# Attractor scenarios and superluminal signals in k-essence cosmology

@article{Kang2007AttractorSA,
title={Attractor scenarios and superluminal signals in k-essence cosmology},
author={Jin U. Kang and Vitaly Vanchurin and Sergei Winitzki},
journal={Physical Review D},
year={2007},
volume={76},
pages={083511}
}
• Published 27 June 2007
• Physics
• Physical Review D
Cosmological scenarios with k-essence are invoked in order to explain the observed late-time acceleration of the Universe. These scenarios avoid the need for fine-tuned initial conditions (the 'coincidence problem') because of the attractorlike dynamics of the k-essence field {phi}. It was recently shown that all k-essence scenarios with Lagrangians p=L(X){phi}{sup -2}, where X{identical_to}(1/2){phi}{sub ,{mu}}{phi}{sup ,{mu}}, necessarily involve an epoch where perturbations of {phi…
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