# 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} }

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…

## 60 Citations

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