C-Field Barotropic Fluid Cosmological Models with Variable Bulk Viscosity & Gravitational Constant in FRW Spacetime

Abstract

Cosmological models with variable bulk viscosity and gravitational constant in Hoyle-Narlikar creation field cosmology are investigated. To find the deterministic models of the universe, we have assumed that G = Rⁿ and zq = constant where G is the gravitational constant, R the scale factor, n is a constant, z the coefficient of bulk viscosity and q the expansion in the model. The particular cases for n = -1,-2 are discussed to find the behaviour of the universe in terms of cosmic time t. The physical and geometrical aspects of the models related with the Astronomical observations are also discussed.