Constraining Baryon--Dark Matter Scattering with the Cosmic Dawn 21-cm Signal

28 Feb 2018 Fialkov Anastasia Harvard Barkana Rennan Tel Aviv University Cohen Aviad Tel Aviv University

The recent detection of an anomalously strong 21-cm signal of neutral hydrogen from Cosmic Dawn by the EDGES Low-Band radio experiment can be explained if cold dark matter particles scattered off the baryons draining excess energy from the gas. In this Letter we explore the expanded range of the 21-cm signal that is opened up by this interaction, varying the astrophysical parameters as well as the properties of dark matter particles in the widest possible range... (read more)

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