Holographic Dark Energy: its Observational Constraints and Theoretical Features

TL;DR

This paper examines the observational signatures and theoretical features of holographic dark energy models, including interaction effects, and finds they are mildly favored over the standard cosmological model with implications for the universe's ultimate fate.

Contribution

It provides new observational constraints on holographic dark energy models, including interaction terms, and compares their viability to the standard Lambda CDM model using Bayesian evidence.

Findings

Models favor an equation of state crossing -1

Universe likely ends in a Big Rip

Holographic models are mildly favored over Lambda CDM

Abstract

We investigate the observational signatures of the holographic dark energy model in this paper, including both the original model and a model with an interaction term between the dark energy and dark matter. We first delineate the dynamical behavior of such models, especially whether they would have a "Big Rip" for different parameters, then we use several recent observational data to give more reliable and tighter constraints on the models. The results favor the equation of state of dark energy crossing -1, and the universe ends in the "Big Rip" phase. By using the Bayesian evidence as a model selection criterion to make the model comparison, we find that the holographic dark energy models are mildly favored by the observations compared with the $% \mathrm{\Lambda CDM}$ model.