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.

Bounds on Dark Matter decay from 21 cm line

Mitridate, Andrea;Podo, Alessandro
2018

Abstract

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.
2018
dark matter theory; intergalactic media; particle physics-cosmology connection; reionization; High Energy Physics - Phenomenology; High Energy Physics - Phenomenology; astro-ph.CO; Astronomy and Astrophysics
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11384/78894
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