Electroweak Phase Transition in an Inert Complex Triplet Model

TL;DR

This paper investigates an extended Higgs sector with an inert triplet, demonstrating regions compatible with collider constraints and strong first-order phase transitions, and explores the potential for gravitational wave detection from these transitions.

Contribution

It introduces a specific inert triplet model extension and analyzes its phase transition dynamics and gravitational wave signatures, which is a novel approach.

Findings

Identifies parameter regions with strong first-order electroweak phase transition.

Predicts gravitational wave spectra from the phase transition.

Discusses prospects for detecting these gravitational waves with future detectors.

Abstract

We study the dynamics of electroweak phase transition in a simple extension of the Standard Model where the Higgs sector is extended by adding an $SU(2)_L$-triplet with hypercharge Y=2. By making random scans over the parameters of the model, we show that there are regions consistent with constraints from collider experiments and the requirement for a strong first-order electroweak phase transition which is needed for electroweak baryogenesis. Further, we also study the power spectrum of the gravitational waves which can be generated due to the first-order phase transitions. Moreover, the detectability of these gravitational waves, via future space-based detectors, is discussed.