Bianchi Type I Bulk Viscous Fluid String Dust Cosmological Model with Magnetic Field in Bimetric Theory of Gravitation

In the presence of both magnetic field and bulk viscosity, Bianchi Type I bulk viscous fluid string dust cosmological model in Rosen's bimetric theory of gravitation have been investigated by using the technique of Letelier and Stachel. The nature of the model is discussed in the absence of both magnetic field and bulk viscosity. To get a determinate solution, we have assumed the condition that sigma is proportional to theta and zeta theta = constant where sigma is the shear, theta is the expansion in the model and zeta is the coefficient of bulk viscosity. Further the physical and geometrical significance of the model are discussed. Here, we compared between the case in the presence of magnetic field and bulk viscosity and the case in the absence of magnetic field and bulk viscosity.