Stable and unstable cosmological models in bimetric massive gravity

@article{Konnig2014StableAU,
  title={Stable and unstable cosmological models in bimetric massive gravity},
  author={Frank Konnig and Yashar Akrami and Luca Amendola and Mariele Motta and Adam R. Solomon Itp Univ. of Heidelberg and Inst. Theor. Astrophys. and Oslo and University of Geneva and Dept. Theor. Phys. and University of Cambridge and Damtp},
  journal={Physical Review D},
  year={2014},
  volume={90},
  pages={124014}
}
Nonlinear, ghost-free massive gravity has two tensor fields; when both are dynamical, the mass of the graviton can lead to cosmic acceleration that agrees with background data, even in the absence of a cosmological constant. Here the question of the stability of linear perturbations in this bimetric theory is examined. Instabilities are presented for several classes of models, and simple criteria for the cosmological stability of massive bigravity are derived. In this way, we identify a… 

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