Oscillation Baryogenesis via Ultraviolet Dark Matter Freeze-In

Abstract

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 MeV range, provided the reheat temperature lies between the temperature of the electroweak phase transition and ~10 TeV. 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.

27 pages, 8 figures, 1 table. V2: added discussion of astrophysical constraints on heavier DM decay to lighter DM plus photon; typos corrected, other minor changes to improve clarity. Version published in PRD

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