Dark Matter Freeze-out During Matter Domination
  We highlight the general scenario of dark matter freeze-out whilst the energy
density of the universe is dominated by a decoupled non-relativistic species.
Decoupling during matter domination changes the freeze-out dynamics, since the
Hubble rate is parametrically different for matter and radiation domination.
Furthermore, for successful Big Bang Nucleosynthesis the state dominating the
early universe energy density must decay, this dilutes (or repopulates) the
dark matter. As a result, the masses and couplings required to reproduce the
observed dark matter relic density can differ significantly from radiation
dominated freeze-out.
