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High Energy, Nuclear, Particle Physics
Causality for internel vertex in Feynaman diagrams
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[QUOTE="vanhees71, post: 6434021, member: 260864"] You cannot interpret the internal lines as particles. They are just clever mathematical notations to express the contributions of the perturbative series to the S-matrix element under consideration. Only the external legs stand for observable asymptotic free particle states, and only those are interpretable as particles. The causality and Poincare invariance of the scheme is guaranteed for such observable quantities through the microcausality property of the field operators. [/QUOTE]
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Physics
High Energy, Nuclear, Particle Physics
Causality for internel vertex in Feynaman diagrams
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