Dark Sector Electroweak Baryogenesis In Light Of The Galactic Center Excess

TL;DR

This paper explores a dark sector electroweak baryogenesis model that simultaneously explains the baryon asymmetry, dark matter relic density, and the galactic center gamma-ray excess, while predicting observable gravitational waves and dark matter signals.

Contribution

It introduces a novel dark sector model that sequesters CP violation, linking baryogenesis, dark matter, and gamma-ray excesses with testable predictions.

Findings

The model can produce the observed baryon asymmetry.

It accounts for the gamma-ray excess from the galactic center.

Predicted gravitational waves from the electroweak phase transition.

Abstract

We revisit a model of electroweak baryogenesis that includes a dark matter candidate, and sequesters the new CP violation required to produce the baryon asymmetry in a dark sector. The model can explain the baryon asymmetry, dark matter relic density, and the long-standing excess of gamma rays from the galactic center. The first order electroweak phase transition induced by the new physics can give rise to gravitational waves that may be observed in future experiments. The model predicts dark matter signals in direct detectors, and a significant contribution to the Higgs boson invisible decay width.