Bulk viscosity in quasi particle models

Details Bulk viscosity in quasi particle models Bulk viscosity in quasi particle models

2008-06-29

arxiv.org/abs/0806.4745v2

Phys.Rev.C79:055207,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, version accepted for publication in Physical Review C

Scientific paper

10.1103/PhysRevC.79.055207

We discuss transport properties of dynamical fluid composed of quasi-particles whose masses depend on temperature and charge chemical potentials. Based on the relativistic kinetic theory formulated under the relaxation time approximation, we derive a general expression for the bulk viscosity in the quasi-particle medium. We show that dynamically generated particle masses imply an essential modification of the fluid compressibility. As an application of our results we consider a class of quasi-particle models with the chiral phase transition belonging to O(4) and Z(2) universality class. Based on the Ginzburg-Landau and the scaling theory we study the critical properties of the bulk viscosity zeta near the phase transition. We show that under the relaxation time approximation the zeta is not expected to show singular behavior near the O(4) and Z(2) critical point through static critical exponents.

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