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Sakata-Taketani spin-0 field. Six types of external field couplings are considered, two scalars, two vectors, an antisymmetric second-rank tensor, and a symmetric second-rank tensor, with the results specialized to electromagnetic interactions. For either of the two second-rank couplings, the equation is found to describe noncausal wave propagation, a property that is apparent from the dependence of the coefficients of the space derivatives on the external field; in contrast, the noncausality of the corresponding manifestly covariant Duffin-Kemmer-Petiau spin-0 equation is not so obvious. The possibilities for generalizing our results to higher spin theories involving only the essential 2(2J --I) components for a particle with a definite spin J and mass M are discussed in considerable detail.
Transformation and Light-Cone Current Algebra.
📜 SIMILAR VOLUMES
In Rosen's "bimetric" theory of gravity the (local) speed of gravitational radiation u. is determined by the combined effects of cosmological boundary values and nearby concentrations of matter. It is possible for v. to be less than the speed of light. I show here that emission of gravitational radi