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Cosmological consequences of a time-dependent Λ term

Cosmological consequences of a time-dependent Λ term The phenomenological approach to investigate the decay of the effective cosmological constant, as recently proposed by Chen and Wu, is generalized to include a term proportional to H 2 on the time dependence of Λ , where H is the Hubble parameter. This new term can modify some features of the standard Friedmann-Robertson-Walker model and its free parameter may be adjusted in accordance with nucleosynthesis constraints. The model also allows a deceleration parameter q 0 assuming negative values so that the density parameter Ω 0 is smaller than ⅔ and the age of the Universe is always bigger than H 0 - 1 . In these cases, the usual matter creation rate appearing in models with a decaying vacuum energy is smaller than the one present in the steady-state model. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review D American Physical Society (APS)

Cosmological consequences of a time-dependent Λ term

Physical Review D , Volume 46 (6) – Sep 15, 1992
4 pages

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Publisher
American Physical Society (APS)
Copyright
Copyright © 1992 The American Physical Society
ISSN
1089-4918
DOI
10.1103/PhysRevD.46.2404
Publisher site
See Article on Publisher Site

Abstract

The phenomenological approach to investigate the decay of the effective cosmological constant, as recently proposed by Chen and Wu, is generalized to include a term proportional to H 2 on the time dependence of Λ , where H is the Hubble parameter. This new term can modify some features of the standard Friedmann-Robertson-Walker model and its free parameter may be adjusted in accordance with nucleosynthesis constraints. The model also allows a deceleration parameter q 0 assuming negative values so that the density parameter Ω 0 is smaller than ⅔ and the age of the Universe is always bigger than H 0 - 1 . In these cases, the usual matter creation rate appearing in models with a decaying vacuum energy is smaller than the one present in the steady-state model.

Journal

Physical Review DAmerican Physical Society (APS)

Published: Sep 15, 1992

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