Abstract
Some Bianchi type IX viscous fluid cosmological models are investigated. To get a solution, a supplementary condition between metric potentials is used. The viscosity coefficient of bulk viscous fluid is assumed to be a power function of mass density, whereas the coefficient of shear viscosity is considered as proportional to scale of expansion in the model. The cosmological constant Λ is found to be positive and is a decreasing function of time, which is supported by results from recent supernovae observations. Some physical and geometric properties of the models are also discussed.
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Pradhan, A., Srivastav, S.K. & Yadav, M.K. Some Homogeneous Bianchi type IX Viscous Fluid Cosmological Models with a Varying Λ. Astrophys Space Sci 298, 419–432 (2005). https://doi.org/10.1007/s10509-005-5832-x
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DOI: https://doi.org/10.1007/s10509-005-5832-x