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A Non-Singular Universe with Vacuum Energy

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Abstract

A model for the universe based on the back-reaction effects of quantum fields at finite temperature in the background of Robertson-Walker spacetime and in the presence of a non-zero cosmological constant is constructed. We discuss the vacuum regime in the light of the results obtained through previous studies of the back-reaction of massless quantum fields in the static Einstein universe, and we argue that an adiabatic vacuum state and thermal equilibrium is achieved throughout this regime. Critical density is maintained naturally from the very early stages as a consequence of back-reaction effect of the vacuum fluctuations of quantum fields. Results show that such a model can explain many features of the early universe as well as the present universe. The model is free from the basic problems of the standard Friedmann cosmology, and is non-singular but involves a continuous creation of energy at a rate proportional to the size of the universe, which is lower than that suggested by the steady-state cosmology.

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Authors and Affiliations

  1. Department of Physics, Yarmouk University, 21163, Irbid, Jordan

    M. B. Altaie

  2. Yarmouk University Model School, Irbid, Jordan

    Usama al-Ahmad

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  1. M. B. Altaie
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  2. Usama al-Ahmad
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Correspondence to M. B. Altaie.

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Altaie, M.B., al-Ahmad, U. A Non-Singular Universe with Vacuum Energy. Int J Theor Phys 50, 3521–3528 (2011). https://doi.org/10.1007/s10773-011-0860-5

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  • DOI: https://doi.org/10.1007/s10773-011-0860-5

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