155 articles – 1965 Notices  [english version]
HAL : hal-00740758, version 1

Fiche concise  Récupérer au format
Lorentz-violating vs. ghost gravitons: the example of Weyl gravity
Deruelle N., Sasaki M., Sendouda Y., Youssef A.
Journal of High Energy Physics 09 (2012) 009 - http://hal.archives-ouvertes.fr/hal-00740758
Physique/Relativité Générale et Cosmologie Quantique
Physique/Physique des Hautes Energies - Théorie
Lorentz-violating vs. ghost gravitons: the example of Weyl gravity
N. Deruelle1, M. Sasaki2, Y. Sendouda1, A. Youssef
1 :  APC - UMR 7164 - AstroParticule et Cosmologie
http://www.apc.univ-paris7.fr/
CNRS : UMR7164 – IN2P3 – Observatoire de Paris – Université Paris VII - Paris Diderot – CEA : DSM/IRFU
APC - UMR 7164, Université Paris Diderot, 10 rue Alice Domon et Léonie Duquet, case postale 7020, F-75205 Paris Cedex 13
France
2 :  Yukawa Institute for Theoretical Physics
University of Kyoto
Kyoto University, Kyoto 606-8502
Japon
APC - THEORIE
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.
Anglais
14/02/2012

Journal of High Energy Physics
Publisher Institute of Physics (IOP)
ISSN 1126-6708 (eISSN : 1029-8479)
internationale
Articles dans des revues avec comité de lecture
09/2012
09
009

Cosmology of Theories beyond the SM – Models of Quantum Gravity – Classical Theories of Gravity
14 pages, 3 figures, REVTeX 4.1

Lien vers le texte intégral : 
http://fr.arXiv.org/abs/1202.3131