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ISRN Mathematical Physics
Volume 2013 (2013), Article ID 759274, 5 pages
http://dx.doi.org/10.1155/2013/759274
Research Article

Kantowski-Sachs String Cosmological Model with Bulk Viscosity in General Scalar Tensor Theory of Gravitation

Department of Applied Mathematics, Andhra University, Visakhapatnam, Andhra Pradish 530003, India

Received 8 April 2013; Accepted 8 May 2013

Academic Editors: N. E. Bjerrum-Bohr, P. Hogan, and M. Znojil

Copyright © 2013 V. U. M. Rao and D. Neelima. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A new class of spatially homogeneous Kantowski-Sachs string cosmological models with bulk viscosity in Nordtvedt (1970) general scalar-tensor theory of gravitation with the help of a special case proposed by Schwinger (1970) is obtained. In this paper we have presented anisotropic as well as isotropic cosmological models. Some important features of the models, thus obtained, have been discussed. These exact models are new and more general and represent not only the early stages of evolution but also the present universe.