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Advances in High Energy Physics
Volume 2013 (2013), Article ID 609807, 5 pages
http://dx.doi.org/10.1155/2013/609807
Research Article

Anisotropic Bulk Viscous String Cosmological Model in a Scalar-Tensor Theory of Gravitation

1Department of Engineering Mathematics, MVGR College of Engineering, Vizianagaram 535001, India
2Miracle Educational Society Group of Institutions, Vizianagaram 535001, India
3Department of Mathematics, JNTU College of Engineering, Anantapur 515002, India

Received 28 August 2013; Accepted 15 October 2013

Academic Editor: Jose Edgar Madriz Aguilar

Copyright © 2013 D. R. K. Reddy et al. 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

Spatially homogeneous, anisotropic, and tilted Bianchi type- model is investigated in a new 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. Exact solution of the highly nonlinear field equations is obtained using the following plausible physical conditions: (i) scalar expansion of the space-time which is proportional to the shear scalar, (ii) the barotropic equations of state for pressure and energy density, and (iii) a special law of variation for Hubble’s parameter proposed by Berman (1983). Some physical and kinematical properties of the model are also discussed.