Electromagnetic conductivity of quark-gluon plasma at non-zero baryon density

TL;DR

This study uses lattice simulations to analyze how electromagnetic conductivity in dense quark-gluon plasma varies with baryon density, revealing a significant increase as density rises.

Contribution

First lattice simulation study of electromagnetic conductivity in dense quark-gluon plasma at physical quark masses and non-zero baryon density.

Findings

Electromagnetic conductivity increases with baryon density.

Strong dependence of conductivity on baryon chemical potential.

Use of Tikhonov regularisation to extract conductivity from correlators.

Abstract

In this preprint we present our results on the study of the electromagnetic conductivity in dense quark-gluon plasma obtained within lattice simulations with $N_f = 2 + 1$ dynamical quarks. We employ stout improved rooted staggered quarks at the physical point and the tree-level Symanzik improved gauge action. The simulations are performed at imaginary baryon chemical potential, and the Tikhonov regularisation method is used to extract the conductivity from current-current correlators. Our results indicate an increase of QGP electromagnetic conductivity with real baryon density, and this dependence is quite strong.