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 . To obtain a deterministic model, we assume the conditions 1 and = constant, where is the shear, the expansion in the model, and the coecient 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 elds together with physical