Quadratic Coupling of the Axion to Photons
High Energy Physics - Phenomenology
2023-07-21 v1
Abstract
We show that the QCD axion couples to the electromagnetic kinetic term at one loop. The result is that if axions make up dark matter, they induce temporal variation of the fine structure constant , which is severely constrained. We recast these constraints on the QCD axion parameter space. We also discuss how to generalise our finding to axion-like particles, and the resulting constraints.
Keywords
Cite
@article{arxiv.2307.10362,
title = {Quadratic Coupling of the Axion to Photons},
author = {Carl Beadle and Sebastian A. R. Ellis and Jérémie Quevillon and Pham Ngoc Hoa Vuong},
journal= {arXiv preprint arXiv:2307.10362},
year = {2023}
}
Comments
5 pages, 2 figures, 6 page appendix