Crossing the phantom divide in brane cosmology with curvature corrections and brane-bulk energy transfer

TL;DR

This paper explores a modified brane-world cosmology model with curvature corrections and energy transfer, demonstrating the potential to cross the phantom divide in dark energy without introducing new components, supported by supernova and BAO data.

Contribution

It introduces a brane-world model with curvature corrections and energy transfer that allows crossing the phantom divide without new dark energy components.

Findings

Model can cross the phantom divide with curvature corrections.

Gold dataset shows some tendency for crossing.

SNLS dataset mildly favors crossing when combined with BAO data.

Abstract

We consider the Randall-Sundrum brane-world model with bulk-brane energy transfer where the Einstein-Hilbert action is modified by curvature correction terms: a four-dimensional scalar curvature from induced gravity on the brane, and a five-dimensional Gauss-Bonnet curvature term. It is remarkable that these curvature terms will not change the dynamics of the brane universe at low energy. Parameterizing the energy transfer and taking the dark radiation term into account, we find that the phantom divide of the equation of state of effective dark energy could be crossed, without the need of any new dark energy components. Fitting the two most reliable and robust SNIa datasets, the 182 Gold dataset and the Supernova Legacy Survey (SNLS), our model indeed has a small tendency of phantom divide crossing for the Gold dataset, but not for the SNLS dataset. Furthermore, combining the recent detection of the SDSS baryon acoustic oscillations peak (BAO) with lower matter density parameter prior, we find that the SNLS dataset also mildly favors phantom divide crossing.