Uniqueness of de Sitter space

Gregory J. Galloway, Didier A. Solis

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


All inextendible null geodesics in four-dimensional de Sitter space dS 4 are complete and globally achronal. This achronality is related to the fact that all observer horizons in dS4 are eternal, i.e. extend from future infinity all the way back to past infinity . We show that the property of having a null line (inextendible achronal null geodesic) that extends from to characterizes dS4 among all globally hyperbolic and asymptotically de Sitter spacetimes satisfying the vacuum Einstein equations with positive cosmological constant. This result is then further extended to allow for a class of matter models that includes perfect fluids.

Original languageEnglish (US)
Article number021
Pages (from-to)3125-3138
Number of pages14
JournalClassical and Quantum Gravity
Issue number11
StatePublished - Jun 7 2007

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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