Massive Gravity in Curved Cosmological Backgrounds

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dc.creatorMaeno, Masahiro
dc.creatorOda, Ichiro
dc.date2008-08-11
dc.date2008-12-15
dc.date.accessioned2026-07-07T12:38:44Z
dc.date.available2026-07-07T12:38:44Z
dc.descriptionWe study the physical propagating modes in a massive gravity model in curved cosmological backgrounds, which we have found as classical solutions in our previous paper. We show that, generically, there exist such the cosmological background solutions consistent with the equations of motion where we assume the ghost condensation ansatzes. Using the (1+3)-parametrization of the metric fluctuations with 'unitary' gauge, we find that there is neither a scalar ghost nor a tachyon in the spectrum of the propagating modes, the tensor modes become massive owing to gravitational Higgs mechanism, and the model is free of the Boulware-Deser instability. The price we have to pay is that the scalar sector breaks the Lorentz-invariance, but there are no pathologies in the spectrum and lead to interesting phenomenology. Moreover, we present a proof of the absence of non-unitary modes for a specific ghost condensation model in a cosmological background.
dc.description20 pages
dc.identifierhttps://arxiv.org/abs/0808.1394
dc.identifierhttp://arxiv.org/abs/0808.1394
dc.identifierInt.J.Mod.Phys.A24:81-100,2009
dc.identifierdoi:10.1142/S0217751X09043146
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/218864
dc.subjectHigh Energy Physics - Theory
dc.titleMassive Gravity in Curved Cosmological Backgrounds
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