# Photon radiation in hot nuclear matter by means of chiral anomalies

## TL;DR

This paper proposes a novel photon emission mechanism in quark-gluon plasma driven by chiral anomalies, which does not need external magnetic fields and results in photon radiation comparable to traditional processes.

## Contribution

It introduces a new photon emission process based on chiral anomalies and calculates its rate, expanding understanding of photon production in hot nuclear matter.

## Key findings

- Photon dispersion relation acquires an imaginary mass in topological regions.
- Photon emission rate is comparable to conventional processes.
- Mechanism operates without external magnetic fields.

## Abstract

A new mechanism of photon emission in the quark-gluon plasma is proposed. Photon dispersion relation in the presence of the $CP$-odd topological regions generated by the chiral anomaly acquires an imaginary mass. It allows photon radiation through the decay $q\to q\gamma$ and annihilation $q\bar q\to \gamma$ processes closely related to the chiral Cherenkov radiation. Unlike previous proposals this mechanism does not require an external magnetic field. The differential photon emission rate per unit volume is computed and shown to be comparable to the rate of photon emission in conventional processes.