FRW Cosmological Perturbations in Massive Bigravity

Abstract

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.

arXiv commentlatex, 14 pages

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