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Perturbative corrections to correlation functions for interacting theories inde Sitter spacetime often grow secularly with time, due to the properties offluctuations on super-Hubble scales. This growth can lead to a breakdown ofperturbation theory at late times. We argue that Dynamical RenormalizationGroup (DRG) techniques provide a convenient framework for interpreting andresumming these secularly growing terms. In the case of a massless scalar fieldin de Sitter with quartic self-interaction, the resummed result is also lesssingular in the infrared, in precisely the manner expected if a dynamical massis generated. We compare this improved infrared behavior with large-Nexpansions when applicable.

Super-Hubble de Sitter Fluctuations and the Dynamical RG