Isotropization of generalized scalar-tensor theory plus a massive scalar field in the Bianchi type I model

In this paper we study the isotropization of a generalized scalar-tensor theory with a massive scalar field. We find it depends on a condition on the Brans-Dicke coupling function and the potential, and show that asymptotically the metric functions always tend toward a power or exponential law of the proper time. These results generalize and unify those of de Sitter in the case of a cosmological constant and of Cooley and Kitada in the case of an exponential potential.