Effective Transport Equations for non-Abelian Plasmas

TL;DR

This paper derives covariant transport equations for non-Abelian plasmas, incorporating fluctuations and noise, with applications to near-equilibrium hot plasmas, providing a classical framework with quantum generalizations.

Contribution

It introduces a systematic method to derive effective transport equations including fluctuations and noise for non-Abelian plasmas, extending classical transport theory.

Findings

Derived covariant transport equations for non-Abelian plasmas.

Obtained collision integrals as correlators of fluctuations.

Identified stochastic noise sources and formulated Boltzmann-Langevin equations.

Abstract

Starting from classical transport theory, we derive a set of covariant equations describing the dynamics of mean fields and their statistical fluctuations in a non-Abelian plasma in or out of equilibrium. A general procedure is detailed for integrating-out the fluctuations as to obtain the effective transport equations for the mean fields. In this manner, collision integrals for Boltzmann equations are obtained as correlators of fluctuations. The formalism is applied to a hot non-Abelian plasma close to equilibrium. We integrate-out explicitly the fluctuations with typical momenta of the Debye mass, and obtain the collision integral in a leading logarithmic approximation. We also identify a source for stochastic noise. The resulting dynamical equations are of the Boltzmann-Langevin type. While our approach is based on classical physics, we also give the necessary generalizations to study the quantum plasmas. Ultimately, the dynamical equations for soft and ultra-soft fields change only in the value for the Debye mass.