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Cosmological constraints on axionic dark radiation from axion-photon conversion in the early Universe

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arxiv 1306.6518 v2 pith:CG7WR6ES submitted 2013-06-27 hep-ph astro-ph.COhep-th

Tetsutaro Higaki , Kazunori Nakayama , Fuminobu Takahashi This is my paper · ORCID
classification hep-phastro-ph.COhep-th
keywords axion-photondarkradiationaxionicconstraintsconversioncosmologicalmagnetic
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Axions seem ubiquitous in string theories and some of them may be produced non-thermally by heavy scalar decays, contributing to dark radiation. We study various cosmological effects of photons produced from the axionic dark radiation through axion-photon conversion in the presence of primordial magnetic fields, and derive tight constraints on the combination of the axion-photon coupling and the primordial magnetic field.

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  1. Axion-Photon Conversion in FLRW with Primordial Magnetic Fields: Explaining the Radio Excess

    astro-ph.CO 2025-09 conditional novelty 4.0 of 10

    Resonant conversion of axion-like particles into photons in nanogauss primordial magnetic fields is claimed to explain both the ARCADE2 radio excess and the EDGES 21-cm trough for axion masses near 10^-14 to 10^-12 eV.

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