Open access
Datum
2016-03Typ
- Journal Article
Abstract
In this work we study the cosmological perturbations in massive bigravity in the presence of non-minimal derivative couplings. For this purpose we consider a specific subclass of Horndeski scalar-tensor interactions that live on the unique composite effective metric. For the viability of the model both metrics have to be dynamical. Nevertheless, the number of allowed kinetic terms is crucial. We adapt to the restriction of having one single kinetic term. After deriving the full set of equations of motion for flat Friedmann-Lemaitre-Robertson-Walker background, we study linear perturbations on top of it. We show explicitly that only four tensor, two vector and two scalar degrees of freedom propagate, one of which being the Horndeski scalar, while the Boulware-Deser ghost can be integrated out. Mehr anzeigen
Persistenter Link
https://doi.org/10.3929/ethz-b-000114873Publikationsstatus
publishedExterne Links
Zeitschrift / Serie
Journal of Cosmology and Astroparticle PhysicsBand
Seiten / Artikelnummer
Verlag
IOP PublishingThema
Cosmological perturbation theory; Modified gravityOrganisationseinheit
02889 - ETH Institut für Theoretische Studien / ETH Institute for Theoretical Studies