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

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Abstract

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.

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Authors and Affiliations

  1. Department of Mathematics, Hindu Post-graduate College, Zamania, 232 331, Ghazipur, Uttar Pradesh, India

    Anirudh Pradhan

  2. Department of Physics, Faculty of Science, The M S University of Baroda, Vadodara, 390 002, Gujrat, India

    Kanti Jotania

Authors
  1. Anirudh Pradhan
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  2. Kanti Jotania
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Correspondence to Anirudh Pradhan.

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Pradhan, A., Jotania, K. A class of new LRS Bianchi type-I perfect fluid universes with decaying vacuum energy density Λ . Indian J Phys 85, 497–514 (2011). https://doi.org/10.1007/s12648-011-0052-4

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  • DOI: https://doi.org/10.1007/s12648-011-0052-4

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