Strong electroweak phase transition from Supersymmetric Custodial Triplets

TL;DR

This paper investigates how the Supersymmetric Custodial Triplet Model can produce a strong electroweak phase transition and generate detectable gravitational waves, offering a potential probe for new physics beyond the Standard Model.

Contribution

It demonstrates that the model can induce a strong first order phase transition and explores the gravitational wave signals as a novel observational signature.

Findings

Model can produce a strong first order electroweak phase transition.

Gravitational wave signals could be detectable by future interferometers.

Triplet contributions help maintain custodial symmetry and control rho-parameter deviations.

Abstract

The Supersymmetric Custodial Triplet Model, a supersymmetric generalization of the Georgi-Machacek model, has proven to be an interesting modification of the MSSM. It extends the MSSM Higgs sector by three extra SU(2)L triplets in such a way that approximate custodial invariance is preserved and rho-parameter deviations are kept under control. By means of a sizeable triplet contribution to electroweak breaking the model is able to generate a barrier at tree level between the false vacuum and the electroweak one. This will result in a strong first order phase transition for an important region of the parameter space. We also look at the gravitational waves that could be generated as a result of the phase transition and show how future interferometers could be used as a probe of the model.