Effects of the interaction between dark energy and dark matter on cosmological parameters

TL;DR

This paper investigates how interactions between dark energy and dark matter influence cosmological parameters and addresses the coincidence problem using observational data and simple dark energy models.

Contribution

It introduces a joint analysis of phenomenological dark energy-dark matter interactions with observational data to evaluate their effects on cosmological parameters.

Findings

Interactions can potentially solve the coincidence problem.

Dark energy models with interactions fit observational data well.

Constraints on interaction strength are derived from data.

Abstract

We examine the effects of possible phenomenological interactions between dark energy and dark matter on cosmological parameters and their efficiency in solving the coincidence problem. We work with two simple parameterizations of the dynamical dark energy equation of state and the constant dark energy equation of state. Using observational data coming from the new 182 Gold type Ia supernova samples, the shift parameter of the Cosmic Microwave Background given by the three-year Wilkinson Microwave Anisotropy Probe observations, and the baryon acoustic oscillation measurement from the Sloan Digital Sky Survey, we perform a statistical joint analysis of different forms of phenomenological interactions between dark energy and dark matter.