Electroweak Baryogenesis and Dark Matter via a Pseudoscalar

We show that a dark matter model consisting of a Dirac fermion and a pseudoscalar mediator is capable of explaining the electroweak baryogenesis. In this line it is discussed that the electroweak phase transition turns to be first order after taking into account the role of the pseudoscalar in the thermal effective potential. The allowed dark matter mass that leads to correct dark matter relic abundance and render the electroweak phase transition first order, sits in the range $60-320$ GeV. The model also evades easily the bounds from the direct detection experiments.

Comments: 10 pages, 1 figure

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