Perturbations in massive gravity cosmology

@article{Comelli2012PerturbationsIM,
  title={Perturbations in massive gravity cosmology},
  author={Denis Comelli and Marco Crisostomi and Luigi Pilo},
  journal={Journal of High Energy Physics},
  year={2012},
  volume={2012},
  pages={1-20}
}
A bstractWe study cosmological perturbations for a ghost free massive gravity theory formulated with a dynamical extra metric that is needed to massive deform GR. In this formulation FRW background solutions fall in two branches. In the dynamics of perturbations around the first branch solutions, no extra degree of freedom with respect to GR is present at linearized level, likewise what is found in the Stuckelberg formulation of massive gravity where the extra metric is flat and non dynamical… 

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