Abstract
We consider QCD near but above critical temperature T c . 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 T c . We refer to this region as a “semi”-QGP, where partial confinement plays important role. We show that the shear viscosity η is suppressed by two powers of the Polyakov loop. This suggests that η / T 3 decreases markedly as QCD cools down to temperatures near T c . We also show a ratio of the viscosity to the entropy becomes small near T c [Y. Hidaka and R.D. Pisarski, Phase," arXiv:0803.0453 [Phys. Rev. D (to be published)]].
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