Interacting Dark Energy and Cosmological Equations of State

TL;DR

This paper explores how interactions in the cosmic medium, particularly involving dark energy, influence the universe's background evolution and the behavior of cosmic perturbations.

Contribution

It analyzes the effects of interacting dark energy models on both the homogeneous background and perturbation dynamics, providing new insights into their cosmological implications.

Findings

Interactions alter the equation of state of dark energy.

Implications for cosmic structure formation are discussed.

Modifications to standard cosmological models are proposed.

Abstract

Interactions within the cosmic medium modify its equation of state. We discuss implications of interacting dark energy models both for the spatially homogenous background and for the perturbation dynamics.