Severely Constraining Dark-Matter Interpretations of the 21-cm Anomaly
Severely Constraining Dark-Matter Interpretations of the 21-cm Anomaly
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 …