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| HAL : hal-00740758, version 1 |
| arXiv : 1202.3131 |
| Code Bibliographique ADS : 2012JHEP...09..009D |
| DOI : 10.1007/JHEP09(2012)009 |
| Fiche détaillée |  Récupérer au format |
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| Journal of High Energy Physics 09 (2012) 009 |
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| Lorentz-violating vs. ghost gravitons: the example of Weyl gravity |
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| N. Deruelle1M. Sasaki2Y. Sendouda1A. Youssef |
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| (09/2012) |
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| 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. |
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| 1 : | APC - AstroParticule et Cosmologie |
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| 2 : | Yukawa Institute for Theoretical Physics |
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| APC - THEORIE |
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| Domaine | : | Physique/Relativité Générale et Cosmologie Quantique Physique/Physique des Hautes Energies - Théorie |
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| Cosmology of Theories beyond the SM – Models of Quantum Gravity – Classical Theories of Gravity |
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| Lien vers le texte intégral : |
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| 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 | |
| Contributeur : Alina Deniau | |
| Soumis le : Mercredi 10 Octobre 2012, 18:35:40 | |
| Dernière modification le : Mercredi 10 Octobre 2012, 18:35:40 | |
