Crossing the phantom divide without phantom matter

Abstract

A class of braneworld models can lead to phantom-like acceleration of the late universe, but without the need for any phantom matter. In the simplest models, the universe contains only cold dark matter and a cosmological constant. We generalize these models by introducing a quintessence field. The new feature in our models is that quintessence leads to a crossing of the phantom divide, $w=-1$. This is a purely gravitational effect, and there is no phantom instability. Furthermore, the Hubble parameter is always decreasing, and there is no big rip singularity in the future.

5 pages, 5 figures, revtex4

References in corpus (3)

• Braneworld models of dark energy
• How a brane cosmological constant can trick us into thinking that w < -1
• Interacting Phantom Energy and Avoidance of the Big Rip Singularity

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