Cosmological Models with Variable Deceleration Parameter in Lyra’s Manifold
نویسندگان
چکیده
FRW models of the universe have been studied in the cosmological theory based on Lyra’s manifold. A new class of exact solutions has been obtained by considering a time dependent displacement field for variable deceleration parameter from which three models of the universe are derived (i) exponential (ii) polynomial and (iii) sinusoidal form respectively. The behaviour of these models of the universe are also discussed. Finally some possibilities of further problems and their investigations have been pointed out.
منابع مشابه
Cosmological Models of Universe with Variable Deceleration Parameter in Lyra’s Manifold
FRW models of the universe have been studied in the cosmological theory based on Lyra’s manifold. A new class of exact solutions has been obtained by considering a time dependent displacement field for variable deceleration parameter from which three models of the universe are derived (i) exponential (ii) polynomial and (iii) sinusoidal form respectively. The behaviour of these models of the un...
متن کاملOn Bianchi Type Cosmological Models in Lyra’s Geometry
EYL [1] first try to unify gravitation and electromagnetism in single space-time geometry. He showed how one can introduce vector field in the Riemannian space time with an intrinsic geometric significance, but this theory was not accepted. Later Lyra’s [2] proposed a modification of Riemannian geometry by introducing a gauge function into the structureless manifold that bears close resemblance...
متن کاملar X iv : g r - qc / 0 30 70 38 v 1 9 J ul 2 00 3 Bulk Viscous cosmological models in Lyra geometry
We have investigated an LRS Bianchi Type I models with bulk viscosity in the cosmological theory based on Lyra’s geometry. A new class of exact solutions have been obtained by considering a time-dependent displacement field for a constant value of the deceleration parameter and viscosity coefficient of bulk viscous fluid is assumed to be a power function of mass density. The physical behaviour ...
متن کاملBianchi Type V Bulk Viscous Cosmological Models with Time Dependent Λ-Term
Spatially homogeneous and anisotropic Bianchi type V space-time with bulk viscous fluid source and time-dependent cosmological term are considered. Cosmological models have been obtained by assuming a variation law for the Hubble parameter which yields a constant value of deceleration parameter. Physical and kinematical parameters of the models are discussed. The models are found to be compatib...
متن کاملar X iv : g r - qc / 0 60 81 07 v 1 2 3 A ug 2 00 6 FRW UNIVERSE WITH VARIABLE G and Λ - TERMS
A new class of exact solutions of Einstein’s field equations with a perfect fluid source, variable gravitational coupling G and cosmological term Λ for FRW spacetime is obtained by considering variable deceleration parameter models for the universe. The nature of the variables G(t), Λ(t) and the energy density ρ(t) have been examined for three cases : (i) exponential (ii) polynomial and (iii) s...
متن کامل