Extended Phase Space Analysis of Interacting Dark Energy Models in Loop Quantum Cosmology

TL;DR

This paper investigates the dynamics of interacting dark energy models within Loop Quantum Cosmology, revealing novel behaviors like singularity avoidance and transitions between different cosmic phases through phase space analysis.

Contribution

It introduces a comprehensive phase space analysis of interacting dark energy models with various potentials in Loop Quantum Cosmology, highlighting new cosmological phenomena.

Findings

Avoidance of big rip singularities due to quantum effects

Transitions from matter to dark energy domination

Finite periods of phantom domination with crossing of the phantom barrier

Abstract

The present work deals with the dynamical system investigation of interacting dark energy models (quintessence and phantom) in the framework of Loop Quantum Cosmology by taking into account a broad class of self-interacting scalar field potentials. The main reason for studying potentials beyond the exponential type is to obtain additional critical points which can yield more interesting cosmological solutions. The stability of critical points and the asymptotic behavior of the phase space are analyzed using dynamical system tools and numerical techniques. We study two class of interacting dark energy models and consider two specific potentials as examples: the hyperbolic potential and the inverse power-law potential. We found a rich and interesting phenomenology including the avoidance of big rip singularities due to loop quantum effects, smooth and non-linear transitions from matter domination to dark energy domination and finite periods of phantom domination with dynamical crossing of the phantom barrier.