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 Y. Akrami and L. Amendola and M. Motta and A. R. S. I. U. O. Heidelberg and I. Astrophys. and Oslo and U. Geneva and D. Phys. and U. 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… Expand