Relativistic shock waves in viscous gluon matter

Abstract

We solve the relativistic Riemann problem in viscous gluon matter employing a microscopic parton cascade. We demonstrate the transition from ideal to viscous shock waves by varying the shear viscosity to entropy density ratio $\eta /s$ from zero to infinity. We show that an $\eta /s$ ratio larger than 0.2 prevents the development of well-defined shock waves on timescales typical for ultrarelativistic heavy-ion collisions. Comparisons with viscous hydrodynamic calculations confirm our findings.

Version as published in PRL 103, 032301 (2009). 4 pages, 4 figures

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