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The Schwinger–Dyson equations (SDEs) or Dyson–Schwinger equations, named after Julian Schwinger and Freeman Dyson, are general relations between correlation ...
Tomonaga, Schwinger, and Feynman were jointly awarded the 1965 Nobel Prize in Physics for their work in this area. [23] Their contributions, and Dyson's, were about covariant and gauge-invariant formulations of quantum electrodynamics that allow computations of observables at any order of perturbation theory.
The technique of renormalization, suggested by Ernst Stueckelberg and Hans Bethe and implemented by Dyson, Feynman, Schwinger, and Tomonaga compensates for this effect and eliminates the troublesome infinities. After renormalization, calculations using Feynman diagrams match experimental results with very high accuracy.
Schwinger–Dyson equation; ... Class equation; ... Defining equation (physical chemistry) List of equations in classical mechanics;
In scattering theory, a part of mathematical physics, the Dyson series, formulated by Freeman Dyson, is a perturbative expansion of the time evolution operator in the interaction picture. Each term can be represented by a sum of Feynman diagrams .
Julian Seymour Schwinger (/ ˈ ʃ w ɪ ŋ ər /; February 12, 1918 – July 16, 1994) was a Nobel Prize-winning American theoretical physicist. He is best known for his work on quantum electrodynamics (QED), in particular for developing a relativistically invariant perturbation theory , and for renormalizing QED to one loop order.
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In fact, since the propagator is obtained by inverting the wave equation, in general, it will have singularities on shell. The energy carried by the particle in the propagator can even be negative . This can be interpreted simply as the case in which, instead of a particle going one way, its antiparticle is going the other way, and therefore ...