2009/09/30 by Mauricio Martinez, Michael Strickland · 1 citation
Physics and Astronomy · #hep-ph #nucl-th
paper · pdf · doi:10.1103/physrevc.81.024906
published as Phys. Rev. C81:024906,2010 · 24 pages, 5 figures,v2: minor modifications and updated references. Accepted for publication in Phys. Rev. C
arxiv created 2010/02/02 · arxiv updated 2014/11/20
We demonstrate how to match pre-equilibrium dynamics of a 0+1 dimensional quark gluon plasma to 2nd-order viscous hydrodynamical evolution. The matching allows us to specify the initial values of the energy density and shear tensor at the initial time of hydrodynamical evolution as a function of the lifetime of the pre-equilibrium period. We compare two models for the pre-equilibrium quark-gluon plasma, longitudinal free streaming and collisionally-broadened longitudinal expansion, and present analytic formulas which can be used to fix the necessary components of the energy-momentum tensor. The resulting dynamical models can be used to assess the effect of pre-equilibrium dynamics on quark-gluon plasma observables. Additionally, we investigate the dependence of entropy production on pre-equilibrium dynamics and discuss the limitations of the standard definitions of the non-equilibrium entropy.