Viscous Fluid Cosmological Model in (2+1) Dimensional Space-Time

G. R. Avachar¹

Section:Research Paper, Product Type: Isroset-Journal
Vol.6 , Issue.4 , pp.69-72, Aug-2018

CrossRef-DOI:   https://doi.org/10.26438/ijsrpas/v6i4.6972

Online published on Aug 31, 2018

Copyright © G. R. Avachar . This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
 

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Abstract :
The viscosity fluid cosmological model in (2+1) dimensional Robertson-Walker space-time, when the source for energy momentum tensor is bulk viscous fluid has been investigated using the special law of variation for Hubble’s parameter proposed by Berman and the bar tropic equation of state. The physical and kinematical parameters of the model are discussed. The model is expanding with time since q+1>0. The model has no initial singularity at t=0. It is observed that, the Hubble parameterH, expansion scalar θ, matter density ρ and pressure p decreases with time and approach zero as t→∞ and all diverges at t=0. Also shear scalar σ and anisotropic parameter A_m vanishes, which indicates that shape of the universe remains unchanged during the evolution and universe becomes isotropic and shear free. It is observed that the model is expanding, nonsingular and non-rotating. It is also observed that model remains isotropic throughout the evolution and the bulk viscosity in the model decreases with time leading to inflationary model.

Key-Words / Index Term :
Cosmology, (2+1) dimension spce-time, viscous fluid

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