Bonn 2010 – wissenschaftliches Programm
HK 2.1: Gruppenbericht
Montag, 15. März 2010, 16:30–17:00, HG I
Relativistic Shocks and Mach Cones in viscous Gluon Matter — •Ioannis Bouras1, Etele Molnar2, Harri Niemi2, Zhe Xu1, Andrej El1, Oliver Fochler1, Francesco Lauciello1, Carsten Greiner1, and Dirk Rischke1,2 — 1Institut für Theoretische Physik, Johann Wolfgang Goethe Universität, Frankfurt am Main — 2Frankfurt Institute for Advanced Studies, Frankfurt am Main
We solve the relativistic Riemann problem in a visous and heat conducting gluon matter employing a microscopic parton cascade and compare it to the relativistic causal dissipative fluid dynamical model of Israel and Stewart. We demonstrate the transition from ideal to viscous shocks by varying the shear viscosity to entropy density ratio η/s from zero to infinity and compare different dissipative quantities. We show the behaviour and the break down of viscous hydrodynamics for an out of equilibrium state using the local Knudsen number. Employing the microscopic parton cascade we investigate the evolution of mach cones in a viscous gluonic matter. We see that for η/s = 1/4π a collective behaviour of the medium is observed, resulting in cone structure and diffusion wake of the energy density profile. The mach cone vanish very fast when increasing the shear viscosity in the medium. As comparison to experiments two-particle correlations are shown.
We have derived third-order corrections to the Israel-Stewart theory using the entropy principle. This new equation is solved for one-dimensional Bjorken boost-invariant expansion. The scaling solutions for various values of η/s are shown to be in very good agreement with those obtained from kinetic transport calculations.