Dynamics of interacting scalar field model in the realm of chiral cosmology

TL;DR

This paper explores the dynamics of an interacting two-scalar-field model within chiral cosmology, analyzing its stability and viability for explaining dark energy and dark matter interactions through phase-space methods.

Contribution

It introduces a novel two-scalar-field interaction model in chiral cosmology and provides a detailed dynamical systems analysis of its cosmological implications.

Findings

Existence of a unique equivalence between fields and fluids descriptions.

Stable critical points indicating viable dark energy-dark matter interactions.

Cosmological viability confirmed for exponential potential form.

Abstract

The strange behaviour of the universe's dark sector offers us the flexibility to address cosmological problems with different approaches. Using this flexibility, we consider a possible exchange of energy among the dark sector components as a viable candidate model. In the present work, we investigate the interaction between two scalar fields within the generalization of a two-component chiral cosmology. We also show that there exists a unique equivalence between fields and fluids description of interacting dark sector model. Later, a detailed analysis of the dynamics of the dark energy-dark matter model with coupling in both kinetic and potential parts has been performed using a method of qualitative analysis of dynamical systems. Moreover, the cosmological viability of this model is analyzed for the potential of an exponential form via the phase-space study of autonomous system for various cosmological parameters.