No open or flat bouncing cosmologies in Einstein gravity

Maulik Parikh

doi:10.1007/JHEP10(2015)089

No open or flat bouncing cosmologies in Einstein gravity

Maulik Parikh

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

Abstract: We show that, to first approximation, strings cannot propagate in bouncing open or flat Friedmann-Robertson-Walker universes. Specifically, the Virasoro constraint translates to the Ricci convergence condition in spacetime at leading order in the alpha-prime expansion. Thus one must go beyond minimally-coupled classical Einstein gravity in order to find bounce solutions that could be consistent with string theory. We map out some remaining possibilities for finding string-compatible cosmological bounces.

Original language	English (US)
Article number	89
Journal	Journal of High Energy Physics
Volume	2015
Issue number	10
DOIs	https://doi.org/10.1007/JHEP10(2015)089
State	Published - Oct 1 2015

Keywords

Bosonic Strings
Classical Theories of Gravity

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1007/JHEP10(2015)089

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AB - Abstract: We show that, to first approximation, strings cannot propagate in bouncing open or flat Friedmann-Robertson-Walker universes. Specifically, the Virasoro constraint translates to the Ricci convergence condition in spacetime at leading order in the alpha-prime expansion. Thus one must go beyond minimally-coupled classical Einstein gravity in order to find bounce solutions that could be consistent with string theory. We map out some remaining possibilities for finding string-compatible cosmological bounces.

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KW - Classical Theories of Gravity

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No open or flat bouncing cosmologies in Einstein gravity

Abstract

Keywords

ASJC Scopus subject areas

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