Massive spin-3/2 fermion interactions are consistent up to the Planck scale only in broken supergravity, with gravity required by unitarity and the Ward identity.
Soft Spin 3/2 Fermions Require Gravity and Supersymmetry,
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Supergravity from the Bottom Up
Massive spin-3/2 fermion interactions are consistent up to the Planck scale only in broken supergravity, with gravity required by unitarity and the Ward identity.