Abstract
A Cosmological model with a viscous fluid in Kaluza-Klein metric is obtained assuming a time-dependent equation of state. The solution is in fact a generalization of an earlier work by Hajj and Boutros for a perfect fluid. It is also found that dimensional reduction of the extra space takes place such that the five-dimensional universe naturally evolves into an effective four-dimensional one. The dynamical behavior of the model is examined and it is also found that with a decrease in extra space the observable 3D space entropy increases thus accounting for the large value of entropy observable at present.
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Rahaman, F., Bhui, B.C. & Bhui, B. Cosmological Model with a Viscous Fluid in a Kaluza-Klein Metric. Astrophys Space Sci 301, 47–49 (2006). https://doi.org/10.1007/s10509-006-6304-7
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DOI: https://doi.org/10.1007/s10509-006-6304-7