Free spin 2 duality invariance cannot be extended to general relativity

@inproceedings{Deser2005FreeS2,
  title={Free spin 2 duality invariance cannot be extended to general relativity},
  author={Stanley Deser and Domenico Seminara},
  year={2005}
}
‘‘Duality’’ has become a touchstone in relating seemingly different regimes and models in field and string theory. Its humble origins lie in the ancient observation that in (and only in) D 4, on-shell configurations with mutually rotated electric-magnetic fields also obey the source-free Maxwell equations. While this observation is essentially correct, it is sometimes misunderstood. Duality can only be properly formulated in terms of the unconstrained dynamical variables, rather than as a… CONTINUE READING