Five-dimensional FRW String Cosmological Models with Bulk Viscosity in Brans-Dicke Theory of Gravitation

Abstract

This paper deals with spatially homogeneous anisotropic five dimensional FRW cosmological models in a scalar tensor theory of gravitation proposed by Brans and Dicke [1] when the source for energy momentum tensor is a bulk viscous fluid containing one dimensional cosmic string. To obtain a determinate solution of the field equations we have used a power law between scalar field and the scale factor of the universe.  All the models obtained and presented here are expanding, non-rotating and accelerating. Also some important features of the models, thus obtained, have been discussed.