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Uninvited guest in mixed derivative Hořava gravity

Coates, Andrew; Colombo, Mattia; Gümrükçüoğlu, A. Emir; Sotiriou, Thomas P.

Authors

Andrew Coates

Mattia Colombo

A. Emir Gümrükçüoğlu

THOMAS SOTIRIOU Thomas.Sotiriou@nottingham.ac.uk
Professor of Gravitational Physics



Abstract

We revisit the mixed-derivative extension of Hořava gravity which was designed to address the naturalness problems of the standard theory in the presence of matter couplings. We consider the minimal theory with mixed-derivative terms that contain two spatial and two temporal derivatives. Including all terms compatible with the (modified) scaling rules and the foliation-preserving diffeomorphisms, we calculate the dispersion relations of propagating modes. We find that the theory contains four propagating degrees of freedom, as opposed to three in the standard Hořava gravity. The new degree of freedom is another scalar graviton, and it is unstable at low energies. Our result brings tension to the Lorentz-violation suppression mechanism that relies on separation of scales.

Journal Article Type Article
Publication Date Oct 6, 2016
Journal Physical Review D
Print ISSN 2470-0010
Electronic ISSN 2470-0010
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 94
Issue 8
Article Number 84014
APA6 Citation Coates, A., Colombo, M., Gümrükçüoğlu, A. E., & Sotiriou, T. P. (2016). Uninvited guest in mixed derivative Hořava gravity. Physical Review D, 94(8), https://doi.org/10.1103/PhysRevD.94.084014
DOI https://doi.org/10.1103/PhysRevD.94.084014
Publisher URL http://dx.doi.org/10.1103/PhysRevD.94.084014
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf
Additional Information ©2016 American Physical Society.

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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