Magnetized Kantowski-Sachs bulk viscous string cosmological models with decaying vacuum energy density Lambda (t)


Abstract: In this paper, we deal with bulk viscous magnetized Kantowski-Sachs string cosmological models in the presence of time variable cosmological term Lambda . To obtain a deterministic model, we assume the conditions sigma infty theta and zeta theta = constant, where sigma is the shear, theta the expansion in the model, and zeta the coefficient of bulk viscosity. The value of cosmological constant for the models is found to be small and positive, which is supported by the results from recent observations (SN 1a). The behavior of the model in the presence and absence of magnetic fields together with physical and geometrical aspects is also discussed.

Keywords: Kantowski-Sachs universe, bulk viscous, magnetized cosmic string, variable cosmological constant

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