Double Scalar-Tensor Gravity Cosmologies

Details Double Scalar-Tensor Gravity Cosmologies Double Scalar-Tensor Gravity Cosmologies

2000-03-13

arxiv.org/abs/gr-qc/0003048v1

Grav.Cosmol. 6 (2000) 164-172

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

LaTex file, 18 pages, no figures, 2 tables, to appear in Grav. & Cosm

Scientific paper

We investigate homogeneous and isotropic cosmological models in scalar-tensor theories of gravity where two scalar fields are nonminimally coupled to the geometry. Exact solutions are found, by Noether symmetries, depending on the form of couplings and self-interaction potentials. An interesting feature is that we deal with the Brans-Dicke field and the inflaton on the same ground since both are nonminimally coupled and not distinguished {\it a priori} as in earlier models. This fact allows to improve dynamics to get successful extended inflationary scenarios. Double inflationary solutions are also discussed.

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