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

Abstract

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. At the same time, the second singlet introduces new $CP$-violation phases and triggers a strong first-order EWPT, making electroweak baryogenesis feasible. It turns out that this scenario does not conflict with current observations and it is promising for solving the dark matter and baryon asymmetry puzzles. The tight predictions of the model will be accessible at the forthcoming dark matter direct detection and gravitational wave experiments.

10 pages, 5 figures. V2: discussion on runaway condition clarified, refs added, typos fixed

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• Solving differential equations with neural networks: Applications to the calculation of cosmological phase transitions
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• Baryogenesis and Gravitational Waves from Runaway Bubble Collisions
• Gravitational waves at aLIGO and vacuum stability with a scalar singlet extension of the Standard Model
• Charged Composite Scalar Dark Matter
• Baryon asymmetry generation in the E6CHM
• Neutrino Mass, Dark Matter and Baryon Asymmetry without Lepton Number Violation