Dissipative phenomena in chemically non-equilibrated quark gluon plasma

TL;DR

This paper derives dissipative corrections to hydrodynamics in a chemically non-equilibrated quark-gluon plasma, showing how viscosity affects temperature and fugacity evolution during expansion.

Contribution

It introduces a simple method to incorporate dissipation into hydrodynamic equations and extends it to study chemical equilibration with rate equations in viscous plasma.

Findings

Viscous effects slow down temperature decrease.

Fugacities of quarks and gluons evolve faster with dissipation.

Dissipation significantly impacts plasma evolution dynamics.

Abstract

The dissipative corrections to the hydrodynamic equations describing the evolution of energy-momentum tensor and parton densities are derived in a simple way using the scaling approximation for the expanding quark gluon plasma at finite baryon density. This procedure has been extended to study the process of chemical equilibration using a set of rate equations appropriate for a viscous quark gluon plasma. It is found that in the presence of dissipation, the temperature of the plasma evolves slower, whereas the quark and gluon fugacities evolve faster than their counterparts in the ideal case without viscosity.