Modified holographic dark energy in DGP brane world

TL;DR

This paper investigates a modified holographic dark energy model within the DGP brane world, analyzing its impact on cosmic acceleration and the crossing of the phantom divide using different IR cutoffs.

Contribution

It introduces a new holographic dark energy model derived from higher-dimensional black hole mass considerations in the DGP framework, exploring its cosmological implications.

Findings

Modified HDE can drive late-time cosmic acceleration.

HDE with future event horizon can cross the phantom divide.

The model explains acceleration in both branches of DGP.

Abstract

In this paper, the cosmological dynamics of a modified holographic dark energy which is derived from the UV/IR duality by considering the black hole mass in higher dimensions as UV cutoff, is investigated in Dvali-Gabadaze-Porrati (DGP) brane world model. We choose Hubble horizon and future event horizon as IR cutoff respectively. And the two branches of the DGP model are both taken into account. When Hubble horizon is considered as IR cutoff, the modified holographic dark energy (HDE) behaves like an effect dark energy that modification of gravity in pure DGP brane world model acts and it can drive the expansion of the universe speed up at late time in $\epsilon=-1$ branch which in pure DGP model can not undergo an accelerating phase. When future event horizon acts as IR cutoff, the equation of state parameter of the modified HDE can cross the phantom divide.