The Sun as a sub-GeV Dark Matter Accelerator
  Sub-GeV halo dark matter that enters the Sun can potentially scatter off hot
solar nuclei and be ejected much faster than its incoming velocity. We derive
an expression for the rate and velocity distribution of these reflected
particles taking into account the Sun's temperature and opacity. We further
demonstrate that future direct detection experiments could use these energetic
reflected particles to probe light dark matter in parameter space that cannot
be accessed via ordinary halo dark matter.
