Resolving the ghost problem in nonlinear massive gravity.

@article{Hassan2012ResolvingTG,
  title={Resolving the ghost problem in nonlinear massive gravity.},
  author={Sayed Fawad Hassan and Rachel A. Rosen},
  journal={Physical review letters},
  year={2012},
  volume={108 4},
  pages={
          041101
        }
}
We analyze the ghost issue in the recently proposed models of nonlinear massive gravity in the Arnowitt-Deser-Misner formalism. We show that, in the entire two-parameter family of actions, the Hamiltonian constraint is maintained at the complete nonlinear level and we argue for the existence of a nontrivial secondary constraint. This implies the absence of the pathological Boulware-Deser ghost to all orders. To our knowledge, this is the first demonstration of the existence of a consistent… 

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