Bulk-Brane Interaction and Holographic Dark Energy

TL;DR

This paper investigates how bulk-brane interactions influence the equation of state of holographic dark energy in a non-flat universe, revealing constraints on the dark energy's behavior and its inability to produce phantom-like states.

Contribution

It introduces a model of holographic dark energy with bulk-brane interactions in a non-flat universe and derives the resulting equation of state, highlighting the effects of energy exchange.

Findings

The effective equation of state lower bound is -0.9.

Phantom-like dark energy states cannot be generated in this model.

The model accounts for non-conservation of holographic dark energy due to brane-bulk energy exchange.

Abstract

In this paper we consider the bulk-brane interaction to obtain the equation of state for the holographic energy density in non-flat universe enclosed by the event horizon measured from the sphere of horizon named $L$. We assumes that the cold dark matter energy density on the brane is conserved, but the holographic dark energy density on the brane is not conserved due to brane-bulk energy exchange. Our calculation show, taking $\Omega_{\Lambda}=0.73$ for the present time, the lower bound of $w_{\rm \Lambda}^{eff}$ is -0.9. This implies that one can not generate phantom-like equation of state from an interacting holographic dark energy model in non-flat universe.