A String-Inspired Quintom Model Of Dark Energy

Details A String-Inspired Quintom Model Of Dark Energy A String-Inspired Quintom Model Of Dark Energy

2007-01-02

arxiv.org/abs/hep-th/0701016v3

Phys.Lett.B651:1-7,2007

Physics

High Energy Physics

High Energy Physics - Theory

6 pages, 4 figures, accepted by PLB

Scientific paper

10.1016/j.physletb.2007.05.056

We propose in this paper a quintom model of dark energy with a single scalar field $\phi$ given by the lagrangian ${\cal L}=-V(\phi)\sqrt{1-\alpha^\prime\nabla_{\mu}\phi\nabla^{\mu}\phi +\beta^\prime \phi\Box\phi}$. In the limit of $\beta^\prime\to$0 our model reduces to the effective low energy lagrangian of tachyon considered in the literature. We study the cosmological evolution of this model, and show explicitly the behaviors of the equation of state crossing the cosmological constant boundary.

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