Crossing the Phantom Divide in Extended Dvali-Gabadadze-Porrati Gravity
  We propose a phantom crossing Dvali--Gabadadze--Porrati (DGP) model. In our
model, the effective equation of state of the DGP gravity crosses the phantom
divide line. We demonstrate crossing of the phantom divide does not occur
within the framework of the original DGP model or the DGP model developed by
Dvali and Turner. By extending their model, we construct a model that realizes
crossing of the phantom divide. We find that the smaller the value of the new
introduced parameter $\beta$ is, the older epoch crossing of the phantom divide
occurs in. Our model can account for late-time acceleration of the universe
without dark energy. We investigate and show the property of Phantom crossing
DGP model.
