How a brane cosmological constant can trick us into thinking that w<-1

@article{Lue2004HowAB,
  title={How a brane cosmological constant can trick us into thinking that w<-1},
  author={Arthur Lue and Glenn D Starkman},
  journal={Physical Review D},
  year={2004},
  volume={70},
  pages={101501}
}
Observations exploring the contemporary cosmic acceleration have sparked interest in dark energy models possessing equations of state with $wl\ensuremath{-}1$. We review how the cosmic expansion history of a Dvali-Gabadadze-Porrati (DGP) braneworld model with a standard brane cosmological constant can mimic that of ordinary 4D gravity with $wl\ensuremath{-}1$ ``phantom'' dark energy for observationally relevant redshifts. We reinterpret the effective phantom nature of the dark energy as arising… 

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