Transport properties of the quark-gluon plasma from lattice QCD

TL;DR

This paper reviews recent progress in determining the transport properties of the quark-gluon plasma using lattice QCD, focusing on shear and bulk viscosity through correlator analysis.

Contribution

It introduces a new approach to extract transport coefficients from lattice QCD by analyzing specific correlators in the hydrodynamic regime.

Findings

Preliminary results on gluonic plasma between 0.95Tc and 4.0Tc.

Identification of promising correlator channels for viscosity extraction.

Insights into the temperature dependence of transport properties.

Abstract

I review the progress made in extracting transport properties of the quark-gluon plasma from lattice QCD simulations. The information on shear and bulk viscosity, the "low-energy constants" of hydrodynamics, is encoded in the retarded correlators of Tmunu, the energy-momentum tensor. Euclidean correlators, computable on the lattice, are related to the retarded correlators by an integral transform. The most promising strategy to extract shear and bulk viscosity is to study the shear and sound channel correlators where the hydrodynamic modes dominate. I present preliminary results from a comprehensive study of the gluonic plasma between 0.95Tc and 4.0Tc.