Tracking quintessence and k-essence in a general cosmological background
arXiv:gr-qc/0609014 · doi:10.1103/PhysRevD.74.103515
Abstract
We derive conditions for stable tracker solutions for both quintessence and k-essence in a general cosmological background, H^2 \propto f(ρ). We find that tracker solutions are possible only when η= d ln f /d ln ρis constant, aside from a few special cases, which are enumerated. Expressions for the quintessence or k-essence equation of state are derived as a function of ηand the equation of state of the dominant background component.
6 pages, no figures