Loops in reheating and cosmological perturbations
  We show that in scalar field inflationary models, the loop corrections in
reheating corresponding to the decay of the inflaton can cause nontrivial
superhorizon evolution of the curvature perturbation. The effect turns out to
be prominent when the decay occurs via parametric resonance, even indicating
the breakdown of the perturbation theory, as we demonstrate in a specific
model.
