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Phenomenology of Λ-CDM Model: A Possibility of Accelerating Universe with Positive Pressure

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Abstract

Among various phenomenological Λ models, a time-dependent model \(\dot{\Lambda}\sim H^{3}\) is selected here to investigate the Λ-CDM cosmology. The model can follow from dynamics, underlying the origin of Λ. Using this model the expressions for the time-dependent equation of state parameter ω and other physical parameters are derived. It is shown that in H 3 model accelerated expansion of the Universe takes place at negative energy density, but with a positive pressure. It has also been possible to obtain the change of sign of the deceleration parameter q during cosmic evolution.

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Authors and Affiliations

  1. Department of Physics, Government College of Engineering and Ceramic Technology, Kolkata, 700 010, West Bengal, India

    Saibal Ray

  2. Center for Cosmoparticle Physics “Cosmion”, 125047, Moscow, Russia

    Maxim Khlopov

  3. National Research Nuclear University “Moscow Engineering Physics Institute”, 115409, Moscow, Russia

    Maxim Khlopov

  4. APC laboratory 10, rue Alice Domon et Léonie Duquet, 75205, Paris Cedex 13, France

    Maxim Khlopov

  5. Department of Physics, A.J.C. Bose Polytechnic, Berachampa, North 24 Parganas, Devalaya, 743 424, West Bengal, India

    Partha Pratim Ghosh

  6. Satyabharati Vidyapith, Nabapalli, North 24 Parganas, Kolkata, 700 126, West Bengal, India

    Utpal Mukhopadhyay

Authors
  1. Saibal Ray
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  2. Maxim Khlopov
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  3. Partha Pratim Ghosh
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  4. Utpal Mukhopadhyay
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Correspondence to Saibal Ray.

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Ray, S., Khlopov, M., Ghosh, P.P. et al. Phenomenology of Λ-CDM Model: A Possibility of Accelerating Universe with Positive Pressure. Int J Theor Phys 50, 939–951 (2011). https://doi.org/10.1007/s10773-010-0639-0

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  • DOI: https://doi.org/10.1007/s10773-010-0639-0

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