Back Reaction Of Perturbations In Two Scalar Field Inflationary Models

Details Back Reaction Of Perturbations In Two Scalar Field Inflationary Models Back Reaction Of Perturbations In Two Scalar Field Inflationary Models

2003-10-29

arxiv.org/abs/hep-th/0310265v1

JCAP 0504:006,2005

Physics

High Energy Physics

High Energy Physics - Theory

9 pages, no figures

Scientific paper

10.1088/1475-7516/2005/04/006

We calculate the back-reaction of long wavelength cosmological perturbations on a general relativistic measure of the local expansion rate of the Universe. Specifically, we consider a cosmological model in which matter is described by two scalar matter fields, one being the inflaton and the other one representing a matter field which is used as a clock. We analyze back-reaction in a phase of inflaton-driven slow-roll inflation, and find that the leading infrared back-reaction terms contributing to the evolution of the expansion rate do not vanish when measured at a fixed value of the clock field. We also analyze the back-reaction of entropy modes in a specific cosmological model with negative square mass for the entropy field and find that back-reaction can become significant. Our work provides evidence that, in general, the back-reaction of infrared fluctuations could be locally observable.

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