 |
 |
 |
|
|
|
| HAL: hal-00740758, version 1 |
| arXiv: 1202.3131 |
| ADS Bibliographic id: 2012JHEP...09..009D |
| DOI: 10.1007/JHEP09(2012)009 |
| Detailed view |  Export this paper |
 |
| Journal of High Energy Physics 09 (2012) 009 |
|
|
|
|
| Lorentz-violating vs. ghost gravitons: the example of Weyl gravity |
|
|
| N. Deruelle1M. Sasaki2Y. Sendouda1A. Youssef |
|
|
| (2012-09) |
|
|
|
| We show that the ghost degrees of freedom of Einstein gravity with a Weyl term can be tamed by a simple mechanism that invokes local Lorentz symmetry breaking. We demonstrate how the mechanism works in a cosmological setting. The presence of the Weyl term forces a redefinition of the quantum vacuum state of the tensor perturbations. As a consequence the amplitude of their spectrum blows up when the Lorentz-violating scale becomes comparable to the Hubble radius. Such a behaviour is in sharp contrast to what happens in standard Weyl gravity where the gravitational ghosts smoothly damp out the spectrum of primordial gravitational waves. |
|
|
|
|
|
|
|
|
|
|
|
| 1: | APC - AstroParticule et Cosmologie |
|
|
| 2: | Yukawa Institute for Theoretical Physics |
|
|
|
|
|
|
|
|
|
| APC - THEORIE |
|
|
|
|
| Subject | : | Physics/General Relativity and Quantum Cosmology Physics/High Energy Physics - Theory |
|
|
| Cosmology of Theories beyond the SM – Models of Quantum Gravity – Classical Theories of Gravity |
|
|
|
| Fulltext link: |
|
| http://fr.arXiv.org/abs/1202.3131 |
| hal-00740758, version 1 | |
| http://hal.archives-ouvertes.fr/hal-00740758 | |
| oai:hal.archives-ouvertes.fr:hal-00740758 | |
| From: Alina Deniau | |
| Submitted on: Wednesday, 10 October 2012 18:35:40 | |
| Updated on: Wednesday, 10 October 2012 18:35:40 | |
