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Variable Equation of State for Generalized Dark Energy Model

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Abstract

We present a model for the present accelerating Universe and focus on the different important physical variables involved in the model under the phenomenological assumption Λ∝H 2 with a prescription for equation of state parameter in the form \(\omega(t)=\omega_{0}+\frac{\omega_{1}\tau}{t^{2}}\), where ω 0 and ω 1 are two constants and τ is a parameter having dimension of time t 2. General expressions for the density parameter Ω and deceleration parameter q are obtained which under specific bound reproduce some of the previous results. We explore physical features of these parameters which (i) provide the scenario of complete evolution of the cosmos with ω(t) and (ii) agree mostly with the observational status of the present phase of the accelerating Universe.

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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. Department of Mathematics, Jadavpur University, Kolkata, 700 032, West Bengal, India

    Farook Rahaman

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

    Utpal Mukhopadhyay

  4. Future Campus School, Sonarpur, Kolkata, 700 150, West Bengal, India

    Ruby Sarkar

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  1. Saibal Ray
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  2. Farook Rahaman
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  3. Utpal Mukhopadhyay
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  4. Ruby Sarkar
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Correspondence to Saibal Ray.

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Ray, S., Rahaman, F., Mukhopadhyay, U. et al. Variable Equation of State for Generalized Dark Energy Model. Int J Theor Phys 50, 2687–2696 (2011). https://doi.org/10.1007/s10773-011-0766-2

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  • DOI: https://doi.org/10.1007/s10773-011-0766-2

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