  We propose that the universe contains two identical sets of particles and
gauge interactions, coupling only through gravitation, which differ by their
Higgs potentials. We postulate that because of underlying symmetries, the two
sectors when uncoupled have Higgs potentials that lie at the boundary between
phases with nonzero and zero Higgs vacuum expectation. Turning on the coupling
between the two sectors can break the degeneracy, pushing the Higgs potential
in one sector into the domain of nonzero Higgs expectation (giving the visible
sector), and pushing the Higgs potential in the other sector into the domain of
zero Higgs expectation (giving the dark sector). The least massive baryon in
the dark sector will then be a candidate self-interacting dark matter particle.
