10,278 research outputs found

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

We study the topological feature in the QCD vacuum based on the hypothesis of
abelian dominance. The topological charge $Q_{\rm SU(2)}$ 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 $Q_{\rm Mono}$, 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 $Q_{\rm SU(2)}$ and $Q_{\rm Mono}$ in the maximally
abelian gauge. Furthermore, $Q_{\rm Mono}$ 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

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

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

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

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

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

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