Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2007-08-07
Phys.Rev.D76:124026,2007
Physics
High Energy Physics
High Energy Physics - Theory
25 pages, 11 figures, revised version, accepted for publication in Phys. Rev. D
Scientific paper
10.1103/PhysRevD.76.124026
We investigate the effect of the bulk contents in the DGP braneworld on the evolution of the universe. We find that although the pure DGP model cannot accommodate the transition of the effective equation of state of dark energy, once the bulk matter T^5_5 is considered, the modified model can realize the w_{eff} crossing -1. However this transition of the equation of state cannot be realized by just considering bulk-brane energy exchange or the GB effect while the bulk matter contribution is not included. T^5_5 plays the major role in the modified DGP model to have the w crossing -1 behavior. We show that our model can describe the super-acceleration of our universe with the equation of state of the effective dark energy and the Hubble parameter in agreement with observations.
Abdalla Elcio
Lin Chi-Yong
Wang Bin
Yin Shaoyu
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