Generalized total angular momentum operator for the Dirac equation in curved space-time

Abstract
It is found that an operator of the form iγ5γμ[fμνν(16)γνγρfμν;ρ] commutes with the Dirac operator γμν whenever fμν is an antisymmetric tensor satisfying the Penrose-Floyd equation fμ(ν;ρ)=0. Such a tensor exists notably in the Kerr solutions and in the flat-space limit wherein the operator can be interpreted as the square root of the ordinary total squared angular momentum Casimir operator of the rotation group.

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