Bulk viscosity of hot dense Quark matter in PNJL model

TL;DR

This paper investigates the bulk viscosity of hot dense quark matter using the PNJL model, revealing a sharp peak near the chiral phase transition and a significant increase with chemical potential, aligning with lattice results.

Contribution

It provides a detailed analysis of bulk viscosity behavior in the PNJL model near the chiral phase transition, incorporating effects of chemical potential.

Findings

Bulk viscosity peaks sharply near the chiral transition.

Bulk viscosity over entropy ratio increases dramatically near the phase transition.

Higher chemical potential leads to increased bulk viscosity.

Abstract

Starting from the Kubo formula and the the QCD low energy theorem, we study the the bulk viscosity of hot dense quark matter in the PNJL model from the equation of state . We show that the bulk viscosity has a sharp peak near the chiral phase transition, and the ratio of bulk viscosity over entropy rises dramatically in the vicinity of the phase transition. These results agrees with that from lattice and other model calculations. In addition, we show that the increase of chemical potential raises the bulk viscosity.