Bulk Viscosity of Interacting Hadrons

Details Bulk Viscosity of Interacting Hadrons Bulk Viscosity of Interacting Hadrons

2009-06-30

arxiv.org/abs/0906.5592v2

Nucl.Phys.A830:219c-222c,2009

Physics

Nuclear Physics

Nuclear Theory

4 pages, 1 figure, Contribution to Quark Matter 2009, Knoxville, Tennessee, USA

Scientific paper

10.1016/j.nuclphysa.2009.09.023

We show that first approximations to the bulk viscosity $\eta_v$ are expressible in terms of factors that depend on the sound speed $v_s$, the enthalpy, and the interaction (elastic and inelastic) cross section. The explicit dependence of $\eta_v$ on the factor $(\frac 13 - v_s^2)$ is demonstrated in the Chapman-Enskog approximation as well as the variational and relaxation time approaches. The interesting feature of bulk viscosity is that the dominant contributions at a given temperature arise from particles which are neither extremely nonrelativistic nor extremely relativistic. Numerical results for a model binary mixture are reported.

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