Matching pre-equilibrium dynamics and viscous hydrodynamics

Details Matching pre-equilibrium dynamics and viscous hydrodynamics Matching pre-equilibrium dynamics and viscous hydrodynamics

2009-09-01

arxiv.org/abs/0909.0264v2

Phys. Rev. C 81, 024906 (2010)

Physics

High Energy Physics

High Energy Physics - Phenomenology

24 pages, 5 figures,v2: minor modifications and updated references. Accepted for publication in Phys. Rev. C

Scientific paper

10.1103/PhysRevC.81.024906

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.

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