An Emergent Universe with Dark Sector Fields in a Chiral Cosmological Model

TL;DR

This paper introduces a novel emergent universe model within a chiral cosmological framework featuring interacting dark sector fields, providing exact solutions and analyzing their evolution over cosmic time.

Contribution

It presents the first exact solution for a global emergent universe in a chiral cosmological model with interacting dark sector fields.

Findings

Derived an exact emergent universe solution from the infinite past to future.

Analyzed the evolution of kinetic and potential energies in the model.

Investigated the behavior of chiral metric components affecting scalar field interactions.

Abstract

We consider the emergent universe scenario supported by a chiral cosmological model with two interacting dark sector fields: phantom and canonical. We investigate the general properties of the evolution of the kinetic and potential energies as well as the development of the equation of state with time. We present three models based on asymptotic solutions and investigate the phantom part of the potential and chiral metric components. The exact solution corresponding to a global emergent universe scenario, starting from the infinite past and evolving to the infinite future, has been obtained for the first time for a chiral cosmological model. The behavior of the chiral metric components responsible for the kinetic interaction between the phantom and canonical scalar fields has been analyzed as well.