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Stephen Barr
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Cogeneration of Dark Matter and Baryons by Non-Standard-Model Sphalerons in Unified Models
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Sphalerons of a new gauge interaction can
convert a primordial asymmetry in $B$ or
$L$ into a dark matter asymmetry. From the
equilibrium conditions for the sphalerons
of both the electroweak and the new interactions,
one can compute the ratios of $B$, $L$, and
$X$, where $X$ is the dark matter number,
thus determining the mass of the dark matter
particle
fairly precisely. Such a scenario can arise
naturally in the context of unification with
larger groups. An illustrative model embeddable
in $SU(6) \times SU(2) \subset E_6$
is described in detail as well as an equally
simple model based on $SU(7)$.
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