Vacuum-polarization potential, finite-size effects, and the coulomb propagator

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3 Scopus citations


A momentum representation for the fermion propagator in an external electromagnetic field is derived from which a convenient form for the vacuum-polarization potential is obtained. This expression, for which the trace has already been taken, can be used for calculating the dependence of higher-order corrections on the form factors of the external field. Expanding in powers of the external field we obtain the lowest-order correction as well as the third-order correction to the vacuum-polarization potential. The external-field, fermion propagator is also used to obtain an expression for the Delbrück scattering amplitude.

Original languageEnglish
Pages (from-to)424-429
Number of pages6
JournalPhysical Review D
Issue number2
StatePublished - 1 Jan 1973
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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