Title of Paper:Shear viscosity in the Nambu–Jona-Lasinio model with Φ-derivable approximations

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Date of Publication:2013-08-23

Journal:Phys.Rev. D

Discipline:Natural Science

First-Level Discipline:Physics

Volume:88

Issue:3

Page Number:036012

Abstract:Within the Nambu–Jona-Lasinio model the temperature dependence of the shear viscosity is calculated to the first nontrivial order in the 1/Nc expansion with Φ-derivable approximations. The two-particle irreducible effective action is computed to next-to-leading order, from which the integral equations for the 3- and 4-point vertices are obtained. These sum infinite sets of diagrams contributing to the shear viscosity at the same order in the 1/Nc expansion. We find that the shear viscosity decreases rapidly when the chiral crossover is approached. Comparing with the hadron phase, the quark-glu