Oscillation baryogenesis via ultraviolet dark matter freeze-in

We investigate baryogenesis from dark matter oscillations in the ultraviolet freeze-in regime. We find that the mechanism can simultaneously accommodate the observed abundances of baryons and dark matter for dark matter masses in the 10 keV to 2 MeV range, provided the reheat temperature lies between the temperature of the electroweak phase transition and <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"> <a:mo>∼</a:mo> <a:mn>10</a:mn> <a:mtext> </a:mtext> <a:mtext> </a:mtext> <a:mi>TeV</a:mi> </a:math> . The mechanism predicts observable consequences due to the presence of a light dark matter component that is relativistic during structure formation, and x-ray bounds on decaying dark matter can set strong constraints depending on the operator mediating dark matter production.