On non-linear actions for massive gravity

  title={On non-linear actions for massive gravity},
  author={Sayed Fawad Hassan and Rachel A. Rosen},
  journal={Journal of High Energy Physics},
In this work we present a systematic construction of the potentially ghost-free non-linear massive gravity actions. The most general action can be regarded as a 2-parameter deformation of a minimal massive action. Further extensions vanish in 4 dimensions. The general mass term is constructed in terms of a “deformed” determinant from which this property can clearly be seen. In addition, our formulation identifies nondynamical terms that appear in previous constructions and which do not… 

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