Tracking quintessence and k-essence in a general cosmological background
Abstract
We derive conditions for stable tracker solutions for both quintessence and k-essence in a general cosmological background, H2 f(). We find that tracker solutions are possible only when η = d ln f /d ln is 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 η and the equation of state of the dominant background component.
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