Holographic dark energy in the DGP model

TL;DR

This paper explores the effects of incorporating holographic dark energy into the DGP braneworld model, revealing accelerated expansion and phantom behavior, with specific singularities depending on curvature and model parameters.

Contribution

It introduces the analysis of holographic dark energy within the DGP model using the Hubble scale as IR cutoff, highlighting novel cosmological behaviors and singularities.

Findings

Accelerated flat universe in both DGP branches with holographic dark energy.

Dark energy exhibits phantom behavior in non-flat universes during the present era.

A sudden singularity occurs when the holographic parameter c equals one in closed universes.

Abstract

The braneworld model proposed by Dvali, Gabadadze and Porrati leads to an accelerated universe without cosmological constant or other form of dark energy. Nevertheless, we have investigated the consequences of this model when an holo- graphic dark energy is included, taken the Hubble scale as IR cutoff. We have found that the holographic dark energy leads to an accelerated universe flat (de Sitter like expansion) for the two branch: {\ko} = \pm1 of the DGP model. Nevertheless, in universes with no null curvature the dark energy presents an EoS corresponding to a phantom fluid during the present era and evolving to a de Sitter like phase for future cosmic time. In the special case in which the holographic parameter c is equal to one we have found a sudden singularity in closed universes. In this case the expansion is decelerating. Manuscript