Some magnetized bulk viscous string cosmological models in General Relativity

Some Bianchi type-I viscous fluid string cosmological models with magnetic field are investigated. The viscosity coefficient of bulk viscous fluid is assumed to be a power function of mass density ξ(t)=ξ0ρm, where ξ0 and m are constants. To get a determinate model, we assume conditions ρ=(1+ω)λ, where ρ is rest energy density, ω a positive constant and λ the string tension density and expansion θ is proportional to eigen value σ11 of the shear tensor σji. The behaviour of the models from physical and geometrical aspects in presence and absence of magnetic field is discussed.