Bianchi-Type VI<sub>0</sub> Bulk Viscous Fluid Models with Variable Gravitational and Cosmological Constants

Abstract

This paper deals with Bianchi type VI 0 anisotropic cosmological models filled with a bulk viscous cosmic fluid in the presence of time-varying gravitational and cosmological constant. Physically realistic solutions of Einstein's field equations are obtained by assuming the conditions 1) the expansion scalar is proportional to shear scalar 2) the coefficient of the bulk viscosity is a power function of the energy density and 3) the cosmic fluid obeys the barotropic equation of state. We observe that the corresponding models retain the well established features of the standard cosmology and in addition, are in accordance with recent type Ia supernovae observations. Physical behaviours of the cosmological models are also discussed.

Inflationary Universe Scenario in Bianchi Type VI0 Space Time with Flat Potential and Bulk Viscosity in General Relativity

“…The introduction of viscosity in the cosmic fluid content, has been found very useful in explaining many significant physical aspects of the dynamics of homogeneous cosmological models as per investigations by many authors viz. Ribeiro and Sanyal [11], Patel and Koppar [12], Bali et al [13,14], Verma and Shri Ram [15] in Bianchi Type VI 0 models for viscous fluid distribution in different contexts.…”