On the cosmology of massive gravity

@article{DeFelice2013OnTC,
  title={On the cosmology of massive gravity},
  author={Antonio De Felice and A. Emir G{\"u}mr{\"u}kç{\"u}oğlu and Chunshan Lin and Shinji Mukohyama},
  journal={Classical and Quantum Gravity},
  year={2013},
  volume={30}
}
We present a review of cosmological solutions in nonlinear massive gravity, focusing on the stability of perturbations. Although homogeneous and isotropic solutions have been found, these are now known to suffer from either the Higuchi ghost or a new nonlinear ghost instability. We discuss two approaches to alleviate this issue. By relaxing the symmetry of the background by e.g. breaking isotropy in the hidden sector, it is possible to accommodate a stable cosmological solution. Alternatively… 

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