Journal ArticleDOI
Isotropic homogeneous universe with viscous fluid
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In this paper, exact solutions for the isotropic homogeneous cosmological model with viscous fluid were obtained for a special case of this general set of solutions and it was shown that Murphy's conclusion that the introduction of bulk viscosity can avoid the occurrence of space-time singularity at finite past is not, in general, valid.Abstract:
Exact solutions are obtained for the isotropic homogeneous cosmological model with viscous fluid. The fluid has only bulk viscosity and the viscosity coefficient is taken to be a power function of the mass density. The equation of state assumed obeys a linear relation between mass density and pressure. The models satisfying Hawking’s energy conditions are discussed. Murphy’s model is only a special case of this general set of solutions and it is shown that Murphy’s conclusion that the introduciton of bulk viscosity can avoid the occurrence of space‐time singularity at finite past is not, in general, valid.read more
Citations
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Journal ArticleDOI
Viscous Inflationary Universe Models
TL;DR: In this article, the authors reviewed and carried further in inflationary cosmological models of Bianchi type-I with shear, bulk, and nonlinear viscosity.
Journal ArticleDOI
Early viscous universe with variable gravitational and cosmological ‘constants’
TL;DR: In this paper, a unified description of the early evolution of universe is presented with a number of possible assumptions on the bulk viscous term and cosmological constant in which an inflationary phase is followed by radiation-dominated phase.
Journal ArticleDOI
Bianchi type i magnetofluid cosmological models with variable cosmological constant revisited
Anirudh Pradhan,Sanjay Singh +1 more
TL;DR: In this article, the behavior of magnetic field in anisotropic Bianchi type I cosmological model for bulk viscous distribution is investigated and the physical and geometrical aspects of the models are also discussed in presence and also in absence of the magnetic field.
Journal ArticleDOI
Bulk Viscous FRW Cosmology in Lyra Geometry
TL;DR: In this article, an isotropic homogeneous FRW universe in the presence of a bulk viscous fluid within the framework of Lyra's geometry was studied and exact solutions of the Sen equations were obtained assuming the deceleration parameter to be constant.
Journal ArticleDOI
Some bianchi type i viscous fluid cosmological models with a variable cosmological constant
Anirudh Pradhan,Purnima Pandey +1 more
TL;DR: In this paper, Bianchi type I viscous fluid cosmological models with a variable cosmology constant are investigated in which the expansion is considered only in two direction i.e. one of the Hubble parameter is zero and the other is a decreasing function of time.
References
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Book
The Large Scale Structure of Space-Time
TL;DR: In this paper, the authors discuss the General Theory of Relativity in the large and discuss the significance of space-time curvature and the global properties of a number of exact solutions of Einstein's field equations.
Journal ArticleDOI
Big-Bang Model Without Singularities
TL;DR: In this paper, a uniform cosmological model with pressure and second viscosity is developed, which can be used to integrate the Einstein equations exactly, but this model is unstable.
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