Beiträge der irreduziblen Feynman-Diagramme zur Energieabhängigkeit der Quasiteilchen-Streuamplitude
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Contributions of the irreducible Feynman diagrams to the energy dependence of the quasiparticle scattering amplitude
Abstract
The evaluation of the Feynman diagrams contributing to the quasiparticle scattering amplitude Γω exhibits for special momenta the impossibility of expanding this function into a power series in terms of ω at ω=0 because of the existence of a branch cut in the complex energy plane. The value of the discontinuity across the cut is proportional to ¦ω¦.
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© Springer-Verlag 1971