# Is electroweak baryogenesis dead?

## TL;DR

This paper proposes a new model for electroweak baryogenesis that avoids fine tuning, introduces a novel CP violation source via a singlet scalar, and links dark matter to baryon asymmetry, overcoming previous limitations.

## Contribution

It introduces a UV-complete electroweak baryogenesis model with dark matter-driven CP violation, eliminating the need for fine tuning and high-scale inconsistencies.

## Key findings

- A model with a singlet scalar induces a strong first order phase transition.
- Dark matter provides the CP asymmetry source for baryogenesis.
- The model operates successfully above 1 TeV without fine tuning.

## Abstract

Electroweak baryogenesis is severely challenged in its traditional settings: the Minimal Supersymmetric Standard Model, and in more general two Higgs doublet models. Fine tuning of parameters is required, or large couplings leading to a Landau pole at scales just above the new physics introduced. The situation is somewhat better in models with a singlet scalar coupling to the Higgs so as to give a strongly first order phase transition due to a tree-level barrier, but even in this case no UV complete models had been demonstrated to give successful baryogenesis. Here we point out some directions that overcome this limitation, by introducing a new source of CP violation in the couplings of the singlet field. A model of electroweak baryogenesis requiring no fine tuning and consistent to scales far above 1 TeV is demonstrated, in which dark matter plays the leading role in creating a CP asymmetry that is the source of the baryon asymmetry.