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Crossing the phantom divide without phantom matter

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arxiv astro-ph/0605450 v1 pith:KLLLJ7F7 submitted 2006-05-18 astro-ph gr-qchep-th

classification astro-phgr-qchep-th
keywords phantommodelsmattercrossingdividequintessencethereuniverse
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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.

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