Bulk viscous string cosmological models in Saez – Ballester theory of gravitation

Abstract

Spatially homogeneous Bianchi type-II, VIII and IX anisotropic, as well as isotropic cosmological models can be obtained in a scalar tensor theory of gravitation proposed by Saez and Ballester (1986) when the source for energy momentum tensor is a bulk viscous fluid containing one-dimensional cosmic strings. 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.

Keywords

• Bianchi type - II
• VIII and IX metrics
• Bulk viscosity
• Cosmic strings
• Saez – Ballester theory