Some cosmological models with scalar fields including source functions

Cosmological models have been constructed by adopting observed universe as homogeneous and isotropy at the global scale. However, in many study, matter has been assumed as a perfect fluid. But, some problems can not be exactly explained by these adoptions.In this study, exact solutions of Einstein?s field equations are obtained for Bianchi Type I, homogeneous but anisotropy and known as a Marder metric, filled with string fluid existing from cosmic string which occurred during the phase transition at the very early stages of the universe. Also, physical and asymptotic behavior of these solutions have been studied.In the obtained solutions, the energy-momentum tensor is used for the cosmic string fluid, 1-dimentional objects, as curvature source of the space-time.Keywords : Cosmic String, Marder's metric, Einstein?s Field Equations, Bianchi Type Models, Cosmic Microwave Background Anisotropy.