Abstract
Cosmological models with time varying gravitational constant G and cosmological constant Λ in the presence of viscous fluid in Kaluza-Klein metric were investigated. The solutions to Einstein Field Equation were obtained for different types of G, with bulk coefficient ξ = ξ 0 ρ d (where ρ is density of the Universe, d is some constant) and lambda Λ = α H 2 + β R −2 where H and R are Hubble parameter and scale factor respectively. Two possible models are suggested, one where G is proportional to H and, the other where G is inversely proportional to H. While the former leads to a non-singular model, the latter results in an inflationary model. Both Cosmological models show that the Universe is accelerating; but at the early stage of the Universe the behaviour of both models is quite different,which has been studied through the variation of decelerating parameter q with time.
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Acknowledgments
We are highly thankful to Dr. Farook Rahaman, Jadavpur University and Dr. Saibal Ray, Government College of Engineering & Ceramic Technology for providing their views and suggestions for substantial improvement of this paper.
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Jain, N.I., Bhoga, S.S. Kaluza-Klein Bulk Viscous Cosmological Model with Time Dependent Gravitational Constant and Cosmological Constant. Int J Theor Phys 54, 2991–3003 (2015). https://doi.org/10.1007/s10773-015-2538-x
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DOI: https://doi.org/10.1007/s10773-015-2538-x