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A numerical procedure for combined many-body-QED calculations



A procedure for relativistically covariant many-body perturbation theory (MBPT) has been developed, and some numerical implementation has been started. The procedure is based upon the previously introduced covariant evolution operator, which is a field-theoretical concept, closely related to MBPT. The procedure leads to all kinds of relativistic and quantum-electrodynamical effects, and can be shown for two-particle systems to lead to the Bethe-Salpeter equation. In the implementation an extension to the photonic Fock space is made, where the number of photons no longer is constant. © 2008 Wiley Periodicals, Inc. Int J Quantum Chem, 2008