Sahni, Varun (1999) The cosmological constant revisited Pramana - Journal of Physics, 53 (6). pp. 937-944. ISSN 0304-4289
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Official URL: http://www.ias.ac.in/pramana/v53/p937/fulltext.pdf
Related URL: http://dx.doi.org/10.1007/s12043-999-0048-1
Abstract
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 Ωm+ΩA @ 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 |
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| 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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