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

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

2004-08-12

arxiv.org/abs/astro-ph/0408246v2

Phys.Rev.D70:101501,2004

Astronomy and Astrophysics

Astrophysics

9 pages, 1 figure. References added

Scientific paper

10.1103/PhysRevD.70.101501

Observations exploring the contemporary cosmic acceleration have sparked interest in dark energy models possessing equations of state with w < -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 4-dimensional gravity with w < -1 "phantom" dark energy for observationally relevant redshifts. We reinterpret the effective phantom nature of the dark energy as arising from dynamical-screening of the brane cosmological constant in DGP. This unusual variety of expansion history is thus possible without violating the null-energy condition, without ghosts and without any big rip, in a model which seems no more contrived than most evolving dark energy models. We indicate ways by which one may observationally test this effective w < -1 possibility, and differentiate it from ``ordinary'' phantom dark-energy.

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