Particles, Sources, And Fields, Volume 3
An extension of Dr. Schwinger's two previous classic works, this volume contains four sections in addition to the previous sections of Electrodynamics II, which were concerned with the two-particle problem, and applications to hydrogenic atoms, positronium, and muonium.
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2k TT Accordingly additional anticommuting appears asymptotic calculation cancels causal coefficient combination commutator consider contact terms contribution Coulomb coupling decay differential equation Dirac equation discussion e-is e-isk e-isſ e—is effect eigenfunctions eigenvalues electrodynamics electromagnetic electron emission energy operator evaluation exhibited expectation value explicit exponential expression expſ field strengths form factor function equation gauge gauge invariance gives hyperfine structure inferred instantaneous introduced last term latter linear m2eH magnetic field magnetic moment matrix modification momentum integral muonium non-causal non-relativistic notation ortho p+k)+m r partial integration particle photon propagation function positronium primitive interaction produced pseudoscalar pseudovector quantum number r2 t r1 relation relativistic replaced result s-integral Section simplified situation ſol ſoldu ſooods spin ſqs ſqu structure substitution transformation two-photon u)eq vacuum amplitude vanishes variable virtual particle wave function weight function