Thermal Relic Targets with Exponentially Small Couplings
  If dark matter was produced in the early Universe by the decoupling of its
annihilations into known particles, there is a sharp experimental target for
the size of its coupling. We show that if dark matter was produced by inelastic
scattering against a lighter particle from the thermal bath, then its coupling
can be exponentially smaller than the coupling required for its production from
annihilations. As an application, we demonstrate that dark matter produced by
inelastic scattering against electrons provides new thermal relic targets for
direct detection and fixed target experiments.
