Bonn 2010 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 2: Schwerionenkollisionen und QCD Phasen I

HK 2.1: Group Report

Monday, March 15, 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 Rischke^1,2 — 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.