Autor:	Petri, G.
Rok vydání:	2008
Předmět:	General Relativity and Quantum Cosmology
Druh dokumentu:	Working Paper
Popis:	We consider a self-interacting scalar field in a de Sitter background and deal with the associated infrared divergences in a purely diagrammatic way using the in-in formalism. In the particular case of a large N O(N) invariant scalar field theory with quartic self-interactions we recover the result 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. Comment: 10 pages, 7 figures, acknoledgments added
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/0810.3330 Zobrazit plný text záznamu View this record from Arxiv