The stability analysis of the extended singlet scalar model with two high scale minima

TL;DR

This paper analyzes the stability of an extended singlet scalar dark matter model, revealing multiple high-scale minima influenced by Yukawa couplings and renormalization group evolution, and maps out the parameter space for vacuum stability.

Contribution

It introduces a detailed stability analysis of a singlet scalar dark matter model with new minima along the scalar field, considering the effects of Yukawa couplings and RG evolution.

Findings

Multiple high-scale minima found along scalar field directions.

Yukawa couplings significantly affect vacuum stability.

Parameter space mapped for electroweak vacuum metastability.

Abstract

We study the simplest viable dark matter (DM) model with a real singlet scalar, vector-like singlet, and doublet fermions. The Yukawa couplings associated with the fermion sector are important in obtaining the current DM relic density through Freeze-out and Freeze-in mechanisms. In addition to the standard model-like high scale minima along the Higgs field, we find other high scale minima along the singlet scalar field direction. The other minima appears due to the renormalisation group evolutions of the couplings involving the gauge sector, Higgs portal, and the new Yukawa sector. A detailed study of the parameter space identifying the region of electroweak vacuum stability and metastability along different directions of the scalar field is carried out using different phase diagrams.