Bounds on Dark Matter decay from 21 cm line
摘要
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.
引用
@article{arxiv.1803.11169,
title = {Bounds on Dark Matter decay from 21 cm line},
author = {Andrea Mitridate and Alessandro Podo},
journal= {arXiv preprint arXiv:1803.11169},
year = {2018}
}
备注
9 pages, 2 figures. v3: Improved discussion of the assumptions, matching to the published version. Bounds for different decay channels included. References added