PIRSA: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. https://pirsa.org/10100062

Kumar, Jason. The Feynman Propagator and Correlation Functions in an Inflating Spacetime. Perimeter Institute, Oct. 27, 2010, https://pirsa.org/10100062 

          @misc{ pirsa_PIRSA:10100062,
            doi = {10.48660/10100062},
            url = {https://pirsa.org/10100062},
            author = {Kumar, Jason},
            keywords = {Cosmology},
            language = {en},
            title = {The Feynman Propagator and Correlation Functions in an Inflating Spacetime},
            publisher = {Perimeter Institute},
            year = {2010},
            month = {oct},
            note = {PIRSA:10100062 see, \url{https://pirsa.org}}
          }

Jason Kumar University of Hawaii at Manoa

DOI 10.48660/10100062
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.