No Open or Flat Bouncing Cosmologies in Einstein Gravity
High Energy Physics - Theory
2015-01-26 v2 Cosmology and Nongalactic Astrophysics
General Relativity and Quantum Cosmology
Abstract
We show that bouncing open or flat Friedmann-Robertson-Walker cosmologies are inconsistent with worldsheet string theory to first approximation. Specifically, the Virasoro constraint translates to the null energy condition in spacetime at leading order in the alpha-prime expansion. Thus one must go beyond minimally-coupled Einstein gravity in order to find bounce solutions.
Cite
@article{arxiv.1501.04606,
title = {No Open or Flat Bouncing Cosmologies in Einstein Gravity},
author = {Maulik K. Parikh},
journal= {arXiv preprint arXiv:1501.04606},
year = {2015}
}
Comments
11 pages, LaTeX, discussion expanded and references added