An elementary stringy estimate of transport coefficients of large temperature QCD

TL;DR

This paper presents a simple holographic model to estimate transport coefficients of high-temperature QCD, providing explicit calculations of shear and bulk relaxation times through a minimal conformality-breaking deformation.

Contribution

It introduces a minimal five-dimensional holographic model that allows calculation of all second-order transport coefficients of large temperature QCD with a single parameter.

Findings

Explicit formulas for shear and bulk relaxation times.

All second-order transport coefficients derived from the model.

Model captures essential features of high-temperature QCD transport.

Abstract

Modeling QCD at large temperature with a simple holographic five dimensional theory encoding minimal breaking of conformality, allows for the calculation of all the transport coefficients, up to second order, in terms of a single parameter. In particular, the shear and bulk relaxation times are provided. The result follows by deforming the AdS background with a scalar dual to a marginally relevant operator, at leading order in the deformation parameter.