A new parameterized interacting holographic dark energy

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.

Automated summary

In this study, we propose a cosmological model based on the holographic principle that allows for an interaction between dark energy and dark matter to explain the accelerated expansion of the universe. By using redshift parameterizations, we obtain an analytical expression for the Hubble parameter and test it with observational data. Our findings not only support the validity of our proposed model, but also provide some insights into the coincidence problem and the Hubble tension in cosmology.