A unified explanation for dark matter and electroweak baryogenesis with direct detection and gravitational wave signatures

Understand

A minimal extension of the Standard Model that provides both a dark matter candidate and a strong first-order electroweak phase transition (EWPT) consists of two additional Lorentz and gauge singlets.

• In this paper we work out a composite Higgs version of this scenario, based on the coset $SO(7)/SO(6)$.
• We show that by embedding the elementary fermions in appropriate representations of $SO(7)$, all dominant interactions are described by only three free effective parameters.
• Within the model dependencies of the embedding, the theory predicts one of the singlets to be stable and responsible for the observed dark matter abundance.