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Impact of helical electromagnetic fields on the axion window

Kobayashi, T and Jain, RK (2021) Impact of helical electromagnetic fields on the axion window. In: Journal of Cosmology and Astroparticle Physics, 2021 (3).

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Official URL: https://doi.org/10.1088/1475-7516/2021/03/025


Primordial electromagnetic fields can strongly affect the cosmic evolution of axions, and vice versa. We show that if helical electromagnetic fields are coherently produced in the early universe, their remnants source a field velocity to the coupled axions and enhance the relic abundance of axion dark matter. We discuss the implications for the QCD axion and axion-like particles that are coupled to the SM or hidden gauge groups. For a QCD axion coupled to hidden photons, we find that the conventional window for the axion decay constant 108 GeV ≲ f ≲ 1012 GeV can be completely closed due to overproduction of axion dark matter by helical electromagnetic fields as little as αΔNeff ≳ 10-12, where α is the gauge coupling and αNeff is the effective extra relativistic degrees of freedom of the hidden photons. © 2021 IOP Publishing Ltd and Sissa Medialab.

Item Type: Journal Article
Publication: Journal of Cosmology and Astroparticle Physics
Publisher: IOP Publishing Ltd
Additional Information: The copyright for this article belongs to the Authors.
Keywords: Axions; Dark matter theory; Particle physics - cosmology connection; Primordial magnetic fields
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 06 Jun 2023 09:34
Last Modified: 06 Jun 2023 09:34
URI: https://eprints.iisc.ac.in/id/eprint/81800

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