Thermodynamics and kinetics of Gribov-Zwanziger plasma with temperature dependent Gribov parameter

TL;DR

This paper models a gluon plasma using a Gribov-type dispersion relation with a temperature-dependent Gribov parameter, fitting lattice data and deriving viscosity coefficients, revealing enhanced bulk viscosity near the phase transition.

Contribution

It introduces a temperature-dependent Gribov parameter fitted to lattice data and derives non-equilibrium viscosity formulas ensuring thermodynamic consistency.

Findings

Enhanced bulk viscosity near the phase transition

Temperature-dependent Gribov parameter fitted to lattice results

Formulas for shear and bulk viscosity derived in non-equilibrium

Abstract

A Gribov-type dispersion relation is treated as an effective description of interacting gluons forming a hot medium. Temperature dependence of the Gribov parameter is determined from the fit to the lattice Yang-Mills results describing thermodynamic functions. To maintain thermodynamic consistency of the approach, a temperature dependent bag pressure is introduced. The results obtained for equilibrium functions are generalised in the next step to non-equilibrium conditions. We derive formulas for the bulk and shear viscosity coefficients within the relaxation time approximation. We find evidence for largely enhanced bulk viscosity in the region of the phase transition.