The impact of EDGES 21-cm data on dark matter interactions
Cosmology and Nongalactic Astrophysics
2018-12-19 v3 High Energy Astrophysical Phenomena
High Energy Physics - Phenomenology
Abstract
The recently announced results on the 21-cm absorption spectrum by the EDGES experiment can place very stringent limits on dark matter annihilation cross-sections. We properly take into account the heating energy released from dark matter annihilation from the radiation epoch to the 21-cm observation redshifts in the radiative transfer to compute the evolution of the gas temperature. Our results show that the global 21-cm absorption profile is a powerful cosmological probe of the dark matter interactions. For dark matter annihilating into electron-positron pairs, the EDGES results give a more stringent upper limit than the PLANCK result on the annihilation cross section at the lower dark matter mass region.
Keywords
Cite
@article{arxiv.1803.09398,
title = {The impact of EDGES 21-cm data on dark matter interactions},
author = {Kingman Cheung and Jui-Lin Kuo and Kin-Wang Ng and Yue-Lin Sming Tsai},
journal= {arXiv preprint arXiv:1803.09398},
year = {2018}
}
Comments
v3, accepted version