Gravitational wave and collider signals in complex two-Higgs doublet model with dynamical CP-violation at finite temperature

TL;DR

This paper explores how a complex two-Higgs doublet model with dynamical CP-violation at finite temperature can produce observable gravitational wave signals and collider signatures, aiding understanding of electroweak baryogenesis.

Contribution

It provides a detailed analysis of phase transition dynamics and gravitational wave signals in this model, highlighting their potential to complement collider experiments.

Findings

Multiple phase transition patterns, including multi-step and supercooling, can occur.

Gravitational wave signals can help distinguish different phase transition scenarios.

Collider signals at future lepton colliders can complement gravitational wave observations.

Abstract

Extra CP-violating source for electroweak baryogenesis can dynamically appear at finite temperature in the complex two-Higgs doublet model, which might help to alleviate the strong constraints from the electric dipole moment experiments. In this scenario, we study the detailed phase transition dynamics and the corresponding gravitational wave signals in synergy with the collider signals at future lepton colliders. For some parameter spaces, various phase transition patterns can occur, such as the multi-step phase transition and supercooling. Gravitational waves complementary to collider signals can help to pin down the underlying phase transition dynamics or different phase transition patterns.