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Bounds on Dark Matter decay from 21 cm line
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The observation of the cosmic 21-cm spectrum can serve as a probe for Dark Matter properties. We point out that the knowledge of the signal amplitude at a given redshift allows one to put conservative bounds on the DM decay rate which are independent of astrophysical parameters. These limits are valid for the vast majority of DM models, those without extra IGM cooling or additional background radiation. Using the experimental results reported by the EDGES collaboration, we derive bounds that are stronger than the ones derived from other CMB observations and competitive with the ones from indirect detection.
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Cited by 2 Pith papers
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Reviving Millicharged Dark Matter for 21-cm Cosmology
Adding a long-range interaction between a millicharged dark matter subcomponent and the dominant cold dark matter lets the dark sector act as a heat sink, reviving the millicharged explanation of the EDGES 21-cm anomaly.
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Cosmological constraints on TeV-scale dark matter subcomponents decaying between recombination and reionisation
Future global 21-cm observations could beat CMB limits on TeV-scale decaying dark matter for lifetimes ≳10^15 s, especially for decays into neutrinos.
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