Symmetry and combinatorics in the expansion for QED

Bilha Segev

Research output: Contribution to journalArticlepeer-review


Combinatorics and symmetry are used to solve calculational problems in applying the -expansion method to QED. Adequate Feynman rules are used to simplify previous calculations and Ward identities are obtained. In the case with no external fermions an equivalence to the conventional loop expansion is established, both through the use of path integrals and through explicit calculations of the effective vertices. The Ward identities are reduced in this case to the conventional ones implied by gauge invariance.

Original languageEnglish
Pages (from-to)3713-3733
Number of pages21
JournalPhysical Review D
Issue number10
StatePublished - 1 Jan 1992
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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