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Cosmic-coincidence problem and variable constants of physics

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Abstract

The standard model of cosmology is investigated using a time-dependent cosmological constant Λ and Newton gravitational constant G. The total energy content is described by the modified Chaplygin gas equation of state. It is found that the time-dependent constants coupled with the modified Chaplygin gas interpolate between the earlier matter to the later dark-energy dominated phase of the universe. We also achieve a convergence of the parameter ω→−1, almost at the present time. Thus our model fairly alleviates the cosmic-coincidence problem, which demands ω=−1 at the present time.

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Authors and Affiliations

  1. Center for Advanced Mathematics and Physics, National University of Sciences and Technology, Peshawar Road, Rawalpindi, 46000, Pakistan

    Mubasher Jamil

  2. Department of Mathematics, Jadavpur University, Kolkata, 700032, India

    Farook Rahaman

  3. Department of Physics, Netaji Nagar College for Women, Regent Estate, Kolkata, 700092, India

    Mehedi Kalam

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  1. Mubasher Jamil
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  2. Farook Rahaman
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  3. Mehedi Kalam
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Correspondence to Mubasher Jamil.

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Jamil, M., Rahaman, F. & Kalam, M. Cosmic-coincidence problem and variable constants of physics. Eur. Phys. J. C 60, 149–156 (2009). https://doi.org/10.1140/epjc/s10052-009-0865-x

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  • DOI: https://doi.org/10.1140/epjc/s10052-009-0865-x

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