Non-Perturbative External Field Effects in QED

  • Janos Polonyi
Part of the NATO ASI Series book series (NSSB, volume 255)


QED is the most thoroughly studied quantum field theory. The predictions up to the order O(e 8) perturbation expansion have been confronted with the experiments with success1 and the manner how ultraviolet divergences are handled is supported by the phenomenology related to the axial anomaly2. But QED cannot be reduced to a set of the Feynman diagrams, there are phenomena which are inherently non-perturbative in their nature. The well known examples are the bound state formation and the strong interactions at short distances. They can be handled by resumming an infinite subset of Feynman diagrams by methods such as the Bethe-Salpeter equation3 and the renormalization group4.


Renormalization Group External Field Perturbation Expansion Renormalization Condition Fermi Sphere 
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Copyright information

© Plenum Press, New York 1991

Authors and Affiliations

  • Janos Polonyi
    • 1
  1. 1.Center for Theoretical Physics Laboratory for Nuclear Science and Department of PhysicsMassachusetts Institute of TechnologyCambridgeUSA

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