No-go theorem for k-essence dark energy
Astrophysics
2009-11-11 v2 General Relativity and Quantum Cosmology
High Energy Physics - Theory
Abstract
We demonstrate that if k-essence can solve the coincidence problem and play the role of dark energy in the universe, the fluctuations of the field have to propagate superluminally at some stage. We argue that this implies that successful k-essence models violate causality. It is not possible to define a time ordered succession of events in a Lorentz invariant way. Therefore, k-essence cannot arise as low energy effective field theory of a causal, consistent high energy theory.
Cite
@article{arxiv.astro-ph/0606584,
title = {No-go theorem for k-essence dark energy},
author = {Camille Bonvin and Chiara Caprini and Ruth Durrer},
journal= {arXiv preprint arXiv:astro-ph/0606584},
year = {2009}
}
Comments
4 pages, 2 figures. Replaced with revised version accepted for publication in Phys. Rev. Lett