Constructing Infrared Finite Propagators in Inflating Space-time

Details Constructing Infrared Finite Propagators in Inflating Space-time Constructing Infrared Finite Propagators in Inflating Space-time

2010-02-22

arxiv.org/abs/1002.4214v1

Physics

High Energy Physics

High Energy Physics - Theory

7 pages

Scientific paper

The usual (Bunch-Davies) Feynman propagator of a massless field is not well defined in an expanding universe due to the presence of infrared divergences. We propose a new propagator which yields infrared finite answers to any correlation function. The key point is that in a de Sitter spacetime there is an ambiguity in the zero-mode of the propagator. This ambiguity can be used to cancel the apparent divergences which arise in some loop calculations in eternally (or semi-eternally) inflating spacetime. We refer to this process as zero-mode modification. The residual ambiguity is fixed by observational measurement. We also discuss the application of this method to calculations involving the graviton propagator.

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