10,278 research outputs found

    A Conclusive Test of Abelian Dominance Hypothesis for Topological Charge in the QCD Vacuum

    Get PDF
    We study the topological feature in the QCD vacuum based on the hypothesis of abelian dominance. The topological charge QSU(2)Q_{\rm SU(2)} can be explicitly represented in terms of the monopole current in the abelian dominated system. To appreciate its justification, we directly measure the corresponding topological charge QMonoQ_{\rm Mono}, which is reconstructed only from the monopole current and the abelian component of gauge fields, by using the Monte Carlo simulation on SU(2) lattice. We find that there exists a one-to-one correspondence between QSU(2)Q_{\rm SU(2)} and QMonoQ_{\rm Mono} in the maximally abelian gauge. Furthermore, QMonoQ_{\rm Mono} is classified by approximately discrete values.Comment: LATTICE98(confine), 3 pages, Latex, 3 figures include

    A calculation of the transport coefficients of hot and dense hadronic matter based on the event generator URASiMA

    Get PDF
    We evaluate thermodynamical quantities and the transport coefficients of a dense and hot hadronic matter based on the event generator URASiMA (Ultra-Relativistic AA collision Simulator based on Multiple Scattering Algorithm) with periodic boundary conditions. As the simplest example of the transport coefficients we investigate the temperature dependence and the chemical potential dependence of the baryon diffusion constant of a dense and hot hadronic matter.Comment: To appear in the Proceeding of the International Conference on Quark Nuclear Physics(QNP2000), 21-25 February 2000, Adelaide, Australi

    Existence of Chiral-Asymmetric Zero Modes in the Background of QCD-Monopoles

    Get PDF
    We study topological aspects of the QCD vacuum structure in SU(2) lattice gauge theory with the abelian gauge fixing. The index of the Dirac operator is measured by using the Wilson fermion in the quenched approximation. We find chiral-asymmetric zero modes in background fields dominated by QCD-monopoles without any cooling.Comment: 3 pages, Latex, 4 figures. Talk presented by S. Sasaki at XV International Symposium on 'Lattice Field Theory (LATTICE 97)', July 22 - 26, 1997, Edinburgh, U

    Charge diffusion constant in hot and dense hadronic matter - A Hadro-molecular-dynamic calculation

    Get PDF
    We evaluate charge diffusion constant of dense and hot hadronic matter based on the molecular dynamical method by using a hadronic collision generator which describes nuclear collisions at energies 10 < E < 100 GeV/A and satisfies detailed balance at low temperatures (T < 200 MeV). For the hot and dense hadronic matter of the temperature range, 100 < T < 200 MeV and baryon number density, 0.16 < nB < 0.32 fm^-3, charge diffusion constant D gradually increases from 0.5 fm c to 2 fm c with temperature and is almost independent of baryon number density. Based on the obtained diffusion constant we make simple discussions on the diffusion of charge fluctuation in ultrarelativistic nuclear collisions.Comment: 13 pages, 4 figure

    Temperature Chaos, Rejuvenation and Memory in Migdal-Kadanoff Spin Glasses

    Get PDF
    We use simulations within the Migdal-Kadanoff real space renormalization approach to probe the scales relevant for rejuvenation and memory in spin glasses. One of the central questions concerns the role of temperature chaos. First we investigate scaling laws of equilibrium temperature chaos, finding super-exponential decay of correlations but no chaos for the total free energy. Then we perform out of equilibrium simulations that follow experimental protocols. We find that: (1) rejuvenation arises at a length scale smaller than the ``overlap length'' l(T,T'); (2) memory survives even if equilibration goes out to length scales much larger than l(T,T').Comment: 4 pages, 4 figures, added references, slightly changed content, modified Fig.

    Perturbative effects of spinning black holes with applications to recoil velocities

    Full text link
    Recently, we proposed an enhancement of the Regge-Wheeler-Zerilli formalism for first-order perturbations about a Schwarzschild background that includes first-order corrections due to the background black-hole spin. Using this formalism, we investigate gravitational wave recoil effects from a spinning black-hole binary system analytically. This allows us to better understand the origin of the large recoils observed in full numerical simulation of spinning black hole binaries.Comment: Proceedings of Theory Meets Data Analysis at Comparable and Extreme Mass Ratios (NRDA/Capra 2010), Perimeter Institute, June 2010 - 12 page