A thermodynamic approach to the relaxation of viscosity and thermal conductivity

TL;DR

This paper introduces a higher order thermodynamic theory for the relaxation of heat and viscosity, applying it to the Quark Gluon Plasma and analyzing various cooling and re-heating scenarios.

Contribution

It presents a novel higher order relaxation theory based on corrections to relativistic energy density, applicable to accelerating longitudinal flows.

Findings

Energy flux can be zero in stationary cases regardless of the rest frame.

The theory effectively models cooling and re-heating scenarios for QGP.

Comparison of different flow scenarios demonstrates the model's versatility.

Abstract

A novel higher order theory of relaxation of heat and viscosity is proposed based on corrections to the traditional treatment of the relativistic energy density. In the framework of generalized Bjorken scaling solution to accelerating longitudinal flow we point out that the energy flux can be consequently set to zero in the stationary case, independently of the choice of a specific local rest frame, like the Landau-Lifshitz or Eckart one. We investigate and compare several cooling and re-heating scenarios for the Quark Gluon Plasma (QGP) within this approach.