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2018

Severely Constraining Dark Matter Interpretations of the 21-cm Anomaly

Berlin, Asher, Hooper, Dan, Krnjaic, Gordan et al.

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The EDGES Collaboration has recently reported the detection of a stronger-than-expected absorption feature in the global 21-cm spectrum, centered at a frequency corresponding to a redshift of z ~ 17.

This observation has been interpreted as evidence that the gas was cooled during this era as a result of scattering with dark matter.
In this study, we explore this possibility, applying constraints from the cosmic microwave background, light element abundances, Supernova 1987A, and a variety of laboratory experiments.
After taking these constraints into account, we find that the vast majority of the parameter space capable of generating the observed 21-cm signal is ruled out.

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