Validity of Ehrenfest's theorem for generalized elds of dyons

Abstract

The validity of Ehrenfest's theorem with its classical correspondence has been justi ed for the manifestlycovariant equations of dyons. We have also developed accordingly the Lagrangian formulation for electromagnetic eldsin a minimum coupled source giving rise to conserved current of dyons. Applying the Gupta subsidiary condition wehave extended the validity of the Ehrenfest's theorem forU(1) U(1) Abelian gauge theory of dyons. It is shownthat the expectation value of the quantum equation of motion reproduces the classical equation of motion, which is thegeneralized form of Ehrenfest's theorem in quantum eld theory.