Bianchi Type I Cosmological Models with Viscous Fluid & Decaying Vacuum

Abstract

Cosmological models with viscous media and time-dependent cosmological term Ù have been studied in the background of Bianchi type I space-time. We examine the cosmological scenario assuming expansion anisotropy s/q (the ratio of shear s to the volume expansionq) to be suitable function of spatial volume V. We obtain that models begin with decelerating expansion and enter into accelerating phase at late times. Initial anisotropy of the models dies out asymptotically.