Chiral symmetry and mesons in hot and dense matter: recent developments

TL;DR

This paper reviews recent advances in understanding meson properties in hot and dense matter using chiral Lagrangians, focusing on chiral symmetry restoration, meson pole evolution, and transport phenomena relevant for nuclear physics experiments.

Contribution

It provides a comprehensive update on meson behavior at high temperature and density, emphasizing the connection with chiral symmetry restoration and nonequilibrium effects.

Findings

Temperature and density influence meson pole positions.

Chiral symmetry restoration affects meson properties.

Transport coefficients are characterized in nonequilibrium phases.

Abstract

We review recent results on properties of the meson gas relevant for Heavy Ion Collision and Nuclear Matter experiments, within the framework of chiral lagrangians. In particular, we describe the temperature and density evolution of the $\sigma$ and $\rho$ poles and its connection with chiral symmetry restoration, as well as the chemical nonequilibrated phase and transport coefficients.