Bianchi Type-I Universe with Bulk Viscous Fluid

Abstract

Bianchi type I space-time with a bulk viscous fluid and time varying cosmological term Λ have been studied. The coefficient of bulk viscosity  is assumed to be a simple function of the average scale factor S. The Einstein field equations are obtained explicitly by assuming the law for variation of Hubble's parameter to be a function of average scale factor S. The models evolve with constant value of deceleration parameter. The physical and geometrical models of the universe has been discussed.