Cosmological consequences of a possible $\Lambda$-dark matter interaction

TL;DR

This paper explores a new class of cosmological models where dark matter interacts with a dynamic cosmological constant, leading to transient acceleration and future dark matter dominance, with observational constraints analyzed.

Contribution

It introduces a flexible interaction model between dark matter and $ abla$, allowing for transient acceleration and future dark matter dominance, unlike standard models.

Findings

Transient acceleration solutions found in the model.

Constraints on model parameters from SNe Ia, BAO, CMB, and $H_0$ data.

Potential future dark matter-dominated era predicted.

Abstract

We propose a general class of interacting models in which the interaction between the CDM component and $\Lambda$ is parameterized by an arbitrary function of the cosmic scale factor $\epsilon(a)$. Differently from other dynamical $\Lambda$ scenarios in which the final stage of cosmic expansion is a de Sitter phase, we find solutions of transient acceleration, in which the $\Lambda$-dark matter interaction will drive the Universe to a new dark matter-dominated era in the future. We investigate some cosmological consequences of this model and discuss some constraints on its parameters from current SNe Ia, BAO, CMB and $H_0$ data.