Nonperturbative enhancement of nonGaussian correlators in de Sitter
space [PDF]
Julien SerreauWe compute the four-point correlation function of a light O(N) scalar field in de Sitter space in the large-N limit. For superhorizon momentum modes, infrared effects strongly enhance the size of loop contributions. We find that in the deep infrared limit, the latter are of the same order as the tree-level one. The resulting nonGaussian correlator presents a singular momentum dependence.View original: http://arxiv.org/abs/1302.6365
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