Ratio of bulk to shear viscosity in a quasigluon plasma: from weak to strong coupling

Details Ratio of bulk to shear viscosity in a quasigluon plasma: from weak to strong coupling Ratio of bulk to shear viscosity in a quasigluon plasma: from weak to strong coupling

2011-01-16

arxiv.org/abs/1101.3072v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

Jan 2011. 11pp

Scientific paper

The ratio of bulk to shear viscosity is expected to exhibit a different behaviour in weakly and in strongly coupled systems. This can be expressed by the dependence of the ratio on the squared sound velocity. In the high temperature QCD plasma at small running coupling, the viscosity ratio is uniquely determined by a quadratic dependence on the conformality measure, whereas in certain strongly coupled and nearly conformal theories this dependence is linear. Employing an effective kinetic theory of quasiparticle excitations with medium-modified dispersion relation, we analyze the ratio of bulk to shear viscosity of the gluon plasma. We show that in this approach the viscosity ratio comprises both dependencies found by means of weak coupling perturbative and strong coupling holographic techniques.

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