Baryogenesis from a dark first-order phase transition

Abstract

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 $\Delta N_{\text{eff}}=0.09-0.13$ detectable by future experiments as well as possible signals from exotic decays of the Higgs and $Z$ bosons and stochastic gravitational waves.

11+3 pages, 3 figures; v2: published in JHEP with minor revisions (no change to results)

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