Cosmological evolution of quintessence with a sign-changing interaction in dark sector

TL;DR

This paper investigates a cosmological model where dark sector interaction changes sign over time, revealing a scaling attractor that could address the cosmic coincidence problem and introduce new cosmological features.

Contribution

It introduces a novel sign-changing interaction in dark sector dynamics and demonstrates its role in producing a scaling attractor, offering new insights into cosmic evolution.

Findings

Identification of a scaling attractor in the dynamical system

Interaction change of sign during evolution

Potential alleviation of the cosmic coincidence problem

Abstract

By analysing the cosmological dynamical system with a dark-sector interaction which changes sign during the cosmological evolution, we find a scaling attractor to help to alleviate the cosmic-coincidence problem. This result shows that this interaction can bring new features to the cosmology.