RT Journal Article T1 Theory of the Rarita-Schwinger field without superluminality A1 Fernández-Rañada, Antonio AB It is shown that the noncausality of the Rarita-Schwinger equation in an external electromagnetic field can be avoided by the substitution of a subsidiary constraint by a subsidiary differential equation. As the number of degrees of freedom increases, the theory represents two kinds of articles with spin l/2 and spin 3/2. Some consequences are studied. PB American Physical Society SN 0556-2821 YR 1980 FD 1980-11-15 LK https://hdl.handle.net/20.500.14352/64905 UL https://hdl.handle.net/20.500.14352/64905 LA eng NO © 1980 The American Physical Society. We are very indebted to Dr. M. Ramón, Dr. M.A. Rodríguez, and Dr. J. Usón for discussions. This paper was partly supported by Junta de Energía Nuclear, Madrid. NO Junta de Energía Nuclear, Madrid DS Docta Complutense RD 11 abr 2025