On An Interacting New Holographic Dark Energy Model: observational constraints

TL;DR

This paper investigates an interacting holographic dark energy model within the DGP braneworld framework, analyzing its observational constraints and stability, and comparing it with the standard Lambda-CDM model.

Contribution

It introduces a detailed observational analysis of the interacting DGP holographic dark energy model, including stability and model comparison with current data.

Findings

The universe exhibits accelerated expansion in all interaction scenarios.

The model behaves like quintessence with phantom-like late-time behavior.

The model shows good stability according to squared sound speed analysis.

Abstract

In this paper, we study the interacting DGP braneworld Holographic Dark Energy model in a spatially flat FRW universe. Mainly, in this study we concentrate our attention on both interacting and non-interacting form of the model. The study shows that the equation of state and the deceleration parameter depict an accelerated universe for all variety of interactions. On the other hand, the StateFinder analysis shows that of the interacting and non-interacting behave similar to both quintessence and phantom dark energy and for the present value obey the behavior of quintessence. Moreover, the result of $Om$-diagnostic is an emphasis on the result of the equation of state showing that the current model is in the quintessence are with Phantom-like behavior in the late time. By the use of the squared sound speed $v^2_s$ we find that the present mode has a good stability. In order to obtain the best fit values of the parameters in this work we used the latest observational data (Pantheon, Boss DR12 and Planck 2015) implementing MCMC method by the use of EMCEE python package. We also employ Akaike Information Criterion (AIC) and Bayesian Information Criterion (BIC) model selection tools and compare the model with $\Lambda$CDM as the reference model.