Baryogenesis From a Dark First-Order Phase Transition

We present a very minimal model for baryogenesis by a dark first-order phase transition. It employs a new dark SU(2)_D gauge group with two doublet Higgs bosons, two lepton doublets, and two singlets. The singlets act as a neutrino portal that transfer the generated asymmetry to the Standard Model. The model predicts ∆N _eff = 0.09–0.13 detectable by future experiments as well as possible signals from exotic decays of the Higgs and Z bosons and stochastic gravitational waves.