Nonperturbative quantum electrodynamics: The Lamb shift
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The nonlinear integro-differential equation, obtained from the coupled Maxwell-Dirac equations by eliminating the potential Aμ, is solved by iteration rather than perturbation. The energy shift is complex, the imaginary part giving the spontaneous emission. Both self-energy and vacuum polarization terms are obtained. All results, including renormalization terms, are finite.
KeywordsImaginary Part Spontaneous Emission Energy Shift Quantum Electrodynamic Vacuum Polarization
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