Crossing of ω=−1 with tachyon and non-minimal derivative coupling

摘要

We construct a single scalar field model with tachyon field non-minimallycoupled to itself, its derivative and to the curvature. We study thecosmological dynamics of the equation of state in this setup. While it isexpected that in the case of single scalar field the crossing of the phantomdivide line can not be realized [10], we show that incorporating quantumcorrections, namely, non-minimal derivative coupling of scalar field withcurvature in our model, lead to phantom divide crossing.