Current constraints on interacting holographic dark energy

TL;DR

This paper examines an interacting holographic dark energy model using current cosmological data, finding evidence for very weak or no interaction, and discusses the phantom crossing behavior.

Contribution

It provides an analysis of holographic dark energy with interaction using multiple observational datasets, highlighting the weak or absent coupling.

Findings

Observations favor very weak or no interaction in the HDE model.

Data supports the phantom crossing behavior in certain scenarios.

Current data constraints are consistent with noninteracting dark energy.

Abstract

Although there is mounting observational evidence that the cosmic expansion is undergoing a late-time acceleration, the physical mechanism behind such a phenomenon is yet unknown. In this paper, we investigate a holographic dark energy (HDE) model with interaction between the components of the dark sector in the light of current cosmological observations. We use both the new \emph{gold} sample of 182 type Ia supernovae (SNe Ia) and the 192 SNe Ia ESSENCE data, the baryon acoustic oscillation measurement from the Sloan Digital Sky Survey and the shift parameter from the three-year Wilkinson Microwave Anisotropy Probe data. In agreement with previous results, we show that these observations suggest a very weak coupling or even a noninteracting HDE. The phantom crossing behavior in the context of these scenarios is also briefly discussed.