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710.2653
A Supersymmetric U(1)' Model with Multiple Dark Matters
We consider a scenario where a supersymmetric model has multiple dark matter particles. Adding a U(1)' gauge symmetry is a well-motivated extension of the Minimal Supersymmetric Standard Model (MSSM). It can cure the problems of the MSSM such as the mu-problem or the proton decay problem with high-dimensional lepton number and baryon number violating operators which R-parity allows. An extra parity (U-parity) may arise as a residual discrete symmetry after U(1)' gauge symmetry is spontaneously broken. The Lightest U-parity Particle (LUP) is stable under the new parity becoming a new dark matter candidate. Up to three massive particles can be stable in the presence of the R-parity and the U-parity. We numerically illustrate that multiple stable particles in our model can satisfy both constraints from the relic density and the direct detection, thus providing a specific scenario where a supersymmetric model has well-motivated multiple dark matters consistent with experimental constraints. The scenario provides new possibilities in the present and upcoming dark matter searches in the direct detection and collider experiments.
hep-ph
we consider a scenario where a supersymmetric model has multiple dark matter particles adding a u1 gauge symmetry is a wellmotivated extension of the minimal supersymmetric standard model mssm it can cure the problems of the mssm such as the muproblem or the proton decay problem with highdimensional lepton number and baryon number violating operators which rparity allows an extra parity uparity may arise as a residual discrete symmetry after u1 gauge symmetry is spontaneously broken the lightest uparity particle lup is stable under the new parity becoming a new dark matter candidate up to three massive particles can be stable in the presence of the rparity and the uparity we numerically illustrate that multiple stable particles in our model can satisfy both constraints from the relic density and the direct detection thus providing a specific scenario where a supersymmetric model has wellmotivated multiple dark matters consistent with experimental constraints the scenario provides new possibilities in the present and upcoming dark matter searches in the direct detection and collider experiments
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710.2654
Stellar explosions powered by the Blandford-Znajek mechanism
In this letter we briefly describe the first results of our numerical study on the possibility of magnetic origin of relativistic jets of long duration gamma ray bursters within the collapsar scenario. We track the collapse of massive rotating stars onto a rotating central black hole using axisymmetric general relativistic magnetohydrodynamic code that utilizes a realistic equation of state of stellar matter, takes into account the cooling associated with emission of neutrinos, and the energy losses due to dissociation of nuclei. The neutrino heating is not included. We describe the solution for one particular model where the progenitor star has magnetic field $B=10^{10}$G. The solution exhibits strong explosion driven by the Poynting-dominated jets whose power exceeds $2\times10^{51} {erg/s}$. The jets originate mainly from the black hole and they are powered via the Blandford-Znajek mechanism. The full details of the simulations together with the results of parameter study will be presented elsewhere. A number of simulation movies can be downloaded from http://www.maths.leeds.ac.uk/~serguei/research/movies/anim.html
astro-ph
in this letter we briefly describe the first results of our numerical study on the possibility of magnetic origin of relativistic jets of long duration gamma ray bursters within the collapsar scenario we track the collapse of massive rotating stars onto a rotating central black hole using axisymmetric general relativistic magnetohydrodynamic code that utilizes a realistic equation of state of stellar matter takes into account the cooling associated with emission of neutrinos and the energy losses due to dissociation of nuclei the neutrino heating is not included we describe the solution for one particular model where the progenitor star has magnetic field b1010g the solution exhibits strong explosion driven by the poyntingdominated jets whose power exceeds 2times1051 ergs the jets originate mainly from the black hole and they are powered via the blandfordznajek mechanism the full details of the simulations together with the results of parameter study will be presented elsewhere a number of simulation movies can be downloaded from httpwwwmathsleedsacuksergueiresearchmoviesanimhtml
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710.2655
Detailed Studies of Pixelated CZT Detectors Grown with the Modified Horizontal Bridgman Method
The detector material Cadmium Zinc Telluride (CZT), known for its high resolution over a broad energy range, is produced mainly by two methods: the Modified High-Pressure Bridgman (MHB) and the High-Pressure Bridgman (HPB) process. This study is based on MHB CZT substrates from the company Orbotech Medical Solutions Ltd. with a detector size of 2.0x2.0x0.5 cm^3, 8x8 pixels and a pitch of 2.46 mm. Former studies have emphasized only on the cathode material showing that high-work-function improve the energy resolution at lower energies. Therfore, we studied the influence of the anode material while keeping the cathode material constant. We used four different materials: Indium, Titanium, Chromium and Gold with work-functions between 4.1 eV and 5.1 eV. The low work-function materials Indium and Titanium achieved the best performance with energy resolutions: 2.0 keV (at 59 keV) and 1.9 keV (at 122 keV) for Titanium; 2.1 keV (at 59 keV) and 2.9 keV (at 122 keV) for Indium. These detectors are very competitive compared with the more expensive ones based on HPB material if one takes the large pixel pitch of 2.46 mm into account. We present a detailed comparison of our detector response with 3-D simulations, from which we determined the mobility-lifetime-products for electrons and holes. Finally, we evaluated the temperature dependency of the detector performance and mobility-lifetime-products, which is important for many applications. With decreasing temperature down to -30C the breakdown voltage increases and the electron mobility-lifetime-product decreases by about 30% over a range from 20C to -30C. This causes the energy resolution to deteriorate, but the concomitantly increasing breakdown voltage makes it possible to increase the applied bias voltage and restore the full performance.
astro-ph
the detector material cadmium zinc telluride czt known for its high resolution over a broad energy range is produced mainly by two methods the modified highpressure bridgman mhb and the highpressure bridgman hpb process this study is based on mhb czt substrates from the company orbotech medical solutions ltd with a detector size of 20x20x05 cm3 8x8 pixels and a pitch of 246 mm former studies have emphasized only on the cathode material showing that highworkfunction improve the energy resolution at lower energies therfore we studied the influence of the anode material while keeping the cathode material constant we used four different materials indium titanium chromium and gold with workfunctions between 41 ev and 51 ev the low workfunction materials indium and titanium achieved the best performance with energy resolutions 20 kev at 59 kev and 19 kev at 122 kev for titanium 21 kev at 59 kev and 29 kev at 122 kev for indium these detectors are very competitive compared with the more expensive ones based on hpb material if one takes the large pixel pitch of 246 mm into account we present a detailed comparison of our detector response with 3d simulations from which we determined the mobilitylifetimeproducts for electrons and holes finally we evaluated the temperature dependency of the detector performance and mobilitylifetimeproducts which is important for many applications with decreasing temperature down to 30c the breakdown voltage increases and the electron mobilitylifetimeproduct decreases by about 30 over a range from 20c to 30c this causes the energy resolution to deteriorate but the concomitantly increasing breakdown voltage makes it possible to increase the applied bias voltage and restore the full performance
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710.2656
Pioneer Anomaly: Evaluating Newly Recovered Data
The Pioneer 10/11 spacecraft yielded the most precise navigation in deep space to date. However, their radio-metric tracking data received from the distances between 20--70 astronomical units from the Sun consistently indicated the presence of a small, anomalous, Doppler frequency drift. The drift is a blue frequency shift that can be interpreted as a sunward acceleration of a_P = (8.74 +/- 1.33) x 10^(-10) m/s^2 for each particular spacecraft. This signal has become known as the Pioneer anomaly; the nature of this anomaly remains unexplained. New Pioneer 10 and 11 radio-metric Doppler data recently became available. The much extended set of Pioneer Doppler data is the primary source for new upcoming investigation of the anomaly. We also have almost entire records of flight telemetry files received from the the Pioneers. Together with original project documentation and newly developed software tools, this additional information is now used to reconstruct the engineering history of both spacecraft. To that extent, a thermal model of the Pioneer vehicles is being developed to study possible contribution of thermal recoil force acting on the two spacecraft. In addition, to improve the accuracy of orbital reconstruction, we developed a new approach that uses actual flight telemetry data during trajectory analysis of radio-metric Doppler files. The ultimate goal of these efforts is to investigate possible contributions of the thermal recoil force to the detected anomalous acceleration.
gr-qc
the pioneer 1011 spacecraft yielded the most precise navigation in deep space to date however their radiometric tracking data received from the distances between 2070 astronomical units from the sun consistently indicated the presence of a small anomalous doppler frequency drift the drift is a blue frequency shift that can be interpreted as a sunward acceleration of a_p 874 133 x 1010 ms2 for each particular spacecraft this signal has become known as the pioneer anomaly the nature of this anomaly remains unexplained new pioneer 10 and 11 radiometric doppler data recently became available the much extended set of pioneer doppler data is the primary source for new upcoming investigation of the anomaly we also have almost entire records of flight telemetry files received from the the pioneers together with original project documentation and newly developed software tools this additional information is now used to reconstruct the engineering history of both spacecraft to that extent a thermal model of the pioneer vehicles is being developed to study possible contribution of thermal recoil force acting on the two spacecraft in addition to improve the accuracy of orbital reconstruction we developed a new approach that uses actual flight telemetry data during trajectory analysis of radiometric doppler files the ultimate goal of these efforts is to investigate possible contributions of the thermal recoil force to the detected anomalous acceleration
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710.2657
Non-Newtonian viscosity in magnetized plasma
The particle and momentum balance equations can be solved on concentric circular flux surfaces to determine the effective viscous drag present in a magnetized tokamak plasma in the low aspect ratio limit. An analysis is developed utilizing the first-order Fourier expansion of the poloidal variation of quantities on the flux surface akin to that by Stacey and Sigmar [Phys. Fluids, 28, 9 (1985)]. Expressions to determine the poloidal variations of density, poloidal velocity, toroidal velocity, radial electric field, poloidal electric field, and other radial profiles are presented in a multi-species setting. Using as input experimental data for the flux surface averaged profiles of density, temperature, toroidal current, toroidal momentum injection, and the poloidal and toroidal rotations of at least one species of ion, one may solve the equations numerically for the remaining profiles. The resultant effective viscosities are compared to those predicted by Stacey and Sigmar and Shaing, et al., [Nuclear Fusion, 25, 4 (1985)]. A velocity dependence of the effective viscosity is observed, indicating the presence of non-Newtonian fluid behavior in magnetized plasma.
physics.plasm-ph
the particle and momentum balance equations can be solved on concentric circular flux surfaces to determine the effective viscous drag present in a magnetized tokamak plasma in the low aspect ratio limit an analysis is developed utilizing the firstorder fourier expansion of the poloidal variation of quantities on the flux surface akin to that by stacey and sigmar phys fluids 28 9 1985 expressions to determine the poloidal variations of density poloidal velocity toroidal velocity radial electric field poloidal electric field and other radial profiles are presented in a multispecies setting using as input experimental data for the flux surface averaged profiles of density temperature toroidal current toroidal momentum injection and the poloidal and toroidal rotations of at least one species of ion one may solve the equations numerically for the remaining profiles the resultant effective viscosities are compared to those predicted by stacey and sigmar and shaing et al nuclear fusion 25 4 1985 a velocity dependence of the effective viscosity is observed indicating the presence of nonnewtonian fluid behavior in magnetized plasma
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710.2658
Catalog of dessins d'enfants with \le 4 edges
In this work all the dessins d'enfant with no more than 4 edges are listed and their Belyi pairs are computed. In order to enumerate all dessins the technique of matrix model computations was used. The total number of dessins is 134; among them 77 are spherical, 53 of genus 1 and 4 of genus 2. The orders of automorphism groups of all the dessins are also found. Dessins are listed by the number of edges. Dessins with the same number of edges are ordered lexicographically by their lists of 0-valencies. The corresponding matrix model for any list of 0-valencies is given and computed. Complex matrix models for dessins with 1 -- 3 edges are used. For the dessins with 4 edges we use Hermitian matrix model, correlators for which are computed in [1].
math.AG
in this work all the dessins denfant with no more than 4 edges are listed and their belyi pairs are computed in order to enumerate all dessins the technique of matrix model computations was used the total number of dessins is 134 among them 77 are spherical 53 of genus 1 and 4 of genus 2 the orders of automorphism groups of all the dessins are also found dessins are listed by the number of edges dessins with the same number of edges are ordered lexicographically by their lists of 0valencies the corresponding matrix model for any list of 0valencies is given and computed complex matrix models for dessins with 1 3 edges are used for the dessins with 4 edges we use hermitian matrix model correlators for which are computed in 1
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710.2659
Rigidity and persistence for ensuring shape maintenance of multiagent meta formations (ext'd version)
This paper treats the problem of the merging of formations, where the underlying model of a formation is graphical. We first analyze the rigidity and persistence of meta-formations, which are formations obtained by connecting several rigid or persistent formations. Persistence is a generalization to directed graphs of the undirected notion of rigidity. In the context of moving autonomous agent formations, persistence characterizes the efficacy of a directed structure of unilateral distance constraints seeking to preserve a formation shape. We derive then, for agents evolving in a two- or three-dimensional space, the conditions under which a set of persistent formations can be merged into a persistent meta-formation, and give the minimal number of interconnections needed for such a merging. We also give conditions for a meta-formation obtained by merging several persistent formations to be persistent.
cs.MA cs.DM
this paper treats the problem of the merging of formations where the underlying model of a formation is graphical we first analyze the rigidity and persistence of metaformations which are formations obtained by connecting several rigid or persistent formations persistence is a generalization to directed graphs of the undirected notion of rigidity in the context of moving autonomous agent formations persistence characterizes the efficacy of a directed structure of unilateral distance constraints seeking to preserve a formation shape we derive then for agents evolving in a two or threedimensional space the conditions under which a set of persistent formations can be merged into a persistent metaformation and give the minimal number of interconnections needed for such a merging we also give conditions for a metaformation obtained by merging several persistent formations to be persistent
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710.266
Viscosity and confinement in magnetized plasma
An alternative to the Braginskii decomposition is proposed, one rooted in treating the viscosity as a scalar quantity in a coordinate-free representation. With appropriate application to the rate-of-shear tensor, one may solve the neoclassical force density equations for its undetermined velocity dependence, as well as the radial and poloidal profiles mentioned in [R. W. Johnson, Phys. Plasmas, under review], using an improved poloidal expansion. The pseudoplastic behavior of magnetized plasma is again obtained, and the high viscosity solution is determined to be physical. A clear relationship between confinement mode and viscosity is observed, indicating a physical origin for transport barriers, pedestals, and other phenomena. The gyroviscous contribution is found to be an effect on the order of one one-thousandth of one percent of the dominant collisional viscosity.
physics.plasm-ph
an alternative to the braginskii decomposition is proposed one rooted in treating the viscosity as a scalar quantity in a coordinatefree representation with appropriate application to the rateofshear tensor one may solve the neoclassical force density equations for its undetermined velocity dependence as well as the radial and poloidal profiles mentioned in r w johnson phys plasmas under review using an improved poloidal expansion the pseudoplastic behavior of magnetized plasma is again obtained and the high viscosity solution is determined to be physical a clear relationship between confinement mode and viscosity is observed indicating a physical origin for transport barriers pedestals and other phenomena the gyroviscous contribution is found to be an effect on the order of one onethousandth of one percent of the dominant collisional viscosity
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710.2661
Affine Geometry of Space Curves
This paper is devoted to the complete classification of space curves under affine transformations in the view of Cartan's theorem. Spivak has introduced the method but has not found the invariants. Furthermore, for the first time, we propound a necessary and sufficient condition for the invariants. Then, we study the shapes of space curves with constant curvatures in detail and suggest their applications in physics, computer vision and image processing.
math.DG
this paper is devoted to the complete classification of space curves under affine transformations in the view of cartans theorem spivak has introduced the method but has not found the invariants furthermore for the first time we propound a necessary and sufficient condition for the invariants then we study the shapes of space curves with constant curvatures in detail and suggest their applications in physics computer vision and image processing
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710.2662
Affine Classification of n-Curves
Classification of curves up to affine transformation in a finite dimensional space was studied by some different methods. In this paper, we achieve the exact formulas of affine invariants via the equivalence problem and in the view of Cartan's lemma and then, state a necessary and sufficient condition for classification of n--Curves.
math.DG
classification of curves up to affine transformation in a finite dimensional space was studied by some different methods in this paper we achieve the exact formulas of affine invariants via the equivalence problem and in the view of cartans lemma and then state a necessary and sufficient condition for classification of ncurves
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710.2663
A State Sum Link Invariant of Regular Isotopy
This paper has been withdrawn because there is a fundamental error in the computations; with the right computational scheme it seems to be just a version of the Jones polynomial
math.GT math.CO
this paper has been withdrawn because there is a fundamental error in the computations with the right computational scheme it seems to be just a version of the jones polynomial
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710.2664
Reconstructing Images from Projections Using the Maximum-Entropy Method. Numerical Simulations of Low-Aspect Astrotomography
The reconstruction of images from a small number of projections using the maximum-entropy method (MEM) with the Shannon entropy is considered. MEM provides higher-quality image reconstruction for sources with extended components than the Hogbom CLEAN method, which is also used in low-aspect astrotomography. The quality of image reconstruction for sources with mixed structure containing bright, compact features embedded in a comparatively weak, extended base can be further improved using a difference-mapping method, which requires a generalization of MEM for the reconstruction of sign-variable functions.We draw conclusions based on the results of numerical simulations for a number of model radio sources with various morphologies.
astro-ph
the reconstruction of images from a small number of projections using the maximumentropy method mem with the shannon entropy is considered mem provides higherquality image reconstruction for sources with extended components than the hogbom clean method which is also used in lowaspect astrotomography the quality of image reconstruction for sources with mixed structure containing bright compact features embedded in a comparatively weak extended base can be further improved using a differencemapping method which requires a generalization of mem for the reconstruction of signvariable functionswe draw conclusions based on the results of numerical simulations for a number of model radio sources with various morphologies
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710.2665
Lower bounds on the coefficients of Ehrhart polynomials
We present lower bounds for the coefficients of Ehrhart polynomials of convex lattice polytopes in terms of their volume. Concerning the coefficients of the Ehrhart series of a lattice polytope we show that Hibi's lower bound is not true for lattice polytopes without interior lattice points. The counterexample is based on a formula of the Ehrhart series of the join of two lattice polytope. We also present a formula for calculating the Ehrhart series of integral dilates of a polytope.
math.MG math.CO
we present lower bounds for the coefficients of ehrhart polynomials of convex lattice polytopes in terms of their volume concerning the coefficients of the ehrhart series of a lattice polytope we show that hibis lower bound is not true for lattice polytopes without interior lattice points the counterexample is based on a formula of the ehrhart series of the join of two lattice polytope we also present a formula for calculating the ehrhart series of integral dilates of a polytope
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710.2666
Generalized Chaplygin gas as geometrical dark energy
The generalized Chaplygin gas provides an interesting candidate for the present accelerated expansion of the universe. We explore a geometrical explanation for the generalized Chaplygin gas within the context of brane world theories where matter fields are confined to the brane by means of the action of a confining potential. We obtain the modified Friedmann equations, deceleration parameter and age of the universe in this scenario and show that they are consistent with the present observational data.
gr-qc
the generalized chaplygin gas provides an interesting candidate for the present accelerated expansion of the universe we explore a geometrical explanation for the generalized chaplygin gas within the context of brane world theories where matter fields are confined to the brane by means of the action of a confining potential we obtain the modified friedmann equations deceleration parameter and age of the universe in this scenario and show that they are consistent with the present observational data
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710.2667
On the generalized Jacobi equation
The standard text-book Jacobi equation (equation of geodesic deviation) arises by linearizing the geodesic equation around some chosen geodesic, where the linearization is done with respect to the coordinates and the velocities. The generalized Jacobi equation, introduced by Hodgkinson in 1972 and further developed by Mashhoon and others, arises if the linearization is done only with respect to the coordinates, but not with respect to the velocities. The resulting equation has been studied by several authors in some detail for timelike geodesics in a Lorentzian manifold. Here we begin by briefly considering the generalized Jacobi equation on affine manifolds, without a metric; then we specify to lightlike geodesics in a Lorentzian manifold. We illustrate the latter case by considering particular lightlike geodesics (a) in Schwarzschild spacetime and (b) in a plane-wave spacetime.
gr-qc
the standard textbook jacobi equation equation of geodesic deviation arises by linearizing the geodesic equation around some chosen geodesic where the linearization is done with respect to the coordinates and the velocities the generalized jacobi equation introduced by hodgkinson in 1972 and further developed by mashhoon and others arises if the linearization is done only with respect to the coordinates but not with respect to the velocities the resulting equation has been studied by several authors in some detail for timelike geodesics in a lorentzian manifold here we begin by briefly considering the generalized jacobi equation on affine manifolds without a metric then we specify to lightlike geodesics in a lorentzian manifold we illustrate the latter case by considering particular lightlike geodesics a in schwarzschild spacetime and b in a planewave spacetime
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710.2668
An Imaging and Spectral Study of Ten X-Ray Filaments around the Galactic Center
We report the detection of 10 new X-ray filaments using the data from the {\sl Chandra} X-ray satellite for the inner $6^{\prime}$ ($\sim 15$ parsec) around the Galactic center (GC). All these X-ray filaments are characterized by non-thermal energy spectra, and most of them have point-like features at their heads that point inward. Fitted with the simple absorbed power-law model, the measured X-ray flux from an individual filament in the 2-10 keV band is $\sim 2.8\times10^{-14}$ to $10^{-13}$ ergs cm$^{-2}$ s$^{-1}$ and the absorption-corrected X-ray luminosity is $\sim 10^{32}-10^{33}$ ergs s$^{-1}$ at a presumed distance of 8 kpc to the GC. We speculate the origin(s) of these filaments by morphologies and by comparing their X-ray images with the corresponding radio and infrared images. On the basis of combined information available, we suspect that these X-ray filaments might be pulsar wind nebulae (PWNe) associated with pulsars of age $10^3 \sim 3\times 10^5$ yr. The fact that most of the filament tails point outward may further suggest a high velocity wind blowing away form the GC.
astro-ph
we report the detection of 10 new xray filaments using the data from the sl chandra xray satellite for the inner 6prime sim 15 parsec around the galactic center gc all these xray filaments are characterized by nonthermal energy spectra and most of them have pointlike features at their heads that point inward fitted with the simple absorbed powerlaw model the measured xray flux from an individual filament in the 210 kev band is sim 28times1014 to 1013 ergs cm2 s1 and the absorptioncorrected xray luminosity is sim 10321033 ergs s1 at a presumed distance of 8 kpc to the gc we speculate the origins of these filaments by morphologies and by comparing their xray images with the corresponding radio and infrared images on the basis of combined information available we suspect that these xray filaments might be pulsar wind nebulae pwne associated with pulsars of age 103 sim 3times 105 yr the fact that most of the filament tails point outward may further suggest a high velocity wind blowing away form the gc
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710.2669
Probing CP properties of the Higgs Boson via \boldmath{e^+e^-\to t \bar{t}\phi
One of the main endeavors at future high-energy colliders is the search for the Higgs boson(s) and, once found, the probe of the fundamental properties. In particular, the charge conjugation and parity (CP) quantum numbers have to be determined. We show that these are unambiguously accessible at future $e^+e^-$ colliders through the measurement of the total cross section and the top polarization in associated Higgs production with top quark pairs.
hep-ph
one of the main endeavors at future highenergy colliders is the search for the higgs bosons and once found the probe of the fundamental properties in particular the charge conjugation and parity cp quantum numbers have to be determined we show that these are unambiguously accessible at future ee colliders through the measurement of the total cross section and the top polarization in associated higgs production with top quark pairs
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710.267
Search for Chargino-Neutralino Pair Production at CDF
We present the results of a search for associated production of the lightest chargino and next-to-lightest neutralino using 1 fb$^{-1}$ of $\sqrt s$ = 1.96 TeV p$\rm \bar p$ data collected with the CDF detector at the Tevatron. We combine the results of several multi-lepton final states to set upper limits on the cross section times branching ratio for chargino-neutralino production as a function of the chargino mass.
hep-ex
we present the results of a search for associated production of the lightest chargino and nexttolightest neutralino using 1 fb1 of sqrt s 196 tev prm bar p data collected with the cdf detector at the tevatron we combine the results of several multilepton final states to set upper limits on the cross section times branching ratio for charginoneutralino production as a function of the chargino mass
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710.2671
Sets non-thin at \infty in \Bbb C ^m, and the growth of sequences of entire functions of genus zero
In this paper we define the notion of non-thin at $\infty$ as follows: Let $E$ be a subset of $\Bbb C^m$. For any $R>0$ define $E_R=E\cap \{z\in \Bbb C ^m :|z|\leq R\}$. We say that $E$ is non-thin at $\infty$ if \lim_{R\to\infty}V_{E_R}(z)=0 for all $z\in \Bbb C^m$, where $V_E$ is the pluricomplex Green function of $E$. This definition of non-thin at $\infty$ has good properties: If $E\subset \Bbb C^m$ is non-thin at $\infty$ and $A$ is pluripolar then $E\backslash A$ is non-thin at $\infty$, if $E\subset \Bbb C^m$ and $F\subset \Bbb C^n$ are closed sets non-thin at $\infty$ then $E\times F\subset \Bbb C^m\times \Bbb C^n$ is non-thin at $\infty$ (see Lemma \ref{Lem1}). Then we explore the properties of non-thin at $\infty$ sets and apply this to extend the results in \cite{mul-yav} and \cite{trong-tuyen}.
math.CV math.DS
in this paper we define the notion of nonthin at infty as follows let e be a subset of bbb cm for any r0 define e_recap zin bbb c m zleq r we say that e is nonthin at infty if lim_rtoinftyv_e_rz0 for all zin bbb cm where v_e is the pluricomplex green function of e this definition of nonthin at infty has good properties if esubset bbb cm is nonthin at infty and a is pluripolar then ebackslash a is nonthin at infty if esubset bbb cm and fsubset bbb cn are closed sets nonthin at infty then etimes fsubset bbb cmtimes bbb cn is nonthin at infty see lemma reflem1 then we explore the properties of nonthin at infty sets and apply this to extend the results in citemulyav and citetrongtuyen
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710.2672
A Method of Experimentally Probing Transeverse Momentum Dependent Distributions
We calculate the double spin asymmetry A_LL(x, y, z, P_hT) of pi^0 production with the spectator model and the model based on the factorization ansatz. We also calculate the double spin asymmetry for the integration over the range of (x,y,z) for the setups of the experiments of COMPASS, HERMES, and JLab. We find that the results are characteristically dependent on the model used. Therefore, we suggest that the measurements of the double spin asymmetry provides a method of experimentally probing the transeverse momentum dependent distributions.
hep-ph
we calculate the double spin asymmetry a_llx y z p_ht of pi0 production with the spectator model and the model based on the factorization ansatz we also calculate the double spin asymmetry for the integration over the range of xyz for the setups of the experiments of compass hermes and jlab we find that the results are characteristically dependent on the model used therefore we suggest that the measurements of the double spin asymmetry provides a method of experimentally probing the transeverse momentum dependent distributions
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710.2673
Higher Derivative Corrections in M-theory via Local Supersymmetry
We investigate higher derivative corrections in M-theory by applying Noether's method. Cancellation of variations, which contain linear terms in 4-form field strength, under local supersymmetry is executed with the aid of computer programming. Structure of $R^4$ terms is uniquely determined and exactly matches with one-loop effective terms in type IIA superstring theory.
hep-th
we investigate higher derivative corrections in mtheory by applying noethers method cancellation of variations which contain linear terms in 4form field strength under local supersymmetry is executed with the aid of computer programming structure of r4 terms is uniquely determined and exactly matches with oneloop effective terms in type iia superstring theory
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710.2674
Linguistic Information Energy
In this treatment a text is considered to be a series of word impulses which are read at a constant rate. The brain then assembles these units of information into higher units of meaning. A classical systems approach is used to model an initial part of this assembly process. The concepts of linguistic system response, information energy, and ordering energy are defined and analyzed. Finally, as a demonstration, information energy is used to estimate the publication dates of a series of texts and the similarity of a set of texts.
cs.CL cs.IT math.IT
in this treatment a text is considered to be a series of word impulses which are read at a constant rate the brain then assembles these units of information into higher units of meaning a classical systems approach is used to model an initial part of this assembly process the concepts of linguistic system response information energy and ordering energy are defined and analyzed finally as a demonstration information energy is used to estimate the publication dates of a series of texts and the similarity of a set of texts
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710.2675
Band Gap of CsCl Film's as a Function of Lattice Constant
The manuscript reports experimental estimation of Cesium Chloride film's band gap and compares it with theoretical simulations. The band gap shows a strong dependence on it's lattice constant. Also, it is seen that the point defects present in the films strongly affects it's optical properties.
cond-mat.mtrl-sci
the manuscript reports experimental estimation of cesium chloride films band gap and compares it with theoretical simulations the band gap shows a strong dependence on its lattice constant also it is seen that the point defects present in the films strongly affects its optical properties
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710.2676
Radiation Damage Study for PHENIX Silicon Stripixel Sensors
Silicon stripixel sensors which were developed at BNL will be installed as part of the RHIC-PHENIX silicon vertex tracker (VTX). RHIC II operations provide luminosity up to 2x10^32 /cm2/s so the silicon stripixel sensors will be exposed to a significant amount of radiation. The most problematic radiation effect for VTX is the increase of leakage current, which degrades the signal to noise ratio and may saturate the readout electronics. We studied the radiation damage using the same diodes as CERN-RD48. First, the proportionality between the irradiation fluence and the increase of leakage current of CERN-RD48 was reproduced. Then beam experiments with stripixel sensor were done in which leakage current was found to increase in the same way as that of thereference diode. A stripixel sensor was also irradiated at the PHENIX interaction region (IR) during the 2006 run. We found the same relation between the integrated luminosity and determined fluence from increase of leakage current. The expected fluence is 3-6x10^12 Neq/cm2 (1 MeV neutron equivalent) in RHIC II operations for 10 years. Due to this expected exposure, setting the operating temperature in PHENIX to T< 0 deg. C to suppress leakage current is needed to avoid saturation of preamplifiers.
nucl-ex
silicon stripixel sensors which were developed at bnl will be installed as part of the rhicphenix silicon vertex tracker vtx rhic ii operations provide luminosity up to 2x1032 cm2s so the silicon stripixel sensors will be exposed to a significant amount of radiation the most problematic radiation effect for vtx is the increase of leakage current which degrades the signal to noise ratio and may saturate the readout electronics we studied the radiation damage using the same diodes as cernrd48 first the proportionality between the irradiation fluence and the increase of leakage current of cernrd48 was reproduced then beam experiments with stripixel sensor were done in which leakage current was found to increase in the same way as that of thereference diode a stripixel sensor was also irradiated at the phenix interaction region ir during the 2006 run we found the same relation between the integrated luminosity and determined fluence from increase of leakage current the expected fluence is 36x1012 neqcm2 1 mev neutron equivalent in rhic ii operations for 10 years due to this expected exposure setting the operating temperature in phenix to t 0 deg c to suppress leakage current is needed to avoid saturation of preamplifiers
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710.2677
The scalar unparticle effect on the charged lepton electric dipole moment
We study the charged lepton electric dipole moment which is induced by the scalar unparticle mediation and we predict the appropriate range for the free parameters appearing in the effective lagrangian which drives the unparticle-standard model lepton interactions. We observe that the charged lepton electric dipole moment is strongly sensitive to the scaling dimension d_u of the unparticle and the new couplings in the effective interaction. Furthermore, we see that the current experimental limits of charged lepton electric dipole moments can ensure an appropriate range for these free parameters.
hep-ph
we study the charged lepton electric dipole moment which is induced by the scalar unparticle mediation and we predict the appropriate range for the free parameters appearing in the effective lagrangian which drives the unparticlestandard model lepton interactions we observe that the charged lepton electric dipole moment is strongly sensitive to the scaling dimension d_u of the unparticle and the new couplings in the effective interaction furthermore we see that the current experimental limits of charged lepton electric dipole moments can ensure an appropriate range for these free parameters
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710.2678
Adaptive Directional Subdivision Schemes and Shearlet Multiresolution Analysis
In this paper, we propose a solution for a fundamental problem in computational harmonic analysis, namely, the construction of a multiresolution analysis with directional components. We will do so by constructing subdivision schemes which provide a means to incorporate directionality into the data and thus the limit function. We develop a new type of non-stationary bivariate subdivision schemes, which allow to adapt the subdivision process depending on directionality constraints during its performance, and we derive a complete characterization of those masks for which these adaptive directional subdivision schemes converge. In addition, we present several numerical examples to illustrate how this scheme works. Secondly, we describe a fast decomposition associated with a sparse directional representation system for two dimensional data, where we focus on the recently introduced sparse directional representation system of shearlets. In fact, we show that the introduced adaptive directional subdivision schemes can be used as a framework for deriving a shearlet multiresolution analysis with finitely supported filters, thereby leading to a fast shearlet decomposition.
math.NA math.FA
in this paper we propose a solution for a fundamental problem in computational harmonic analysis namely the construction of a multiresolution analysis with directional components we will do so by constructing subdivision schemes which provide a means to incorporate directionality into the data and thus the limit function we develop a new type of nonstationary bivariate subdivision schemes which allow to adapt the subdivision process depending on directionality constraints during its performance and we derive a complete characterization of those masks for which these adaptive directional subdivision schemes converge in addition we present several numerical examples to illustrate how this scheme works secondly we describe a fast decomposition associated with a sparse directional representation system for two dimensional data where we focus on the recently introduced sparse directional representation system of shearlets in fact we show that the introduced adaptive directional subdivision schemes can be used as a framework for deriving a shearlet multiresolution analysis with finitely supported filters thereby leading to a fast shearlet decomposition
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710.2679
A New Class of Group Field Theories for 1st Order Discrete Quantum Gravity
Group Field Theories, a generalization of matrix models for 2d gravity, represent a 2nd quantization of both loop quantum gravity and simplicial quantum gravity. In this paper, we construct a new class of Group Field Theory models, for any choice of spacetime dimension and signature, whose Feynman amplitudes are given by path integrals for clearly identified discrete gravity actions, in 1st order variables. In the 3-dimensional case, the corresponding discrete action is that of 1st order Regge calculus for gravity (generalized to include higher order corrections), while in higher dimensions, they correspond to a discrete BF theory (again, generalized to higher order) with an imposed orientation restriction on hinge volumes, similar to that characterizing discrete gravity. The new models shed also light on the large distance or semi-classical approximation of spin foam models. This new class of group field theories may represent a concrete unifying framework for loop quantum gravity and simplicial quantum gravity approaches.
gr-qc hep-th
group field theories a generalization of matrix models for 2d gravity represent a 2nd quantization of both loop quantum gravity and simplicial quantum gravity in this paper we construct a new class of group field theory models for any choice of spacetime dimension and signature whose feynman amplitudes are given by path integrals for clearly identified discrete gravity actions in 1st order variables in the 3dimensional case the corresponding discrete action is that of 1st order regge calculus for gravity generalized to include higher order corrections while in higher dimensions they correspond to a discrete bf theory again generalized to higher order with an imposed orientation restriction on hinge volumes similar to that characterizing discrete gravity the new models shed also light on the large distance or semiclassical approximation of spin foam models this new class of group field theories may represent a concrete unifying framework for loop quantum gravity and simplicial quantum gravity approaches
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710.268
Global properties of Stochastic Loewner evolution driven by Levy processes
Standard Schramm-Loewner evolution (SLE) is driven by a continuous Brownian motion which then produces a trace, a continuous fractal curve connecting the singular points of the motion. If jumps are added to the driving function, the trace branches. In a recent publication [1] we introduced a generalized SLE driven by a superposition of a Brownian motion and a fractal set of jumps (technically a stable L\'evy process). We then discussed the small-scale properties of the resulting L\'evy-SLE growth process. Here we discuss the same model, but focus on the global scaling behavior which ensues as time goes to infinity. This limiting behavior is independent of the Brownian forcing and depends upon only a single parameter, $\alpha$, which defines the shape of the stable L\'evy distribution. We learn about this behavior by studying a Fokker-Planck equation which gives the probability distribution for endpoints of the trace as a function of time. As in the short-time case previously studied, we observe that the properties of this growth process change qualitatively and singularly at $\alpha =1$. We show both analytically and numerically that the growth continues indefinitely in the vertical direction for $\alpha > 1$, goes as $\log t$ for $\alpha = 1$, and saturates for $\alpha< 1$. The probability density has two different scales corresponding to directions along and perpendicular to the boundary. In the former case, the characteristic scale is $X(t) \sim t^{1/\alpha}$. In the latter case the scale is $Y(t) \sim A + B t^{1-1/\alpha}$ for $\alpha \neq 1$, and $Y(t) \sim \ln t$ for $\alpha = 1$. Scaling functions for the probability density are given for various limiting cases.
cond-mat.stat-mech
standard schrammloewner evolution sle is driven by a continuous brownian motion which then produces a trace a continuous fractal curve connecting the singular points of the motion if jumps are added to the driving function the trace branches in a recent publication 1 we introduced a generalized sle driven by a superposition of a brownian motion and a fractal set of jumps technically a stable levy process we then discussed the smallscale properties of the resulting levysle growth process here we discuss the same model but focus on the global scaling behavior which ensues as time goes to infinity this limiting behavior is independent of the brownian forcing and depends upon only a single parameter alpha which defines the shape of the stable levy distribution we learn about this behavior by studying a fokkerplanck equation which gives the probability distribution for endpoints of the trace as a function of time as in the shorttime case previously studied we observe that the properties of this growth process change qualitatively and singularly at alpha 1 we show both analytically and numerically that the growth continues indefinitely in the vertical direction for alpha 1 goes as log t for alpha 1 and saturates for alpha 1 the probability density has two different scales corresponding to directions along and perpendicular to the boundary in the former case the characteristic scale is xt sim t1alpha in the latter case the scale is yt sim a b t11alpha for alpha neq 1 and yt sim ln t for alpha 1 scaling functions for the probability density are given for various limiting cases
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710.2681
Multiplicative properties of Morin maps
In the first part of the paper we construct a ring structure on the rational cobordism classes of Morin maps (i. e. smooth generic maps of corank 1). We show that associating to a Morin map its singular strata defines a ring homomorphism to $\Omega_* \otimes \Q$, the rational oriented cobordism ring. This is proved by analyzing multiple-point sets of product immersion. Using these homomorphisms we are able to identify the ring of Morin maps. In the second part of the paper we compute the oriented Thom polynomial of the $\Sigma^2$ singularity type with $\Q$ coefficients. Then we provide a product formula for the $\Sigma^2$ and the $\Sigma^{1,1}$ singularities.
math.GT math.AT
in the first part of the paper we construct a ring structure on the rational cobordism classes of morin maps i e smooth generic maps of corank 1 we show that associating to a morin map its singular strata defines a ring homomorphism to omega_ otimes q the rational oriented cobordism ring this is proved by analyzing multiplepoint sets of product immersion using these homomorphisms we are able to identify the ring of morin maps in the second part of the paper we compute the oriented thom polynomial of the sigma2 singularity type with q coefficients then we provide a product formula for the sigma2 and the sigma11 singularities
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710.2682
Cuspidal representations of sl(n+1)
In this paper we study the subcategory of cuspidal modules of the category of weight modules over the Lie algebra sl(n+1). Our main result is a complete classification and explicit description of the indecomposable cuspidal modules.
math.RT
in this paper we study the subcategory of cuspidal modules of the category of weight modules over the lie algebra sln1 our main result is a complete classification and explicit description of the indecomposable cuspidal modules
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710.2683
On the dynamics of a twisted disc immersed in a radiation field
We study the dynamics of a twisted tilted disc under the influence of an external radiation field. Assuming the effect of absorption and reemission/scattering is that a pressure is applied to the disc surface where the local optical depth is of order unity, we determine the response of the vertical structure and the influence it has on the possibility of instability to warping. We derive a pair of equations describing the evolution of a small tilt as a function of radius in the small amplitude regime that applies to both the diffusive and bending wave regimes. We also study the non linear vertical response of the disc numerically using an analogous one dimensional slab model. For global warps, we find that in order for the disc vertical structure to respond as a quasi uniform shift or tilt, as has been assumed in previous work, the product of the ratio of the external radiation momentum flux to the local disc mid plane pressure, where it is absorbed, with the disc aspect ratio should be significantly less than unity. Namely, this quantity should be of the order of or smaller than the ratio of the disc gas density corresponding to the layer intercepting radiation to the mid plane density, $\lambda \ll 1$. When this condition is not satisfied the disc surface tends to adjust so that the local normal becomes perpendicular to the radiation propagation direction. In this case dynamical quantities determined by the disc twist and warp tend to oscillate with a large characteristic period $T_{*}\sim \lambda^{-1}T_{K}$, where $T_{K}$ is some 'typical' orbital period of a gas element in the disc. The possibility of warping instability then becomes significantly reduced. In addition, when the vertical response is non uniform, the possible production of shocks may lead to an important dissipation mechanism.
astro-ph
we study the dynamics of a twisted tilted disc under the influence of an external radiation field assuming the effect of absorption and reemissionscattering is that a pressure is applied to the disc surface where the local optical depth is of order unity we determine the response of the vertical structure and the influence it has on the possibility of instability to warping we derive a pair of equations describing the evolution of a small tilt as a function of radius in the small amplitude regime that applies to both the diffusive and bending wave regimes we also study the non linear vertical response of the disc numerically using an analogous one dimensional slab model for global warps we find that in order for the disc vertical structure to respond as a quasi uniform shift or tilt as has been assumed in previous work the product of the ratio of the external radiation momentum flux to the local disc mid plane pressure where it is absorbed with the disc aspect ratio should be significantly less than unity namely this quantity should be of the order of or smaller than the ratio of the disc gas density corresponding to the layer intercepting radiation to the mid plane density lambda ll 1 when this condition is not satisfied the disc surface tends to adjust so that the local normal becomes perpendicular to the radiation propagation direction in this case dynamical quantities determined by the disc twist and warp tend to oscillate with a large characteristic period t_sim lambda1t_k where t_k is some typical orbital period of a gas element in the disc the possibility of warping instability then becomes significantly reduced in addition when the vertical response is non uniform the possible production of shocks may lead to an important dissipation mechanism
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710.2684
Open charm in nuclear matter at finite temperature
We study the properties of open-charm mesons ($D$ and $\bar {D}$) in nuclear matter at finite temperature within a self-consistent coupled-channel approach. The meson-baryon interactions are adopted from a type of broken SU(4) s-wave Tomozawa-Weinberg terms supplemented by an attractive scalar-isoscalar attraction. The in-medium solution at finite temperature incorporates Pauli blocking effects, mean-field binding on all the baryons involved, and $\pi$ and open-charm meson self-energies in a self-consistent manner. In the $DN$ sector, the $\Lambda_c$ and $\Sigma_c$ resonances, generated dynamically at 2593 MeV and 2770 MeV in free space, remain close to their free-space position while acquiring a remarkable width due to the thermal smearing of Pauli blocking as well as from the nuclear matter density effects. As a result, the $D$ meson spectral density shows a single pronounced peak for energies close to the $D$ meson free-space mass that broadens with increasing matter density with an extended tail particularly towards lower energies. The $\bar D$ potential shows a moderate repulsive behavior coming from the dominant I=1 contribution of the $\bar D N$ interaction. The low-density theorem is, however, not a good approximation for the $\bar D$ self-energy in spite of the absence of resonance-hole contributions close to threshold in this case. We speculate the possibility of $D$-mesic nuclei as well as discuss some consequences for the $J/\Psi$ suppression in heavy-ion collisions, in particular for the future CBM experiment at FAIR.
nucl-th hep-ph
we study the properties of opencharm mesons d and bar d in nuclear matter at finite temperature within a selfconsistent coupledchannel approach the mesonbaryon interactions are adopted from a type of broken su4 swave tomozawaweinberg terms supplemented by an attractive scalarisoscalar attraction the inmedium solution at finite temperature incorporates pauli blocking effects meanfield binding on all the baryons involved and pi and opencharm meson selfenergies in a selfconsistent manner in the dn sector the lambda_c and sigma_c resonances generated dynamically at 2593 mev and 2770 mev in free space remain close to their freespace position while acquiring a remarkable width due to the thermal smearing of pauli blocking as well as from the nuclear matter density effects as a result the d meson spectral density shows a single pronounced peak for energies close to the d meson freespace mass that broadens with increasing matter density with an extended tail particularly towards lower energies the bar d potential shows a moderate repulsive behavior coming from the dominant i1 contribution of the bar d n interaction the lowdensity theorem is however not a good approximation for the bar d selfenergy in spite of the absence of resonancehole contributions close to threshold in this case we speculate the possibility of dmesic nuclei as well as discuss some consequences for the jpsi suppression in heavyion collisions in particular for the future cbm experiment at fair
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710.2685
The Three Hat Problem
In this paper we study the Three Hat Problem which appeared in Puzzle Corner of the Technology Review magazine. This puzzle gives a scenario in which three players wearing hats are sitting together and each hat can be seen by everyone except the player that is wearing that hat. Each player is told that all of the hats contain a positive integer and that two of the integers add to the third. In an ordered, turn-wise, modular fashion, each player truthfully states whether or not he knows his integer. We give a strategy which allows for one of the players to solve for his integer for all possible integer configurations of the puzzle and prove it is the optimal such strategy.
math.HO
in this paper we study the three hat problem which appeared in puzzle corner of the technology review magazine this puzzle gives a scenario in which three players wearing hats are sitting together and each hat can be seen by everyone except the player that is wearing that hat each player is told that all of the hats contain a positive integer and that two of the integers add to the third in an ordered turnwise modular fashion each player truthfully states whether or not he knows his integer we give a strategy which allows for one of the players to solve for his integer for all possible integer configurations of the puzzle and prove it is the optimal such strategy
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710.2686
Mean first passage time for a Markovian jumping process
We consider a Markovian jumping process with two absorbing barriers, for which the waiting-time distribution involves a position-dependent coefficient. We solve the Fokker-Planck equation with boundary conditions and calculate the mean first passage time (MFPT) which appears always finite, also for the subdiffusive case. Then, for the case of the jumping-size distribution in form of the L\'evy distribution, we determine the probability density distributions and MFPT by means of numerical simulations. Dependence of the results on process parameters, as well as on the L\'evy distribution width, is discussed.
cond-mat.stat-mech
we consider a markovian jumping process with two absorbing barriers for which the waitingtime distribution involves a positiondependent coefficient we solve the fokkerplanck equation with boundary conditions and calculate the mean first passage time mfpt which appears always finite also for the subdiffusive case then for the case of the jumpingsize distribution in form of the levy distribution we determine the probability density distributions and mfpt by means of numerical simulations dependence of the results on process parameters as well as on the levy distribution width is discussed
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710.2687
Logarithmic tensor product theory for generalized modules for a conformal vertex algebra
We generalize the tensor product theory for modules for a vertex operator algebra previously developed in a series of papers by the first two authors to suitable module categories for a ''conformal vertex algebra'' or even more generally, for a "M\"obius vertex algebra.'' We do not require the module categories to be semisimple, and we accommodate modules with generalized weight spaces. As in the earlier series of papers, our tensor product functors depend on a complex variable, but in the present generality, the logarithm of the complex variable is required; the general representation theory of vertex operator algebras requires logarithmic structure. The first part of this work is devoted to the study of logarithmic intertwining operators and their role in the construction of the tensor product functors. The remainder of this work is devoted to the construction of the appropriate natural associativity isomorphisms between triple tensor product functors, to the proof of their fundamental properties, and to the construction of the resulting braided tensor category structure. This work includes the complete proofs in the present generality and can be read independently of the earlier series of papers.
math.QA hep-th math.RT
we generalize the tensor product theory for modules for a vertex operator algebra previously developed in a series of papers by the first two authors to suitable module categories for a conformal vertex algebra or even more generally for a mobius vertex algebra we do not require the module categories to be semisimple and we accommodate modules with generalized weight spaces as in the earlier series of papers our tensor product functors depend on a complex variable but in the present generality the logarithm of the complex variable is required the general representation theory of vertex operator algebras requires logarithmic structure the first part of this work is devoted to the study of logarithmic intertwining operators and their role in the construction of the tensor product functors the remainder of this work is devoted to the construction of the appropriate natural associativity isomorphisms between triple tensor product functors to the proof of their fundamental properties and to the construction of the resulting braided tensor category structure this work includes the complete proofs in the present generality and can be read independently of the earlier series of papers
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710.2688
On the invariant thermal Proca - Klein - Gordon equation
In this paper we discuss the invariant thermal Proca - Klein - Gordon equation (PKG). We argue that for the thermal PKG equation the absolute velocity is equal v = alpha*c, where alpha is the fine stucture constant for electromagnetic interaction.
physics.gen-ph
in this paper we discuss the invariant thermal proca klein gordon equation pkg we argue that for the thermal pkg equation the absolute velocity is equal v alphac where alpha is the fine stucture constant for electromagnetic interaction
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710.2689
Evanescent states in 2D electron systems with spin-orbit interaction and spin-dependent transmission through a barrier
We find that the total spectrum of electron states in a bounded 2D electron gas with spin-orbit interaction contains two types of evanescent states lying in different energy ranges. The first-type states fill in a gap, which opens in the band of propagating spin-splitted states if tangential momentum is nonzero. They are described by a pure imaginary wavevector. The states of second type lie in the forbidden band. They are described by a complex wavevector. These states give rise to unusual features of the electron transmission through a lateral potential barrier with spin-orbit interaction, such as an oscillatory dependence of the tunneling coefficient on the barrier width and electron energy. But of most interest is the spin polarization of an unpolarized incident electron flow. Particularly, the transmitted electron current acquires spin polarization even if the distribution function of incident electrons is symmetric with respect to the transverse momentum. The polarization efficiency is an oscillatory function of the barrier width. Spin filtering is most effective, if the Fermi energy is close to the barrier height.
cond-mat.mes-hall
we find that the total spectrum of electron states in a bounded 2d electron gas with spinorbit interaction contains two types of evanescent states lying in different energy ranges the firsttype states fill in a gap which opens in the band of propagating spinsplitted states if tangential momentum is nonzero they are described by a pure imaginary wavevector the states of second type lie in the forbidden band they are described by a complex wavevector these states give rise to unusual features of the electron transmission through a lateral potential barrier with spinorbit interaction such as an oscillatory dependence of the tunneling coefficient on the barrier width and electron energy but of most interest is the spin polarization of an unpolarized incident electron flow particularly the transmitted electron current acquires spin polarization even if the distribution function of incident electrons is symmetric with respect to the transverse momentum the polarization efficiency is an oscillatory function of the barrier width spin filtering is most effective if the fermi energy is close to the barrier height
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710.269
Another introduction to the geometry of metric spaces
Here Lipschitz conditions are used as a primary tool, for studying curves in metric spaces in particular.
math.MG
here lipschitz conditions are used as a primary tool for studying curves in metric spaces in particular
[['here', 'lipschitz', 'conditions', 'are', 'used', 'as', 'a', 'primary', 'tool', 'for', 'studying', 'curves', 'in', 'metric', 'spaces', 'in', 'particular']]
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710.2691
V1647 Orionis: One Year into Quiescence
We present new optical, near-IR, and mid-IR observations of the young eruptive variable star V1647 Orionis that went into outburst in late 2004 for approximately two years. Our observations were taken one year after the star had faded to its pre-outburst optical brightness and show that V1647Ori is still actively accreting circumstellar material. We compare and contrast these data with existing observations of the source from both pre-outburst and outburst phases. From near-IR spectroscopy we identify photospheric absorption features for the first time that allow us to constrain the classification of the young star itself. Our best fit spectral type is M0+-2 sub-classes with a visual extinction of 19+-2 magnitudes and a K-band veiling of rK~1.5+-0.2. We estimate that V1647Ori has a quiescent bolometric luminosity of ~9.5Lsun and a mass accretion rate of ~1.10^-6Msun yr^-1. Our derived mass and age, from comparison with evolutionary models, are 0.8+-0.2 Msun and ~0.5Myrs, respectively. The presence towards the star of shock excited optical [S II] and [Fe II] emission as well as near-IR H2 and [Fe II] emission perhaps suggests that a new Herbig-Haro flow is becoming visible close to the star.
astro-ph
we present new optical nearir and midir observations of the young eruptive variable star v1647 orionis that went into outburst in late 2004 for approximately two years our observations were taken one year after the star had faded to its preoutburst optical brightness and show that v1647ori is still actively accreting circumstellar material we compare and contrast these data with existing observations of the source from both preoutburst and outburst phases from nearir spectroscopy we identify photospheric absorption features for the first time that allow us to constrain the classification of the young star itself our best fit spectral type is m02 subclasses with a visual extinction of 192 magnitudes and a kband veiling of rk1502 we estimate that v1647ori has a quiescent bolometric luminosity of 95lsun and a mass accretion rate of 1106msun yr1 our derived mass and age from comparison with evolutionary models are 0802 msun and 05myrs respectively the presence towards the star of shock excited optical s ii and fe ii emission as well as nearir h2 and fe ii emission perhaps suggests that a new herbigharo flow is becoming visible close to the star
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710.2692
Nanomorphology of the blue iridescent wings of a giant tropical wasp, "Megascolia procer javanensis" (Hymenoptera)
The wings of the giant wasp "Megascolia Procer Javanensis" are opaque and iridescent. The origin of the blue-green iridescence is studied in detail, using reflection spectroscopy, scanning electron microscopy and physical modelling. It is shown that the structure responsible for the iridescence is a single homogeneous transparent chitin layer covering the whole surface of each wing. The opacity is essentially due to the presence of melanin in the stratified medium which forms the mechanical core of the wing.
physics.optics cond-mat.soft physics.bio-ph
the wings of the giant wasp megascolia procer javanensis are opaque and iridescent the origin of the bluegreen iridescence is studied in detail using reflection spectroscopy scanning electron microscopy and physical modelling it is shown that the structure responsible for the iridescence is a single homogeneous transparent chitin layer covering the whole surface of each wing the opacity is essentially due to the presence of melanin in the stratified medium which forms the mechanical core of the wing
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710.2693
Large-scale horizontal flows in the solar photosphere II: Long-term behaviour and magnetic activity response
Recently, we have developed a method useful for mapping large-scale horizontal velocity fields in the solar photosphere. The method was developed, tuned and calibrated using the synthetic data. Now, we applied the method to the series of Michelson Doppler Imager (MDI) dopplergrams covering almost one solar cycle in order to get the information about the long-term behaviour of surface flows. We have found that our method clearly reproduces the widely accepted properties of mean flow field components, such as torsional oscillations and a pattern of meridional circulation. We also performed a periodic analysis, however due to the data series length and large gaps we did not detect any significant periods. The relation between the magnetic activity influencing the mean zonal motion is studied. We found an evidence that the emergence of compact magnetic regions locally accelerates the rotation of supergranular pattern in their vicinity and that the presence of magnetic fields generally decelerates the rotation in the equatorial region. Our results show that active regions in the equatorial region emerge exhibiting a constant velocity (faster by 60 +/- 9 m/s than Carrington rate) suggesting that they emerge from the base of the surface radial shear at 0.95 R_sun, disconnect from their magnetic roots, and slow down during their evolution.
astro-ph
recently we have developed a method useful for mapping largescale horizontal velocity fields in the solar photosphere the method was developed tuned and calibrated using the synthetic data now we applied the method to the series of michelson doppler imager mdi dopplergrams covering almost one solar cycle in order to get the information about the longterm behaviour of surface flows we have found that our method clearly reproduces the widely accepted properties of mean flow field components such as torsional oscillations and a pattern of meridional circulation we also performed a periodic analysis however due to the data series length and large gaps we did not detect any significant periods the relation between the magnetic activity influencing the mean zonal motion is studied we found an evidence that the emergence of compact magnetic regions locally accelerates the rotation of supergranular pattern in their vicinity and that the presence of magnetic fields generally decelerates the rotation in the equatorial region our results show that active regions in the equatorial region emerge exhibiting a constant velocity faster by 60 9 ms than carrington rate suggesting that they emerge from the base of the surface radial shear at 095 r_sun disconnect from their magnetic roots and slow down during their evolution
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710.2694
Modeling Wildland Fire Propagation with Level Set Methods
Level set methods are versatile and extensible techniques for general front tracking problems, including the practically important problem of predicting the advance of a firefront across expanses of surface vegetation. Given a rule, empirical or otherwise, to specify the rate of advance of an infinitesimal segment of firefront arc normal to itself (i.e., given the firespread rate as a function of known local parameters relating to topography, vegetation, and meteorology), level set methods harness the well developed mathematical machinery of hyperbolic conservation laws on Eulerian grids to evolve the position of the front in time. Topological challenges associated with the swallowing of islands and the merger of fronts are tractable. The principal goals of this paper are to: collect key results from the two largely distinct scientific literatures of level sets and firespread; demonstrate the practical value of level set methods to wildland fire modeling through numerical experiments; probe and address current limitations; and propose future directions in the simulation of, and the development of decision-aiding tools to assess countermeasure options for, wildland fires. In addition, we introduce a freely available two-dimensional level set code used to produce the numerical results of this paper and designed to be extensible to more complicated configurations.
math.NA
level set methods are versatile and extensible techniques for general front tracking problems including the practically important problem of predicting the advance of a firefront across expanses of surface vegetation given a rule empirical or otherwise to specify the rate of advance of an infinitesimal segment of firefront arc normal to itself ie given the firespread rate as a function of known local parameters relating to topography vegetation and meteorology level set methods harness the well developed mathematical machinery of hyperbolic conservation laws on eulerian grids to evolve the position of the front in time topological challenges associated with the swallowing of islands and the merger of fronts are tractable the principal goals of this paper are to collect key results from the two largely distinct scientific literatures of level sets and firespread demonstrate the practical value of level set methods to wildland fire modeling through numerical experiments probe and address current limitations and propose future directions in the simulation of and the development of decisionaiding tools to assess countermeasure options for wildland fires in addition we introduce a freely available twodimensional level set code used to produce the numerical results of this paper and designed to be extensible to more complicated configurations
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710.2695
Optical structure and function of the white filamentary hair covering the edelweiss bracts
The optical properties of the inflorescence of the high-altitude ''Leontopodium nivale'' subsp. ''alpinum'' (edelweiss) is investigated, in relation with its submicrometer structure, as determined by scanning electron microscopy. The filaments forming the hair layer have been found to exhibit an internal structure which may be one of the few examples of a photonic structure found in a plant. Measurements of light transmission through a self-supported layer of hair pads taken from the bracts supports the idea that the wooly layer covering the plant absorbs near-ultraviolet radiation before it reaches the cellular tissue. Calculations based on a photonic-crystal model provides insight on the way radiation can be absorbed by the filamentary threads.
physics.optics cond-mat.soft physics.bio-ph
the optical properties of the inflorescence of the highaltitude leontopodium nivale subsp alpinum edelweiss is investigated in relation with its submicrometer structure as determined by scanning electron microscopy the filaments forming the hair layer have been found to exhibit an internal structure which may be one of the few examples of a photonic structure found in a plant measurements of light transmission through a selfsupported layer of hair pads taken from the bracts supports the idea that the wooly layer covering the plant absorbs nearultraviolet radiation before it reaches the cellular tissue calculations based on a photoniccrystal model provides insight on the way radiation can be absorbed by the filamentary threads
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710.2696
Time Machine at the LHC
Recently, black hole and brane production at CERN's Large Hadron Collider (LHC) has been widely discussed. We suggest that there is a possibility to test causality at the LHC. We argue that if the scale of quantum gravity is of the order of few TeVs, proton-proton collisions at the LHC could lead to the formation of time machines (spacetime regions with closed timelike curves) which violate causality. One model for the time machine is a traversable wormhole. We argue that the traversable wormhole production cross section at the LHC is of the same order as the cross section for the black hole production. Traversable wormholes assume violation of the null energy condition (NEC) and an exotic matter similar to the dark energy is required. Decay of the wormholes/time machines and signatures of time machine events at the LHC are discussed.
hep-ph gr-qc hep-th
recently black hole and brane production at cerns large hadron collider lhc has been widely discussed we suggest that there is a possibility to test causality at the lhc we argue that if the scale of quantum gravity is of the order of few tevs protonproton collisions at the lhc could lead to the formation of time machines spacetime regions with closed timelike curves which violate causality one model for the time machine is a traversable wormhole we argue that the traversable wormhole production cross section at the lhc is of the same order as the cross section for the black hole production traversable wormholes assume violation of the null energy condition nec and an exotic matter similar to the dark energy is required decay of the wormholestime machines and signatures of time machine events at the lhc are discussed
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710.2697
Ly Alpha-Emitting Galaxies at z=3.1: L* Progenitors Experiencing Rapid Star Formation
We studied the clustering properties and multiwavelength spectral energy distributions of a complete sample of 162 Ly Alpha-Emitting (LAE) galaxies at z=3.1 discovered in deep narrow-band MUSYC imaging of the Extended Chandra Deep Field South. LAEs were selected to have observed frame equivalent widths >80A and emission line fluxes >1.5E-17 erg/cm^2/s. Only 1% of our LAE sample appears to host AGN. The LAEs exhibit a moderate spatial correlation length of r_0=3.6+0.8-1.0 Mpc, corresponding to a bias factor b=1.7+0.3-0.4, which implies median dark matter halo masses of log10(M_med) = 10.9+0.5-0.9 M_sun. Comparing the number density of LAEs, (1.5+-0.3)E-3/Mpc^3, with the number density of these halos finds a mean halo occupation ~1-10%. The evolution of galaxy bias with redshift implies that most z=3.1 LAEs evolve into present-day galaxies with L<2.5L*, whereas other z>3 galaxy populations typically evolve into more massive galaxies. Halo merger trees show that z=0 descendants occupy halos with a wide range of masses, with a median descendant mass close to that of L*. Only 30% of LAEs have sufficient stellar mass (>~3E9 M_sun) to yield detections in deep Spitzer-IRAC imaging. A two-population SED fit to the stacked UBVRIzJK+[3.6,4.5,5.6,8.0]micron fluxes of the IRAC-undetected objects finds that the typical LAE has low stellar mass (1.0+0.6-0.4 E9 M_sun), moderate star formation rate (2+-1 M_sun/yr), a young component age of 20+30-10 Myr, and little dust (A_V<0.2). The best fit model has 20% of the mass in the young stellar component, but models without evolved stars are also allowed.
astro-ph
we studied the clustering properties and multiwavelength spectral energy distributions of a complete sample of 162 ly alphaemitting lae galaxies at z31 discovered in deep narrowband musyc imaging of the extended chandra deep field south laes were selected to have observed frame equivalent widths 80a and emission line fluxes 15e17 ergcm2s only 1 of our lae sample appears to host agn the laes exhibit a moderate spatial correlation length of r_0360810 mpc corresponding to a bias factor b170304 which implies median dark matter halo masses of log10m_med 1090509 m_sun comparing the number density of laes 1503e3mpc3 with the number density of these halos finds a mean halo occupation 110 the evolution of galaxy bias with redshift implies that most z31 laes evolve into presentday galaxies with l25l whereas other z3 galaxy populations typically evolve into more massive galaxies halo merger trees show that z0 descendants occupy halos with a wide range of masses with a median descendant mass close to that of l only 30 of laes have sufficient stellar mass 3e9 m_sun to yield detections in deep spitzerirac imaging a twopopulation sed fit to the stacked ubvrizjk36455680micron fluxes of the iracundetected objects finds that the typical lae has low stellar mass 100604 e9 m_sun moderate star formation rate 21 m_sunyr a young component age of 203010 myr and little dust a_v02 the best fit model has 20 of the mass in the young stellar component but models without evolved stars are also allowed
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710.2698
Photon storage in Lambda-type optically dense atomic media. IV. Optimal control using gradient ascent
We use the numerical gradient ascent method from optimal control theory to extend efficient photon storage in Lambda-type media to previously inaccessible regimes and to provide simple intuitive explanations for our optimization techniques. In particular, by using gradient ascent to shape classical control pulses used to mediate photon storage, we open up the possibility of high efficiency photon storage in the non-adiabatic limit, in which analytical solutions to the equations of motion do not exist. This control shaping technique enables an order-of-magnitude increase in the bandwidth of the memory. We also demonstrate that the often discussed connection between time reversal and optimality in photon storage follows naturally from gradient ascent. Finally, we discuss the optimization of controlled reversible inhomogeneous broadening.
quant-ph
we use the numerical gradient ascent method from optimal control theory to extend efficient photon storage in lambdatype media to previously inaccessible regimes and to provide simple intuitive explanations for our optimization techniques in particular by using gradient ascent to shape classical control pulses used to mediate photon storage we open up the possibility of high efficiency photon storage in the nonadiabatic limit in which analytical solutions to the equations of motion do not exist this control shaping technique enables an orderofmagnitude increase in the bandwidth of the memory we also demonstrate that the often discussed connection between time reversal and optimality in photon storage follows naturally from gradient ascent finally we discuss the optimization of controlled reversible inhomogeneous broadening
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710.2699
Lower bounds for warping functions on warped-product AHE manifolds
Let $[\gamma]$ be the conformal boundary of a warped product $C^{3,\alpha}$ AHE metric $g=g_M+u^2h$ on $N=M \times F$, where $(F,h)$ is compact with unit volume and nonpositive curvature. We show that if $[\gamma]$ has positive Yamabe constant, then $u$ has a positive lower bound that depends only on $[\gamma]$.
math.DG
let gamma be the conformal boundary of a warped product c3alpha ahe metric gg_mu2h on nm times f where fh is compact with unit volume and nonpositive curvature we show that if gamma has positive yamabe constant then u has a positive lower bound that depends only on gamma
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710.27
Percolative Effects on Noise in Pentacene Transistors
The 1/f noise in pentacene thin film transistors has been measured as a function of device thickness from well above the effective conduction channel thickness to only two conducting layers. Over the entire thickness range, the spectral noise form is 1/f, and the noise parameter varies as (gate voltage)-1, confirming that the noise is due to mobility fluctuations, even in the thinnest films. Hooge's parameter varies as an inverse power-law with conductivity for all film thicknesses. The magnitude and transport characteristics of the spectral noise are well explained in terms of percolative effects arising from the grain boundary structure.
cond-mat.mtrl-sci cond-mat.dis-nn
the 1f noise in pentacene thin film transistors has been measured as a function of device thickness from well above the effective conduction channel thickness to only two conducting layers over the entire thickness range the spectral noise form is 1f and the noise parameter varies as gate voltage1 confirming that the noise is due to mobility fluctuations even in the thinnest films hooges parameter varies as an inverse powerlaw with conductivity for all film thicknesses the magnitude and transport characteristics of the spectral noise are well explained in terms of percolative effects arising from the grain boundary structure
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710.2701
Chaotic quantum dots with strongly correlated electrons
Quantum dots pose a problem where one must confront three obstacles: randomness, interactions and finite size. Yet it is this confluence that allows one to make some theoretical advances by invoking three theoretical tools: Random Matrix theory (RMT), the Renormalization Group (RG) and the 1/N expansion. Here the reader is introduced to these techniques and shown how they may be combined to answer a set of questions pertaining to quantum dots
cond-mat.mes-hall
quantum dots pose a problem where one must confront three obstacles randomness interactions and finite size yet it is this confluence that allows one to make some theoretical advances by invoking three theoretical tools random matrix theory rmt the renormalization group rg and the 1n expansion here the reader is introduced to these techniques and shown how they may be combined to answer a set of questions pertaining to quantum dots
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710.2702
Blob formation and acceleration in the solar wind: role of converging flows and viscosity
The effect of viscosity and of converging flows on the formation of blobs in the slow solar wind is analysed by means of resistive MHD simulations. The regions above coronal streamers where blobs are formed (Sheeley et al., 1997) are simulated using a model previously proposed by Einaudi et al. (1999). The result of our investigation is twofold. First, we demonstrate a new mechanism for enhanced momentum transfer between a forming blob and the fast solar wind surrounding it. The effect is caused by the longer range of the electric field caused by the tearing instability forming the blob. The electric field reaches into the fast solar wind and interacts with it, causing a viscous drag that is global in nature rather than local across fluid layers as it is the case in normal uncharged fluids (like water). Second, the presence of a magnetic cusp at the tip of a coronal helmet streamer causes a converging of the flows on the two sides of the streamer and a direct push of the forming island by the fast solar wind, resulting in a more efficient momentum exchange.
astro-ph
the effect of viscosity and of converging flows on the formation of blobs in the slow solar wind is analysed by means of resistive mhd simulations the regions above coronal streamers where blobs are formed sheeley et al 1997 are simulated using a model previously proposed by einaudi et al 1999 the result of our investigation is twofold first we demonstrate a new mechanism for enhanced momentum transfer between a forming blob and the fast solar wind surrounding it the effect is caused by the longer range of the electric field caused by the tearing instability forming the blob the electric field reaches into the fast solar wind and interacts with it causing a viscous drag that is global in nature rather than local across fluid layers as it is the case in normal uncharged fluids like water second the presence of a magnetic cusp at the tip of a coronal helmet streamer causes a converging of the flows on the two sides of the streamer and a direct push of the forming island by the fast solar wind resulting in a more efficient momentum exchange
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710.2703
Monte Carlo study of two-dimensional Bose-Hubbard model
One of the most promising applications of ultracold gases in optical lattices is the possibility to use them as quantum emulators of more complex condensed matter systems. We provide benchmark calculations, based on exact quantum Monte Carlo simulations, for the emulator to be tested against. We report results for the ground state phase diagram of the two-dimensional Bose-Hubbard model at unity filling factor. We precisely trace out the critical behavior of the system and resolve the region of small insulating gaps, \Delta << J. The critical point is found to be (J/U)_c=0.05974(3), in perfect agreement with the high-order strong-coupling expansion method of Ref. 1. In addition, we present data for the effective mass of particle and hole excitations inside the insulating phase and obtain the critical temperature for the superfluid-normal transition at unity filling factor.
cond-mat.other cond-mat.stat-mech
one of the most promising applications of ultracold gases in optical lattices is the possibility to use them as quantum emulators of more complex condensed matter systems we provide benchmark calculations based on exact quantum monte carlo simulations for the emulator to be tested against we report results for the ground state phase diagram of the twodimensional bosehubbard model at unity filling factor we precisely trace out the critical behavior of the system and resolve the region of small insulating gaps delta j the critical point is found to be ju_c0059743 in perfect agreement with the highorder strongcoupling expansion method of ref 1 in addition we present data for the effective mass of particle and hole excitations inside the insulating phase and obtain the critical temperature for the superfluidnormal transition at unity filling factor
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710.2704
Low regularity solutions of two fifth-order KdV type equations
The Kawahara and modified Kawahara equations are fifth-order KdV type equations and have been derived to model many physical phenomena such as gravity-capillary waves and magneto-sound propagation in plasmas. This paper establishes the local well-posedness of the initial-value problem for Kawahara equation in $H^s({\mathbf R})$ with $s>-\frac74$ and the local well-posedness for the modified Kawahara equation in $H^s({\mathbf R})$ with $s\ge-\frac14$. To prove these results, we derive a fundamental estimate on dyadic blocks for the Kawahara equation through the $[k; Z]$ multiplier norm method of Tao \cite{Tao2001} and use this to obtain new bilinear and trilinear estimates in suitable Bourgain spaces.
math.AP math-ph math.MP
the kawahara and modified kawahara equations are fifthorder kdv type equations and have been derived to model many physical phenomena such as gravitycapillary waves and magnetosound propagation in plasmas this paper establishes the local wellposedness of the initialvalue problem for kawahara equation in hsmathbf r with sfrac74 and the local wellposedness for the modified kawahara equation in hsmathbf r with sgefrac14 to prove these results we derive a fundamental estimate on dyadic blocks for the kawahara equation through the k z multiplier norm method of tao citetao2001 and use this to obtain new bilinear and trilinear estimates in suitable bourgain spaces
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710.2705
Fingerprinting with Minimum Distance Decoding
This work adopts an information theoretic framework for the design of collusion-resistant coding/decoding schemes for digital fingerprinting. More specifically, the minimum distance decision rule is used to identify 1 out of t pirates. Achievable rates, under this detection rule, are characterized in two distinct scenarios. First, we consider the averaging attack where a random coding argument is used to show that the rate 1/2 is achievable with t=2 pirates. Our study is then extended to the general case of arbitrary $t$ highlighting the underlying complexity-performance tradeoff. Overall, these results establish the significant performance gains offered by minimum distance decoding as compared to other approaches based on orthogonal codes and correlation detectors. In the second scenario, we characterize the achievable rates, with minimum distance decoding, under any collusion attack that satisfies the marking assumption. For t=2 pirates, we show that the rate $1-H(0.25)\approx 0.188$ is achievable using an ensemble of random linear codes. For $t\geq 3$, the existence of a non-resolvable collusion attack, with minimum distance decoding, for any non-zero rate is established. Inspired by our theoretical analysis, we then construct coding/decoding schemes for fingerprinting based on the celebrated Belief-Propagation framework. Using an explicit repeat-accumulate code, we obtain a vanishingly small probability of misidentification at rate 1/3 under averaging attack with t=2. For collusion attacks which satisfy the marking assumption, we use a more sophisticated accumulate repeat accumulate code to obtain a vanishingly small misidentification probability at rate 1/9 with t=2. These results represent a marked improvement over the best available designs in the literature.
cs.IT cs.CR math.IT
this work adopts an information theoretic framework for the design of collusionresistant codingdecoding schemes for digital fingerprinting more specifically the minimum distance decision rule is used to identify 1 out of t pirates achievable rates under this detection rule are characterized in two distinct scenarios first we consider the averaging attack where a random coding argument is used to show that the rate 12 is achievable with t2 pirates our study is then extended to the general case of arbitrary t highlighting the underlying complexityperformance tradeoff overall these results establish the significant performance gains offered by minimum distance decoding as compared to other approaches based on orthogonal codes and correlation detectors in the second scenario we characterize the achievable rates with minimum distance decoding under any collusion attack that satisfies the marking assumption for t2 pirates we show that the rate 1h025approx 0188 is achievable using an ensemble of random linear codes for tgeq 3 the existence of a nonresolvable collusion attack with minimum distance decoding for any nonzero rate is established inspired by our theoretical analysis we then construct codingdecoding schemes for fingerprinting based on the celebrated beliefpropagation framework using an explicit repeataccumulate code we obtain a vanishingly small probability of misidentification at rate 13 under averaging attack with t2 for collusion attacks which satisfy the marking assumption we use a more sophisticated accumulate repeat accumulate code to obtain a vanishingly small misidentification probability at rate 19 with t2 these results represent a marked improvement over the best available designs in the literature
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710.2706
Kawamata-Viehweg Vanishing on Rational Surfaces in Positive Characteristic
We prove that the Kawamata-Viehweg vanishing theorem holds on rational surfaces in positive characteristic by means of the lifting property to W_2(k) of certain log pairs on smooth rational surfaces. As a corollary, the Kawamata-Viehweg vanishing theorem holds on log del Pezzo surfaces in positive characteristic.
math.AG
we prove that the kawamataviehweg vanishing theorem holds on rational surfaces in positive characteristic by means of the lifting property to w_2k of certain log pairs on smooth rational surfaces as a corollary the kawamataviehweg vanishing theorem holds on log del pezzo surfaces in positive characteristic
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710.2707
The Polyakov Loop and the Eigenvalues of the Dirac Operator
Aiming at the link between confinement and chiral symmetry the Polyakov loop represented as a spectral sum of eigenvalues of the Dirac operator was subject of recent studies. We analyze the volume dependence as well as the continuum behavior of this quantity for quenched QCD using staggered fermions. Furthermore, we present first results using dynamical configurations.
hep-lat
aiming at the link between confinement and chiral symmetry the polyakov loop represented as a spectral sum of eigenvalues of the dirac operator was subject of recent studies we analyze the volume dependence as well as the continuum behavior of this quantity for quenched qcd using staggered fermions furthermore we present first results using dynamical configurations
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710.2708
Hodge-theoretic aspects of the Decomposition Theorem
Given a projective morphism of compact, complex, algebraic varieties and a relatively ample line bundle on the domain we prove that a suitable choice, dictated by the line bundle, of the decomposition isomorphism of the Decomposition Theorem of Beilinson, Bernstein, Deligne and Gabber, yields isomorphisms of pure Hodge structures. The proof is based on a new cohomological characterization of the decomposition isomorphism associated with the line bundle. We prove some corollaries concerning the intersection form in intersection cohomology, the natural map from cohomology to intersection cohomology, projectors and Hodge cycles, and induced morphisms in intersection cohomology.
math.AG
given a projective morphism of compact complex algebraic varieties and a relatively ample line bundle on the domain we prove that a suitable choice dictated by the line bundle of the decomposition isomorphism of the decomposition theorem of beilinson bernstein deligne and gabber yields isomorphisms of pure hodge structures the proof is based on a new cohomological characterization of the decomposition isomorphism associated with the line bundle we prove some corollaries concerning the intersection form in intersection cohomology the natural map from cohomology to intersection cohomology projectors and hodge cycles and induced morphisms in intersection cohomology
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710.2709
Dynamical black holes with symmetry in Einstein-Gauss-Bonnet gravity
We explore various aspects of dynamical black holes defined by a future outer trapping horizon in $n(\ge 5)$-dimensional Einstein-Gauss-Bonnet gravity. In the present paper, we assume that the spacetime has symmetries corresponding to the isometries of an $(n-2)$-dimensional maximally symmetric space and the Gauss-Bonnet coupling constant is non-negative. Depending on the existence or absence of the general relativistic limit, solutions are classified into GR and non-GR branches, respectively. Assuming the null energy condition on matter fields, we show that a future outer trapping horizon in the GR branch possesses the same properties as that in general relativity. In contrast, that in the non-GR branch is shown to be non-spacelike with its area non-increasing into the future. We can recognize this peculiar behavior to arise from a fact that the null energy condition necessarily leads to the null convergence condition for radial null vectors in the GR branch, but not in the non-GR branch. The energy balance law yields the first law of a trapping horizon, from which we can read off the entropy of a trapping horizon reproducing Iyer-Wald's expression. The entropy of a future outer trapping horizon is shown to be non-decreasing in both branches along its generator.
gr-qc hep-th
we explore various aspects of dynamical black holes defined by a future outer trapping horizon in nge 5dimensional einsteingaussbonnet gravity in the present paper we assume that the spacetime has symmetries corresponding to the isometries of an n2dimensional maximally symmetric space and the gaussbonnet coupling constant is nonnegative depending on the existence or absence of the general relativistic limit solutions are classified into gr and nongr branches respectively assuming the null energy condition on matter fields we show that a future outer trapping horizon in the gr branch possesses the same properties as that in general relativity in contrast that in the nongr branch is shown to be nonspacelike with its area nonincreasing into the future we can recognize this peculiar behavior to arise from a fact that the null energy condition necessarily leads to the null convergence condition for radial null vectors in the gr branch but not in the nongr branch the energy balance law yields the first law of a trapping horizon from which we can read off the entropy of a trapping horizon reproducing iyerwalds expression the entropy of a future outer trapping horizon is shown to be nondecreasing in both branches along its generator
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710.271
Fluctuation-dissipation theorem for thermo-refractive noise
We introduce a simple prescription for calculating the spectra of thermal fluctuations of temperature-dependent quantities of the form $\hat{\delta T}(t)=\int d^3\vec{r} \delta T(\vec{r},t) q(\vec{r})$. Here $T(\vec{r}, t)$ is the local temperature at location $\vec{r}$ and time $t$, and $q(\vec{r})$ is an arbitrary function. As an example of a possible application, we compute the spectrum of thermo-refractive coating noise in LIGO, and find a complete agreement with the previous calculation of Braginsky, Gorodetsky and Vyatchanin. Our method has computational advantage, especially for non-regular or non-symmetric geometries, and for the cases where $q(\vec{r})$ is non-negligible in a significant fraction of the total volume.
cond-mat.stat-mech astro-ph gr-qc
we introduce a simple prescription for calculating the spectra of thermal fluctuations of temperaturedependent quantities of the form hatdelta ttint d3vecr delta tvecrt qvecr here tvecr t is the local temperature at location vecr and time t and qvecr is an arbitrary function as an example of a possible application we compute the spectrum of thermorefractive coating noise in ligo and find a complete agreement with the previous calculation of braginsky gorodetsky and vyatchanin our method has computational advantage especially for nonregular or nonsymmetric geometries and for the cases where qvecr is nonnegligible in a significant fraction of the total volume
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710.2711
High photo-excited carrier multiplication by charged InAs dots in AlAs/GaAs/AlAs resonant tunneling diode
We present an approach for the highly sensitive photon detection based on the quantum dots (QDs) operating at temperature of 77K. The detection structure is based on an AlAs/GaAs/AlAs double barrier resonant tunneling diode combined with a layer of self-assembled InAs QDs (QD-RTD). A photon rate of 115 photons per second had induced 10nA photocurrent in this structure, corresponding to the photo-excited carrier multiplication factor of 10^7. This high multiplication factor is achieved by the quantum dot induced memory effect and the resonant tunneling tuning effect of QD-RTD structure.
quant-ph
we present an approach for the highly sensitive photon detection based on the quantum dots qds operating at temperature of 77k the detection structure is based on an alasgaasalas double barrier resonant tunneling diode combined with a layer of selfassembled inas qds qdrtd a photon rate of 115 photons per second had induced 10na photocurrent in this structure corresponding to the photoexcited carrier multiplication factor of 107 this high multiplication factor is achieved by the quantum dot induced memory effect and the resonant tunneling tuning effect of qdrtd structure
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710.2712
The structures of standard (g,K)-modules of SL(3,R)
We describe explicitely the structures of standard $(g,K)$-modules of $SL(3,R)$.
math.RT math.NT
we describe explicitely the structures of standard gkmodules of sl3r
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710.2713
Leptonic CP Violation Induced by Approximately mu-tau Symmetric Seesaw Mechanism
Assuming a minimal seesaw model with two heavy neutrinos (N), we examine effects of leptonic CP violation induced by approximate mu-tau symmetric interactions. As long as N is subject to the mu-tau symmetry, we can choose CP phases of Dirac mass terms without loss of generality in such a way that these phases arise from mu-tau symmetry breaking interactions. In the case that no phase is present in heavy neutrino mass terms, leptonic CP phases are controlled by two phases alpha and beta. The similar consideration is extended to N blind to the mu-tau symmetry. It is argued that N subject (blind) to the mu-tau symmetry necessarily describes the normal (inverted) mass hierarchy. We restrict ourselves to mu-tau symmetric textures giving the tri-bimaximal mixing and calculate flavor neutrino masses to estimate CP-violating Dirac and Majorana phases as well as neutrino mixing angles as functions of alpha and beta. Since alpha and beta are generated by mu-tau symmetry breaking interactions, CP-violating Majorana phase tends to be suppressed and is found to be at most O(0.1) radian. On the other hand, CP-violating Dirac phase tends to show a proportionality to alpha or to beta.
hep-ph
assuming a minimal seesaw model with two heavy neutrinos n we examine effects of leptonic cp violation induced by approximate mutau symmetric interactions as long as n is subject to the mutau symmetry we can choose cp phases of dirac mass terms without loss of generality in such a way that these phases arise from mutau symmetry breaking interactions in the case that no phase is present in heavy neutrino mass terms leptonic cp phases are controlled by two phases alpha and beta the similar consideration is extended to n blind to the mutau symmetry it is argued that n subject blind to the mutau symmetry necessarily describes the normal inverted mass hierarchy we restrict ourselves to mutau symmetric textures giving the tribimaximal mixing and calculate flavor neutrino masses to estimate cpviolating dirac and majorana phases as well as neutrino mixing angles as functions of alpha and beta since alpha and beta are generated by mutau symmetry breaking interactions cpviolating majorana phase tends to be suppressed and is found to be at most o01 radian on the other hand cpviolating dirac phase tends to show a proportionality to alpha or to beta
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710.2714
On the Brink of Major Discoveries in Weak Charm Decays -- a Bismarckian Chance to Make History
The recently obtained strong evidence for $D^0 - \bar D^0$ oscillations from the $B$ factories provides an important benchmark in our search for New Physics in charm transitions. While the theoretical verdict on the observed values of $x_D$ and $y_D$ is ambiguous -- they could be fully generated by SM dynamics, yet could contain also a sizable contribution from New Physics -- such oscillations provide a new stage for \cp violation driven by New Physics. After emphasizing the unique role of charm among up-type quarks, I describe in some detail the \cp phenomenology for charm decays.
hep-ph
the recently obtained strong evidence for d0 bar d0 oscillations from the b factories provides an important benchmark in our search for new physics in charm transitions while the theoretical verdict on the observed values of x_d and y_d is ambiguous they could be fully generated by sm dynamics yet could contain also a sizable contribution from new physics such oscillations provide a new stage for cp violation driven by new physics after emphasizing the unique role of charm among uptype quarks i describe in some detail the cp phenomenology for charm decays
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710.2715
Off-shell dimensional reduction of 5D orbifold supergravity
We present a systematic way for deriving a four-dimensional (4D) effective action of the five-dimensional (5D) orbifold supergravity respecting the N=1 {\it off-shell} structure. As an illustrating example, we derive a 4D effective theory of the 5D gauged supergravity with a universal hypermultiplet and {\it generic} gaugings, which includes the 5D heterotic M-theory and the supersymmetric Randall-Sundrum model as special limits of the gauging parameters. We show the vacuum structure of such model, especially the nature of moduli stabilization, introducing perturbative superpotential terms at the orbifold fixed points.
hep-th hep-ph
we present a systematic way for deriving a fourdimensional 4d effective action of the fivedimensional 5d orbifold supergravity respecting the n1 it offshell structure as an illustrating example we derive a 4d effective theory of the 5d gauged supergravity with a universal hypermultiplet and it generic gaugings which includes the 5d heterotic mtheory and the supersymmetric randallsundrum model as special limits of the gauging parameters we show the vacuum structure of such model especially the nature of moduli stabilization introducing perturbative superpotential terms at the orbifold fixed points
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710.2716
Cost and Effects of Pinning Control for Network Synchronization
In this paper, the problem of pinning control for synchronization of complex dynamical networks is discussed. A cost function of the controlled network is defined by the feedback gain and the coupling strength of the network. An interesting result is that lower cost is achieved by the control scheme of pinning nodes with smaller degrees. Some rigorous mathematical analysis is presented for achieving lower cost in the synchronization of different star-shaped networks. Numerical simulations on some non-regular complex networks generated by the Barabasi-Albert model and various star-shaped networks are shown for verification and illustration.
cs.NI
in this paper the problem of pinning control for synchronization of complex dynamical networks is discussed a cost function of the controlled network is defined by the feedback gain and the coupling strength of the network an interesting result is that lower cost is achieved by the control scheme of pinning nodes with smaller degrees some rigorous mathematical analysis is presented for achieving lower cost in the synchronization of different starshaped networks numerical simulations on some nonregular complex networks generated by the barabasialbert model and various starshaped networks are shown for verification and illustration
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710.2717
Probing Nonequilibrium Fluctuations through Linear Response
Linear response analysis in the nonequilibrium steady state (Gaussian regime) provides two independent fluctuation-response relations. One, in the form of the symmetric matrix, manifests the departure from the equilibrium formula through the quantity so-called {\it irreversible circulation}. The other, in the anti-symmetric form, connects the asymmetries in the fluctuation and the response function. These formulas represent characteristic features of fluctuations far from equilibrium, which have no counterparts in thermal equilibrium.
cond-mat.stat-mech cond-mat.soft
linear response analysis in the nonequilibrium steady state gaussian regime provides two independent fluctuationresponse relations one in the form of the symmetric matrix manifests the departure from the equilibrium formula through the quantity socalled it irreversible circulation the other in the antisymmetric form connects the asymmetries in the fluctuation and the response function these formulas represent characteristic features of fluctuations far from equilibrium which have no counterparts in thermal equilibrium
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710.2718
Stochastic resonance in a single electron turnstile
In this paper, we report stochastic resonance (SR) in a single electron turnstile. It has been known that SR emerges by the cooperation of a weak periodic signal and noise in a bistable system. A periodic signal produces switching between two stable states by lowering the potential barrier. Even if the amplitude of the signal is not large enough to make the potential barrier disappear, the switching can occur with the help of noise. As a result, an output signal-to-noise ratio (SNR), which shows how much the switching is synchronized with the signal, can be enhanced by increasing the noise. We have formulated the SR in a single electron turnstile into the adiabatic two-state theory of McNamara-Wiesenfeld and confirmed its manifestation by numerical simulation. These results could be applied to detection of the periodic motion of very small electric charge under noisy environment.
quant-ph
in this paper we report stochastic resonance sr in a single electron turnstile it has been known that sr emerges by the cooperation of a weak periodic signal and noise in a bistable system a periodic signal produces switching between two stable states by lowering the potential barrier even if the amplitude of the signal is not large enough to make the potential barrier disappear the switching can occur with the help of noise as a result an output signaltonoise ratio snr which shows how much the switching is synchronized with the signal can be enhanced by increasing the noise we have formulated the sr in a single electron turnstile into the adiabatic twostate theory of mcnamarawiesenfeld and confirmed its manifestation by numerical simulation these results could be applied to detection of the periodic motion of very small electric charge under noisy environment
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710.2719
Branes on Poisson varieties
We first extend the notion of connection in the context of Courant algebroids to obtain a new characterization of generalized Kaehler geometry. We then establish a new notion of isomorphism between holomorphic Poisson manifolds, which is non-holomorphic in nature. Finally we show an equivalence between certain configurations of branes on Poisson varieties and generalized Kaehler structures, and use this to construct explicitly new families of generalized Kaehler structures on compact holomorphic Poisson manifolds equipped with positive Poisson line bundles (e.g. Fano manifolds). We end with some speculations concerning the connection to non-commutative algebraic geometry.
math.DG hep-th math.SG
we first extend the notion of connection in the context of courant algebroids to obtain a new characterization of generalized kaehler geometry we then establish a new notion of isomorphism between holomorphic poisson manifolds which is nonholomorphic in nature finally we show an equivalence between certain configurations of branes on poisson varieties and generalized kaehler structures and use this to construct explicitly new families of generalized kaehler structures on compact holomorphic poisson manifolds equipped with positive poisson line bundles eg fano manifolds we end with some speculations concerning the connection to noncommutative algebraic geometry
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710.272
Schubert Polynomials for the affine Grassmannian of the symplectic group
We study the Schubert calculus of the affine Grassmannian Gr of the symplectic group. The integral homology and cohomology rings of Gr are identified with dual Hopf algebras of symmetric functions, defined in terms of Schur's P and Q-functions. An explicit combinatorial description is obtained for the Schubert basis of the cohomology of Gr, and this is extended to a definition of the affine type C Stanley symmetric functions. A homology Pieri rule is also given for the product of a special Schubert class with an arbitrary one.
math.CO math.AG
we study the schubert calculus of the affine grassmannian gr of the symplectic group the integral homology and cohomology rings of gr are identified with dual hopf algebras of symmetric functions defined in terms of schurs p and qfunctions an explicit combinatorial description is obtained for the schubert basis of the cohomology of gr and this is extended to a definition of the affine type c stanley symmetric functions a homology pieri rule is also given for the product of a special schubert class with an arbitrary one
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710.2721
Large nonlinear absorption and refraction coefficients of carbon nanotubes estimated from femtosecond Z-scan measurements
Nonlinear transmission of 80 and 140 femtosecond pulsed light with $0.79 \mu m$ wavelength through single walled carbon nanotubes suspended in water containing sodium dodecyl sulphate is studied. Pulse-width independent saturation absorption and negative cubic nonlinearity are observed, respectively, in open and closed aperture Z-scan experiments. The theoretical expressions derived to analyze the z-dependent transmission in the saturable limit require two photon absorption coefficient $\beta_0\sim$ $1.4 cm/MW$ and a nonlinear index $\gamma \sim -5.5 \times10^{-11} cm^2/W$ to fit the data.
cond-mat.mtrl-sci
nonlinear transmission of 80 and 140 femtosecond pulsed light with 079 mu m wavelength through single walled carbon nanotubes suspended in water containing sodium dodecyl sulphate is studied pulsewidth independent saturation absorption and negative cubic nonlinearity are observed respectively in open and closed aperture zscan experiments the theoretical expressions derived to analyze the zdependent transmission in the saturable limit require two photon absorption coefficient beta_0sim 14 cmmw and a nonlinear index gamma sim 55 times1011 cm2w to fit the data
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710.2722
The 2006 Radio Outburst of a Microquasar Cyg X-3: Observation and Data
We present the results of the multi-frequency observations of radio outburst of the microquasar Cyg X-3 in February and March 2006 with the Nobeyama 45-m telescope, the Nobeyama Millimeter Array, and the Yamaguchi 32-m telescope. Since the prediction of a flare by RATAN-600, the source has been monitored from Jan 27 (UT) with these radio telescopes. At the eighteenth day after the quench of the activity, successive flares exceeding 1 Jy were observed successfully. The time scale of the variability in the active phase is presumably shorter in higher frequency bands. We also present the result of a follow-up VLBI observation at 8.4 GHz with the Japanese VLBI Network (JVN) 2.6 days after the first rise. The VLBI image exhibits a single core with a size of <8 mas (80 AU). The observed image was almost stable, although the core showed rapid variation in flux density. No jet structure was seen at a sensitivity of $T_b = 7.5\times 10^5$ K.
astro-ph
we present the results of the multifrequency observations of radio outburst of the microquasar cyg x3 in february and march 2006 with the nobeyama 45m telescope the nobeyama millimeter array and the yamaguchi 32m telescope since the prediction of a flare by ratan600 the source has been monitored from jan 27 ut with these radio telescopes at the eighteenth day after the quench of the activity successive flares exceeding 1 jy were observed successfully the time scale of the variability in the active phase is presumably shorter in higher frequency bands we also present the result of a followup vlbi observation at 84 ghz with the japanese vlbi network jvn 26 days after the first rise the vlbi image exhibits a single core with a size of 8 mas 80 au the observed image was almost stable although the core showed rapid variation in flux density no jet structure was seen at a sensitivity of t_b 75times 105 k
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710.2723
Boundary conditions for Dirac fermions on a terminated honeycomb lattice
We derive the boundary condition for the Dirac equation corresponding to a tight-binding model on a two-dimensional honeycomb lattice terminated along an arbitary direction. Zigzag boundary conditions result generically once the boundary is not parallel to the bonds. Since a honeycomb strip with zigzag edges is gapless, this implies that confinement by lattice termination does not in general produce an insulating nanoribbon. We consider the opening of a gap in a graphene nanoribbon by a staggered potential at the edge and derive the corresponding boundary condition for the Dirac equation. We analyze the edge states in a nanoribbon for arbitrary boundary conditions and identify a class of propagating edge states that complement the known localized edge states at a zigzag boundary.
cond-mat.mes-hall
we derive the boundary condition for the dirac equation corresponding to a tightbinding model on a twodimensional honeycomb lattice terminated along an arbitary direction zigzag boundary conditions result generically once the boundary is not parallel to the bonds since a honeycomb strip with zigzag edges is gapless this implies that confinement by lattice termination does not in general produce an insulating nanoribbon we consider the opening of a gap in a graphene nanoribbon by a staggered potential at the edge and derive the corresponding boundary condition for the dirac equation we analyze the edge states in a nanoribbon for arbitrary boundary conditions and identify a class of propagating edge states that complement the known localized edge states at a zigzag boundary
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710.2724
General Solution of the Quantum Damped Harmonic Oscillator
In this paper the general solution of the quantum damped harmonic oscillator is given.
quant-ph math-ph math.MP
in this paper the general solution of the quantum damped harmonic oscillator is given
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710.2725
A moduli scheme of embedded curve singularities
The main purpose of this paper is to prove the existence of the moduli space parameterizing the embedded curve singularities of $(k^N,0)$ with an admissible Hilbert polynomial and to study its basic properties.
math.AG math.AC
the main purpose of this paper is to prove the existence of the moduli space parameterizing the embedded curve singularities of kn0 with an admissible hilbert polynomial and to study its basic properties
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710.2726
Log Structures on Generalized Semi-Stable Varieties
This is my PhD Thesis, part of it has published in Acta Mathematica Sinica. In this paper, a class of morphisms which have a kind of singularity weaker than normal crossing is considered. We construct the obstruction such that the so-called semi-stable log structures exists if and only if the obstruction vanishes. In the case of no power, if the obstruction vanishes, then the semi-stable log structure is unique up to a unique isomorphism. So we obtain a kind of canonical structures on this family of morphisms.
math.AG
this is my phd thesis part of it has published in acta mathematica sinica in this paper a class of morphisms which have a kind of singularity weaker than normal crossing is considered we construct the obstruction such that the socalled semistable log structures exists if and only if the obstruction vanishes in the case of no power if the obstruction vanishes then the semistable log structure is unique up to a unique isomorphism so we obtain a kind of canonical structures on this family of morphisms
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710.2727
Effect of contact induced states on minimum conductivity in graphene
The objective of this paper is to point out that contact induced states can help explain the structure dependence of the minimum conductivity observed experimentally even if the samples were purely ballistic. Contact induced states are similar to the well-known metal induced gap states (MIGS) in metal-semiconductor Schottky junctions, which typically penetrate only a few atomic lengths into the semiconductor, while the depth of penetration decreases with increasing band gap. However, in graphene we find that these states penetrate a much longer distance of the order of the width of the contacts. As a result, ballistic graphene samples with a length less than their width can exhibit a resistance proportional to length that is not Ohmic in origin, but arises from a reduced role of contact-induced states. While actual samples are probably not ballistic and involve scattering processes, our results show that these contact induced effects need to be taken into account in interpreting experiments and minimum conductivity depends strongly on the structure and configuration (two- vs. four-terminal) used.
cond-mat.mes-hall
the objective of this paper is to point out that contact induced states can help explain the structure dependence of the minimum conductivity observed experimentally even if the samples were purely ballistic contact induced states are similar to the wellknown metal induced gap states migs in metalsemiconductor schottky junctions which typically penetrate only a few atomic lengths into the semiconductor while the depth of penetration decreases with increasing band gap however in graphene we find that these states penetrate a much longer distance of the order of the width of the contacts as a result ballistic graphene samples with a length less than their width can exhibit a resistance proportional to length that is not ohmic in origin but arises from a reduced role of contactinduced states while actual samples are probably not ballistic and involve scattering processes our results show that these contact induced effects need to be taken into account in interpreting experiments and minimum conductivity depends strongly on the structure and configuration two vs fourterminal used
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710.2728
Primes in Tuples II
We prove that there are infinitely often pairs of primes much closer than the average spacing between primes - almost within the square root of the average spacing. We actually prove a more general result concerning the set of values taken on by the differences between primes.
math.NT
we prove that there are infinitely often pairs of primes much closer than the average spacing between primes almost within the square root of the average spacing we actually prove a more general result concerning the set of values taken on by the differences between primes
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710.2729
Light localization signatures in backscattering from periodic disordered media
The backscattering line shape is analytically predicted for thick disordered medium films where, remarkably, the medium configuration is periodic along the direction perpendicular to the incident light. A blunt triangular peak is found to emerge on the sharp top. The phenomenon roots in the coexistence of quasi-1D localization and 2D extended states.
cond-mat.dis-nn cond-mat.mes-hall
the backscattering line shape is analytically predicted for thick disordered medium films where remarkably the medium configuration is periodic along the direction perpendicular to the incident light a blunt triangular peak is found to emerge on the sharp top the phenomenon roots in the coexistence of quasi1d localization and 2d extended states
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710.273
Lattice simulation of 2+1 flavors of overlap light quarks
We report on the status of the dynamical overlap QCD simulation project by the JLQCD collaboration. After completing two-flavor QCD simulation on a 16^3x32 lattice at lattice spacing a 0.12 fm, we started a series of runs with 2+1 flavors. In this report, we describe an outline of our algorithms, parameter choices, and some early physics results of this second phase of our project.
hep-lat
we report on the status of the dynamical overlap qcd simulation project by the jlqcd collaboration after completing twoflavor qcd simulation on a 163x32 lattice at lattice spacing a 012 fm we started a series of runs with 21 flavors in this report we describe an outline of our algorithms parameter choices and some early physics results of this second phase of our project
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710.2731
Group Analysis of Variable Coefficient Diffusion-Convection Equations. I. Enhanced Group Classification
We discuss the classical statement of group classification problem and some its extensions in the general case. After that, we carry out the complete extended group classification for a class of (1+1)-dimensional nonlinear diffusion--convection equations with coefficients depending on the space variable. At first, we construct the usual equivalence group and the extended one including transformations which are nonlocal with respect to arbitrary elements. The extended equivalence group has interesting structure since it contains a non-trivial subgroup of non-local gauge equivalence transformations. The complete group classification of the class under consideration is carried out with respect to the extended equivalence group and with respect to the set of all point transformations. Usage of extended equivalence and correct choice of gauges of arbitrary elements play the major role for simple and clear formulation of the final results. The set of admissible transformations of this class is preliminary investigated.
math-ph math.AP math.MP
we discuss the classical statement of group classification problem and some its extensions in the general case after that we carry out the complete extended group classification for a class of 11dimensional nonlinear diffusionconvection equations with coefficients depending on the space variable at first we construct the usual equivalence group and the extended one including transformations which are nonlocal with respect to arbitrary elements the extended equivalence group has interesting structure since it contains a nontrivial subgroup of nonlocal gauge equivalence transformations the complete group classification of the class under consideration is carried out with respect to the extended equivalence group and with respect to the set of all point transformations usage of extended equivalence and correct choice of gauges of arbitrary elements play the major role for simple and clear formulation of the final results the set of admissible transformations of this class is preliminary investigated
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710.2732
Probabilistic communication complexity over the reals
Deterministic and probabilistic communication protocols are introduced in which parties can exchange the values of polynomials (rather than bits in the usual setting). It is established a sharp lower bound $2n$ on the communication complexity of recognizing the $2n$-dimensional orthant, on the other hand the probabilistic communication complexity of its recognizing does not exceed 4. A polyhedron and a union of hyperplanes are constructed in $\RR^{2n}$ for which a lower bound $n/2$ on the probabilistic communication complexity of recognizing each is proved. As a consequence this bound holds also for the EMPTINESS and the KNAPSACK problems.
cs.CC
deterministic and probabilistic communication protocols are introduced in which parties can exchange the values of polynomials rather than bits in the usual setting it is established a sharp lower bound 2n on the communication complexity of recognizing the 2ndimensional orthant on the other hand the probabilistic communication complexity of its recognizing does not exceed 4 a polyhedron and a union of hyperplanes are constructed in rr2n for which a lower bound n2 on the probabilistic communication complexity of recognizing each is proved as a consequence this bound holds also for the emptiness and the knapsack problems
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710.2733
Breakdown of Coherence ?
In a recent paper, Albrecht Kyrieleis, Jeff Forshaw and I discovered a new tower of super-leading logarithms in gaps between jets cross sections. After discussions with the referee of our paper and further investigation, we have come to view this as a breakdown of naive coherence for initial state radiation. In this talk I illustrate this statement in a simple way, and show how it results in the super-leading logarithms.
hep-ph
in a recent paper albrecht kyrieleis jeff forshaw and i discovered a new tower of superleading logarithms in gaps between jets cross sections after discussions with the referee of our paper and further investigation we have come to view this as a breakdown of naive coherence for initial state radiation in this talk i illustrate this statement in a simple way and show how it results in the superleading logarithms
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710.2734
Quark Masses in Supersymmetric SU(3)color x SU(3)W x U(1)X Model with Discrete T' flavor symmetry
We propose a supersymmetric model of quark flavor symmetry based on SU(3)colorxSU(3)WxU(1)X x T' where T' (binary tetrahedral group) is a discrete flavor symmetry group. The third (heavy) generation of quarks are assigned to singlet representation of T' while light quark generations are treated differently and assigned to doublet representation of T' . The model generates masses for heavy quarks as in 3-3-1 case. The quark mass terms for the second generation are obtained when T' symmetry is broken at leading order and for first generation with small higher order corrections .The flavor-changing neutral current (FCNC) effects are suppressed at leading order for third to second generation quark transitions due to T' breaking which is an attractive feature of the 3-3-1 model with T' symmetry.
hep-ph
we propose a supersymmetric model of quark flavor symmetry based on su3colorxsu3wxu1x x t where t binary tetrahedral group is a discrete flavor symmetry group the third heavy generation of quarks are assigned to singlet representation of t while light quark generations are treated differently and assigned to doublet representation of t the model generates masses for heavy quarks as in 331 case the quark mass terms for the second generation are obtained when t symmetry is broken at leading order and for first generation with small higher order corrections the flavorchanging neutral current fcnc effects are suppressed at leading order for third to second generation quark transitions due to t breaking which is an attractive feature of the 331 model with t symmetry
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710.2735
Effects of polarisation on study of anomalous VVH interactions at a Linear Collider
We investigate the use of beam polarisation as well as final state $\tau$ polarisation effects in probing the interaction of the Higgs boson with a pair of heavy vector bosons in the process $e^+ e^- \to f \bar f H$, where $f$ is any light fermion. The sensitivity of the International Linear Collider (ILC) operating at $\sqrt s=500$ GeV, to such $VVH$($V = W/Z$) couplings is examined in a model independent way. The effects of ISR and beamstrahlung are discussed.
hep-ph
we investigate the use of beam polarisation as well as final state tau polarisation effects in probing the interaction of the higgs boson with a pair of heavy vector bosons in the process e e to f bar f h where f is any light fermion the sensitivity of the international linear collider ilc operating at sqrt s500 gev to such vvhv wz couplings is examined in a model independent way the effects of isr and beamstrahlung are discussed
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710.2736
L2 norm performance index of synchronization and optimal control synthesis of complex networks
In this paper, the synchronizability problem of dynamical networks is addressed, where better synchronizability means that the network synchronizes faster with lower-overshoot. The L2 norm of the error vector e is taken as a performance index to measure this kind of synchronizability. For the equilibrium synchronization case, it is shown that there is a close relationship between the L2 norm of the error vector e and the H2 norm of the transfer function G of the linearized network about the equilibrium point. Consequently, the effect of the network coupling topology on the H2 norm of the transfer function G is analyzed. Finally, an optimal controller is designed, according to the so-called LQR problem in modern control theory, which can drive the whole network to its equilibrium point and meanwhile minimize the L2 norm of the output of the linearized network.
cs.NI
in this paper the synchronizability problem of dynamical networks is addressed where better synchronizability means that the network synchronizes faster with lowerovershoot the l2 norm of the error vector e is taken as a performance index to measure this kind of synchronizability for the equilibrium synchronization case it is shown that there is a close relationship between the l2 norm of the error vector e and the h2 norm of the transfer function g of the linearized network about the equilibrium point consequently the effect of the network coupling topology on the h2 norm of the transfer function g is analyzed finally an optimal controller is designed according to the socalled lqr problem in modern control theory which can drive the whole network to its equilibrium point and meanwhile minimize the l2 norm of the output of the linearized network
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710.2737
The history of mass assembly of faint red galaxies in 28 galaxy clusters since z=1.3
We measure the relative evolution of the number of bright and faint (as faint as 0.05 L*) red galaxies in a sample of 28 clusters, of which 16 are at 0.50<= z<=1.27, all observed through a pair of filters bracketing the 4000 Angstrom break rest-frame. The abundance of red galaxies, relative to bright ones, is constant over all the studied redshift range, 0<z<1.3, and rules out a differential evolution between bright and faint red galaxies as large as claimed in some past works. Faint red galaxies are largely assembled and in place at z=1.3 and their deficit does not depend on cluster mass, parametrized by velocity dispersion or X-ray luminosity. Our analysis, with respect to previous one, samples a wider redshift range, minimizes systematics and put a more attention to statistical issues, keeping at the same time a large number of clusters.
astro-ph
we measure the relative evolution of the number of bright and faint as faint as 005 l red galaxies in a sample of 28 clusters of which 16 are at 050 z127 all observed through a pair of filters bracketing the 4000 angstrom break restframe the abundance of red galaxies relative to bright ones is constant over all the studied redshift range 0z13 and rules out a differential evolution between bright and faint red galaxies as large as claimed in some past works faint red galaxies are largely assembled and in place at z13 and their deficit does not depend on cluster mass parametrized by velocity dispersion or xray luminosity our analysis with respect to previous one samples a wider redshift range minimizes systematics and put a more attention to statistical issues keeping at the same time a large number of clusters
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710.2738
CdZnTe room-temperature semiconductor operation in liquid scintillator
We demonstrate the first operation of CdZnTe room-temperature detectors in a liquid scintillator environment. This work follows conceptually the Heusser-type detector method of operating HPGe detectors in liquid nitrogen and liquid argon but instead for a far more practical room-temperature ensemble with the aim of achieving ultra-low background levels for radiation detection.
nucl-ex
we demonstrate the first operation of cdznte roomtemperature detectors in a liquid scintillator environment this work follows conceptually the heussertype detector method of operating hpge detectors in liquid nitrogen and liquid argon but instead for a far more practical roomtemperature ensemble with the aim of achieving ultralow background levels for radiation detection
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710.2739
The look-ahead effect of phenotypic mutations
The evolution of complex molecular traits such as disulphide bridges often requires multiple mutations. The intermediate steps in such evolutionary trajectories are likely to be selectively neutral or deleterious. Therefore, large populations and long times may be required to evolve such traits. We propose that errors in transcription and translation may allow selection for the intermediate mutations if the final trait provides a large enough selective advantage. We test this hypothesis using a population based model of protein evolution. If an individual acquires one of two mutations needed for a novel trait, the second mutation can be introduced into the phenotype due to transcription and translation errors. If the novel trait is advantageous enough, the allele with only one mutation will spread through the population, even though the gene sequence does not yet code for the complete trait. The first mutation then has a higher frequency than expected without phenotypic mutations giving the second mutation a higher probability of fixation. Thus, errors allow protein sequences to ''look-ahead'' for a more direct path to a complex trait.
q-bio.PE
the evolution of complex molecular traits such as disulphide bridges often requires multiple mutations the intermediate steps in such evolutionary trajectories are likely to be selectively neutral or deleterious therefore large populations and long times may be required to evolve such traits we propose that errors in transcription and translation may allow selection for the intermediate mutations if the final trait provides a large enough selective advantage we test this hypothesis using a population based model of protein evolution if an individual acquires one of two mutations needed for a novel trait the second mutation can be introduced into the phenotype due to transcription and translation errors if the novel trait is advantageous enough the allele with only one mutation will spread through the population even though the gene sequence does not yet code for the complete trait the first mutation then has a higher frequency than expected without phenotypic mutations giving the second mutation a higher probability of fixation thus errors allow protein sequences to lookahead for a more direct path to a complex trait
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710.274
Reliability of Module Based Software System
This paper consider the problem of determining the reliability of a software system which can be decomposed in a number of modules. We have derived the expression of the reliability of a system using the Markovian model for the transfer of control between modules in order. We have given the expression of reliability by considering both benign and catastrophic failure. The expression of reliability presented in this work is applicable for some control software which are designed to detect its own internal errors.
stat.AP
this paper consider the problem of determining the reliability of a software system which can be decomposed in a number of modules we have derived the expression of the reliability of a system using the markovian model for the transfer of control between modules in order we have given the expression of reliability by considering both benign and catastrophic failure the expression of reliability presented in this work is applicable for some control software which are designed to detect its own internal errors
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710.2741
Dark Energy, Induced Gravity and Broken Scale Invariance
We study the cosmological evolution of an induced gravity model with a self-interacting scalar field $\sigma$ and in the presence of matter and radiation. Such model leads to Einstein Gravity plus a cosmological constant as a stable attractor among homogeneous cosmologies and is therefore a viable dark-energy (DE) model for a wide range of scalar field initial conditions and values for its positive $\gamma$ coupling to the Ricci curvature $\gamma \sigma^{2}R$.
astro-ph gr-qc hep-th
we study the cosmological evolution of an induced gravity model with a selfinteracting scalar field sigma and in the presence of matter and radiation such model leads to einstein gravity plus a cosmological constant as a stable attractor among homogeneous cosmologies and is therefore a viable darkenergy de model for a wide range of scalar field initial conditions and values for its positive gamma coupling to the ricci curvature gamma sigma2r
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710.2742
Relic gravitons from super-inflation
The super-inflationary phase is predicted by the Loop Quantum Cosmology. In this paper we study the creation of gravitational waves during this phase. We consider the inverse volume corrections to the equation for the tensor modes and calculate the spectrum of the produced gravitons. The amplitude of the obtained spectrum as well as maximal energy of gravitons strongly depend on the evolution of the Universe after the super-inflation. We show that a further standard inflationary phase is necessary to lower the amount of gravitons below the present bound. In case of the lack of the standard inflationary phase, the present intensity of gravitons would be extremely large. These considerations give us another motivation to introduce the standard phase of inflation.
gr-qc
the superinflationary phase is predicted by the loop quantum cosmology in this paper we study the creation of gravitational waves during this phase we consider the inverse volume corrections to the equation for the tensor modes and calculate the spectrum of the produced gravitons the amplitude of the obtained spectrum as well as maximal energy of gravitons strongly depend on the evolution of the universe after the superinflation we show that a further standard inflationary phase is necessary to lower the amount of gravitons below the present bound in case of the lack of the standard inflationary phase the present intensity of gravitons would be extremely large these considerations give us another motivation to introduce the standard phase of inflation
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710.2743
Non-minimal coupling as a mechanism for spontaneous symmetry breaking on the brane
Motivated by the dimensional asymmetry characteristic of braneworlds, we populate the bulk spacetime with matter scalar fields, both real and complex, and couple them non-minimally to gravity. We derive the effective equations of motion on the brane and realize the case when the fields acquire a non-vanishing vacuum expectation value. This entails a change in the effective cosmological constant and in the effective mass of the scalar fields. We find that the non-minimal coupling provides a mechanism for generating spontaneous symmetry breaking at Planck energies on the brane. This mechanism is however rendered unviable for the generation of masses at the energy scales of the standard model.
hep-th
motivated by the dimensional asymmetry characteristic of braneworlds we populate the bulk spacetime with matter scalar fields both real and complex and couple them nonminimally to gravity we derive the effective equations of motion on the brane and realize the case when the fields acquire a nonvanishing vacuum expectation value this entails a change in the effective cosmological constant and in the effective mass of the scalar fields we find that the nonminimal coupling provides a mechanism for generating spontaneous symmetry breaking at planck energies on the brane this mechanism is however rendered unviable for the generation of masses at the energy scales of the standard model
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710.2744
Electromagnetic form factors of the Delta baryon
We develop a methodology that enables us to extract accurately the electromagnetic Delta form factors and their momentum dependence. We test our approach in the quenched approximation as a preparation for a study using dynamical fermions. Our calculation of the four form factors covers pion masses between about 410 MeV and 560 MeV on lattices with a size of 2.9 fm and a lattice spacing 0.09 fm. From the form factors we are able to obtain estimates of the magnetic moment and the charge radius of the Delta, which we compare to existing experimental and theoretical results.Our non-zero result for the electric quadrupole form factor signals a deformation of the Delta, pointing to an oblate charge distribution.
hep-lat hep-ph nucl-th
we develop a methodology that enables us to extract accurately the electromagnetic delta form factors and their momentum dependence we test our approach in the quenched approximation as a preparation for a study using dynamical fermions our calculation of the four form factors covers pion masses between about 410 mev and 560 mev on lattices with a size of 29 fm and a lattice spacing 009 fm from the form factors we are able to obtain estimates of the magnetic moment and the charge radius of the delta which we compare to existing experimental and theoretical resultsour nonzero result for the electric quadrupole form factor signals a deformation of the delta pointing to an oblate charge distribution
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710.2745
Two-dimensional multisolitons and azimuthons in Bose-Einstein condensates with attraction
We present spatially localized nonrotating and rotating (azimuthon) multisolitons in the two-dimensional (2D) ("pancake-shaped configuration") Bose-Einstein condensate (BEC) with attractive interaction. By means of a linear stability analysis, we investigate the stability of these structures and show that rotating dipole solitons are stable provided that the number of atoms is small enough. The results were confirmed by direct numerical simulations of the 2D Gross-Pitaevskii equation.
nlin.PS
we present spatially localized nonrotating and rotating azimuthon multisolitons in the twodimensional 2d pancakeshaped configuration boseeinstein condensate bec with attractive interaction by means of a linear stability analysis we investigate the stability of these structures and show that rotating dipole solitons are stable provided that the number of atoms is small enough the results were confirmed by direct numerical simulations of the 2d grosspitaevskii equation
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710.2746
Kullback Leibler property of kernel mixture priors in Bayesian density estimation
Positivity of the prior probability of Kullback-Leibler neighborhood around the true density, commonly known as the Kullback-Leibler property, plays a fundamental role in posterior consistency. A popular prior for Bayesian estimation is given by a Dirichlet mixture, where the kernels are chosen depending on the sample space and the class of densities to be estimated. The Kullback-Leibler property of the Dirichlet mixture prior has been shown for some special kernels like the normal density or Bernstein polynomial, under appropriate conditions. In this paper, we obtain easily verifiable sufficient conditions, under which a prior obtained by mixing a general kernel possesses the Kullback-Leibler property. We study a wide variety of kernel used in practice, including the normal, $t$, histogram, gamma, Weibull densities and so on, and show that the Kullback-Leibler property holds if some easily verifiable conditions are satisfied at the true density. This gives a catalog of conditions required for the Kullback-Leibler property, which can be readily used in applications.
math.ST stat.TH
positivity of the prior probability of kullbackleibler neighborhood around the true density commonly known as the kullbackleibler property plays a fundamental role in posterior consistency a popular prior for bayesian estimation is given by a dirichlet mixture where the kernels are chosen depending on the sample space and the class of densities to be estimated the kullbackleibler property of the dirichlet mixture prior has been shown for some special kernels like the normal density or bernstein polynomial under appropriate conditions in this paper we obtain easily verifiable sufficient conditions under which a prior obtained by mixing a general kernel possesses the kullbackleibler property we study a wide variety of kernel used in practice including the normal t histogram gamma weibull densities and so on and show that the kullbackleibler property holds if some easily verifiable conditions are satisfied at the true density this gives a catalog of conditions required for the kullbackleibler property which can be readily used in applications
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710.2747
Simulations of the consequences of tongue surgery on tongue mobility: implications for speech production in post-surgery conditions
This paper presents simulations of the impact of tongue surgery on tongue movements and on speech articulation. For this, a 3D biomechanical Finite Element (FE) model of the tongue is used. Muscles are represented within the FE structure by specific subsets of elements. The tongue model is inserted in the upper airways including jaw, palate and pharyngeal walls. Two examples of tongue surgery, which are quite common in the treatment of cancers of the oral cavity are modelled: hemiglossectomy and large resection of the mouth floor. Three kinds of reconstruction are also modelled, assuming flaps with a low, medium or high stiffnesses. The impact of the surgery without any reconstruction and with the three different reconstructions is quantitatively measured and compared during simulated speech production sequences. More precisely, differences in global 3D tongue shape and in velocity patterns during tongue displacements are evaluated.
physics.med-ph
this paper presents simulations of the impact of tongue surgery on tongue movements and on speech articulation for this a 3d biomechanical finite element fe model of the tongue is used muscles are represented within the fe structure by specific subsets of elements the tongue model is inserted in the upper airways including jaw palate and pharyngeal walls two examples of tongue surgery which are quite common in the treatment of cancers of the oral cavity are modelled hemiglossectomy and large resection of the mouth floor three kinds of reconstruction are also modelled assuming flaps with a low medium or high stiffnesses the impact of the surgery without any reconstruction and with the three different reconstructions is quantitatively measured and compared during simulated speech production sequences more precisely differences in global 3d tongue shape and in velocity patterns during tongue displacements are evaluated
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710.2748
Algebraic curves for commuting elements in the q-deformed Heisenberg algebra
In this paper we extend the eliminant construction of Burchnall and Chaundy for commuting differential operators in the Heisenberg algebra to the q-deformed Heisenberg algebra and show that it again provides annihilating curves for commuting elements, provided q satisfies a natural condition. As a side result we obtain estimates on the dimensions of the eigenspaces of elements of this algebra in its faithful module of Laurent series.
math.RA math.QA
in this paper we extend the eliminant construction of burchnall and chaundy for commuting differential operators in the heisenberg algebra to the qdeformed heisenberg algebra and show that it again provides annihilating curves for commuting elements provided q satisfies a natural condition as a side result we obtain estimates on the dimensions of the eigenspaces of elements of this algebra in its faithful module of laurent series
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710.2749
Coupling of Surface and Volume Dipole Oscillations in C-60 Molecules
We first give a short review of the ``local-current approximation'' (LCA), derived from a general variation principle, which serves as a semiclassical description of strongly collective excitations in finite fermion systems starting from their quantum-mechanical mean-field ground state. We illustrate it for the example of coupled translational and compressional dipole excitations in metal clusters. We then discuss collective electronic dipole excitations in C$_{60}$ molecules (Buckminster fullerenes). We show that the coupling of the pure translational mode (``surface plasmon'') with compressional volume modes in the semiclasscial LCA yields semi-quantitative agreement with microscopic time-dependent density functional (TDLDA) calculations, while both theories yield qualitative agreement with the recent experimental observation of a ``volume plasmon''.
physics.atm-clus nucl-th physics.atom-ph physics.flu-dyn
we first give a short review of the localcurrent approximation lca derived from a general variation principle which serves as a semiclassical description of strongly collective excitations in finite fermion systems starting from their quantummechanical meanfield ground state we illustrate it for the example of coupled translational and compressional dipole excitations in metal clusters we then discuss collective electronic dipole excitations in c_60 molecules buckminster fullerenes we show that the coupling of the pure translational mode surface plasmon with compressional volume modes in the semiclasscial lca yields semiquantitative agreement with microscopic timedependent density functional tdlda calculations while both theories yield qualitative agreement with the recent experimental observation of a volume plasmon
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710.275
Transition from galactic to extragalactic cosmic rays
The transition from galactic to extragalactic cosmic rays is discussed. One of critical indications for transition is given by the Standard Model of Galactic cosmic rays, according to which the maximum energy of acceleration for iron nuclei is of order of $E_{\rm Fe}^{\rm max} \approx 1\times 10^{17}$ eV. At $E > E_{\rm Fe}^{\rm max}$ the spectrum is predicted to be very steep and thus the Standard Model favours the transition at energy not much higher than $E_{\rm Fe}^{\rm max}$. As observations are concerned there are two signatures of transition: change of energy spectra and elongation rate (depth of shower maximum in the atmosphere $X_{\rm max}$ as function of energy). Three models of transition are discussed: dip-based model, mixed composition model and ankle model. In the latter model the transition occurs at the observed spectral feature, ankle, which starts at $E_a \approx 1\times 10^{19}$ eV and is characterised by change of mass compostion from galactic iron to extragalactic protons. In the dip model the transition occures at the second knee observed at energy $(4 -8)\times 10^{17}$ eV and is characterised by change of mass composition from galactic iron to extragalactic protons. The mixed composition model describes transition at $E \sim 3\times 10^{18}$ eV with mass composition changing from galactic iron to extragactic mixed composition of different nuclei. These models are confronted with observational data on spectra and elongation rates from different experiments, including Auger.
astro-ph
the transition from galactic to extragalactic cosmic rays is discussed one of critical indications for transition is given by the standard model of galactic cosmic rays according to which the maximum energy of acceleration for iron nuclei is of order of e_rm ferm max approx 1times 1017 ev at e e_rm ferm max the spectrum is predicted to be very steep and thus the standard model favours the transition at energy not much higher than e_rm ferm max as observations are concerned there are two signatures of transition change of energy spectra and elongation rate depth of shower maximum in the atmosphere x_rm max as function of energy three models of transition are discussed dipbased model mixed composition model and ankle model in the latter model the transition occurs at the observed spectral feature ankle which starts at e_a approx 1times 1019 ev and is characterised by change of mass compostion from galactic iron to extragalactic protons in the dip model the transition occures at the second knee observed at energy 4 8times 1017 ev and is characterised by change of mass composition from galactic iron to extragalactic protons the mixed composition model describes transition at e sim 3times 1018 ev with mass composition changing from galactic iron to extragactic mixed composition of different nuclei these models are confronted with observational data on spectra and elongation rates from different experiments including auger
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710.2751
A note on mean volume and surface densities for a class of birth-and-growth stochastic processes
Many real phenomena may be modelled as locally finite unions of $d$-dimensional time dependent random closed sets in $\mathbb{R}^d$, described by birth-and-growth stochastic processes, so that their mean volume and surface densities, as well as the so called mean \emph{extended} volume and surface densities, may be studied in terms of relevant quantities characterizing the process. We extend here known results in the Poissonian case to a wider class of birth-and-growth stochastic processes, proving in particular the absolute continuity of the random time of capture of a point $x\in\R^d$ by processes of this class.
math.PR
many real phenomena may be modelled as locally finite unions of ddimensional time dependent random closed sets in mathbbrd described by birthandgrowth stochastic processes so that their mean volume and surface densities as well as the so called mean emphextended volume and surface densities may be studied in terms of relevant quantities characterizing the process we extend here known results in the poissonian case to a wider class of birthandgrowth stochastic processes proving in particular the absolute continuity of the random time of capture of a point xinrd by processes of this class
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710.2752
Future plan for observation of cosmic gamma rays in the 100 TeV energy region with the Tibet air shower array : simulation and sensitivity
The Tibet air shower array, which has an effective area of 37,000 square meters and is located at 4300 m in altitude, has been observing air showers induced by cosmic rays with energies above a few TeV. We have a plan to add a large muon detector array to it for the purpose of increasing its sensitivity to cosmic gamma rays in the 100 TeV energy region by discriminating them from cosmic-ray hadrons. We have deduced the attainable sensitivity of the muon detector array using our Monte Carlo simulation. We report here on the detailed procedure of our Monte Carlo simulation.
astro-ph
the tibet air shower array which has an effective area of 37000 square meters and is located at 4300 m in altitude has been observing air showers induced by cosmic rays with energies above a few tev we have a plan to add a large muon detector array to it for the purpose of increasing its sensitivity to cosmic gamma rays in the 100 tev energy region by discriminating them from cosmicray hadrons we have deduced the attainable sensitivity of the muon detector array using our monte carlo simulation we report here on the detailed procedure of our monte carlo simulation
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