K-essence and the coincidence problem

Details K-essence and the coincidence problem K-essence and the coincidence problem

2003-04-15

arxiv.org/abs/astro-ph/0304277v2

Phys.Rev. D68 (2003) 023512

Astronomy and Astrophysics

Astrophysics

5 pages RevTeX4 file with two figures incorporated. Minor changes to match PRD accepted version

Scientific paper

10.1103/PhysRevD.68.023512

K-essence has been proposed as a possible means of explaining the coincidence problem of the Universe beginning to accelerate only at the present epoch. We carry out a comprehensive dynamical systems analysis of the k-essence models given so far in the literature. We numerically study the basin of attraction of the tracker solutions and we highlight the behaviour of the field close to sound speed divergences. We find that, when written in terms of parameters with a simple dynamical interpretation, the basins of attraction represent only a small region of the phase space.

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