Quark-Gluon Plasmas and Thermalization

TL;DR

This paper provides a pedagogical overview of the theory of quark-gluon plasma thermalization, covering equilibrium formalism, screening, confinement, plasma phenomena, and thermalization processes relevant at high energies.

Contribution

It offers a comprehensive qualitative introduction to quark-gluon plasma thermalization within the small alpha_s limit, integrating various phenomena and theoretical frameworks.

Findings

Discussion of Debye screening and electric deconfinement

Analysis of plasma waves and hydrodynamic properties

Insights into thermalization mechanisms in heavy ion collisions

Abstract

In these lectures, I will attempt a pedagogical and qualitative introduction to the theory of equilibrium and thermalization of quark-gluon plasmas. I assume only that the reader is familiar with quantum field theory at zero temperature and with QCD as the theory of the strong interactions. I focus on the limit of small alpha_s, which in principle should be relevant at extremely high temperature because of asymptotic freedom, and in any case provides a clean theoretical context in which to discuss a variety of phenomena. Topics discussed include the basic equilibrium formalism for finite-temperature quantum field theory, Debye screening, electric deconfinement, magnetic confinement, dimensional reduction, plasma waves, kinetic theory, hydrodynamic properties such as viscosity, the Landau-Pomeranchuk-Migdal effect, thermalization in (arbitrarily high energy) heavy ion collisions, and QCD plasma instabilities.