Oscillation Baryogenesis via Ultraviolet Dark Matter Freeze-In

TL;DR

This paper explores a novel baryogenesis mechanism via dark matter oscillations in the ultraviolet freeze-in regime, capable of explaining baryon and dark matter abundances with specific mass and temperature conditions, and predicts observable consequences.

Contribution

It introduces a new baryogenesis scenario involving dark matter oscillations during ultraviolet freeze-in, with detailed conditions for matching observed abundances and potential observable signals.

Findings

Dark matter masses between 10 keV and MeV can produce observed baryon and dark matter densities.

The mechanism requires reheat temperatures between the electroweak scale and ~10 TeV.

Relativistic dark matter during structure formation leads to observable consequences and constraints.

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.