin to be accounted for. Not simply the scaleddown versions of rich clusters following selfsimilar relations, galaxy groups are ideal systems to study baryon physics, which is important for both cluster cosmology and galaxy formation. We review the recent observational results on the hot gas in galaxy groups. The first part of the paper is on the scaling relations, including Xray luminosity, entropy, gas fraction, baryon...
Source: http://arxiv.org/abs/1203.4228v1
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Kevin Heng; Pushkar Kopparla
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We investigate the stability of super Earth atmospheres around M stars using a 7parameter, analytical framework. We construct stability diagrams in the parameter space of exoplanetary radius versus semimajor axis and elucidate the regions in which the atmospheres are stable against the condensation of their major constituents, out of the gas phase, on their permanent nightside hemispheres. We find that super Earth atmospheres which are nitrogendominated ("Earthlike") occupy a...
Source: http://arxiv.org/abs/1203.1922v3
Sugar pine mortality caused by mountain pine beetles. Siskiyou Mountains, Southwest Oregon. 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 results. Pacific...
Topics: r6, usda, stateandprivateforestry, treedamage, foresthealth, donaldjgoheen, region6, forestdamage,...
Rochelle Desser. 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/forestgrasslandhealth
Topics: foresthealthprotection, usda, stateandprivateforestry, techmeeting, oregon, usfs, r6, forest...
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Consider the following forestfire process on a connected graph. Each site of the graph can be either occupied or vacant. A vacant site becomes occupied with rate 1. A site is ignited with rate lambda, and its whole occupied cluster burns instantaneously. The purpose of this paper is to show the existence of a stationary distribution for forestfire processes on Z^d, for d >= 2. We define a distribution as a limit of a sequence of invariant distributions of finite volume forestfire...
Source: http://arxiv.org/abs/1203.5533v1
Source: https://www.youtube.com/watch?v=fG62uNfolN0 Uploader: BigRedCotton Upload date: 20120923
Topics: Youtube, video, Entertainment, clip, 2012, 09, 23, 12, 01, 29, debcotton,...
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P. S. Burada; B. Lindner
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We study the dynamics of an active Brownian particle with a nonlinear friction function located in a spatial cubic potential. For strong but finite damping, the escape rate of the particle over the spatial potential barrier shows a nonmonotonic dependence on the noise intensity. We relate this behavior to the fact that the active particle escapes from a limit cycle rather than from a fixed point and that a certain amount of noise can stabilize the sojourn of the particle on this limit cycle.
Source: http://arxiv.org/abs/1203.6814v1
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Inti Sodemann; D. A. Pesin; A. H. MacDonald
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We estimate the strength of interactionenhanced coherence between two graphene or topological insulator surfacestate layers by solving imaginaryaxis gap equations in the random phase approximation. Using a selfconsistent treatment of dynamic screening of Coulomb interactions in the gapped phase, we show that the excitonic gap can reach values on the order of the Fermi energy at strong interactions. The gap is discontinuous as a function of interlayer separation and effective fine structure...
Source: http://arxiv.org/abs/1203.3594v1
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Gene Abrams; Zachary Mesyan
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For a field K and directed graph E, we analyze those elements of the Leavitt path algebra L_K(E) which lie in the commutator subspace [L_K(E), L_K(E)]. This analysis allows us to give easily computable necessary and sufficient conditions to determine which Lie algebras of the form [L_K(E), L_K(E)] are simple, when E is rowfinite (i.e., has finite outdegree) and L_K(E) is simple.
Source: http://arxiv.org/abs/1107.3114v2
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Yang Bai; HsinChia Cheng; Jason Gallicchio; Jiayin Gu
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The main background for the supersymmetric stop direct production search comes from Standard Model ttbar events. For the singlelepton search channel, we introduce a few kinematic variables to further suppress this background by focusing on its dileptonic and semileptonic topologies. All are defined to have end points in the background, but not signal distributions. They can substantially improve the stop signal significance and mass reach when combined with traditional kinematic variables such...
Source: http://arxiv.org/abs/1203.4813v1
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Victor Mukherjee; Shraddha Sharma; Amit Dutta
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We study the Loschmidt echo (LE) in a central spin model in which a central spin is globally coupled to an environment (E) which is subjected to a small and sudden quench at $t=0$ so that its state at $t=0^+$, remains the same as the ground state of the initial environmental Hamiltonian before the quench; this leads to a nonequilibrium situation. This state now evolves with two Hamiltonians, the final Hamiltonian following the quench and its modified version which incorporates an additional...
Source: http://arxiv.org/abs/1203.0737v2
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Jan Kolodynski; Jan Chwedenczuk; Wojciech Wasilewski
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A theoretical model describing the Raman scattering process in atomic vapors is constructed. The treatment investigates the lowexcitation regime suitable for modern experimental applications. Despite the incorporated decoherence effects (possibly mode dependent) it allows for a direct separation of the time evolution from the spatial degrees of freedom. The impact of noise on the temporal properties of the process is examined. The model is applied in two experimentally relevant situations of...
Source: http://arxiv.org/abs/1203.1402v3
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Vladimír Špitalský
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The tent map is an elementary example of an interval map possessing many interesting properties, such as dense periodicity, exactness, Lipschitzness and a kind of lengthexpansiveness. It is often used in constructions of dynamical systems on the interval/trees/graphs. The purpose of the present paper is to construct, on totally regular continua (i.e. on topologically rectifiable curves), maps sharing some typical properties with the tent map. These maps will be called lengthexpanding...
Source: http://arxiv.org/abs/1203.2352v1
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The ISTRA+ Collaboration; :; V. A. Duk; V. N. Bolotov; A. A. Khudyakov; V. A. Lebedev; A. I. Makarov; V. P. Novikov; A. Yu. Polyarush; S. A. Akimenko; G. I. Britvich; A. P. Filin; A. V. Inyakin; I. Ya. Korolkov; V. M. Leontiev; V. F. Obraztsov; V. A. Polyakov; V. I. Romanovsky; O. G. Tchikilev; V. A. Uvarov; O. P. Yushchenko
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The radiative decay K>mu nu gamma has been studied at ISTRA+ setup in a new kinematical region. About 22K events of K^ > mu^ nu_mu gamma have been observed. The sign and value of FvFa have been measured for the first time. The result is FvFa=0.21(4)(4).
Source: http://arxiv.org/abs/1005.3517v3
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Tetsuo Hyodo; Atsushi Hosaka; Makoto Oka
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Production cross sections of the pentaquark Theta+ baryon in the mesoninduced reactions are calculated for JP=1/2+ and 3/2+ cases. Through the comparison with the previous measurements at KEK, several quantum numbers are excluded. The remaining possibilities can be used to cast the upper limit on the Theta+ width, combining with the result from the JPARC E19 experiment.
Source: http://arxiv.org/abs/1203.0598v2
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Seyen Kouwn; Taeyoon Moon; Phillial Oh
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We investigate cosmological consequences of nonlinear sigma model coupled with a cosmological fluid which satisfies the continuity equation. The target space action is of de Sitter type and is composed of four scalar fields. The potential which is a function of only one of the scalar fields is also introduced. We perform a general analysis of the ensuing cosmological equations and give various critical points and their properties. Then, we show that the model exhibits exact cosmological...
Source: http://arxiv.org/abs/1203.6520v3
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I. Platais; C. Melo; S. N. Quinn; J. L. Clem; S. E. de Mink; A. Dotter; V. KozhurinaPlatais; D. W. Latham; A. Bellini
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We present a detailed analysis of the upper main sequence of the 1.3 Gyr old open cluster Trumpler 20. High accuracy BV photometry combined with the Very Large Telescope/FLAMES mediumresolution spectroscopy of 954 stars is essential to understanding the unusual appearance of the colormagnitude diagram (CMD), initially suggesting multiple populations in Trumpler 20. We show that differential reddening is a dominant contributor to the apparent splitting/widening of the mainsequence turnoff...
Source: http://arxiv.org/abs/1203.1053v1
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Esa Järvenpää; Maarit Järvenpää; Tamás Keleti
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We study parametrized families of orthogonal projections for which the dimension of the parameter space is strictly less than that of the Grassmann manifold. We answer the natural question of how much the Hausdorff dimension may decrease by verifying the best possible lower bound for the dimension of almost all projections of a finite measure. We also show that a similar result is valid for smooth families of maps from $n$dimensional Euclidean space to $m$dimensional one.
Source: http://arxiv.org/abs/1203.5296v1
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Alexander Hubbard; Axel Brandenburg
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At large magnetic Reynolds numbers, magnetic helicity evolution plays an important role in astrophysical largescale dynamos. The recognition of this fact led to the development of the dynamical alpha quenching formalism, which predicts catastrophically low mean fields in open systems. Here we show that in oscillatory alphaOmega dynamos this formalism predicts an unphysical magnetic helicity transfer between scales. An alternative technique is proposed where this artifact is removed by using...
Source: http://arxiv.org/abs/1107.0238v2
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Ahmet A. Husainov; Ekaterina S. Kudryashova
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The paper is devoted to a mathematical model of concurrency the special case of which is asynchronous system. Distributed asynchronous automata are introduced here. It is proved that the Petri nets and transition systems with independence can be considered like the distributed asynchronous automata. Time distributed asynchronous automata are defined in standard way by the map which assigns time intervals to events. It is proved that the time distributed asynchronous automata are generalized the...
Source: http://arxiv.org/abs/1203.3098v1
Mountain pine beetle galleries under the bark of a recentlykilled 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 results. Pacific Northwest...
Topics: r6, usda, stateandprivateforestry, treedamage, foresthealth, donaldjgoheen, ellenmichaelsgoheen,...
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KuoChuan Pan; Paul Ricker; Ronald Taam
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Type Ia supernovae are thought to be caused by thermonuclear explosions of a carbonoxygen white dwarf in close binary systems. In the singledegenerate scenario (SDS), the companion star is nondegenerate and can be significantly affected by the explosion. We explore this interaction by means of multidimensional adaptive mesh refinement simulations using the FLASH code. We consider several different companion types, including mainsequencelike stars (MS), red giants (RG), and helium stars...
Source: http://arxiv.org/abs/1203.1932v2
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Sameer M. Ikhdair; Ramazan Sever
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A nonpolynomial onedimensional quantum potential in the form of an isotonic oscillator (harmonic oscillator with a centripetal barrier) is studied. We provide the nonrelativistic bound state energy spectrum E_{n} and the wave functions {\psi}_{n}(x) in terms of the associated Laguerre polynomials in the framework of the NikiforovUvarov method. Under the spin and pseudospin symmetric limits, the analytic eigenvalues and the corresponding twocomponent upper and lowerspinors of the Dirac...
Source: http://arxiv.org/abs/1203.1736v2
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Jose M. Torrejon; Norbert S. Schulz; Michael A. Nowak
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We present an analysis of a pointed 141 ks Chandra high resolution transmission gratings observation of the Be Xray emitting star HD110432, a prominent member of the gamma Cas analogs. The Chandra lightcurve shows a high variability but its analysis fails to detect any coherent periodicity up to a frequency of 0.05 Hz. The analysis of the Chandra HETG spectrum shows that, to correctly describe the spectrum, three model components are needed. Two of those components are optically thin thermal...
Source: http://arxiv.org/abs/1203.1004v1
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Ion I. Cotaescu; Cosmin Crucean
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We construct the de Sitter QED in Coulomb gauge assuming that the quantum modes are prepared by a global apparatus which is able to determine a stable and invariant vacuum state, independent on the local coordinates. Then we proceed in traditional manner postulating the appropriate equaltime commutators and anticommutators of the interacting fields and deriving the perturbation expansion of the scattering operator. In this approach the $in out$ transitions amplitudes, measured by the same...
Source: http://arxiv.org/abs/1007.4647v4
Source: https://www.youtube.com/watch?v=Adyy7onr7a4 Uploader: BigRedCotton Upload date: 20120412
Topics: Youtube, video, Music, clip, 2012, 01, 22, 14, 43, 27, debcotton, debcottonsecondlinecollection,...
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S. Sorathia; F. M. Izrailev; V. G. Zelevinsky; G. L. Celardo
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Using the phenomenological expression for the level spacing distribution with only one parameter, $0 \leq \beta \leq \infty$, covering all regimes of chaos and complexity in a quantum system, we show that transport properties of the onedimensional Anderson model of finite size can be expressed in terms of this parameter. Specifically, we demonstrate a strictly linear relation between $\beta$ and the normalized localization length for the whole transition from strongly localized to extended...
Source: http://arxiv.org/abs/1107.2371v2
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Ayten Koç; Songül Esin; Ismail Güloğlu; Müge Kanuni; Ayten Koc; Songul Esin; Ismail Guloglu; Muge Kanuni
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Any finite dimensional semisimple algebra A over a field K is isomorphic to a direct sum of finite dimensional full matrix rings over suitable division rings. In this paper we will consider the special case where all division rings are exactly the field K. All such finite dimensional semisimple algebras arise as a finite dimensional Leavitt path algebra. For this specific finite dimensional semisimple algebra A over a field K, we define a uniquely detemined specific graph  which we name as a...
Source: http://arxiv.org/abs/1203.1405v1
Source: https://www.youtube.com/watch?v=EhMDOJ5UCyQ Uploader: BigRedCotton Upload date: 20120212
Topics: Youtube, video, News & Politics, clip, 2012, 02, 05, 14, 49, 51, debcotton,...
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Mladen Bestvina; Mark Feighn
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We prove that the complex of free factors of a free group of finite rank is hyperbolic.
Source: http://arxiv.org/abs/1107.3308v3
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R. Köhler; T. Ratzka; Ch. Leinert
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We present a study of the orbits of the triple system LHS1070, with the aim to determine individual masses of its components. Sixteen new relative astrometric positions of the three components in the K band were obtained with NACO at the VLT, Omega CASS at the 3.5m telescope on Calar Alto, and other highspatialresolution instruments. We combine them with data from the literature and fit orbit models to the dataset. We derive an improved fit for the orbit of LHS1070B and C around each other,...
Source: http://arxiv.org/abs/1203.6270v1
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A. T. Hatke; M. A. Zudov; J. D. Watson; M. J. Manfra
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We report on a remarkably strong, and a rather sharp, photoresistance peak originating from a dimensional magnetoplasmon resonance (MPR) in a high mobility GaAs/AlGaAs quantum well driven by microwave radiation into a zeroresistance state (ZRS). The analysis of the MPR signalreveals a negative background providing experimental evidence for the concept of absolute negative resistance associated with the ZRS. When a system is further subject to a dc field, the maxima of microwaveinduced...
Source: http://arxiv.org/abs/1203.4781v1
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Alexey Radul; Barak A. Pearlmutter; Jeffrey Mark Siskind
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We describe an implementation of the Farfel Fortran AD extensions. These extensions integrate forward and reverse AD directly into the programming model, with attendant benefits to flexibility, modularity, and ease of use. The implementation we describe is a "prepreprocessor" that generates input to existing Fortranbased AD tools. In essence, blocks of code which are targeted for AD by Farfel constructs are put into subprograms which capture their lexical variable context, and these...
Source: http://arxiv.org/abs/1203.1450v2
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In models of emergent gravity the metric arises as the expectation value of some collective field. Usually, many different collective fields with appropriate tensor properties are candidates for a metric. Which collective field describes the "physical geometry"? We resolve this "metric ambiguity" by an investigation of the most general form of the quantum effective action for several metrics. In the longdistance limit the physical metric is universal and accounts for a...
Source: http://arxiv.org/abs/1203.5214v1
one of my favorite songs played by my favorite band. Source: https://www.youtube.com/watch?v=yoXTiRRrtck Uploader: BigRedCotton Upload date: 20120226
Topics: Youtube, video, Music, TBC Brass Band, To Be Continued Brass Band, New Orleans, Second Line parade,...
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This work proposes two models of neutrino masses that predict nonzero $\theta_{13}$ under the nonAbelian discrete flavor symmetry $\mathbb{S}_3\otimes\mathbb{Z}_2$. We advocate that the size of $\theta_{13}$ is understood as a group theoretical consequence rather than a perturbed effect from the tribimaximal mixing. So, the difference of two models is designed only in terms of the flavor symmetry, by changing the charge assignment of righthanded neutrinos. The PMNS matrix in the first model...
Source: http://arxiv.org/abs/1203.1593v3
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Thomas Kahle; Ezra Miller
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We demonstrate how primary decomposition of commutative monoid congruences fails to capture the essence of primary decomposition in commutative rings by exhibiting a more sensitive theory of mesoprimary decomposition of congruences, complete with witnesses, associated prime objects, and an analogue of irreducible decomposition called coprincipal decomposition. We lift the combinatorial theory of mesoprimary decomposition to binomial ideals in monoid algebras. The resulting binomial mesoprimary...
Source: http://arxiv.org/abs/1107.4699v3
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J. Belfi; N. Beverini; G. Carelli; A. Di Virgilio; E. Maccioni; G. Saccorotti; F. Stefani; A. Velikoseltsev
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We report the observation of the ground rotation induced by the Mw=9.0, 11th of March 2011, Japan earthquake. The rotation measurements have been conducted with a ring laser gyroscope operating in a vertical plane, thus detecting rotations around the horizontal axis. Comparison of ground rotations with vertical accelerations from a colocated forcebalance accelerometer shows excellent ring laser coupling at periods longer than 100s. Under the plane wave assumption, we derive a theoretical...
Source: http://arxiv.org/abs/1203.2277v1
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Andrew SchechtmanRook; Kelley M. Hess
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We report the discovery of a UVbright tidal dwarf galaxy candidate in the NGC 4631/4656 galaxy group, which we designate NGC 4656UV. Using survey and archival data spanning from 1.4 GHz to the ultraviolet we investigate the gas kinematics and stellar properties of this system. The HI morphologies of NGC 4656UV and its parent galaxy NGC 4656 are extremely disturbed, with significant amounts of counterrotating and extraplanar gas. From UVFIR photometry, computed using a new method to correct...
Source: http://arxiv.org/abs/1203.1319v1
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Fusayoshi J. Ohkawa
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The halffilled ground state of the Hubbard model on the hypercubic lattice in D dimensions is studied by the Kondolattice theory, which is none other than the 1/D expansion theory, but within the constrained Hilbert subspace where no symmetry is allowed to be broken. A gap can open in the singleparticle excitation spectrum if and only if the residual entropy or entropy at T=+0 K is nonzero. The Mott insulator with no symmetry broken, if it is possible, is characterized by nonzero residual...
Source: http://arxiv.org/abs/1203.3576v2
Source: https://www.youtube.com/watch?v=tWjKABvDu8 Uploader: BigRedCotton Upload date: 20120411
Topics: Youtube, video, Music, clip, 2012, 01, 22, 11, 27, 04, debcotton, debcottonsecondlinecollection,...
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Péter L. Erdős; Claude Tardif; Gábor Tardos
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We characterize obstruction sets in caterpillar dualities in terms of regular languages, and give a construction of the dual of a regular family of caterpillars. We show that these duals correspond to the constraint satisfaction problems definable by a monadic linear Datalog program with at most one EDB per rule.
Source: http://arxiv.org/abs/1203.1347v1
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The Berry phase acquired by an electromagnetic field undergoing an adiabatic and cyclic evolution in phase space is a purely quantummechanical effect of the field. However, this phase is usually accompanied by a dynamical contribution and cannot be manifested in any lightbeam interference experiment because it is independent of the field state. We here show that such a phase can be produced using an atom coupled to a quantized field and driven by a slowly changing classical field, and it is...
Source: http://arxiv.org/abs/1203.0356v1
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Dam Thanh Son; Naoki Yamamoto
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In a threedimensional Fermi liquid, quasiparticles near the Fermi surface may possess a Berry curvature. We show that if the Berry curvature has a nonvanishing flux through the Fermi surface, the particle number associated with this Fermi surface has a triangle anomaly in external electromagnetic fields. We show how Landau's Fermi liquid theory should be modified to take into account the Berry curvature. We show that the "chiral magnetic effect" also emerges from the Berry curvature...
Source: http://arxiv.org/abs/1203.2697v2
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Jon. Aaronson; Maryam Hosseini; Mariusz Lemanczyk
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We examine the class of increasing sequences of natural numbers which are IPrigidity sequences for some weakly mixing probability preserving transformation. This property is closely related to the uncountability of the eigenvalue group of a corresponding nonsingular transformation. We give examples, including a superlacunary sequence which is not IPrigid.
Source: http://arxiv.org/abs/1203.2257v4
Source: https://www.youtube.com/watch?v=oXsAnoNENSA Uploader: BigRedCotton Upload date: 20120211
Topics: Youtube, video, News & Politics, clip, 2012, 02, 05, 11, 00, 43, debcotton,...
Playing Little Wayne's 'Hoes'. The sidewalk LOVED this song! Source: https://www.youtube.com/watch?v=BIOeRYUWUng Uploader: BigRedCotton Upload date: 20120227
Topics: Youtube, video, Music, TBC Brass Band, To Be Continued Brass Band, New Orleans, Second Line Parade,...
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H. M. Fried; Y. Gabellini; T. Grandou; Y. M. Sheu
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Removal of the quenched approximation in the mechanism which produced an analytic estimate of quarkbinding potentials, along with a reasonable conjecture of the color structure of the nucleon formed by such a binding potential, is shown to generate an effective, nucleon scattering and binding potential. The massscale factor on the order of the pion mass, previously introduced to define transverse imprecision of quark coordinates, is again used, while the strength of the potential is...
Source: http://arxiv.org/abs/1203.6137v1
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We use Young's raising operators to derive a Pieri rule for the ring generated by the indeterminates $h_{r,s}$ given in Macdonald's 9th Variation of the Schur functions. Under an appropriate specialisation of $h_{r,s}$, we derive the Pieri rule for the ring $\La(a)$ of double symmetric functions, which has a basis consisting of the double Schur functions. Together with a suitable interpretation of the JacobiTrudi identity, our Pieri rule allows us to obtain a new proof of a rule to calculate...
Source: http://arxiv.org/abs/1203.4729v1
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Aldo V. Figallo; Gustavo Pelaitay
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In 1982, L. Iturrioz introduced symmetrical Heyting algebras of order n (or SHnalgebras). In this paper, we define and study tense SHnalgebras namely, SHnalgebras endowed with two tense operators. These algebras constitute a generalization of tense LukasiewiczMoisil algebras. Our main interest is the duality theory for tense SHn algebras. In order to do this, we requiere Esakia's duality for Heyting algebras and Goldblatt's duality for bounded distributive lattices with operations.
Source: http://arxiv.org/abs/1203.5459v1
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A. Sheikhan; I. Snyman
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We theoretically study a charge qubit interacting with electrons in a semiinfinite 1D wire. The system displays the physics of the Fermi edge singularity. Our results generalize known results for the Fermiedge system to the regime where excitations induced by the qubit can resolve the spatial structure of the scattering region. We find resonant features in the qubit tunneling rate as a function of the qubit level splitting. They occur at integer multiples of h times v_F/l. Here v_F is the...
Source: http://arxiv.org/abs/1203.6567v1
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Juyeon Yi; Peter Talkner; GertLudwig Ingold
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The influence of repeated projective measurements on the dynamics of the state of a quantum system is studied in dependence of the time lag $\tau$ between successive measurements. In the limit of infinitely many measurements of the occupancy of a single state the total system approaches a uniform state. The asymptotic approach to this state is exponential in the case of finite Hilbert space dimension. The rate characterizing this approach undergoes a sharp transition from a monotonically...
Source: http://arxiv.org/abs/1107.5413v2
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We consider a system of many fermionic tachyons coupled to a scalar, pseudoscalar, vector and pseudovector fields. The scalar and pseudoscalar fields are responsible for the effective mass, while the pseudovector field is similar to ordinary electromagnetic field. The action of vector field $\omega_\mu$ results in tachyonic dispersion relation $\varepsilon_p=\sqrt{p^2+g^2\omega_0^2hpg\omega_0g\vec \sigma \cdot \nabla \omega_0m^2} g\vec \sigma \cdot \vec \omega$ that depends on helicity $h$...
Source: http://arxiv.org/abs/1203.5241v3
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S. Iubini; R. Franzosi; R. Livi; G. L. Oppo; A. Politi
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We explore the statistical behavior of the discrete nonlinear Schroedinger equation. We find a parameter region where the system evolves towards a state characterized by a finite density of breathers and a negative temperature. Such a state is metastable but the convergence to equilibrium occurs on astronomical time scales and becomes increasingly slower as a result of a coarsening processes. Stationary negativetemperature states can be experimentally generated via boundary dissipation or from...
Source: http://arxiv.org/abs/1203.4162v1
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Carlos Pedro Gonçalves
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Financial volatility risk and its relation to a business cyclerelated intrinsic time is addressed through a multiple round evolutionary quantum game equilibrium leading to turbulence and multifractal signatures in the financial returns and in the risk dynamics. The model is simulated and the results are compared with actual financial volatility data.
Source: http://arxiv.org/abs/1107.2562v2
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David Shilane; Derek Bean
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Twosample inference for the difference of population means typically relies upon a Central Limit Theorem approximation. When data are drawn from a Negative Binomial distribution, previous work of Shilane et al. (2010) showed that a Normal approximation is often unreliable in onesample inference and proposed alternative techniques. We seek to extend these methods to the problem of twosample inference on the difference of sample means in highly dispersed Negative Binomial models. We...
Source: http://arxiv.org/abs/1203.0812v1
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Takeshi Kobayashi; Tomo Takahashi
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We investigate the scaledependence, or the runnings, of linear and second order density perturbations generated in various curvaton scenarios. We argue that the second order perturbations, i.e. nonGaussianity, can strongly depend on the scale, even when the linear perturbations are nearly scaleinvariant. We present analytic formulae for the runnings from curvatons with general energy potentials, and clarify the conditions under which fNL becomes strongly scaledependent. From the point of...
Source: http://arxiv.org/abs/1203.3011v2
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Z. Berezhiani; F. Nesti
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Present experiments do not exclude that the neutron transforms into some invisible degenerate twin, so called mirror neutron, with an appreciable probability. These transitions are actively studied by monitoring neutron losses in ultracold neutron traps, where they can be revealed by their magnetic field dependence. In this work we reanalyze the experimental data acquired by the group of A.P. Serebrov at Institute LaueLangevin, and find a dependence at more than 5\sigma\ away from the null...
Source: http://arxiv.org/abs/1203.1035v1
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Maité Dupuis; Laurent Freidel; Etera R. Livine; Simone Speziale
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We develop an Hamiltonian representation of the sl(2,C) algebra on a phase space consisting of N copies of twistors, or bispinors. We identify a complete set of global invariants, and show that they generate a closed algebra including gl(N,C) as a subalgebra. Then, we define the linear and quadratic simplicity constraints which reduce the spinor variables to (framed) 3d spacelike polyhedra embedded in Minkowski spacetime. Finally, we introduce a new version of the simplicity constraints which...
Source: http://arxiv.org/abs/1107.5274v2
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Viktor Bekkert; Georgia Benkart; Vyacheslav Futorny; Iryna Kashuba
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We study $\mathbb Z$graded modules of nonzero level with arbitrary weight multiplicities over Heisenberg Lie algebras and the associated generalized loop modules over affine KacMoody Lie algebras. We construct new families of such irreducible modules over Heisenberg Lie algebras. Our main result establishes the irreducibility of the corresponding generalized loop modules providing an explicit construction of many new examples of irreducible modules for affine Lie algebras. In particular, to...
Source: http://arxiv.org/abs/1107.0893v2
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John H. Castillo; Gilberto GarcíaPulgarín; Juan Miguel VelásquezSoto
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We give new characterizations of the Midy's property and using these results we obtain a new proof of a special case of the Dirichlet's theorem about primes in arithmetic progression.
Source: http://arxiv.org/abs/1203.1273v1
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We give a new link spam detection and PageRank demotion algorithm called MaxRank. Like TrustRank and AntiTrustRank, it starts with a seed of handpicked trusted and spam pages. We define the MaxRank of a page as the frequency of visit of this page by a random surfer minimizing an average cost per time unit. On a given page, the random surfer selects a set of hyperlinks and clicks with uniform probability on any of these hyperlinks. The cost function penalizes spam pages and hyperlink removals....
Source: http://arxiv.org/abs/1203.1457v1
Source: https://www.youtube.com/watch?v=rQs5ffRPG4w Uploader: BigRedCotton Upload date: 20120211
Topics: Youtube, video, News & Politics, clip, 2012, 02, 05, 11, 00, 44, debcotton,...
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Raphaël Danchin; Piotr B. Mucha
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We investigate the incompressible NavierStokes equations with variable density. The aim is to prove existence and uniqueness results in the case of discontinuous ini tial density. In dimension n = 2, 3, assuming only that the initial density is bounded and bounded away from zero, and that the initial velocity is smooth enough, we get the localintime existence of unique solutions. Uniqueness holds in any dimension and for a wider class of velocity fields. Let us emphasize that all those...
Source: http://arxiv.org/abs/1203.1131v1
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F. Dahlem; T. Kociniewski; C. Marcenat; A. Grockowiak; L. Pascal; P. Achatz; J. Boulmer; D. Debarre; T. Klein; E. Bustarret; H. Courtois
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Scanning tunneling spectroscopies in the subKelvin temperature range were performed on superconducting Silicon epilayers doped with Boron in the atomic percent range. The resulting local differential conductance behaved as expected for a homogeneous superconductor, with an energy gap dispersion below +/ 10%. The spectral shape, the amplitude and temperature dependence of the superconductivity gap follow the BCS model, bringing further support to the hypothesis of a hole pairing mechanism...
Source: http://arxiv.org/abs/1007.3598v2
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F. Tijiwa Birk; W. Jiang; D. Davidović
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Measurements of magnetic hysteresis loops in single Co nanoparticles at dilution refrigerator temperatures are presented. The nanoparticles are in electric contact with bulk Al leads via tunnel junctions. The tunnel current versus magnetic field displays a magnetic hysteresis loop. The magnetic switching field is reduced by current, and the magnetization of the nanoparticle can be switched by applying a voltage pulse, demonstrating that the magnetic stability of the nanoparticle is diminished...
Source: http://arxiv.org/abs/1107.2850v3
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E. Hiyama; M. Kamimura
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In a previous work [Phys. Rev. A 85, 022502 (2012)] we calculated, with the use of our Gaussian expansion method for fewbody systems, the energy levels and spatial structure of the 4He trimer and tetramer ground and excited states using the LM2M2 potential, which has a very strong shortrange repulsion. In this work, we calculate the same quantities using the presently most accurate 4He4He potential [M. Przybytek et al., Phys. Rev. Lett. 104, 183003 (2010)] that includes the adiabatic,...
Source: http://arxiv.org/abs/1203.3130v2
Avian excavation in western white pine snag. Cascade Mountains, Southwest Oregon. 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 results. Pacific Northwest...
Topics: r6, usda, stateandprivateforestry, avianexcavation, foresthealth, donaldjgoheen, region6,...
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Zhicheng Zhong; G. Koster; Paul J. Kelly
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Competition between electronic and atomic reconstruction is a constantly recurring theme in transitionmetal oxides. We use density functional theory calculations to study this competition for a model system consisting of a thin film of the polar, infinitelayer structure ACuO2 (A=Ca, Sr, Ba) grown on a nonpolar, perovskite SrTiO3 substrate. A transition from the bulk planar structure to a chaintype thin film accompanied by substantial changes to the electronic structure is predicted for a...
Source: http://arxiv.org/abs/1203.5686v1
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Cluster decays of rareearth nuclei are studied with a view to look for neutron magic shells for the $_{50}$Sn nucleus as the daughter product always. The $^{100}$Sn and $^{132}$Sn radioactivities are studied to find the most probable cluster decays and the possibility, if any, of new neutron shells. For a wide range of parent nuclei considered here (from Ba to Pt) $^{12}$C from $^{112}$Ba and $^{78}$Ni from $^{210}$Pt parent are predicted to be the most probable clusters (minimum decay...
Source: http://arxiv.org/abs/1107.2532v3
playing 'I Got A Big Fat Woman' Source: https://www.youtube.com/watch?v=UGuGuIbR3jE Uploader: BigRedCotton Upload date: 20121116
Topics: Youtube, video, Music, Treme, Second line, brass band, parade, New Orleans, jazz, brass music, live...
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Maria Joita; Mohammad Sal Moslehian
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In this paper we introduce a notion of Morita equivalence for Hilbert C*modules in terms of the Morita equivalence of the algebras of compact operators on Hilbert C*modules. We investigate some properties of the new version of Morita equivalence and obtain some results. We then applied our results to study the continuous actions of locally compact groups on full Hilbert C*modules. We present an extension of Green's theorem in the context of Hilbert C*modules as well.
Source: http://arxiv.org/abs/1203.4425v1
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Andrej Bauer; Matija Pretnar
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Eff is a programming language based on the algebraic approach to computational effects, in which effects are viewed as algebraic operations and effect handlers as homomorphisms from free algebras. Eff supports firstclass effects and handlers through which we may easily define new computational effects, seamlessly combine existing ones, and handle them in novel ways. We give a denotational semantics of eff and discuss a prototype implementation based on it. Through examples we demonstrate how...
Source: http://arxiv.org/abs/1203.1539v1
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Sébastien Breteaux
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In this article the linear Boltzmann equation is derived for a particle interacting with a Gaussian random field, in the weak coupling limit, with renewal in time of the random field. The initial data can be chosen arbitrarily. The proof is geometric and involves coherent states and semiclassical calculus.
Source: http://arxiv.org/abs/1107.0788v2
Source: https://www.youtube.com/watch?v=VBAI0jFcjxk Uploader: BigRedCotton Upload date: 20120528
Topics: Youtube, video, Entertainment, clip, 2012, 05, 13, 11, 57, 42, debcotton,...
beautiful!! Source: https://www.youtube.com/watch?v=grgEgb4CcDE Uploader: BigRedCotton Upload date: 20120227
Topics: Youtube, video, News & Politics, Stooges Brass Band, New Orleans, Second Line Parade, Ninth...
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Omer Angel; Alexander E. Holroyd; Gady Kozma; Johan Wästlund; Peter Winkler
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A dyadic tile of order n is any rectangle obtained from the unit square by n successive bisections by horizontal or vertical cuts. Let each dyadic tile of order n be available with probability p, independently of the others. We prove that for p sufficiently close to 1, there exists a set of pairwise disjoint available tiles whose union is the unit square, with probability tending to 1 as n>infinity, as conjectured by Joel Spencer in 1999. In particular we prove that if p=7/8, such a tiling...
Source: http://arxiv.org/abs/1107.2636v3
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E. Ripamonti; M. Mapelli
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We study the possibility that the very broad (~1500 km/s) and luminous (L_5007 ~ 1.4e37 erg/s) [OIII] line emission observed in the globular cluster RZ 2109 might be explained with the photoionization of nova ejecta by the bright (L_X ~ 4e39 erg/s) Xray source hosted in the same globular cluster. We find that such scenario is plausible and explains most of the features of the RZ 2109 spectrum (line luminosity, absence of H emission lines, peculiar asymmetry of the line profile); on the other...
Source: http://arxiv.org/abs/1203.4233v1
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T. Aaltonen; for the CDF Collaboration
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We report on a search for the supersymmetric partner of the top quark (scalar top) decaying into a charm quark and a neutralino in ppbar collisions at sqrt(s)=1.96 TeV. The data sample, collected by the CDFII detector at the Fermilab Tevatron, corresponds to an integrated luminosity of 2.6 fb1. Candidate events are selected by requiring two or more jets and a large imbalance in the transverse momentum. To enhance the analysis sensitivity, at least one of the jets is required to be identified...
Source: http://arxiv.org/abs/1203.4171v3
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Edouard Hannezo; Jacques Prost; JeanFrancois Joanny
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We study theoretically the shapes of a dividing epithelial monolayer of cells lying on top of an elastic stroma. The negative tension created by cell division provokes a buckling instability at a finite wave vector leading to the formation of periodic arrays of villi and crypts. The instability is similar to the buckling of a metallic plate under compression. We use the results to rationalize the various structures of the intestinal lining observed \emph{in vivo}. Taking into account the...
Source: http://arxiv.org/abs/1203.2080v1
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Mohammad Naghshvar; Tara Javidi
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Consider a decision maker who is responsible to dynamically collect observations so as to enhance his information in a speedy manner about an underlying phenomena of interest while accounting for the penalty of wrong declaration. The special cases of the problem are shown to be that of noisy dynamic search and variablelength coding with feedback. Due to the sequential nature of the problem, the decision maker relies on his current information state to adaptively select the most...
Source: http://arxiv.org/abs/1203.4626v3
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X. Chen; M. Chen; B. Li; Y. Zhao; Y. Wu; J. Li
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In this paper, we attempt to revisit the problem of multiparty conferencing from a practical perspective, and to rethink the design space involved in this problem. We believe that an emphasis on low endtoend delays between any two parties in the conference is a must, and the source sending rate in a session should adapt to bandwidth availability and congestion. We present Celerity, a multiparty conferencing solution specifically designed to achieve our objectives. It is entirely...
Source: http://arxiv.org/abs/1107.1138v4
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D0 Collaboration
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We present the first search for supersymmetry (SUSY) in Zgamma final states with large missing transverse energy using data corresponding to an integrated luminosity of 6.2 fb1 collected with the D0 experiment in ppbar collisions at sqrt(s)=1.96 TeV. This signature is predicted in gaugemediated SUSYbreaking models, where the lightest neutralino is the nexttolightest supersymmetric particle (NLSP) and is produced in pairs, possibly through decay from heavier supersymmetric particles. The...
Source: http://arxiv.org/abs/1203.5311v1
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We find an exact expression for the bipartite fidelity f='^2, where vac> is the vacuum eigenstate of an infinitesize antiferromagnetic XXZ chain and vac>' is the vacuum eigenstate of an infinitesize XXZ chain which is split in two. We consider the quantity ln(f) which has been put forward as a measure of quantum entanglement, and show that the large correlation length xi behaviour is consistent with a general conjecture ln(f) ~ c/8 ln(xi), where c is the central charge of the UV...
Source: http://arxiv.org/abs/1203.2326v1
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Boris Buchmann; Gernot Müller
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GARCH is one of the most prominent nonlinear time series models, both widely applied and thoroughly studied. Recently, it has been shown that the COGARCH model (which was introduced a few years ago by Kl\"{u}ppelberg, Lindner and Maller) and Nelson's diffusion limit are the only functional continuoustime limits of GARCH in distribution. In contrast to Nelson's diffusion limit, COGARCH reproduces most of the stylized facts of financial time series. Since it has been proven that Nelson's...
Source: http://arxiv.org/abs/1203.0186v1
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Xuchu Ding; Mircea Lazar; Calin Belta
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This paper considers receding horizon control of finite deterministic systems, which must satisfy a high level, rich specification expressed as a linear temporal logic formula. Under the assumption that timevarying rewards are associated with states of the system and they can be observed in realtime, the control objective is to maximize the collected reward while satisfying the high level task specification. In order to properly react to the changing rewards, a controller synthesis framework...
Source: http://arxiv.org/abs/1203.2860v1
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Masaomi Ono; Masaaki Hashimoto; Shinichiro Fujimoto; Kei Kotake; Shoichi Yamada
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We investigate the nucleosynthesis in a massive star of 70 M_solar with solar metallicity in the main sequence stage. The helium core mass after hydrogen burning corresponds to 32 M_solar. Nucleosynthesis calculations have been performed during the stellar evolution and the jetlike supernova explosion of a collapsar model, where the weak s, p, and rprocesses are taken into account. We confirm that selements of 60 < A < 90 are highly overproduced relative to the solar abundances in the...
Source: http://arxiv.org/abs/1203.6488v2
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Roman Kompaneets; Alexei V. Ivlev; Sergey V. Vladimirov; Gregor E. Morfill
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The fundamental higherorder Landau plasma modes are known to be generally heavily damped. We show that these modes for the ion component in a weakly ionized plasma can be substantially modified by ionneutral collisions and a dc electric field driving ion flow so that some of them can become unstable. This instability is expected to naturally occur in presheaths of gas discharges at sufficiently small pressures and thus affect sheaths and discharge structures.
Source: http://arxiv.org/abs/1007.0142v3
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Nebojsa Milosavljevic; Sameer Pawar; Salim El Rouayheb; Michael Gastpar; Kannan Ramchandran
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In this paper we study the multisource multicast problem where every sink in a given directed acyclic graph is a client and is interested in a common file. We consider the case where each node can have partial knowledge about the file as a side information. Assuming that nodes can communicate over the capacity constrained links of the graph, the goal is for each client to gain access to the file, while minimizing some linear cost function of number of bits transmitted in the network. We...
Source: http://arxiv.org/abs/1203.2298v1
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The Daya Bay Collaboration has recently reported its first \bar{\nu}_e \to \bar{\nu}_e oscillation result which points to \theta_{13} \simeq 8.8^\circ \pm 0.8^\circ (bestfit \pm 1\sigma range) or \theta_{13} \neq 0^\circ at the 5.2\sigma level. The fact that this smallest neutrino mixing angle is not strongly suppressed motivates us to look into the underlying structure of lepton flavor mixing and CP violation. Two phenomenological strategies are outlined: (1) the lepton flavor mixing matrix U...
Source: http://arxiv.org/abs/1203.1672v2
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M. Cárdenas; F. F. Lasheras; A. Quintero; D. Repovš
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We present simple examples of finitedimensional connected homogeneous spaces (they are actually topological manifolds) with nonhomogeneous and nonrigid factors. In particular, we give an elementary solution of an old problem in general topology concerning homogeneous spaces.
Source: http://arxiv.org/abs/1203.4151v2
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Keita Kobayashi; Yoshiya Yamanaka
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We present an extension of Nelson's stochastic quantum mechanics to finite temperature. Utilizing the formulation of Thermo Field Dynamics (TFD), we can show that Ito's stochastic equations for tilde and nontilde particle positions reproduce the TFDtype Schr\"odinger equation which is equivalent to the Liouvillevon Neumann equation. In our formalism, the drift terms in the Ito's stochastic equation have the temperature dependence and the thermal fluctuation is induced through the...
Source: http://arxiv.org/abs/1007.3603v2
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N. Peretto; Ph. Andre; V. Konyves; N. Schneider; D. Arzoumanian; P. Palmeirim; P. Didelon; M. Attard; J. P. Bernard; J. Di Francesco; D. Elia; M. Hennemann; T. Hill; J. Kirk; A. Men'shchikov; F. Motte; Q. Nguyen Luong; H. Roussel; T. Sousbie; L. Testi; D. WardThompson; G. J. White; A. Zavagno
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A growing body of evidence indicates that the formation of filaments in interstellar clouds is a key component of the star formation process. In this paper, we present new Herschel PACS and SPIRE observations of the B59 and Stem regions in the Pipe Nebula complex, revealing a rich, organized network of filaments. The asymmetric column density profiles observed for several filaments, along with the bowlike edge of B59, indicates that the Pipe Nebula is being compressed from its western side,...
Source: http://arxiv.org/abs/1203.3403v1
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Joanna Woo; Avishai Dekel; S. M. Faber; Kai Noeske; David C. Koo; Brian F. Gerke; Michael C. Cooper; Samir Salim; Aaron A. Dutton; Jeffrey Newman; Benjamin J. Weiner; Kevin Bundy; Christopher N. A. Willmer; Marc Davis; Renbin Yan
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We study the dependence of starformation quenching on galaxy mass and environment, in the SDSS (z~0.1) and the AEGIS (z~1). It is crucial that we define quenching by low starformation rate rather than by red colour, given that one third of the red galaxies are star forming. We address stellar mass M*, halo mass Mh, density over the nearest N neighbours deltaN, and distance to the halo centre D. The fraction of quenched galaxies appears more strongly correlated with Mh at fixed M* than with M*...
Source: http://arxiv.org/abs/1203.1625v2