Scalar-Tensor Bianchi VI Models

Abstract EN

We study how may vary the gravitational and the cosmological “constants,” (G and Λ) in several scalar-tensor theories with Bianchi III, VI0, and VIh symmetries.

By working under the hypothesis of self-similarity we find exact solutions for two different theoretical models, which are the Jordan-Brans-Dicke (JBD) with Λ(ϕ), and the usual JBD model with potential U(ϕ) (that mimics the behaviour of Λ(ϕ)).

We compare both theoretical models, and some physical and geometrical properties of the solutions are also discussed putting special emphasis on the study of the isotropization of the solutions.