Nonminimal Lorentz-Violating Effects in Photon Physics

TL;DR

This paper explores how Lorentz-violating interactions in an extended QED model with an axion-like particle and a massive fermion lead to modifications in photon interactions and effective couplings, revealing new Lorentz-violating effects.

Contribution

It introduces a low energy effective action for a Lorentz-violating extended QED model with an axion-like particle and a massive fermion, highlighting novel Lorentz-violating effects.

Findings

Generated a correction to the axion-photon coupling.

Found Lorentz-violating effects in electromagnetic interaction energy.

Demonstrated effects on point charges, currents, and Dirac strings.

Abstract

We study an extension of QED involving a light pseudoscalar (an axion-like particle), together with a very massive fermion which has Lorentz-violating interactions with the photon and the pseudoscalar, including a nonminimal Lorentz-violating coupling. We investigate the low energy effective action for this model, after integration over the fermion field, and show that interesting results are obtained, such as the generation of a correction to the standard coupling between the axion-like particle and the photon, as well as Lorentz-violating effects in the interaction energy involving electromagnetic sources such as pointlike charges, steady line currents and Dirac strings.