Wednesday, January 11, 2012

1112.2704 (Yanou Cui et al.)

A WIMPy Baryogenesis Miracle    [PDF]

Yanou Cui, Lisa Randall, Brian Shuve
Generally, baryogenesis and the establishment of the dark matter density are treated as independent processes. Recent work on asymmetric dark matter shows that connections between the dark and visible sectors might account for the similarity in the energy densities of baryonic and dark matter. In this paper, we explore a very different possible connection, in which weakly interacting massive particle (WIMP) dark matter annihilation is also directly responsible for baryogenesis. We call this process "WIMPy baryogenesis". The dark matter relic density in these models, as with conventional WIMP models, is obtained with only order one couplings and TeV-scale masses according to the WIMP miracle. Thus, WIMPy baryogenesis models naturally accommodate weak-scale dark matter, in contrast with many asymmetric dark matter models. Furthermore, in WIMPy baryogenesis the observed baryon asymmetry is simultaneously obtained together with the correct dark matter abundance, which is the "miracle" of WIMPy baryogenesis. The models we present have the further feature that they create the baryon number asymmetry at the weak scale, thereby avoiding the problems in some models of baryogenesis associated with high reheat temperatures in supersymmetric theories. Some of these models yield observable consequences in ongoing and future experiments.
View original: http://arxiv.org/abs/1112.2704

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