Holographic dark energy in Brans-Dicke cosmology with Granda-Oliveros cut-off

TL;DR

This paper explores holographic dark energy within Brans-Dicke cosmology using the Granda-Oliveros cut-off, demonstrating easier phantom crossing and transition from normal to phantom states with exotic matter interactions.

Contribution

It introduces a novel analysis of holographic dark energy in Brans-Dicke gravity with the Granda-Oliveros cut-off, highlighting conditions for phantom crossing and the effects of exotic interactions.

Findings

Phantom crossing is more easily achieved in Brans-Dicke cosmology.

Exotic matter interactions facilitate the transition to the phantom regime.

Cosmological parameters show distinct evolution patterns under the model.

Abstract

Motivated by the recent works of one of us [1,2] we study the holographic dark energy in Brans-Dicke gravity with the Granda-Oliveros cut-off proposed recently in literature. We find out that when the present model is combined with Brans-Dicke field the transition from normal state where $w_D >-1 $ to the phantom regime where $w_D <-1 $ for the equation of state of dark energy can be more easily achieved for than when resort to the Einstein field equations is made. Furthermore, the phantom crossing is more easily achieved when the matter and the holographic dark energy undergo an exotic interaction. We also calculate some relevant cosmological parameters and their evolution.