A New Parameterized Interacting Holographic Dark Energy

TL;DR

This paper proposes a flexible holographic dark energy model with an interaction term, using redshift parameterizations, which explains late cosmic acceleration, addresses the coincidence problem, and offers insights into the Hubble tension.

Contribution

It introduces an agnostic, parameterized approach to interacting holographic dark energy, providing analytical solutions and testing against observational data.

Findings

Supports late accelerated expansion consistent with observations

Addresses the coincidence problem in cosmology

Provides potential insights into the Hubble tension

Abstract

We study a cosmological model based on the holographic principle that allows an interaction between dark energy and dark matter with a Hubble infrared cutoff. We adopt an agnostic point of view with respect to the form of the interaction between these dark components by using redshift parameterizations of the dark energy equation of state (DE EoS). Following this approach, we obtain an analytical expression of the Hubble parameter and we test it with four different parameterizations of the DE EoS using currently Pantheon supernovae, Cosmic Chronometers and Galaxy Clustering data sets. Our analyses show that the considered parameterizations on this agnostic proposal allow a late accelerated cosmic expansion in comparison to the results from previous works where specific forms of the interaction are employed but fail to explain this behaviour. Furthermore, we find that our proposal solves the so-called coincidence problem in Cosmology and in this direction shed some light on the problem of the Hubble tension.