Crossing of $ω=-1$ with Tachyon and Non-minimal Derivative Coupling

Details Crossing of $ω=-1$ with Tachyon and Non-minimal Derivative Coupling Crossing of $ω=-1$ with Tachyon and Non-minimal Derivative Coupling

2011-05-25

arxiv.org/abs/1105.4967v2

Phys.Lett.B703:366-369,2011

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

11 pages, 2 figures. Some explanations and references added. Accepted for publication in Phys. Lett. B

Scientific paper

10.1016/j.physletb.2011.07.080

We construct a single scalar field model with tachyon field non-minimally coupled to itself, its derivative and to the curvature. We study the cosmological dynamics of the equation of state in this setup. While it is expected that in the case of single scalar field the crossing of the phantom divide line can not be realized [10], we show that incorporating quantum corrections, namely, non-minimal derivative coupling of scalar field with curvature in our model, lead to phantom divide crossing.

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