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Axion-photon-dark photon oscillation and its implication for 21 cm observation

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arxiv 1911.00532 v1 pith:DVCINO2W submitted 2019-11-01 hep-ph astro-ph.CO

Kiwoon Choi , Hyeonseok Seong , Seokhoon Yun This is my paper · ORCID
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keywords photonconversiondarkbackgroundfrequencygaugephotonsabove
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We examine the resonant conversion of axion-like particle (ALP) or dark photon to the electromagnetic photon in the early Universe, which takes place due to the ALP-photon-dark photon oscillations in background dark photon gauge fields. It is noted that the corresponding conversion probability can have an unusual spectral feature which allows strong conversion at low frequency domain, but has negligible conversion at high frequencies above certain critical frequency which is determined by the ALP coupling to dark photon and the strength of background dark photon gauge field. We apply this scheme to heat up the 21 cm photons without affecting the Cosmic Microwave Background, which can explain the tentative absorption signal of 21 cm photons detected recently by the EDGES experiment.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Excess Radiation from Axion-Photon Conversion

    astro-ph.CO 2024-11 conditional novelty 6.0 of 10

    Resonant conversion of axion-like particles into photons in stochastic magnetic fields can produce an f^-2 radio excess matching ARCADE-2 and deepen the 21cm absorption trough seen by EDGES.

  2. Probing the Axion-Photon-Dark Photon Interaction at Future $e^+e^-$ Colliders

    hep-ph 2025-09 conditional novelty 5.0 of 10

    Future e+e- colliders can probe the axion-photon-dark photon coupling down to about 10^-4 GeV^-1 for dark photon masses near 10 GeV via single-photon events with missing energy.

  3. 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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