Kinetic equilibration from a radiative transport

Details Kinetic equilibration from a radiative transport Kinetic equilibration from a radiative transport

2009-03-11

arxiv.org/abs/0903.2055v1

Physics

Nuclear Physics

Nuclear Theory

Presented at 25th Winter Workshop on Nuclear Dynamics, Big Sky, Montana, 1-8 Feb 2009

Scientific paper

Kinetic equilibration during the early stage of a relativistic heavy ion collision is studied using a radiative transport model. Thermalization is found to dominate over expansion with medium regulated cross sections. Pressure anisotropy shows an approximate alpha_s scaling when radiative processes are included. It approaches an asymptotic time evolution on a time scale of 1 to 2 fm/c. Energy density is also found to approach an asymptotic time evolution that decreases slower than the ideal hydro evolution. These observations indicate that viscosity is important during the early longitudinal expansion phase of a relativistic heavy ion collision.

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