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