Resonant Sub-GeV Dirac Dark Matter
  We study the phenomenology and detection prospects of a sub-GeV Dirac dark
matter candidate with resonantly enhanced annihilations via a dark photon
mediator. The model evades cosmological constraints on light thermal particles
in the early universe while simultaneously being in reach of current and
upcoming terrestrial experiments. We conduct a global analysis of the parameter
space , considering bounds from accelerator and direct detection experiments,
as well as those arising from Big Bang Nucleosynthesis, the Cosmic Microwave
Background and dark matter self-interactions. We also extend our discussion to
the case of a dark matter subcomponent. We find that large regions of parameter
space remain viable even for the case of a moderate resonant enhancement, and
demonstrate the complementarity of different experimental strategies for
further exploring this scenario.
