Abstract
The cosmological observation indicates that the effective equation of state parameter w eff varies with z: it changes from w eff > -1 to w eff < -1 at z~0.2. We investigate under which condition it exhibits such behaviors based on the five-dimensional braneworld scenario. It is possible in the model with or without an energy exchange between the four-dimensional universe and the fifth dimension. However the curves of w eff are quite different between the two cases.
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