Nonlinear properties of vielbein massive gravity

@article{GrootNibbelink2007NonlinearPO,
  title={Nonlinear properties of vielbein massive gravity},
  author={S. Groot Nibbelink and Marco Peloso and M G Sexton},
  journal={The European Physical Journal C},
  year={2007},
  volume={51},
  pages={741-752}
}
We propose a nonlinear extension of the Fierz–Pauli mass for the graviton through a functional of the vielbein and an external Minkowski background. The functional generalizes the notion of the measure, since it reduces to a cosmological constant if the external background is formally sent to zero. Such a term and the explicit external background emerge dynamically from a bi-gravity theory, having both a massless and a massive graviton in its spectrum, in a specific limit in which the massless… 

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