Gravitational Waves from Phase Transitions in Models with Charged Singlets

TL;DR

This paper explores how adding charged singlet scalars to the Standard Model influences the strength of the electroweak phase transition and the resulting gravitational wave signals, identifying conditions detectable by future experiments.

Contribution

It analyzes the impact of charged singlet scalars on electroweak phase transition strength and gravitational wave spectra within an extended Standard Model framework.

Findings

Identification of parameter regions with strong first-order EWPT

Predictions of gravitational wave spectra within reach of future detectors

Constraints on singlet scalar multiplicity and coupling strengths

Abstract

We investigate the effect of extra singlets on the electroweak phase transition (EWPT) strength and the spectrum of the corresponding gravitational waves (GWs). We consider here the standard model (SM) extended with a singlet scalar with multiplicity N coupled to the SM Higgs doublet. After imposing all the theoretical and experimental constraints and defining the region where the EWPT is strongly first order, we obtain the region in which the GWs spectrum can be reached by different future experiments such as LISA and DECIGO.