Electroweak baryogenesis and gravitational waves in a composite Higgs model with high dimensional fermion representations

Abstract

Abstract We study electroweak baryogenesis in the SO(6)/SO(5) composite Higgs model with the third generation quarks being embedded in the 20 ′ representation of SO(6). The scalar sector contains one Higgs doublet and one real singlet, and their potential is given by the Coleman-Weinberg potential evaluated from the form factors of the lightest vector and fermion resonances. We show that the resonance masses at O 1 ∼ 10 TeV $$ \mathcal{O}\left(1\sim 10\kern0.5em \mathrm{TeV}\right) $$ can generate a potential that triggers the strong first-order electroweak phase transition (SFOEWPT). The CP violating phase arising from the dimension-6 operator in the top sector is sufficient to yield the observed baryon asymmetry of the universe. The SFOEWPT parameter space is detectable at the future space-based detectors.

Keywords

• Beyond Standard Model
• Cosmology of Theories beyond the SM
• Technicolor and Composite Models
• Thermal Field Theory