Conservation laws for the classical Maxwell–Dirac and Klein–Gordon–Dirac equations

Abstract
Solutions to the classical coupled Maxwell–Dirac and Klein–Gordon–Dirac equations in a space–time of dimension four are considered. These equations are invariant under the 15‐dimensional conformal group, in the case of zero mass. The resulting conservation laws are explicitly exhibited in terms of the Cauchy data at a fixed time in a form suitable for analysis by the techniques of partial differential equations.