Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2005-11-30
JCAP0603:006,2006
Physics
High Energy Physics
High Energy Physics - Theory
Revtex, 11 pages including 2 figures,v2: tpos fixed, references added, to appear in JCAP
Scientific paper
10.1088/1475-7516/2006/03/006
We consider a brane cosmological model with energy exchange between brane and bulk. Parameterizing the energy exchange term by the scale factor and Hubble parameter, we are able to exactly solve the modified Friedmann equation on the brane. In this model, the equation of state for the effective dark energy has a transition behavior changing from $w_{de}^{eff}>-1$ to $w_{de}^{eff}<-1$, while the equation of state for the dark energy on the brane has $w>-1$. Fitting data from type Ia supernova, Sloan Digital Sky Survey and Wilkinson Microwave Anisotropy Probe, our universe is predicted now in the state of super-acceleration with $w_{de0}^{eff}=-1.21$.
Cai Rong-Gen
Gong Yun-gui
Wang Bin
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