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Axion-Photon Conversion and Effects on 21cm Observation
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Axion-Photon Conversion and Effects on 21cm Observation
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Recently the EDGES experiment reported an enhanced 21cm absorption signal in the radio wave observation, which may be interpreted as either anomalous cooling of baryons or heating of cosmic microwave background photons. In this paper, we pursue the latter possibility. We point out that dark radiation consisting of axion-like particles can resonantly convert into photons under the intergalactic magnetic field, which can effectively heat up the radiation in the frequency range relevant for the EDGES experiment. This may explain the EDGES anomaly.
Forward citations
Cited by 1 Pith paper
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Axion-Photon Conversion in FLRW with Primordial Magnetic Fields: Explaining the Radio Excess
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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