Tracking K-essence
Astrophysics
2009-11-07 v2 High Energy Physics - Phenomenology
High Energy Physics - Theory
Abstract
We derive a condition for converging a common evolutionary track for k-essence (a scalar field dark energy with non-canonical kinetic terms). For the Lagrangian density V(phi)W(X) with X=dot{phi}^2/2, we find tracker solutions with w_{phi} < w_B exist if Gamma equivalent V''V/(V')^2 > 3/2. Here w_{phi}(w_B) is the equation-of-state of the scalar field (background radiation/matter). Our condition may be useful for examining the existence of the attractor-like behavior in cosmology with k-essence.
Keywords
Cite
@article{arxiv.astro-ph/0206298,
title = {Tracking K-essence},
author = {Takeshi Chiba},
journal= {arXiv preprint arXiv:astro-ph/0206298},
year = {2009}
}
Comments
7 pages, minor changes, to appear in Phys.Rev.D