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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