The Second-Order Equation from the (1/2,0)+ (0,1/2) Representation of the Poincare Group
Abstract
On the basis of the first principles we derive the Barut-Wilson-Fushchich second-order equation in the (1/2,0)+(0,1/2) representation. Then we discuss the possibility of the description of various mass and spin states in such a framework.
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