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

Abstract

Hypersurface-homogeneous cosmological models containing a bulk viscous fluid with time varying G and Λ have been presented. We have shown that the field equations are solvable for any arbitrary cosmic scale function. The viscosity coefficient of bulk viscous fluid is assumed to be a power function of the energy density. Exact solutions of Einstein's field equations are obtained which represent an expanding, shearing and accelerating/decelerating models of the universe. The physical and kinematical behaviours of the models are also discussed. © 2010 Springer Science+Business Media B.V.