402 citations · 3.3k across the 52 of their papers we have counts for
3 papers · 1 filter
A general mass term for bigravity
Giulia Cusin, Ruth Durrer, Pietro Guarato +1
We introduce a new formalism to study perturbations of Hassan-Rosen bigravity theory, around general backgrounds for the two dynamical metrics. In particular, we derive the general…
Inflationary perturbations in bimetric gravity
Giulia Cusin, Ruth Durrer, Pietro Guarato +1
In this paper we study the generation of primordial perturbations in a cosmological setting of bigravity during inflation. We consider a model of bigravity which can reproduce the…
Tensor instabilities at the end of the LCDM universe
Giulia Cusin, Filipe de O. Salles, Ilya L. Shapiro
The unphysical spin-2 massive degrees of freedom in higher derivative gravity may be either massive unphysical ghosts or tachyonic ghosts. In the last case there is no Planck-scale…