Production of Gravitational Waves in the nMSSM

TL;DR

This paper investigates gravitational wave production during the electroweak phase transition in the nMSSM, finding the signals are generally too weak for near-future detection, but exploring potential enhancements in alternative models.

Contribution

It provides a detailed analysis of gravitational wave signals in the nMSSM and compares them with a Standard Model extension, highlighting the challenges for detection.

Findings

Gravitational wave signals in the nMSSM are too weak for near-future detection.

A Standard Model with dimension-six Higgs potential produces a slightly stronger gravitational wave signal.

Correlation between gravitational wave production and baryogenesis is discussed.

Abstract

During a strongly first-order phase transition gravitational waves are produced by bubble collisions and turbulent plasma motion. We analyze the relevant characteristics of the electroweak phase transition in the nMSSM to determine the generated gravitational wave signal. Additionally, we comment on correlations between the production of gravitational waves and baryogenesis. We conclude that the gravitational wave relic density in this model is generically too small to be detected in the near future by the LISA experiment. We also consider the case of a "Standard Model" with dimension-six Higgs potential, which leads to a slightly stronger signal of gravitational waves.