Phase transition in multi-scalar-singlet extensions of the Standard Model

TL;DR

This paper explores a generalized Standard Model with two real singlet scalars, enhancing the electroweak phase transition and proposing a dark matter candidate, while analyzing the impact of a heavy scalar on phase transition strength.

Contribution

It introduces a two-singlet extension of the Standard Model, demonstrating how this setup can produce a strong first-order electroweak phase transition and accommodate dark matter.

Findings

Two scalar fields make the model less vulnerable to experimental constraints.

Configurations with a heavy scalar can produce a strong first-order EWPT.

The model allows for interaction between singlets and the Higgs boson.

Abstract

We propose a generalization of the Standard Model (SM) by adding two real gaugesinglets S1, S2. The field S1 will improve the strength of the electroweak phase transition (EWPT). Imposing a Z2 symmetry on the field S2 makes this field a possible candidate for dark matter. Both singlets interact with other observable fields through Higgs boson. They are allowed to interact with each other as well. We find that by introducing two different scalar fields, the model is less vulnerable to experimental constraints. In this paper, we consider the effects of a heavy scalar(M1 > MH) on the electroweak phase transition. And we present configurations that produce a strong first order EWPT.