  Models of fermion and scalar dark matter abound. Here we consider instead
vector dark matter, from an SU(2)_N extension of the standard model. It has a
number of interesting properties, including a possible implementation of the
inverse seesaw mechanism for neutrino mass. The annihilation of dark matter for
calculating its relic abundance in this model is not dominated by its cross
section to standard-model particles, but rather to other new particles which
are in thermal equilibrium with those of the standard model.
