Loop effects and infrared divergences in slow-roll inflation
  Loop corrections to observables in slow-roll inflation are found to diverge
no worse than powers of the log of the scale factor, extending Weinberg's
theorem to quasi-single field inflation models. Demanding perturbation theory
be valid during primordial inflation leads to constraints on the effective
lagrangian. This leads to some interesting constraints and coincidences on the
landscape of inflationary vacua.
