Models of Interacting Dark Energy

TL;DR

This paper reviews recent models where interactions between dark matter and dark energy significantly influence the universe's evolution, potentially explaining accelerated expansion and addressing the coincidence problem.

Contribution

It provides a comprehensive overview of recent approaches emphasizing the role of dark sector interactions in cosmological dynamics.

Findings

Dark sector interactions can drive accelerated expansion.

Couplings may solve the coincidence problem.

Recent models highlight the importance of dark matter-dark energy interactions.

Abstract

Any non-gravitational coupling between dark matter and dark energy modifies the cosmological dynamics. Interactions in the dark sector are considered to be relevant to address the coincidence problem. Moreover, in various models the observed accelerated expansion of the Universe is a pure interaction phenomenon. Here we review recent approaches in which a coupling between both dark components is crucial for the evolution of the Universe.