Electroweak Cogenesis and a CP Violating Higgs Boson

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We propose a simple renormalizable
model of baryogenesis and asymmetric dark matter generation at the electroweak
phase transition. Our setup utilizes the two Higgs doublet model plus two
complex gauge singlets, the lighter of which is stable dark matter. The dark
matter is charged under a global symmetry that is broken in the early universe
but restored during the electroweak phase transition. Because the ratio of
baryon and dark matter asymmetries is controlled by model parameters, the dark
matter need not be light. Thus, new force carriers are unnecessary and the
symmetric dark matter abundance can be eliminated via Higgs portal interactions
alone. The dark matter mass is also constrained within a window around the weak
scale. One of the main predictions of this model is CP violating Higgs signals
at the LHC and future colliders.