Axion Decay in a Constant Electromagnetic Background Field and at Finite Temperature using World-line Methods

TL;DR

This paper studies axion decay into two photons within a constant electromagnetic background at finite temperature, employing world-line methods to incorporate external fields to all orders and exploring potential generalizations to thermal conditions.

Contribution

It introduces a world-line formalism approach to calculate axion decay in external fields and discusses extending this method to finite temperature scenarios.

Findings

Effective one-loop calculation of axion decay in external fields.

Framework for generalizing to finite temperature environments.

Potential for more accurate modeling of axion-photon interactions.

Abstract

We investigate the radiative decay of the axion into two photons in an external electromagnetic field to one loop order. Our approach is based on the world-line formalism, which is very suitable to take into account the external field to all orders. Afterwards we discuss how the calculation could be generalized to finite temperature.