Emissivity and conductivity of parton-hadron matter

TL;DR

This paper explores the properties of QCD matter during the deconfinement transition using the PHSD approach, focusing on electromagnetic radiation and conductivity in heavy-ion collisions.

Contribution

It provides new insights into photon and dilepton production and electric conductivity in QCD matter, combining equilibrium and out-of-equilibrium analyses.

Findings

Quantitative results on photon and dilepton yields

Determination of electric conductivity of QCD matter

Analysis of the sources contributing to direct photon elliptic flow

Abstract

We investigate the properties of the QCD matter across the deconfinement phase transition. In the scope of the parton-hadron string dynamics (PHSD) transport approach, we study the strongly interacting matter in equilibrium as well as the out-of equilibrium dynamics of relativistic heavy-ion collisions. We present here in particular the results on the electromagnetic radiation, i.e. photon and dilepton production, in relativistic heavy-ion collisions and the relevant correlator in equilibrium, i.e. the electric conductivity. By comparing our calculations for the heavy-ion collisions to the available data, we determine the relative importance of the various production sources and address the possible origin of the observed strong elliptic flow $v_2$ of direct photons.