No Open or Flat Bouncing Cosmologies in Einstein Gravity

Maulik K. Parikh

Authors on Pith no claims yet

classification ✦ hep-th astro-ph.COgr-qc

keywords bouncingcosmologieseinsteinflatgravityopenorderalpha-prime

read the original 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.

This paper has not been read by Pith yet.

discussion (0)

Forward citations

Cited by 1 Pith paper

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

Energy conditions of bouncing solutions in quadratic curvature gravity coupled with a scalar field
gr-qc 2026-03 unverdicted novelty 4.0

Bouncing solutions in quadratic curvature gravity with a scalar field satisfy null, weak, and dominant energy conditions but violate the strong one when using the scalar-field energy-momentum tensor, while all four co...