A global study of the extended scalar singlet model

TL;DR

This study explores an extended scalar singlet model with fermionic dark matter, combining cosmological, collider, and gravitational wave data to identify viable scenarios that explain dark matter and baryogenesis.

Contribution

It provides a comprehensive global analysis of the extended scalar singlet model, integrating multiple experimental constraints and highlighting potential gravitational wave signals.

Findings

Model can explain dark matter abundance and baryogenesis simultaneously.

Viable parameter space predicts strong gravitational wave signals.

Constraints from collider and direct detection experiments are compatible with the model.

Abstract

We present preliminary results from a global study of the extended scalar singlet model with a fermionic dark matter (DM) candidate. In addition to requiring a successful electroweak baryogenesis, we combine constraints from the DM relic density, direct detection limits from PandaX-II experiment, electroweak precision observables and Higgs searches at colliders. In agreement with previous studies, we find that the model can simultaneously explain (at least a part of) the observed DM abundance and matter-antimatter asymmetry. The viable points often lead to strong gravitational wave (GW) signals that can potentially be probed at future GW experiments.