k-Essence, superluminal propagation, causality and emergent geometry
High Energy Physics - Theory
2011-02-25 v1 Astrophysics
General Relativity and Quantum Cosmology
Abstract
The k-essence theories admit in general the superluminal propagation of the perturbations on classical backgrounds. We show that in spite of the superluminal propagation the causal paradoxes do not arise in these theories and in this respect they are not less safe than General Relativity.
Cite
@article{arxiv.0708.0561,
title = {k-Essence, superluminal propagation, causality and emergent geometry},
author = {Eugeny Babichev and Viatcheslav Mukhanov and Alexander Vikman},
journal= {arXiv preprint arXiv:0708.0561},
year = {2011}
}
Comments
34 pages, 5 figures