Electroweak Cogenesis

TL;DR

This paper introduces a renormalizable electroweak baryogenesis and asymmetric dark matter model using a two Higgs doublet setup with gauge singlets, linking dark matter stability and asymmetry generation during the electroweak phase transition.

Contribution

It presents a novel minimal model that generates baryon and dark matter asymmetries simultaneously without requiring light dark matter or new force carriers.

Findings

Dark matter mass can be relatively heavy due to model parameters.

The model predicts specific signatures for direct detection experiments.

Implications for collider searches are discussed.

Abstract

We propose a simple renormalizable model of baryogenesis and asymmetric dark matter generation at the electroweak phase transition. Our setup utilizes the two Higgs doublet model plus two complex gauge singlets, the lighter of which is stable dark matter. The dark matter is charged under a global symmetry that is broken in the early universe but restored during the electroweak phase transition. Because the ratio of baryon and dark matter asymmetries is controlled by model parameters, the dark matter need not be light. Thus, new force carriers are unnecessary and the symmetric dark matter abundance can be eliminated via Higgs portal interactions alone. Our model places a rough upper bound on the dark matter mass, and has implications for direct detection experiments and particle colliders.