# Cosmological perturbations and dynamical analysis for interacting quintessence

## TL;DR

This paper analyzes the dynamics of interacting quintessence models with linear cosmological perturbations, identifying stable critical points that describe the transition between cosmological eras and serve as late-time attractors.

## Contribution

It extends previous background analyses by incorporating matter perturbations, providing a comprehensive dynamical analysis of interacting quintessence.

## Key findings

- Viable critical points for cosmological era transitions identified
- Stable late-time attractors confirmed for coupled and uncoupled cases
- Matter perturbations improve the understanding of background dynamics

## Abstract

We present the dynamical analysis for interacting quintessence, considering linear cosmological perturbations. Matter perturbations improve the background analysis and viable critical points describing the transition of the three cosmological eras are found. The stability of those fixed points are similar to previous studies in the literature, for both coupled and uncoupled cases, leading to a late-time attractor.