Asymmetric matter from a dark first-order phase transition

We introduce a model for matter genesis in which both the baryonic and dark matter asymmetries originate from a first-order phase transition in a dark sector with an SU(3) x SU(2) x U(1) gauge group and minimal matter content. In the simplest scenario, we predict that dark matter is a dark antineutron with mass of either mn over bar = 1.36 GeV or mn over bar = 1.63 GeV. Alternatively, dark matter may be comprised of equal numbers of dark antiprotons and pions. In either scenario, this model is highly discoverable through both dark matter direct detection and dark photon search experiments. The strong dark matter self-interactions may ameliorate small-scale structure problems, while the strongly first-order phase transition may be confirmed at future gravitational wave observatories.

Automated summary

We propose a model where both the baryonic and dark matter asymmetries originate from a first-order phase transition in a dark sector. The model includes an SU(3) x SU(2) x U(1) gauge group and minimal matter content. The dark matter is predicted to be a dark antineutron with mass of either 1.36 GeV or 1.63 GeV, or a combination of dark antiprotons and pions. The model can be highly discoverable through direct detection and dark photon search experiments, and may also provide solutions to small-scale structure problems and be confirmed by future gravitational wave observatories.