Dissipation, Collective Flow and Mach Cones at RHIC
Abstract
Fast thermalization and a strong buildup of elliptic flow of QCD matter as found at RHIC are understood as the consequence of perturbative QCD (pQCD) interactions within the 3+1 dimensional parton cascade BAMPS. The main contributions stem from pQCD bremsstrahlung processes. By comparing to Au+Au data of the flow parameter the shear viscosity to entropy ratio has been extracted dynamically and lies in the range of 0.08 and 0.2. Also jet-quenching has been investigated consistently within a full dynamical picture of the heavy ion collision. The results for gluonic jets indicate a slightly too large suppression, but are encouraging to understand the two major phenomena, strong flow and jet-quenching, within a unified microscopic treatment of kinetic processes. In addition, simulations on the temporal propagation of dissipative shock waves lead to the observation that an ratio larger than 0.2 prevents the development of well-defined shock waves on timescales typical for ultrarelativistic heavy-ion collisions.
Cite
@article{arxiv.0906.2675,
title = {Dissipation, Collective Flow and Mach Cones at RHIC},
author = {I. Bouras and A. El and O. Fochler and J. Uphoff and Z. Xu and C. Greiner},
journal= {arXiv preprint arXiv:0906.2675},
year = {2009}
}
Comments
4 pages, 4 figes. Invited talk by C. Greiner at the XLIVth Rencontres de Moriond (QCD and High Energy Interactions), La Thuile, Italy, March 2009