Photon production from non-equilibrium disoriented chiral condensates in a longitudinal expansion : A theoretic framework

TL;DR

This paper develops a theoretical framework for photon production during the non-equilibrium relaxation of disoriented chiral condensates in an expanding spacetime, relevant for heavy-ion collision experiments.

Contribution

It introduces a novel theoretical approach to quantize photons in an expanding spacetime to study their production from disoriented chiral condensates.

Findings

Framework enables calculation of photon yields in expanding backgrounds.

Photon signatures could indicate disoriented chiral condensate formation.

Provides a basis for analyzing direct photon measurements in heavy-ion collisions.

Abstract

A theoretical framework is developed for treating the quantization of the photons in a spacetime with a longitudinal expansion. This can be used to study the production of the photons through the non-equilibrium relaxation of a disoriented chiral condensate presumably formed in the expanding hot central region in ultra-relativistic heavy-ion collisions. These photons can be a signature of the formation of disoriented chiral condensates in the direct photon measurements of heavy-ion collisions.