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Paper detail

Cosmological Evolution of Two-Scalar fields Cosmology in the Jordan frame

In the present article we study the cosmological evolution of a two-scalar field gravitational theory defined in the Jordan frame. Specifically, we assume one of the scalar fields to be minimally coupled to gravity, while the second field which is the Brans-Dicke scalar field is nonminimally coupled to gravity and also coupled to the other scalar field. In the Einstein frame this theory reduces to a two-scalar field theory where the two fields can interact only in the potential term, which means that the quintom theory is recovered. The cosmological evolution is studied by analyzing the equilibrium points of the field equations in the Jordan frame. We find that the theory can describe the cosmological evolution in large scales, while inflationary solutions are also provided.

preprint2020arXivOpen access
Alex GiacominiGenly LeonAndronikos PaliathanasisSupriya Pan
astro-ph.COhep-phgr-qc
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Alex GiacominiGenly LeonAndronikos PaliathanasisSupriya Pan

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