K-essence and the coincidence problem
Astrophysics
2009-11-07 v2
Abstract
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.
Keywords
Cite
@article{arxiv.astro-ph/0304277,
title = {K-essence and the coincidence problem},
author = {Michael Malquarti and Edmund J Copeland and Andrew R Liddle},
journal= {arXiv preprint arXiv:astro-ph/0304277},
year = {2009}
}
Comments
5 pages RevTeX4 file with two figures incorporated. Minor changes to match PRD accepted version