The Interaction Rate in Holographic Models of Dark Energy

TL;DR

This paper reconstructs the interaction rate of a holographic dark energy model using observational data, revealing its evolution over redshift and implications for the dark energy equation of state.

Contribution

It provides the first reconstruction of the interaction rate in a specific holographic dark energy model using multiple observational datasets.

Findings

Interaction rate increases with expansion in the past

Interaction rate decreases at recent times

Dark energy equation of state does not cross the phantom divide

Abstract

Observational data from supernovae type Ia, baryon acoustic oscillations, gas mass fraction in galaxy clusters, and the growth factor are used to reconstruct the the interaction rate of the holographic dark energy model recently proposed by Zimdahl and Pav\'{o}n [1] in the redshift interval $0 < z < 1.8$. It shows a reasonable behavior as it increases with expansion from a small or vanishing value in the far past and begins decreasing at recent times. This suggests that the equation of state parameter of dark energy does not cross the phantom divide line.