Skip to main content
Article thumbnail
Location of Repository

Eliminating infrared divergences in an inflationary cosmology

By Diego Chialva and Anupam Mazumdar

Abstract

We study the infrared divergences arising from gravitational loops in the standard cosmological perturbation theory. We provide a simple solution to the problem at all orders of cosmological perturbation theory by redefining the perturbation theory in terms of a local observer. We propose to reformulate the standard perturbations in the in-in formalism, and obtain an infrared safe perturbation theory. Our results do not depend on any infrared cutoffs or similar parameters. We then present an explicit example of graviton one-loop corrections, and briefly discuss non-gaussianities.Comment: 18 pages plus bibliography; improved presentation of the new redefined perturbation theory centred on locality; improved discussion and comparison with other approaches in the literature based for example on redefinition of the background or the gauge transformations, showing in a clearer way the differences between such approaches and our

Topics: High Energy Physics - Theory, Astrophysics - Cosmology and Nongalactic Astrophysics, General Relativity and Quantum Cosmology, High Energy Physics - Phenomenology
Year: 2012
OAI identifier: oai:arXiv.org:1103.1312
Download PDF:
Sorry, we are unable to provide the full text but you may find it at the following location(s):
  • http://arxiv.org/abs/1103.1312 (external link)
  • Suggested articles


    To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.