Anisotropic cosmological models with bulk viscosity for variable G and Λ

Abstract

In this paper we have considered axially symmetric Bianchi-I, Kantowski Sachs and Bianchi-III space-time models with bulk viscosity, where the gravitational constant G and the cosmological term vary with time. In Einstein equations this variation in G and are taken in such a way as to preserve the energy momentum tensor. Solutions are obtained with the cosmological term varying inversely with square of time.

Bulk Viscous Anisotropic Cosmological Models with Generalized Chaplygin Gas with Time Varying Gravitational and Cosmological Constants

“…Variability of G is also supported by observational results coming up from Lunar Laser Ranging [18]. Anisotropic cosmological models with bulk viscosity, variable G and Λ have been investigated by Chakraborty and Roy [19]. Singh and Beesham [20] have discussed anisotropic Bianchi type V perfect fluid space-time with variable G and Λ .…”

Bulk viscous fluid hypersurface–homogeneous cosmological models with time varying G and Λ

“…Singh et al (2007b) have obtained solution of Einstein's Field equations with variable G and in the presence of a perfect fluid for Bianchi type-III universe. Chakraborty and Roy (2008) have derived cosmological model with bulk viscosity with time varying G and . Bali and Seema (2009) have presented bulk viscous fluid cosmological model Bianchi type-III with variable G and by assuming the power law forms of the scale factors.…”

Bianchi-I Space-time with Variable Gravitational and Cosmological “Constants”

“…The spatially homogeneous and anisotropic Bianchi-I space-time provides such a framework. In the literature Bianchi type-I cosmological models with variable G and have been studied by Singh and Agrawal [21], Beesham [22], Kalligas et al [23], Arbab [24,25], Beesham et al [26], Kilinc [27], Vishwakarma [28], Chakraborty and Roy [29], Singh et al [30][31][32], Tiwari [33] and Oli [20].…”