The cosmological constant is back

Lawrence M. Krauss, Michael S. Turner

Research output: Contribution to journalArticlepeer-review

321 Scopus citations


A diverse set of observations now compellingly suggest that the universe possesses a nonzero cosmological constant. In the context of quantum-field theory a cosmological constant corresponds to the energy density of the vacuum, and the favored value for the cosmological constant corresponds to a very tiny vacuum energy density. We discuss future observational tests for a cosmological constant as well as the fundamental theoretical challenges - and opportunities - that this poses for particle physics and for extending our understanding of the evolution of the universe back to the earliest moments.

Original languageEnglish (US)
Pages (from-to)1137-1144
Number of pages8
JournalGeneral Relativity and Gravitation
Issue number11
StatePublished - Nov 1995
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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