A Diagrammatic Approach to Scalar Field Correlators during Inflation

Details A Diagrammatic Approach to Scalar Field Correlators during Inflation A Diagrammatic Approach to Scalar Field Correlators during Inflation

2008-10-18

arxiv.org/abs/0810.3330v2

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

10 pages, 7 figures, acknoledgments added

Scientific paper

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.

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