No open or flat bouncing cosmologies in Einstein gravity

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


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 languageEnglish (US)
Article number89
JournalJournal of High Energy Physics
Issue number10
StatePublished - Oct 1 2015


  • Bosonic Strings
  • Classical Theories of Gravity

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


Dive into the research topics of 'No open or flat bouncing cosmologies in Einstein gravity'. Together they form a unique fingerprint.

Cite this