The cosmological constant revisited.

Details The cosmological constant revisited. The cosmological constant revisited.

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999prama..53..937s&link_type=abstract

Pramāna, Vol. 53, No. 6, p. 937 - 944

Mathematics

Logic

7

Cosmological Constant

Scientific paper

The author briefly reviews the observational evidence for a small cosmological constant at the present epoch. This evidence mainly comes from high redshift observations of Type Ia supernovae, which, when combined with CMB observations strongly support a flat Universe with Ωm+ ΩΛ≅ 1. Theoretically a cosmological constant can arise from zero point vacuum fluctuations. In addition ultra-light scalar fields could also give rise to a Universe which is accelerating driven by a time dependent Λ-term induced by the scalar field potential. Finally a Λ dominated Universe also finds support from observations of galaxy clustering and the age of the Universe.

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