The Parametric Space of the Two-Higgs-Doublet Model and Sakharov's Baryogenesis Conditions

TL;DR

This paper analyzes the electroweak phase transition in the Two-Higgs-Doublet Model, identifying parameter regions that support strong first-order transitions compatible with Sakharov's baryogenesis conditions, including possible sequences of phase transitions.

Contribution

It provides a detailed computation of the Gibbs potential at finite temperature and derives conditions for first-order phase transitions in the Two-Higgs-Doublet Model, considering experimental constraints.

Findings

Strong first-order phase transition regions identified

Relation between model parameters and phase transition nature established

Sequence of phase transitions shown to be possible

Abstract

The electroweak phase transition in the Two-Higgs-Doublet Model is investigated. The Gibbs potential at finite temperature is computed with regard for the one-loop plus ring diagram contributions. The strong first-order phase transition satisfying Sakharov's baryogenesis conditions is determined for the values of scalar field masses allowed by experimental data. The relation between the model parameters supplying the phase transition to be of the first order is derived. It is shown that a sequence of phase transitions is also possible. A comparison with results of other authors is done.