Minimal nonabelian model of atomic dark matter
  A dark sector resembling the standard model, where the abundance of matter is
explained by baryon and lepton asymmetries, and stable constituents bind to
form atoms, is a theoretically appealing possibility. We show that a minimal
model with a hidden SU(2) gauge symmetry broken to U(1), with a Dirac fermion
doublet, suffices to realize this scenario. Supplemented with a dark Higgs
doublet that gets no VEV, we readily achieve the dark matter asymmetry through
leptogenesis. The model can simultaneously have three portals to the standard
model, through the Higgs, nonabelian kinetic mixing, and the heavy neutrino,
with interesting phenomenology for direct and collider searches, as well as
cosmologically relevant DM self-interactions. Exotic bound states consisting of
two fermions and a doubly-charged vector boson can exist in one phase of the
theory.
