A stringinspired quintom model of dark energy
Abstract
We propose in this Letter a quintom model of dark energy with a single scalar field ϕ given by the Lagrangian L=V(ϕ)1^{}∇_{}ϕ∇^{}ϕ+β^{}ϕ□ϕ)1/2. In the limit of β^{}→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.
 Publication:

Physics Letters B
 Pub Date:
 July 2007
 DOI:
 10.1016/j.physletb.2007.05.056
 arXiv:
 arXiv:hepth/0701016
 Bibcode:
 2007PhLB..651....1C
 Keywords:

 High Energy Physics  Theory;
 Astrophysics;
 General Relativity and Quantum Cosmology;
 High Energy Physics  Phenomenology
 EPrint:
 6 pages, 4 figures, accepted by PLB