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arXiv · 2406.01415

Relic neutrino decay: a solution to the excess radio background

Rishav Roshan
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Abstract

The detection of excess radio background detected by ARCADE 2 suggests the presence of new physics as there exists no clear astrophysical solution. We find that the radiative decay of a relic neutrino into a sterile neutrino, assumed to be quasi-degenerate, provides a very good fit to ARCADE 2 data. The solution also predicts a stronger 21 cm absorption global signal than the predicted one from the $\Lambda$CDM model, with a contrast brightness temperature. The solution obtained is in mild tension with a much stronger signal claimed by the EDGES collaboration.

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Rishav Roshan. 2024-06-03. Relic neutrino decay: a solution to the excess radio background. https://arxiv.org/abs/2406.01415

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