Superinflation and quintessence in the presence of an extra field

TL;DR

This paper explores how adding an extra field to a scalar field model affects cosmic evolution, revealing both similar and novel dynamical behaviors depending on parameter choices.

Contribution

It introduces an extended model with an extra field influencing scalar field dynamics in cosmology, highlighting new effects not seen in simpler models.

Findings

For some parameters, the dynamics resemble single scalar field models.

Other parameter choices lead to new dynamical phenomena.

The model's implications depend on specific parameter values.

Abstract

We discuss the implication of the introduction of an extra field to the dynamics of a scalar field conformally coupled to gravitation in a homogeneous isotropic spatially flat universe. We show that for some reasonable parameter values the dynamical effects are similar to those of our previous model with a single scalar field. Nevertheless for other parameter values new dynamical effects are obtained.