Revisiting the cuscuton as a Lorentz-violating gravity theory

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 Hořava gravity in a certain limit. Here we revisit the cuscuton theory as a Lorentz-violating gravity theory. We clarify its relation with Hořava...

Full description

Saved in:
Bibliographic Details
Published in:Physical review. D 2018-03, Vol.97 (6), Article 064020
Main Authors: Bhattacharyya, Jishnu, Coates, Andrew, Colombo, Mattia, Gümrükçüoğlu, A. Emir, Sotiriou, Thomas P.
Format: Article
Language:English
Subjects:
Cosmology
Gravitation
Gravitational collapse
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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 Hořava gravity in a certain limit. Here we revisit the cuscuton theory as a Lorentz-violating gravity theory. We clarify its relation with Hořava gravity and Einstein-æther 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 Hořava gravity in the context of gravitational collapse and formation of universal horizons.
ISSN:2470-0010
2470-0029
DOI:10.1103/PhysRevD.97.064020