# Ghost Properties of Generalized Theories of Gravitation

@article{Mann1982GhostPO, title={Ghost Properties of Generalized Theories of Gravitation}, author={R. Mann and J. Moffat}, journal={Physical Review D}, year={1982}, volume={26}, pages={1858-1861} }

We investigate theories of gravitation, in which spacetime is non-Riemannian and the metric ${g}_{\ensuremath{\mu}\ensuremath{\nu}}$ is nonsymmetric, for ghosts and tachyons, using a spin-projection operator formalism. Ghosts are removed not by gauge invariance but by a Lagrange multiplier ${W}_{\ensuremath{\mu}}$, which occurs due to the breaking of projective invariance in the theory. Unified theories based on a Lagrangian containing a term $\ensuremath{\lambda}{g}^{\ensuremath{\mu… Expand