Extension of the electrodynamics in the presence of the axion and dark photon

TL;DR

This paper develops an extended electrodynamics framework incorporating axions and dark photons, deriving modified Maxwell's equations and exploring implications for particle conversions and cosmological anomalies.

Contribution

It introduces a comprehensive extension of electrodynamics with axions and dark photons, including wave equations and implications for astrophysical phenomena.

Findings

Derived extended Maxwell's equations with axions and dark photons

Analyzed enhanced particle conversion effects in magnetic fields

Discussed implications for the 21cm spectrum anomaly

Abstract

We present the extended electrodynamics in the presence of the axion and dark photon. We derive the extended versions of Maxwell's equations and dark Maxwell's equations (for both massive and massless dark photons) as well as the wave equations. We discuss the implications of this extended electrodynamics including the enhanced effects in the particle conversions under the external magnetic or dark magnetic field. We also discuss the recently reported anomaly in the redshifted 21cm spectrum using the extended electrodynamics.