Electromagnetic spectral functions in hot and dense chirally imbalanced quark matter

TL;DR

This paper investigates the electromagnetic spectral functions in hot, dense quark matter with chiral imbalance, revealing how chiral chemical potential influences the spectral properties and physical processes at finite temperature and density.

Contribution

It provides a detailed analysis of the photon self-energy and spectral functions in chirally imbalanced quark matter using thermal field theory and the NJL model, highlighting new effects of chiral chemical potential.

Findings

Chiral chemical potential affects the electromagnetic spectral function spectrum.

Chiral condensate behavior varies with temperature in the presence of chiral imbalance.

A continuous electromagnetic spectral function spectrum is observed due to chiral chemical potential.

Abstract

The photon self-energy from chirally imbalanced quark matter is evaluated at finite temperature and density using the real time formulation of thermal field theory. The analytic structure is explored in detail exposing the cut structure which corresponds to a variety of physical scattering and decay processes in the medium and their thresholds. The mass of the quarks in the chiral symmetry broken phase are obtained from the gap equation of the Nambu--Jona-Lasinio model. It is found that, in presence of finite chiral chemical potential, the chiral condensate tends to get stronger at low temperature while the opposite is observed at high values of temperature. A continuous spectrum is obtained for the electromagnetic spectral function and this is purely a finite chiral chemical potential effect.