Super-Hubble de Sitter Fluctuations and the Dynamical RG

Details Super-Hubble de Sitter Fluctuations and the Dynamical RG Super-Hubble de Sitter Fluctuations and the Dynamical RG

2009-12-09

arxiv.org/abs/0912.1608v1

JCAP 1003:033,2010

Physics

High Energy Physics

High Energy Physics - Theory

33 pages, 4 figures

Scientific paper

10.1088/1475-7516/2010/03/033

Perturbative corrections to correlation functions for interacting theories in de Sitter spacetime often grow secularly with time, due to the properties of fluctuations on super-Hubble scales. This growth can lead to a breakdown of perturbation theory at late times. We argue that Dynamical Renormalization Group (DRG) techniques provide a convenient framework for interpreting and resumming these secularly growing terms. In the case of a massless scalar field in de Sitter with quartic self-interaction, the resummed result is also less singular in the infrared, in precisely the manner expected if a dynamical mass is generated. We compare this improved infrared behavior with large-N expansions when applicable.

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