We introduce a model for matter s -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 ) \times SU ( 2 ) \times U ( 1 ) gauge group and minimal matter content .
In the simplest scenario , we predict that dark matter is a dark neutron with mass either m _ { n } = 1.33 GeV or m _ { n } = 1.58 GeV .
Alternatively , dark matter may be comprised of equal numbers of dark protons and pions .
This model , in either scenario , 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 .