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- W1972325560 abstract "Techniques of Erickson and Yennie [Ann. Phys. N.Y. 35, 271 (1965)] are applied in an investigation of a simple Taylor’s series which involves products of commutators and nested commutators and which represents the self-energy operator Σ of an electron in an external potential. A technique of ‘‘moving the parameter integrals to the mass’’ leads to a relatively simple representation of all terms as a one-dimensional integral over a common virtual electron mass squared parameter. Although not a true expansion in powers of the external field, the method provides a window on the higher-order terms in the self-energy operator. Mass eigenfunction expansion concepts are shown to be quite useful in a discussion of infrared divergences." @default.
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- W1972325560 date "1993-12-01" @default.
- W1972325560 modified "2023-10-18" @default.
- W1972325560 title "Commutator expansion of the self‐energy operator for an electron in an external potential" @default.
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- W1972325560 doi "https://doi.org/10.1063/1.530319" @default.
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