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Oscillation baryogenesis via ultraviolet dark matter freeze-in

Tian Dong1,2, Conor M. Floyd1, Antonia Hekster1, Derek J. Li1,3, Brian Shuve1, and David Tucker-Smith4

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Phys. Rev. D 112, 115031 – Published 18 December, 2025

DOI: https://doi.org/10.1103/8jth-q9kc

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 2 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.

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Phys. Rev. D 112, 115031– Published 18 December, 2025
  • Received 10 August 2025
  • Accepted 20 November 2025
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