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Phenomenology of a realistic accelerating universe using tracker fields

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Abstract

We present a realistic scenario of tracking of scalar fields with varying equation of state. The astrophysical constraints on the evolution of scalar fields in the physical universe are discussed. The nucleosynthesis and the galaxy formation constraints have been used to put limits on Ωφ and estimate ɛ during cosmic evolution. Interpolation techniques have been applied to estimate ɛ ⋍0.772 at the present epoch. The epoch of transition from matter to quintessence dominated era and consequent onset of acceleration in cosmic expansion is calculated and taking the lower limit Θ /0 n =0.2 as estimated from SN e I a data, it is shown that the supernova observations beyond redshift z=1 would reveal deceleration in cosmic expansion.

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  1. Vinod B Johri

    Present address: Department of Mathematics and Astronomy, Lucknow University, 226 007, Lucknow, India

Authors and Affiliations

  1. Theoretical Physics Institute, School of Physics and Astronomy, University of Minnesota, 55455, Minneapolis, MN, USA

    Vinod B Johri

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  1. Vinod B Johri
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Johri, V.B. Phenomenology of a realistic accelerating universe using tracker fields. Pramana - J Phys 59, L553–L561 (2002). https://doi.org/10.1007/s12043-002-0053-0

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  • DOI: https://doi.org/10.1007/s12043-002-0053-0

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