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Causal Propagation of a Charged Spin 3/2 Field in an External Electromagnetic Background
We present a Lagrangian for a massive, charged spin 3/2 field in a constant external electromagnetic background, which correctly propagates only physical degrees of freedom inside the light cone. The Velo-Zwanziger acausality and other pathologies such as loss of hyperbolicity or the appearance of u...
| Autores principales: | , |
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| Formato: | info:eu-repo/semantics/article |
| Lenguaje: | eng |
| Publicado: |
2009
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| Materias: | |
| Acceso en línea: | http://cds.cern.ch/record/1181684 |
| Sumario: | We present a Lagrangian for a massive, charged spin 3/2 field in a constant external electromagnetic background, which correctly propagates only physical degrees of freedom inside the light cone. The Velo-Zwanziger acausality and other pathologies such as loss of hyperbolicity or the appearance of unphysical degrees of freedom are avoided by a judicious choice of non-minimal couplings. No additional fields or equations besides the spin 3/2 ones are needed to solve the problem. |
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