Structure of the Vertex Function
- 1 August 1959
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 115 (3) , 731-735
- https://doi.org/10.1103/physrev.115.731
Abstract
An integral representation as a function of invariants is found for the Fourier transform of the matrix element between the vacuum and a one-particle state of the retarded commutator of two currents. A special case is a spectral representation for the vertex as a function of momentum transfer. The threshold in this representation is lower than that found in the usual perturbation theory.Keywords
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