Dynamical screening in hot systems away from (chemical) equilibrium

TL;DR

This paper calculates photon emission and energy-loss rates in a quark-gluon plasma out of chemical equilibrium, demonstrating dynamic screening of singularities using HTL-resummed perturbation theory.

Contribution

It extends the HTL-resummed perturbation theory to analyze dynamical screening effects in non-equilibrium quark-gluon plasmas.

Findings

Mass singularities are dynamically screened out of equilibrium.

Pinch singularities are absent, ensuring well-defined results.

Provides a framework for studying non-equilibrium plasma properties.

Abstract

Within the Closed Time Path Formalism of Thermal Field Theory we calculate the hard photon emission rate as well as the collisional energy-loss rate for a quark-gluon plasma away from chemical equilibrium. Mass singularities are shown to be dynamically screened within HTL-resummed perturbation theory also away from equilibrium. Additional (pinch) singularities are absent and well defined results are obtained.