Quintessence with Coupled Scalar Fields

TL;DR

This paper explores a quintessence model with two coupled scalar fields, demonstrating solutions that lead to eternal or transient cosmic acceleration while satisfying observational and nucleosynthesis constraints.

Contribution

It introduces a coupled scalar field quintessence model with solutions for both eternal and transient acceleration consistent with current observations.

Findings

Model produces solutions with eternal and transient acceleration.

Cosmological parameters match observational bounds.

Energy density constraints from nucleosynthesis are satisfied.

Abstract

We discuss the dynamics of a quintessence model involving two coupled scalar fields. The model presents two types of solutions, namely solutions that correspond to eternal and transient acceleration of the universe. In both cases, we obtain values for the cosmological parameters that satisfy current observational bounds as well as the nucleosynthesis constraint on the quintessence energy density.