A class of new LRS Bianchi type-I perfect fluid universes with decaying vacuum energy density Λ

A class of new LRS Bianchi type-I cosmological models with a variable cosmological term is investigated in presence of perfect fluid. A procedure to generate new exact solutions to Einstein’s field equations is applied to LRS Bianchi type-I space-time. Starting from some known solutions a class of n...

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Bibliographic Details
Published in:Indian journal of physics 2011-03, Vol.85 (3), p.497-514
Main Authors: Pradhan, Anirudh, Jotania, Kanti
Format: Article
Language:English
Subjects:
Astrophysics and Astroparticles
Physics
Physics and Astronomy
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Summary:A class of new LRS Bianchi type-I cosmological models with a variable cosmological term is investigated in presence of perfect fluid. A procedure to generate new exact solutions to Einstein’s field equations is applied to LRS Bianchi type-I space-time. Starting from some known solutions a class of new perfect fluid solutions of LRS Bianchi type-I are obtained. The cosmological constant Λ is found to be positive and a decreasing function of time which is supported by results from recent supernovae Ia observations. The physical and geometric properties of spatially homogeneous and anisotropic cosmological models are discussed.
ISSN:0019-5480
0974-9845
DOI:10.1007/s12648-011-0052-4