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PIRSA:10100062

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https://pirsa.org/10100062

The Feynman Propagator and Correlation Functions in an Inflating Spacetime

Kumar, J. (2010). The Feynman Propagator and Correlation Functions in an Inflating Spacetime. Perimeter Institute for Theoretical Physics. https://pirsa.org/10100062

Jason Kumar University of Hawaii at Manoa

Talk numberPIRSA:10100062
DOI10.48660/10100062
Source RepositoryPIRSA
Collection
Talk Type Conference
Subject

Abstract

We discuss the definition of the Feynman propagator in de Sitter space. We show that the ambiguities in the propagator zero-mode can be used to make sense of the behavior of low-momentum modes in an inflating space-time. We use this tool to calculate loop corrections to non-Gaussian correlation functions, and show that there are limits where the loop terms dominate. These models can be probed with the Planck satellite.