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Anisotropic universe with cosmic strings and bulk viscosity in a scalar-tensor theory of gravitation. (English) Zbl 1254.83038
Summary: A spatially homogeneous and anisotropic Bianchi type-I cosmological model is obtained in the scalar-tensor theory of gravitation proposed by D. Sáez and V. J. Ballester [“A simple coupling with cosmological implications”, Phys. Lett. A 113, No. 9, 467–470 (1986; doi:10.1016/0375-9601(86)90121-0)] when the source for the 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.
83D05Relativistic gravitational theories other than Einstein’s
83F05Relativistic cosmology
83C55Macroscopic interaction of the gravitational field with matter (general relativity)
83C15Closed form solutions of equations in general relativity
85A40Cosmology (astronomy and astrophysics)
83E30String and superstring theories
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