The cosmological constant revisited

Sahni, Varun (1999) The cosmological constant revisited Pramana - Journal of Physics, 53 (6). pp. 937-944. ISSN 0304-4289

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I briefly review the observational evidence for a small cosmological constant at the present epoch. This evidence mainly comes from high redshift observations of Type 1a supernovae, which, when combined with CMB observations strongly support a flat Universe with ΩmA @ 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.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
Keywords:Cosmology; Supernovae; Cosmic Microwave Background; Cosmological Constant; Vacuum Fluctuations
ID Code:46266
Deposited On:04 Jul 2011 11:10
Last Modified:18 May 2016 02:13

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