  We discuss the properties of a cosmology dominated by a charged scalar field
with a repulsive, long-range self-interaction. The interaction, in the form of
a vector field with a tiny mass, can have a dramatic effect on the evolution of
the universe, with interesting consequences -- including in some cases
accelerated expansion. One characteristic of the model is an oscillating
deceleration parameter, which would potentially allow it to be distinguished
from other scalar field models such as quintessence.
