Suppression of the shear viscosity near the critical temperature in hot QCD

Details Suppression of the shear viscosity near the critical temperature in hot QCD Suppression of the shear viscosity near the critical temperature in hot QCD

2008-11-07

arxiv.org/abs/0811.1202v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 2 figures, talk given at SEWM 2008, August 26-29, Amsterdam

Scientific paper

10.1016/j.nuclphysa.2009.01.023

We consider QCD near but above critical temperature Tc. The pressure, susceptibilities and the renormalized Polyakov loop -- which is an order parameter for the deconfining phase transition -- dramatically change up to temperatures a few times Tc. We refer to this region as a "semi"-QGP, where partial confinement plays important role. We show that the shear viscosity ,eta, is suppressed by two powers of the Polyakov loop. This suggests that eta/T^3 decreases markedly as QCD cools down to temperatures near Tc. We also show a ratio of the viscosity to the entropy becomes small near Tc.

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