On Resumming Inflationary Perturbations beyond One-loop

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dc.creatorRiotto, Antonio
dc.creatorSloth, Martin S.
dc.date2008-01-11
dc.date2008-04-08
dc.date.accessioned2026-07-07T11:55:11Z
dc.date.available2026-07-07T11:55:11Z
dc.descriptionIt is well known that the correlation functions of a scalar field in a quasi-de Sitter space exhibit at the loop level cumulative infra-red effects proportional to the total number of e-foldings of inflation. Using the in-in formalism, we explore the behavior of these infra-red effects in the large N limit of an O(N) invariant scalar field theory with quartic self-interactions. By resumming all higher-order loop diagrams non-perturbatively, we show that the connected four-point correlation function, which is a signal of non-Gaussianity, is non-perturbatively enhanced with respect to its tree-level value.
dc.description17 pages, v2: minor corrections, to appear in jcap
dc.identifierhttps://arxiv.org/abs/0801.1845
dc.identifierhttp://arxiv.org/abs/0801.1845
dc.identifierJCAP0804:030,2008
dc.identifierdoi:10.1088/1475-7516/2008/04/030
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/205160
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectAstrophysics
dc.subjectHigh Energy Physics - Theory
dc.titleOn Resumming Inflationary Perturbations beyond One-loop
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