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

• Main Authors: D. R. K. Reddy, Ch. Purnachandra Rao, T. Vidyasagar, R. Bhuvana Vijaya
• Format: Article
• Language: English
• Published: Hindawi Limited 2013-01-01
• Series: Advances in High Energy Physics
• Online Access: http://dx.doi.org/10.1155/2013/609807

Spatially homogeneous, anisotropic, and tilted Bianchi type-VI0 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.