General Relativity and Gravitation

, Volume 27, Issue 11, pp 1137–1144

The cosmological constant is back

  • Lawrence M. Krauss
  • Michael S. Turner

DOI: 10.1007/BF02108229

Cite this article as:
Krauss, L.M. & Turner, M.S. Gen Relat Gravit (1995) 27: 1137. doi:10.1007/BF02108229


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.

Copyright information

© Plenum Publishing Corporation 1995

Authors and Affiliations

  • Lawrence M. Krauss
    • 1
  • Michael S. Turner
    • 2
    • 3
  1. 1.Departments of Physics and of AstronomyCase Western Reserve UniversityClevelandUSA
  2. 2.Departments of Physics and of Astronomy and Astrophysics, Enrico Fermi InstituteThe University of ChicagoChicagoUSA
  3. 3.NASA/Fermilab Astrophysics CenterFermi National Accelerator LaboratoryBataviaUSA

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