http://arxiv.org/abs/1403.5679
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.
D. Comelli, M. Crisostomi and L. Pilo
Tue, 25 Mar 14
33/79
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