Revisiting the cuscuton as a Lorentz-violating gravity theory

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Bhattacharyya, Jishnu, Coates, Andrew, Colombo, Mattia, Gümrükçüoğlu, A. Emir and Sotiriou, Thomas P. (2018) Revisiting the cuscuton as a Lorentz-violating gravity theory. Physical Review D, 97 (6). 064020. ISSN 2470-0010

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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-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 Horava gravity in the context of gravitational collapse and formation of universal horizons.

Item Type: Article
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Mathematical Sciences
University of Nottingham, UK > Faculty of Science > School of Physics and Astronomy
Identification Number: https://doi.org/10.1103/PhysRevD.97.064020
Depositing User: Eprints, Support
Date Deposited: 12 Apr 2018 11:58
Last Modified: 13 Apr 2018 18:11
URI: https://eprints.nottingham.ac.uk/id/eprint/51113

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