http://arxiv.org/abs/1911.06788
We propose a novel mechanism to realize two-component asymmetric dark matter of very different mass scales through bound state formation and late freeze-in decay. Assuming a particle-antiparticle asymmetry is initially shared by SM baryons and two dark matter components, we demonstrate that the existence of bound states among the heavy DM particles is able to transfer most of the asymmetry stored in the heavy component to the light one by late decay. In this case, the energy densities of the two components can be comparable, and the correct relic density is reproduced.
M. Becker and W. Huang
Mon, 18 Nov 19
25/48
Comments: 15 pages plus appendices, 6 Figures
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