Cosmological models with dynamical lambda in scalar-tensor theories
Abstract
In the context of a family os scalar-tensor theories with a dynamical , that is a binomial on the scalar field, the cosmological equations are considered. A general barotropic state equation p=(γ-1), for a perfect fluid is used for the matter content of the Universe. Some Friedmann- Robertson-Walker exact solutions are found, they have scale factor wich shows exponential or power law dependence on time. For some models the singularity can be avoided. Cosmological parameters as m, , q0 and t0 are obtained and compared with observational data.
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