Dynamics of two-scalar-field cosmological models beyond the exponential potential

TL;DR

This paper explores the complex dynamics of two-scalar-field cosmological models beyond exponential potentials, identifying late-time attractors and conditions for multiple attractors that could explain universe evolution from scaling to acceleration.

Contribution

It introduces new insights into the late-time behavior and attractor structure of two-scalar-field models beyond exponential potentials, including conditions for multiple attractors.

Findings

Existence of late-time attractors with one scalar dominating

Identification of conditions for multiple attractors

Potential to model universe evolution from scaling to acceleration

Abstract

In this paper, we discuss the dynamics of two- scalar-field cosmological models. Unlike in the situation of exponential potential, we find that there are late-time attractors in which one scalar field dominates the energy density of universe and the other one decay. We also discuss the possibility of multiple attractors model which is useful to realize the evolution of the universe from a scaling era to recent acceleration era. We also give the conditions of the existence of multiple attractors.