Abstract
In this paper, we calculate the relic abundance of the dark matter particles when they can annihilate into sterile neutrinos with the mass ≲ 100 GeV in a simple model. Unlike the usual standard calculations, the sterile neutrino may fall out of the thermal equilibrium with the thermal bath before the dark matter freezes out. In such a case, if the Yukawa coupling y N between the Higgs and the sterile neutrino is small, this process gives rise to a larger ΩDM h 2 so we need a larger coupling between the dark matter and the sterile neutrino for a correct relic abundance.
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Tang, YL., Zhu, Sh. Dark matter relic abundance and light sterile neutrinos. J. High Energ. Phys. 2017, 25 (2017). https://doi.org/10.1007/JHEP01(2017)025
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DOI: https://doi.org/10.1007/JHEP01(2017)025