Anisotropic universe with cosmic strings and bulk viscosity in a scalar–tensor theory of gravitation
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- Rao, V.U.M., Sree Devi Kumari, G. & Sireesha, K.V.S. Astrophys Space Sci (2011) 335: 635. doi:10.1007/s10509-011-0776-9
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A spatially homogeneous and anisotropic Bianchi type-I cosmological model is obtained in a scalar–tensor theory of gravitation proposed by Saez and Ballester (Phys. Lett. A 113:467, 1986) when the source for energy momentum tensor is a bulk viscous fluid containing one dimensional cosmic strings. Some physical and kinematical properties of the model are discussed. It is observed that the bulk viscosity has a greater role in getting an accelerated expansion of the universe in this theory.