Brane-Bulk energy exchange and agegraphic dark energy

TL;DR

This paper explores how energy exchange between a brane and bulk influences agegraphic dark energy, enabling the equation of state to transition into the phantom regime while maintaining an effective state above -1.

Contribution

It introduces a model where brane-bulk energy exchange affects the dark energy equation of state, allowing for a transition into the phantom regime.

Findings

The equation of state parameter $w_D$ can cross -1 due to brane-bulk interaction.

The effective equation of state $w^{ ext{eff}}_D$ remains above -1.

Energy exchange influences dark energy dynamics in braneworld scenarios.

Abstract

We consider the agegraphic models of dark energy in a braneworld scenario with brane-bulk energy exchange. We assume that the adiabatic equation for the dark matter is satisfied while it is violated for the agegraphic dark energy due to the energy exchange between the brane and the bulk. Our study shows that with the brane-bulk interaction, the equation of state parameter of agegraphic dark energy on the brane, $w_D$, can have a transition from normal state where $w_D >-1 $ to the phantom regime where $w_D <-1 $, while the effective equation of state for dark energy always satisfies $w^{\mathrm{eff}}_D\geq-1$.