Physical Review D

Physical Review D

Recent articles in Physical Review D
Classical limits of scalar and tensor gauge operators based on the overlap Dirac matrix Author(s): Andrei Alexandru, Ivan Horváth, and Keh-Fei Liu It was recently proposed by the second author to consider lattice formulations of QCD in which complete actions, including the gauge part, are built explicitly from a given Dirac operator D. In a simple example of such theory, the gauge action is proportional to the trace of Ginsparg–Wilson operat... [Phys. Rev. D 78, 085002] Published Fri Oct 03, 2008 Friedmann branes with variable tension Author(s): László Árpád Gergely We introduce braneworlds with nonconstant tension, strengthening the analogy with fluid membranes, which exhibit a temperature dependence according to the empirical law established by Eötvös. This new degree of freedom allows for evolving gravitational and cosmological constants, the latter being ... [Phys. Rev. D 78, 084006] Published Fri Oct 03, 2008 Electromagnetic signatures of thin accretion disks in wormhole geometries Author(s): Tiberiu Harko, Zoltán Kovács, and Francisco S. Lobo In this paper, we study the physical properties and characteristics of matter forming thin accretion disks in static and spherically symmetric wormhole spacetimes. In particular, the time averaged energy flux, the disk temperature, and the emission spectra of the accretion disks are obtained for the... [Phys. Rev. D 78, 084005] Published Fri Oct 03, 2008 Universal quantum mechanics Author(s): Steven B. Giddings If gravity respects quantum mechanics, it is important to identify the essential postulates of a quantum framework capable of incorporating gravitational phenomena. Such a construct likely requires elimination or modification of some of the “standard” postulates of quantum mechanics, in particul... [Phys. Rev. D 78, 084004] Published Fri Oct 03, 2008 Axion cosmology and the energy scale of inflation Author(s): Mark P. Hertzberg, Max Tegmark, and Frank Wilczek We survey observational constraints on the parameter space of inflation and axions and map out two allowed windows: the classic window and the inflationary anthropic window. The cosmology of the latter is particularly interesting; inflationary axion cosmology predicts the existence of isocurvature f... [Phys. Rev. D 78, 083507] Published Fri Oct 03, 2008 Dark matter dynamics in the galactic center Author(s): Eugene Vasiliev and Maxim Zelnikov The evolution of dark matter in central areas of galaxies is considered (the Milky Way is taken as an example). It is driven by the scattering off of dark matter particles by bulge stars, their absorption by the supermassive black hole, and self-annihilation. This process is described by the diffusi... [Phys. Rev. D 78, 083506] Published Fri Oct 03, 2008 Improved estimation of cluster mass profiles from the cosmic microwave background Author(s): Jaiyul Yoo and Matias Zaldarriaga We develop a new method for reconstructing cluster-mass profiles and large-scale structure from the cosmic microwave background (CMB). By analyzing the likelihood of CMB lensing, we analytically prove that standard quadratic estimators for CMB lensing are unbiased and achieve the optimal condition o... [Phys. Rev. D 78, 083002] Published Fri Oct 03, 2008 Applying the Wang-Landau algorithm to lattice gauge theory Author(s): Barak Bringoltz and Stephen R. Sharpe We implement the Wang-Landau algorithm in the context of SU(N) lattice gauge theories. We study the quenched, reduced version of the lattice theory and calculate its density of states for N=20, 30, 40, 50. We introduce a variant of the original algorithm in which the weight function used in the upda... [Phys. Rev. D 78, 074503] Published Fri Oct 03, 2008 Exploring the meson spectrum with twisted mass lattice QCD Author(s): Robert G. Petry, Derek Harnett, Randy Lewis, and R. M. Woloshyn Numerical simulations with access to all possible meson quantum numbers J^{PC} are presented using two-flavor (up and down) quenched twisted mass lattice QCD with three different lattice spacings and four different quark masses. The connection between the quantum numbers (P and C) and the symmetries... [Phys. Rev. D 78, 074502] Published Fri Oct 03, 2008 Erratum: Limits on the speed of gravitational waves from pulsar timing [Phys. Rev. D 78, 044018 (2008)] Author(s): D. Baskaran, A. G. Polnarev, M. S. Pshirkov, and K. A. Postnov [Phys. Rev. D 78, 089901] Published Thu Oct 02, 2008 Search for dark matter annihilation in Draco with the Solar Tower Atmospheric Cherenkov Effect Experiment Author(s): D. D. Driscoll, C. E. Covault, J. Ball, J. E. Carson, A. Jarvis, R. A. Ong, J. Zweerink, D. S. Hanna, J. Kildea, T. Lindner, C. Mueller, K. Ragan, P. Fortin, R. Mukherjee, D. A. Williams, and D. M. Gingrich For some time, the Draco dwarf spheroidal galaxy has garnered interest as a possible source for the indirect detection of dark matter. Its large mass-to-light ratio and relative proximity to the Earth provide favorable conditions for the production of a detectable flux of gamma rays from dark matter... [Phys. Rev. D 78, 087101] Published Thu Oct 02, 2008 Topological susceptibility in SU(2) Yang-Mills theory in the Hamiltonian approach in Coulomb gauge Author(s): Davide R. Campagnari and Hugo Reinhardt The topological susceptibility is calculated within the Hamiltonian approach to Yang-Mills theory in Coulomb gauge, using the vacuum wave functional previously determined by a variational solution of the Yang-Mills Schrödinger equation. The numerical result agrees qualitatively with the predictions... [Phys. Rev. D 78, 085001] Published Thu Oct 02, 2008 Gravitational waves from deflagration bubbles in first-order phase transitions Author(s): Ariel Mégevand The walls of bubbles in a first-order phase transition can propagate either as detonations, with a velocity larger than the speed of sound, or deflagrations, which are subsonic. We calculate the gravitational radiation that is produced by turbulence during a phase transition which develops via defla... [Phys. Rev. D 78, 084003] Published Thu Oct 02, 2008 Thermodynamics and phase transitions in the Born-Infeld-anti-de Sitter black holes Author(s): Yun Soo Myung, Yong-Wan Kim, and Young-Jai Park We investigate the Born-Infeld–anti–de Sitter (BIAdS) black hole solutions in the four dimensions, which is a nonlinear generalization of the Reissner-Norström-AdS (RNAdS) black hole. We analyze all thermodynamic quantities of the BIAdS black hole in the canonical ensembles, which are characte... [Phys. Rev. D 78, 084002] Published Thu Oct 02, 2008 WMAP haze: Directly observing dark matter? Author(s): Michael McNeil Forbes and Ariel R. Zhitnitsky In this paper, we show that dark matter in the form of dense matter/antimatter nuggets could provide a natural and unified explanation for several distinct bands of diffuse radiation from the core of the Galaxy spanning over 13 orders of magnitude in frequency. We fix all of the phenomenological pro... [Phys. Rev. D 78, 083505] Published Thu Oct 02, 2008 Chemical potential and the nature of dark energy: The case of a phantom field Author(s): J. A. Lima and S. H. Pereira The influence of a possible nonzero chemical potential μ on the nature of dark energy is investigated by assuming that the dark energy is a relativistic perfect simple fluid obeying the equation of state, p=ωρ (ω<0, constant). The entropy condition, S≥0, implies that the possible values of ω are heavily dependent on the magnitude, as well as on the sign of the chemical potential. For μ>0, the ω parameter must be greater than -1 (vacuum is forbidden) while for μ<0 not only the vacuum but even a phantomlike behavior (ω<-1) is allowed. In any case, the ratio between the chemical potential and temperature remains constant, that is, μ/T=μ_{0} /T_{0} . Assuming that the dark energy constituents have either a bosonic or fermionic nature, the general form of the spectrum is also proposed. For bosons μ is always negative and the extended Wien’s law allows only a dark component with ω<-1/2, which includes vacuum and the phantomlike cases. The same happens in the fermionic branch for μ<0. However, fermionic particles with μ>0 are ... [Phys. Rev. D 78, 083504] Published Thu Oct 02, 2008 Propagators in Lagrangian space Author(s): Francis Bernardeau and Patrick Valageas It has been found recently that propagators, e.g. the cross correlation spectra of the cosmic fields with the initial density field, decay exponentially at large k in an Eulerian description of the dynamics. We explore here similar quantities defined for a Lagrangian space description. We find that ... [Phys. Rev. D 78, 083503] Published Thu Oct 02, 2008 Study of structure formation and reheating in the D3/D7 brane inflation model Author(s): Robert H. Brandenberger, Keshav Dasgupta, and Anne-Christine Davis We study the spectrum of cosmological fluctuations in the D3/D7 brane inflationary universe with particular attention to the parametric excitation of entropy modes during the reheating stage. The same tachyonic instability which renders reheating in this model very rapidly leads to an exponential gr... [Phys. Rev. D 78, 083502] Published Thu Oct 02, 2008 Higher powers in gravitation Author(s): Timothy Clifton We consider the Friedmann-Robertson-Walker cosmologies of theories of gravity that generalize the Einstein-Hilbert action by replacing the Ricci scalar R with some function f(R). The general asymptotic behavior of these cosmologies is found, at both early and late times, and the effects of adding hi... [Phys. Rev. D 78, 083501] Published Thu Oct 02, 2008 Baryogenesis via leptogenesis in an inhomogeneous universe Author(s): A. Kartavtsev and D. Besak We investigate the influence of primordial perturbations of the energy density and space-time metric on the generation of the lepton and baryon asymmetries. In the weak and strong washout regimes baryon isocurvature perturbations with amplitudes of the same order as those of the cosmic microwave bac... [Phys. Rev. D 78, 083001] Published Thu Oct 02, 2008 Optimal light beams and mirror shapes for future LIGO interferometers Author(s): Mihai Bondarescu, Oleg Kogan, and Yanbei Chen We report the results of a recent search for the lowest value of thermal noise that can be achieved in LIGO by changing the shape of mirrors, while fixing the mirror radius and maintaining a low diffractional loss. The result of this minimization is a beam with thermal noise a factor of 2.32 (in pow... [Phys. Rev. D 78, 082002] Published Thu Oct 02, 2008 Laser frequency stabilization by dual arm locking for LISA Author(s): Andrew Sutton and Daniel A. Shaddock The Laser Interferometer Space Antenna (LISA) will be the first dedicated space based gravitational wave detector. LISA will consist of a triangular formation of spacecraft, forming an interferometer with 5×10^{6} km long arms. Annual length variations of the interferometer arms prevent exact... [Phys. Rev. D 78, 082001] Published Thu Oct 02, 2008 Doubly lopsided mass matrices from unitary unification Author(s): S. M. Barr It is shown that the stratified or “doubly lopsided” mass matrix structure that is known to reproduce well the qualitative features of the quark and lepton masses and mixings can arise quite naturally in the context of grand unification based on the groups SU(N) with N>5. An SU(8) example is cons... [Phys. Rev. D 78, 075001] Published Thu Oct 02, 2008 Casimir scaling in G_{2} lattice gauge theory Author(s): L’udovít Lipták and Štefan Olejník We computed potentials between static color sources from the six lowest representations of G_{2} lattice gauge theory, in numerical simulations with the Wilson action on asymmetric lattices with nonperturbatively estimated values of the bare anisotropy. We present evidence for (approximate) Casimir ... [Phys. Rev. D 78, 074501] Published Thu Oct 02, 2008 Systematic analysis of scaling properties in deep inelastic scattering Author(s): Guillaume Beuf, Robi Peschanski, Christophe Royon, and David Šálek Using the “quality factor” method, we analyze the scaling properties of deep inelastic processes at the accelerator HERA and fixed target experiments for x≤10^{-2} . We look for scaling formulas of the form σ^{γ^{*} p} (τ), where τ(L=log⁡Q^{2} ,Y) is a scaling variable suggested by the a... [Phys. Rev. D 78, 074004] Published Thu Oct 02, 2008 Exotic Θ^{+} baryon from interference Author(s): Moskov Amarian, Dmitri Diakonov, and Maxim V. Polyakov Since all couplings of the exotic Θ^{+} baryon to normal hadrons seem to be small it is hard to reveal it in standard resonance searching. We suggest looking for the Θ^{+} production in interference with a known resonance yielding the same final state but having a high production rate. The interfe... [Phys. Rev. D 78, 074003] Published Thu Oct 02, 2008 Vector meson ω-ϕ mixing and their form factors in the light-cone quark model Author(s): Wen Qian and Bo-Qiang Ma The vector meson ω-ϕ mixing is studied in two alternative scenarios with different numbers of mixing angles, i.e., the one-mixing-angle scenario and the two-mixing-angle scenario, in both the octet-singlet mixing scheme and the quark flavor mixing scheme. Concerning the reproduction of experimenta... [Phys. Rev. D 78, 074002] Published Thu Oct 02, 2008 Υ(4S,5S)→Υ(1S)η transitions in the rescattering model and the new BABAR measurement Author(s): Ce Meng and Kuang-Ta Chao The η transitions of Υ(4S,5S) into Υ(1S,2S) are studied in the rescattering model by considering the final state interactions above the BB [over ¯] threshold. The width of the η transition of Υ(4S) into Υ(1S) is found to be larger than that of the dipion transition, and the ratio of Γ(Υ(4S)... [Phys. Rev. D 78, 074001] Published Thu Oct 02, 2008 Zero minors of the neutrino mass matrix Author(s): E. I. Lashin and N. Chamoun We examine the possibility that a certain class of neutrino mass matrices, namely, those with two independent vanishing minors in the flavor basis, regardless of being invertible or not, is sufficient to describe current data. We compute generic formulas for the ratios of the neutrino masses and for... [Phys. Rev. D 78, 073002] Published Thu Oct 02, 2008 Resolving the mass hierarchy with atmospheric neutrinos using a liquid argon detector Author(s): Raj Gandhi, Pomita Ghoshal, Srubabati Goswami, and S. Uma Sankar We explore the potential offered by large-mass liquid argon detectors for determination of the sign of Δm_{31}^{2} , or the neutrino mass hierarchy, through interactions of atmospheric neutrinos. We give results for a 100 kT sized magnetized detector which provides separate sensitivity to ν_{μ} ... [Phys. Rev. D 78, 073001] Published Thu Oct 02, 2008

[ Back ]

Main Menu
Home Problems and Answers Physics Tools Physical Data Physics Equations Computational Publication Simulations Resources Physics Videos Physics Jobs Latest Physics News Physics Events APS - Journals Physical Review Letters Physical Review A Physical Review B Physical Review C Physical Review D Physical Review E Physical Review ST Accel. and Beams Physical Review ST Phys. Educ. Res. Reviews of Modern Physics IOP - Journals Products & Press Newsgroups Free Web Contents Contact Us Advertising

Main Menu