Revisiting the cuscuton as a Lorentz-violating gravity theory
High Energy Physics - Theory
2018-04-18 v2 Cosmology and Nongalactic Astrophysics
General Relativity and Quantum Cosmology
Abstract
The cuscuton is a scalar field with infinite speed of propagation. It was introduced in the context of cosmology but it has also been claimed to resemble Horava gravity in a certain limit. Here we revisit the cuscuton theory as a Lorentz-violating gravity theory. We clarify its relation with Horava gravity and Einstein-aether theory, analyze its causal structure, and consider its initial value formulation. Finally, we discuss to which extent the cuscuton theory can be used as a proxy for Horava gravity in the context of gravitational collapse and formation of universal horizons.
Keywords
Cite
@article{arxiv.1612.01824,
title = {Revisiting the cuscuton as a Lorentz-violating gravity theory},
author = {Jishnu Bhattacharyya and Andrew Coates and Mattia Colombo and A. Emir Gumrukcuoglu and Thomas P. Sotiriou},
journal= {arXiv preprint arXiv:1612.01824},
year = {2018}
}
Comments
9 pages, revised version as published in PRD