Impact of a complex singlet: From dark matter to baryogenesis

TL;DR

This paper explores how a complex singlet and CP-violating operators can simultaneously explain dark matter abundance and baryon asymmetry, analyzing electroweak phase transitions and their implications.

Contribution

It systematically studies electroweak baryogenesis with a complex singlet, revealing the conditions for strong first order phase transitions and their impact on baryon asymmetry.

Findings

Strong first order phase transition can be one-step or two-step.

The phase transition type influences the magnitude of baryon asymmetry.

Electroweak baryogenesis can be achieved with the complex singlet model.

Abstract

With the assistance of a complex singlet, and an effective operator involving CP violations, the dark matter relic abundance and baryon asymmetry of the universe have been addressed simul- taneously. We studied the electroweak baryogenesis mechanism systematically. The electroweak phase transition analysis indicates that the strong first order phase transition takes place by one- step or two-step type due to the dynamics of the energy gap between the electroweak vacuum and the vacuum of the complex singlet. The relation between the magnitude of baryon asymmetry of the universe and the phase transition type and strength has been explored in the framework of electroweak baryogenesis.