Open AccessJournal Article
Double scalar tensor gravity cosmologies
TL;DR: In this paper, homogeneous and isotropic cosmological models in scalar-tensor theories of gravity where two scalar fields are nonminimally coupled to the geometry are investigated.
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Abstract: 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 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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