Dark origins of matter-antimatter asymmetry
  In a non-minimal Higgs framework, we present a novel mechanism in which the
CP violating dark particles only interact with the SM through the gauge bosons,
primarily the $Z$ boson. Such $Z$-portal dark CP violation is realised in the
regions of the parameter space where Higgs-mediated (co)annihilation processes
are sub-dominant and have negligible contributions to the DM relic density. We
show that such $Z$-portal CP violating DM can still thermalise and satisfy all
experimental and observational bounds and discuss implications of such
phenomena for electroweak baryogenesis.
