Affordable Access

deepdyve-link deepdyve-link
Publisher Website

Scalar field quantum fluctuations and fine tuning in chaotic inflationary models

Authors
  • Yi, I.
  • Vishniac, E.T.
Publication Date
Jan 01, 1993
Identifiers
DOI: 10.1103/PhysRevD.47.5295
OAI: oai:inspirehep.net:362676
Source
INSPIRE-HEP
License
Unknown
External links

Abstract

During chaotic inflation, the dispersion of a scalar field can show interesting nonlinear effects. This is not seen in treatments which combine a deterministic description for the mean-field evolution with a diffusion approximation for the quantum fluctuations. We derive a criterion which distinguishes the diffusive regime from the nonlinear regime using stochastic dynamics in models of noninteracting multiple scalar fileds. In the nonlinear regime, dispersion estimates based on a simple diffusion approximation fail due to a strong nonlinear drift effect. We give some simple numerical examples to support this result. We apply our results to a double inflation model and show that estimates of the probability of successful inflation depend on a correct treatment of nonlinear effects. Including them greatly reduces the amount of fine-tuning necessary in this model.

Report this publication

Statistics

Seen <100 times