Crossing the phantom divide without phantom matter
May, 2006
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Abstract: (arXiv)
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, . 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.- membrane model
- expansion: acceleration
- quintessence
- Dvali-Gabadadze-Porrati model
- dynamical system
- phantom
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