13-18 December 2015
International Conference Centre Geneva
Europe/Zurich timezone

Linear perturbations in massive bigravity: formalism and cosmology

16 Dec 2015, 16:35
Level 2, Room 14 (International Conference Centre Geneva)

Level 2, Room 14

International Conference Centre Geneva

17 Rue de Varembé, 1211 Geneva


Mariele Motta (University of Geneva)


In this talk I will discuss linear perturbations of dRGT massive bi-gravity with a single metric coupled to matter. First, I will introduce the formal derivation of the second order action for generic metrics. I will then use this result to identify stability bounds. Finally, I will discuss the linear perturbations on a FRW background, the cosmology of different branches, the number of degrees of freedom of the theory and the presence of instabilities.

Primary author

Mariele Motta (University of Geneva)

Presentation Materials