Cosmological dynamics of a non-minimally coupled bulk scalar field in DGP setup

Authors :: Kourosh Nozari
Narges Rashidi
Publication Year :: 2013
Publisher :: arXiv, 2013.
Abstract: We consider cosmological dynamics of a canonical bulk scalar field, which is coupled non-minimally to 5-dimensional Ricci scalar in a DGP setup. We show that presence of this non-minimally coupled bulk scalar field affects the jump conditions of the original DGP model significantly. Within a superpotential approach, we perform some numerical analysis of the model parameter space and consider bulk-brane energy exchange in this setup. Also we show that the normal, ghost-free branch of the DGP solutions in this case has the potential to realize a self-consistent phantom-like behavior and therefore explains late time acceleration of the universe in a consistent way.<br />Comment: 25 pages, Accepted for publication in Astrophyics and Space Science