Interacting dark energy and transient accelerated expansion

TL;DR

This paper explores how interactions within dark energy can lead to a transient phase of accelerated cosmic expansion, potentially altering the future evolution of the universe compared to standard models.

Contribution

It introduces a two-fluid toy model demonstrating that dark sector interactions can cause transient acceleration, challenging the predictions of the LCDM model.

Findings

Dark sector interactions can induce transient acceleration.

Future cosmic evolution may differ from LCDM predictions.

Interaction-driven acceleration can be temporary.

Abstract

We argue that interactions in the dark sector may have a crucial impact on the cosmological dynamics. In particular, the future cosmic evolution may be very different from that predicted by the LCDM model. An example is a scenario in which the currently observed accelerated expansion is an interaction-induced transient phenomenon. We discuss such type of behavior on the basis of a two-fluid toy model.