# Baryogenesis via Dark Matter-Induced Symmetry Breaking in the Early Universe

## TL;DR

This paper proposes a novel mechanism for baryogenesis where dark matter density fluctuations induce symmetry breaking and subsequent scalar field oscillations, generating the universe's matter-antimatter asymmetry.

## Contribution

It introduces a new baryogenesis model utilizing dark matter-induced symmetry breaking and scalar field dynamics, distinct from existing theories.

## Key findings

- Dark matter density triggers spontaneous U(1) symmetry breaking.
- Scalar field oscillations lead to baryon asymmetry generation.
- The mechanism can produce the observed matter-antimatter imbalance.

## Abstract

We put forward a new proposal for generating the baryon asymmetry of the universe by making use of the dynamics of a $\mathrm{U}(1)$ scalar field coupled to dark matter. High dark matter densities cause the $\mathrm{U}(1)$ symmetry to break spontaneously so that the field acquires a large vacuum expectation value. The symmetry is restored when the density redshifts below a critical value, resulting in the coherent oscillation of the scalar field. A net $B-L$ number can be generated either via baryon number-conserving couplings to the standard model or through small symmetry-violating operators and the subsequent decay of the scalar condensate.