Bulk Viscous Cosmological Model with G and Lambda Variables Through Dimensional Analysis
نویسنده
چکیده
A model with flat FRW symmetries and G and Λ, variable is considered in such a way that the momentum-energy tensor that describes the model is characterized by a bulk viscosity parameter. For this tensor the conservation principle is taken into account. In this paper it is showed how to apply the dimensional method in order to solve the outlined equations in a trivial way. Keywords— Odes, AD, FRW Cosmologies, variable canstant
منابع مشابه
Bulk viscous string cosmological models in Saez – Ballester theory of gravitation
Spatially homogeneous Bianchi type-II, VIII and IX anisotropic, as well as isotropic cosmological models can be obtained in a scalar tensor theory of gravitation proposed by Saez and Ballester (1986) when the source for energy momentum tensor is a bulk viscous fluid containing one-dimensional cosmic strings. All the models obtained and presented here are expanding, non-rotating and accelerating...
متن کاملD ec 1 99 8 Cosmological models with bulk viscosity in presence of adiabatic matter creation and with G , c and Λ variables
Some properties of cosmological models with a time variying bulk viscous coefficient in the presence of adiabatic matter creation and G, c, Λ variables are investigated in the framework of flat FRW line element. We find trivially a set of solutions through Dimensional Analysis.
متن کاملBulk Viscous Bianchi Type VI0 Cosmological Model in the Self-creation Theory of Gravitation and in the General Theory of Relativity
In the second self-creation theory of gravitation and in the general theory of relativity, Bianchi type VI0 cosmological model in the presence of viscous fluid is studied. An exact solution of the field equations is given by considering the cosmological model yields a constant decelerations parameter q=constant and the coefficients of the metric are taken as A(t)=[c1t+c<su...
متن کاملA pr 1 99 9 Cosmological models with bulk viscosity in presence of adiabatic matter creation and with G , c and Λ variables
Some properties of cosmological models with a time variable bulk viscous coefficient in the presence of adiabatic matter creation and G, c, Λ variables are investigated in the framework of flat FRW line element. We trivially find a set of solutions through Dimensional Analysis. In all the studied cases it is found that the the behaviour of these ”constants” is inversely proportional to the cosm...
متن کاملStagnation-point flow of a viscous fluid towards a stretching surface with variable thickness and thermal radiation
In the present analysis, we study the boundary layer flow of an incompressible viscous fluid near the two-dimensional stagnation-point flow over a stretching surface. The effects of variable thickness and radiation are also taken into account and assumed that the sheet is non-flat. Using suitable transformations, the governing partial differential equations are first converted to ordin...
متن کامل