Constraints to Holographic Dark Energy Model via Type Ia Supernovae, Baryon Acoustic Oscillation and WMAP

TL;DR

This study tests the holographic dark energy model against observational data including supernovae, BAO, and WMAP, finding that current data disfavor the model and suggest a phantom-like future universe.

Contribution

The paper constrains the holographic dark energy model parameters using multiple observational data sets and Markov Chain Monte Carlo analysis, revealing tensions with theoretical energy conditions.

Findings

Best-fit parameter c = 0.696 with uncertainties

Future universe likely dominated by phantom dark energy

Current data disfavor the holographic dark energy model

Abstract

In this paper, the holographic dark energy (HDE) model, where the future event horizon is taken as an IR cut-off, is confronted by using currently available cosmic observational data sets which include type Ia supernovae, baryon acoustic oscillation and cosmic microwave background radiation from full information of WMAP-7yr. Via the Markov Chain Monte Carlo method, we obtain the values of model parameter $c= 0.696_{- 0.0737- 0.132- 0.190}^{+ 0.0736+ 0.159+ 0.264}$ with $1,2,3\sigma$ regions. Therefore one can conclude that at lest $3\sigma$ level the future Universe will be dominated by phantom like dark energy. It is not consistent with positive energy condition, however this condition must be satisfied to derive the holographic bound. It implies that the current cosmic observational data points disfavor the HDE model.