First-order phase transitions in Twin Higgs models

Abstract

We revisit phase transitions in Twin Higgs (TH) models. We show that strong first-order phase transitions (FOPTs) can occur provided that appropriate source of ${\mathbb{Z}}_2$ symmetry breaking between the twin and Standard Model (SM) sectors is present. We found FOPTs in two classes of models. First: with hard ${\mathbb{Z}}_2$ breaking in the scalar potential allowing for FOPT. Second: with ${\mathbb{Z}}_2$ broken by enhanced Yukawa couplings of twin leptons. We also considered supersymmetric UV completion of the second scenario with light sleptons. The signal of gravitational waves produced during these phase transitions is typically small but can be close to the reach of AEDGE and Einstein Telescope in the case of the FOPT induced by light twin sleptons. Our results open a way to generate SM baryon asymmetry in TH models.

36 pages, 18 figures. v2: comments and references added, typos corrected; version to be published

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Cited by in corpus (6)

• Mirror QCD phase transition as the origin of the nanohertz Stochastic Gravitational-Wave Background
• The hydrodynamics of inverse phase transitions
• Baryogenesis through Asymmetric Reheating in the Mirror Twin Higgs
• Inverse bubbles from broken supersymmetry
• Review of Neutral Naturalness
• Gravitational waves from the sound shell model: direct and inverse phase transitions in the early Universe