Strong electroweak phase transition in a model with extended scalar sector

TL;DR

This paper explores an extended Standard Model with additional singlets that induces a strong first order electroweak phase transition, producing detectable gravitational waves and affecting Higgs self-couplings.

Contribution

It demonstrates that the extended scalar sector can lead to a strong first order phase transition with observable gravitational wave signals and measurable Higgs coupling deviations.

Findings

Gravitational wave signals are within reach of future detectors like eLISA.

The model predicts significant deviations in Higgs self-couplings.

A strong first order phase transition is achievable in the extended scalar sector.

Abstract

In this paper we consider an extension of the Standard Model(SM) with additional gauge singlets which exhibits a strong first order phase transition. Due to this first order phase transition in the early universe gravitational waves are produced. We estimate the contributions such as the sound wave, the bubble wall collision and the plasma turbulence to the stochastic gravitational wave background, and we find that the strength at the peak frequency is large enough to be detected at future gravitational interferometers such as eLISA. Deviations in the various Higgs boson self couplings are also evaluated.