Speaker
Mariele Motta
(University of Geneva)
Description
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.
Author
Mariele Motta
(University of Geneva)
