A closed, expanding universe in string theory

Chiara R. Nappi, Edward Witten

Research output: Contribution to journalArticlepeer-review

118 Scopus citations


We present a conformal field theory - obtained from a gauged WZW model - that describes a closed, inhomogeneous expanding and recollapsing universe in 3 + 1 dimensions. A possible violation of cosmic censorship is avoided because the universe recollapses just when a naked singularity was about to form. The model has been chosen to have c = 4 (or c ̂ = 4 in the supersymmetric case), just like four dimensional Minkowski space.

Original languageEnglish (US)
Pages (from-to)309-314
Number of pages6
JournalPhysics Letters B
Issue number3-4
StatePublished - Oct 29 1992
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


Dive into the research topics of 'A closed, expanding universe in string theory'. Together they form a unique fingerprint.

Cite this