Viscous Fluid Cosmology in Bianchi Type-I Space-Time |
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Authors: | C P Singh and Suresh Kumar |
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Institution: | (1) Department of Applied Mathematics, Delhi College of Engineering, Bawana Road, Delhi, 110 042, India |
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Abstract: | The paper presents a spatially homogeneous and anisotropic Bianchi type-I cosmological model consisting of a dissipative fluid.
The field equations are solved explicitly by using a law of variation for mean Hubble parameter, which is related to average
scale factor and yields a constant value for deceleration parameter. We find that the constant value of deceleration parameter
describes the different phases of the evolution of universe. A barotropic equation of state (p=γ
ρ) together with a linear relation between shear viscosity and expansion scalar, is assumed. It is found that the viscosity
plays a key role in the process of the isotropization of the universe. The presence of viscous term does not change the fundamental
nature of initial singularity. The thermodynamical properties of the solutions are studied and the entropy distribution is
also given explicitly. |
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Keywords: | Hubble parameter Deceleration parameter Cosmological models Viscous fluid |
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