Transport Properties of Strong-Interaction Matter

TL;DR

This paper investigates the shear viscosity to entropy ratio in hadronic matter at high temperatures, using kinetic theory and the Nambu-Jona-Lasinio model, focusing on chiral symmetry restoration effects.

Contribution

It provides new insights into the temperature dependence of shear viscosity in strong-interaction matter near chiral symmetry restoration.

Findings

Shear viscosity to entropy ratio decreases with increasing temperature.

Chiral symmetry restoration significantly affects transport properties.

Results are relevant for interpreting heavy-ion collision experiments.

Abstract

The properties of strong-interaction matter are probed in ultra-relativistic heavy-ion collisions. In the context of measurements of the elliptic flow at RHIC and the LHC the shear viscosity is of particular interest. In this presentation we discuss recent results for eta/s in hadronic matter at vanishing baryo-chemical potential within kinetic theory. Using the Nambu-Jona-Lasinio model, special attention is paid to effects arising from the restoration of spontaneously broken chiral symmetry with increasing temperature.