https://doi.org/10.1140/epjc/s10052-020-7730-3
Regular Article - Theoretical Physics
Cosmological evolution of two-scalar fields cosmology in the Jordan frame
1
Instituto de Ciencias Físicas y Matemáticas, Universidad Austral de Chile, Valdivia, Chile
2
Departamento de Matemáticas, Universidad Católica del Norte, Avda. Angamos 0610, Casilla 1280, Antofagasta, Chile
3
Institute of Systems Science, Durban University of Technology, PO Box 1334, Durban, 4000, RSA
4
Department of Mathematics, Presidency University, 86/1 College Street, Kolkata, 700073, India
* e-mail: anpaliat@phys.uoa.gr
Received:
8
January
2020
Accepted:
6
February
2020
Published online:
28
February
2020
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.
© The Author(s), 2020