Some Bianchi Type I Viscous Fluid Cosmological Models with a Variable Cosmological Constant
نویسندگان
چکیده
منابع مشابه
Some Bianchi Type I Viscous Fluid Cosmological Models with a Variable Cosmological Constant
Some Bianchi type I viscous fluid cosmological models with a variable cosmological constant are investigated in which the expansion is considered only in two direction i.e. one of the Hubble parameter (H1 = A4 A ) is zero. The viscosity coefficient of bulk viscous fluid is assumed to be a power function of mass density whereas the coefficient of shear viscosity is considered as constant in firs...
متن کاملSome Bianchi Type I Cosmological Models of the Universe for Viscous Fluid Distribution in Lyra Geometry
Some Bianchi type I cosmological models of the universe with time dependent gauge function β for viscous fluid distribution within the framework of Lyra geometry are investigated in which the expansion is considered only in two dimensions i.e. one of the Hubble parameter (H1 = Ȧ A) is zero. To get the deterministic solutions of Einstein’s modified field equations, the viscosity coefficient of b...
متن کاملCausal Bulk Viscous LRS Bianchi I Models With Variable Gravitational and Cosmological “Constant”
In this paper we have investigated an LRS Bianchi I anisotropic cosmological model of the universe by taking time varying G and Λ in the presence of bulk viscous fluid source described by full causal non-equilibrium thermodynamics. We obtain a cosmological constant as a decreasing function of time and for m,n > 0, the value of cosmological “constant” for this model is found to be small and posi...
متن کاملAxially Symmetric Cosmological Models with Perfect Fluid and Cosmological Constant∗
In this paper we will study the qualitative behavior of three anisotropic and homogeneous models: Kantowski-Sachs, Bianchi I and Bianchi III universes, with pressureless and cosmological constant. We conclude stating that, this models undergo isotropisation, except for the KantowskiSachs model (Ωk0 > 0) with ΩΛ0 < ΩΛM and for the Bianchi III (Ωk0 < 0) with ΩΛ0 < ΩΛM . To appear in Proceedings o...
متن کاملCausal Bulk Viscous Lrs Bianch I Models with Variable Gravitational and Cosmological “constant”
In this paper we have investigated an LRS Bianchi I anisotropic cosmological model of the universe by taking time varying G and Λ in the presence of bulk viscous fluid source described by full causal non-equilibrium thermodynamics. We obtain a cosmological constant as a decreasing function of time and for m,n > 0, the value of cosmological “constant” for this model is found to be small and posi...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Astrophysics and Space Science
سال: 2006
ISSN: 0004-640X,1572-946X
DOI: 10.1007/s10509-006-0141-6