%0 Journal Article
%T FRW Cosmological Perturbations in Massive Bigravity
%A D. Comelli
%A M. Crisostomi
%A L. Pilo
%J Physics
%D 2014
%I arXiv
%R 10.1103/PhysRevD.90.084003
%X Cosmological perturbations of FRW solutions in ghost free massive bigravity, including also a second matter sector, are studied in detail. At early time, we find that sub horizon exponential instabilities are unavoidable and they lead to a premature departure from the perturbative regime of cosmological perturbations.
%U http://arxiv.org/abs/1403.5679v1