Dark photon dark matter from charged inflaton
  We present a scenario of vector dark matter production during inflation
containing a complex inflaton field which is charged under a dark gauge field
and which has a symmetry breaking potential. As the inflaton field rolls
towards the global minimum of the potential the dark photons become massive
with a mass which can be larger than the Hubble scale during inflation. The
accumulated energy of the quantum fluctuations of the produced dark photons
gives the observed relic density of the dark matter for a wide range of
parameters. Depending on the parameters, either the transverse modes or the
longitudinal mode or their combination can generate the observed dark matter
relic energy density.
