Impact of bound states on non-thermal dark matter production
  We explore the impact of non-perturbative effects, namely Sommerfeld
enhancement and bound state formation, on the cosmological production of
non-thermal dark matter. For this purpose, we focus on a class of simplified
models with t-channel mediators. These naturally combine the requirements for
large corrections in the early Universe, i.e. beyond the Standard Model states
with long range interactions, with a sizable new physics production cross
section at the LHC. We find that the dark matter yield of the superWIMP
mechanism is suppressed considerably due to the non-perturbative effects under
consideration. This leads to a significant shift in the cosmologically
preferred parameter space of non-thermal dark matter in these models. We also
revisit the implications of LHC bounds on long-lived particles associated with
non-thermal dark matter and find that testing this scenario at the LHC is a
bigger challenge than previously anticipated.
