Causal Propagation of a Charged Spin 3/2 Field in an External Electromagnetic Background

Details Causal Propagation of a Charged Spin 3/2 Field in an External Electromagnetic Background Causal Propagation of a Charged Spin 3/2 Field in an External Electromagnetic Background

2009-06-08

arxiv.org/abs/0906.1432v2

Phys.Rev.D80:025009,2009

Physics

High Energy Physics

High Energy Physics - Theory

10 pages, references added. To appear in PRD

Scientific paper

10.1103/PhysRevD.80.025009

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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