Research
Bounce Behaviour of Kantowski-Sach Cosmological Model in General Relativity
Kantowski-Sach cosmological model has obtained in the general theory of relativity. The source for energymomentum tensor is assumed a perfect fluid. The field equations have solved by using special form of the average scale factor ( ) β β − − = − + 1 1 2 0 0 1 R(t) t t t proposed by Cai et al. The physical properties and the bouncing behavior of the model are also discussed.
Kaluza-Klein Barotropic Cosmological Models with Varying Gravitational Constant G in Creation Field Theory of Gravitation
Kaluza Klein cosmological models with varying G in Hoyle Narlikar creation field theory of gravitation for barotropic fluid distribution have been investigated. The solution of the field equations have been obtained by assuming that G=Al, where A is a scale factor and l is a constant. The physical properties of the model are studied.
Some Dust Cosmological Models with Time Dependent I(t) in Creation Field Cosmology
We have studied the Hoyle-Narlikar’s Creation-field cosmology for LRS Bianchi type-II, LRS Bianchi type-VI0, Plane Symmetric and Kantowski-Sachs universes with time dependent cosmological constant Λ(t) , when the universe is filled with dust distribution. To get deterministic model of the universe, a relation between shear (σ ) and expansion (θ ) is assumed. The physical aspects of the models are also discussed.
Bianchi Type-IX Dark Energy Model in Sen-Dunn Scalar-Tensor Theory of Gravitation
Bianchi type-IX cosmological model with variable equation of state (EoS) parameter have been investigated in general scalar-tensor theory of gravitation proposed by Sen and Dunn (J. Math. Phys. 12:578, 1971) when universe is filled with Dark Energy. The field equations have been solved by considering the scale factors in two different forms (i) ()ltretR1= , where r and l are positive constants and (ii) ()()ntR1sinhξ=, where ξ and n are positive constants, which render time dependent deceleration parameter. The physical and geometrical properties of the models are also discussed.
