ALP anarchy

Chadha-Day, Francesca; Maxwell, James; Turner, Jessica

Abstract

String theory models generically predict the existence of multiple axion-like particle (ALP) fields, yet the majority of both theoretical and experimental works have assumed only one ALP. In this paper, we discuss the phenomenology of systems with multiple ALPs that can undergo oscillations akin to neutrino oscillations. Motivated by this effect, we extend the `anarchy' framework, which has been used to predict neutrino oscillation parameters, to generate the parameters of many ALP systems. We explore the phenomenology of these ALP anarchy models in some of the leading ALP search strategies, including the CERN Axion Solar Telescope, magnetic white dwarfs and the gamma-ray spectra of distant blazars. We include both the ALP-photon and the ALP-electron coupling. We find that ALP anarchy models predict drastically different results than single ALP models.

Citation

Chadha-Day, F., Maxwell, J., & Turner, J. (2024). ALP anarchy. Journal of Cosmology and Astroparticle Physics, 2024(09), https://doi.org/10.1088/1475-7516/2024/09/056

• Journal Article Type: Article
• Acceptance Date: Aug 22, 2024
• Online Publication Date: Sep 25, 2024
• Publication Date: Sep 1, 2024
• Deposit Date: Oct 8, 2024
• Publicly Available Date: Oct 8, 2024
• Journal: Journal of Cosmology and Astroparticle Physics
• Electronic ISSN: 1475-7516
• Publisher: IOP Publishing
• Peer Reviewed: Peer Reviewed
• Volume: 2024
• Issue: 09
• DOI: https://doi.org/10.1088/1475-7516/2024/09/056
• Keywords: absorption and radiation processes, string theory and cosmology, active galactic nuclei, axions
• Public URL: https://durham-repository.worktribe.com/output/2893024