Tracking quintessence and k-essence in a general cosmological background

Details Tracking quintessence and k-essence in a general cosmological background Tracking quintessence and k-essence in a general cosmological background

2006-09-05

arxiv.org/abs/gr-qc/0609014v1

Phys.Rev.D74:103515,2006

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

6 pages, no figures

Scientific paper

10.1103/PhysRevD.74.103515

We derive conditions for stable tracker solutions for both quintessence and k-essence in a general cosmological background, H^2 \propto f(\rho). We find that tracker solutions are possible only when \eta = d ln f /d ln \rho 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 \eta and the equation of state of the dominant background component.

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