Thermal quench of a dynamical QCD model in an external electric field

TL;DR

This paper explores how an external electric field affects the thermal and electrical dynamics of a holographic QCD model, revealing insights into out-of-equilibrium behavior in strongly interacting systems.

Contribution

It introduces a detailed analysis of electric field effects on a holographic QCD model, including instability, current relaxation, and equilibration times, under various conditions.

Findings

Electric field induces instability in the model.

Relaxation times depend on temperature, electric field strength, and chemical potential.

Results align with other holographic models and experimental data.

Abstract

In this article, we investigate the thermal equilibration of the holographic QCD model dual to the Einstein-Maxwell-Dilaton (EMD) gravity in the presence of an external electric field. The model captures the QCD features at finite temperature and finite chemical potential in both confinement and deconfinement phases and could be considered a good candidate to study the dynamics of the strongly interacting system in out-of-equilibrium conditions. For this purpose, we examine the instability imposed by an external electric field using the AdS/CFT dictionary and study the electric current flow and its relaxation for this holographic model. We study the effects of temperature, electric field strength, and chemical potential on the current flow of the stationary state by applying a constant electric field. Additionally, for a time-dependent electric field, we investigate the relaxation time scales of the system using equilibration time. Finally, we compare our results with those from other holographic models and experiments.