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Physics Letters B 709 (2012) 77-81
Ratio of bulk to shear viscosity in a quasigluon plasma: from weak to strong coupling
M. Bluhm1, B. Kampfer, K. Redlich

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.
1:  SUBATECH - Laboratoire SUBATECH Nantes
Physics/High Energy Physics - Phenomenology

Physics/High Energy Physics - Theory

Physics/Nuclear Theory
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