28 Result(s)
within
T. Singh
English
Astrobiology
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Article
Bouncing cosmologies with viscous fluids
The bounce in viscous fluid cosmology with inhomogeneous viscous fluids in Friedman-Robertson-Walker (FRW) space-time has been investigated. Different forms for the scale factor have been considered. The gener...
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Article
General class of Bianchi cosmological models with Λ in creation-field cosmology
The solutions of Einstein’s equations with cosmological constant (Λ) in the presence of a creation field have been obtained for general class of anisotropic cosmological models. We have obtained the cosmological ...
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Article
Bianchi type-I, III, V, VIo and Kantowski-Sachs universes in creation-field cosmology
The solutions of Einstein’s equations in the presence of a creation field have been obtained for Bianchi type-I, III, V, VIo and Kantowski-Sachs (KS) universes in the quadrature form. Some physically interesti...
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Article
Bianchi type-V cosmological models with perfect fluid and dark energy
We consider a self-consistent system of Bianchi type-V cosmology and binary mixture of perfect fluid and dark energy. The perfect fluid is taken to be one obeying the usual equation of state p=γ ...
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Article
Bianchi type- I, III, V, VIo and Kantowski-Sachs models in scalar-tensor theories with dynamic cosmological constant
The effect of a time-dependent cosmological constant is considered in a family of scalar-tensor theories. The Bianchi type I, III, V, VIo and Kantowski-Sachs models for vacuum and perfect fluid matter are foun...
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Article
Viscous cosmological models with particle creation in Brans-Dicke theory
The effect of bulk viscosity on the evolution of the spatially flat Friedmann-Robertson-Walker models in the context of open thermodynamical systems, which allow particle creation, is analyzed within the frame...
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Article
Solutions of einstein's field equations for charged static fluid spheres
In this paper the authors have extended Bayin's (1978) work to the case of charged fluid spheres. These solutions are matched at the boundary with the Reissner-Nordström solution.
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Article
Bianchi type-II, VIII, and IX in certain new theories of gravitation
Bianchi type-II, VIII, and IX models have been investigated in scalar-tensor theories developed by Saez (1985), Saez and Ballester (1985), and Lau and Prokhovnik (1986) (under the assumption of a certain relat...
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Article
Bianchi type V and VI0 cosmological models in Lyra geometry
The Bianchi type V and VI0 models have been investigated in Lyra geometry in both the cases with the gauge function β is a time dependent and β=constant. The physical behaviour of these models has been discussed.
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Article
Some Bianchi-type cosmological models in a new scalar-tensor theory
Bianchi type I, III, V, VI0, and Kantowski-Sachs type models have been investigated in a scalar tensor theory developed by Saez and Ballester (1985) and Saez (1985). The dynamical behaviour of the models has also...
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Article
Bianchi type III and Kantowski-Sachs cosmological models in Lyra geometry
The cosmological models for Bianchi type III and Kantowski-Sachs space-time within the framework of Lyra geometry are obtained. The physical behaviour of the models have also been discussed.
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Article
Certain vacuum Bianchi-type models in a new relativistic theory of gravitation
The vacuum Bianchi type-I, III, V, VI0 and Kantowski-Sachs models have been obtained in a new scalar-tensor theory formulated by Lau and Prokhovnik (1986) under the assumption of a certain relationship between th...
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Article
Cylindrically-symmetric matter distribution with a magnetic field in Einstein-Cartan Theory
In the first part the number of independent non-vanishing components of the 3-index torsion tensorQ jk i ...
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Article
Liouville space-time in general projective relativity
Vacuum field equations of general projective relativity have been solved for Liouville space-time. Finally harmonic coordinate condition and singular behaviour of Kretschmann scalar for the solution is discussed.
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Article
Non-static cylindrically symmetric fields in general projective relativity
Exact solutions for the vacuum field equations of General Projective Relativity of Arcidiacono (1986) are obtained for the non-static Einstein-Rosen metric (Einstein and Rosen, 1937). The nature of singulariti...
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Article
Some anisotropic spatially-homogeneous cosmological models with electromagnetic field
Considering Bianchi type-I metric, cosmological models of a perfect fluid with an electromagnetic field have been obtained, using a supplementary condition between the metric potentials. The four-current is ei...
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Article
Product spaceV 2xV 2 and plane fronted waves in general projective relativity
In this paper the field equations of General Projective Relativity have been investigated in the product space ofV 2xV 2 space-time (Bertotti, 1959) and plane fronted metric of Peres (1959). It is shown that wave...
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Article
A note on some static scalar-gravitational fields
In this note extending the technique developed for static fields by De (1964) to the static plane-symmetric solution of Taub (1951) and the conformastat gravitational universe of Das (1971) solutions for coupl...
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Article
Newtonian analogue of force and motion of a free particle in the gravitational field of theC-metric
In the first part of the paper the Newtonian analogue of force for theC-metric has been investigated. To the first-order of approximation in the absence of acceleration of the particle generating theC-metric, one...
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Article
Newtonian analogue of force and motion of a free particle in the gravitational field of Kerr-de Sitter space-time
In the first part of the paper the Newtonian analogue of force for the Kerr-de Sitter metric has been investigated. To the first-order of approximation, a component of the force vector corresponds to the Newto...
