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Bianchi Type-IX viscous fluid cosmological model in general relativity
Raj Bali,Mahesh Kumar Yadav +1 more
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In this article, a deterministic Bianchi Type-IX viscous fluid cosmological model is investigated and the physical and geometrical aspects of the model are also discussed.Abstract:
Bianchi Type-IX viscous fluid cosmological model is investigated. To get a deterministic model, we have assumed the conditiona = b
m(m is a constant) between metric potentials andη ∞θ whereη is the coefficient of shear viscosity andθ the scalar of expansion in the model. The coefficient of bulk viscosity (ς) is taken as constant. The physical and geometrical aspects of the model are also discussed.read more
Citations
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Exact Bianchi type II, VIII and IX string cosmological models in Saez-Ballester theory of gravitation
TL;DR: In this article, exact Bianchi type II, VIII and IX string cosmological models were obtained in the Saez-Ballester theory of gravitation and some physical and geometrical properties of the models were studied.
Journal ArticleDOI
Exact Bianchi type-II, VIII and IX perfect fluid cosmological models in Saez-Ballester theory of gravitation
TL;DR: In this article, exact Bianchi type-II, VIII and IX cosmological models are obtained in a scalar tensor theory proposed by Saez and Ballester (Phys. Lett. A 113:467, 1986).
Journal ArticleDOI
Bianchi Type III Bulk Viscous Barotropic Fluid Cosmological Models with Variable G and Λ
Raj Bali,Seema Tinker +1 more
TL;DR: In this article, the Bianchi type-V bulk viscous barotropic fluid cosmological model with variable gravitational constant G and the Cosmological constant A, assuming the condition on metric potential as, where A, B, and C are functions of time t, while m and n are constants.
Journal ArticleDOI
Bianchi type-IX cosmic strings in a scalar-tensor theory of gravitation
D. R. K. Reddy,R. L. Naidu +1 more
TL;DR: Bianchi type-IX space-time is considered in the presence of cosmic string source in the frame work of a scalar tensor theory of gravitation proposed by Saez and Ballester.
Journal ArticleDOI
Exact Bianchi type II, VIII and IX string cosmological models in General Relativity and self-creation theory of gravitation
TL;DR: Exact Bianchi type II, VIII and IX string cosmological models are obtained in Einstein's theory of gravitation and Barber's (1982) second self-creation theory as mentioned in this paper.
References
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The Isotropy of the universe
TL;DR: Einstein equations with flat homogeneous hypersurfaces including effects of viscosity in radiation and anisotropic pressures were studied in this paper, where the authors considered flat hypersurface models with flat surfaces.
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Entropy generation and the survival of protogalaxies in an expanding universe
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Transport Processes in the Primordial Fireball
TL;DR: Possible initial perturbations development into galaxies with dissipative effects associated with transport processes treated via Boltzmann equation is discussed in this article, where the authors consider the case where the initial perturbs are assumed to be Gaussian.
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Bianchi type I cosmological model with a viscous fluid
TL;DR: In this article, Bianchi I cosmological models consisting of a fluid with both bulk and shear viscosity are studied and it is shown how the dynamical importance of the shear and the fluid density change in the course of evolution.
Journal ArticleDOI
Some viscous fluid cosmological models of plane symmetry
TL;DR: In this article, two plane-symmetric cosmological models representing viscous fluid with free gravitational field of type D have been obtained and the effect of viscosity on various kinematical parameters has been discussed.
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