Uninvited guest in mixed derivative Hořava gravity
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 a...
| Main Authors: | , , , |
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| Format: | Article |
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American Physical Society
2016
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| Online Access: | https://eprints.nottingham.ac.uk/39497/ |
| _version_ | 1848795850703110144 |
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| author | Coates, Andrew Colombo, Mattia Gümrükçüoğlu, A. Emir Sotiriou, Thomas P. |
| author_facet | Coates, Andrew Colombo, Mattia Gümrükçüoğlu, A. Emir Sotiriou, Thomas P. |
| author_sort | Coates, Andrew |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | 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. |
| first_indexed | 2025-11-14T19:38:39Z |
| format | Article |
| id | nottingham-39497 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| last_indexed | 2025-11-14T19:38:39Z |
| publishDate | 2016 |
| publisher | American Physical Society |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-394972020-05-04T18:17:49Z https://eprints.nottingham.ac.uk/39497/ Uninvited guest in mixed derivative Hořava gravity Coates, Andrew Colombo, Mattia Gümrükçüoğlu, A. Emir Sotiriou, Thomas P. 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. American Physical Society 2016-10-06 Article PeerReviewed Coates, Andrew, Colombo, Mattia, Gümrükçüoğlu, A. Emir and Sotiriou, Thomas P. (2016) Uninvited guest in mixed derivative Hořava gravity. Physical Review D, 94 (8). 84014/1-84014/12. ISSN 2470-0010 http://dx.doi.org/10.1103/PhysRevD.94.084014 doi:10.1103/PhysRevD.94.084014 doi:10.1103/PhysRevD.94.084014 |
| spellingShingle | Coates, Andrew Colombo, Mattia Gümrükçüoğlu, A. Emir Sotiriou, Thomas P. Uninvited guest in mixed derivative Hořava gravity |
| title | Uninvited guest in mixed derivative Hořava gravity |
| title_full | Uninvited guest in mixed derivative Hořava gravity |
| title_fullStr | Uninvited guest in mixed derivative Hořava gravity |
| title_full_unstemmed | Uninvited guest in mixed derivative Hořava gravity |
| title_short | Uninvited guest in mixed derivative Hořava gravity |
| title_sort | uninvited guest in mixed derivative hořava gravity |
| url | https://eprints.nottingham.ac.uk/39497/ https://eprints.nottingham.ac.uk/39497/ https://eprints.nottingham.ac.uk/39497/ |