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

Abstract

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.

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

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• Curvaton with Nonminimal Derivative Coupling to Gravity II: Full Perturbation Analysis
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• Warm inflation with an oscillatory inflaton in the non-minimal kinetic coupling model
• Phantom Divide Crossing with General Non-minimal Kinetic Coupling