The evolution of vacuum states and phase transitions in 2HDM during cooling of Universe

TL;DR

This paper explores how the ground state and phase transitions in the Two Higgs Doublet Model evolve during the Universe's cooling, highlighting the impact of parameter variations on thermal history.

Contribution

It analyzes the sequence of thermal phase transitions in 2HDM during cosmic cooling, considering different parameter regions and their effects on physical properties.

Findings

Different parameter regions lead to distinct phase transition sequences.

The evolution paths influence the physical properties of the system.

The study provides a framework for understanding phase transitions in early Universe models.

Abstract

We consider the evolution of the ground state in the Two Higgs Doublet Model during cooling down of the Universe after the Big Bang. Different regions in the space of free parameters of this model correspond to different sequences of thermal phase transitions. We discuss different paths of thermal evolution and corresponding evolution of physical properties of the system for different modern values of the parameters.