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An early "Feynman diagram" from Dyson's paper, showing a first quantum correction to propagation of a particle. There is a bold horizontal line with an arrow that briefly branches off at 45 degrees before abruptly stopping and sloping back down to the original horizontal trajectory. The portion of the horizontal line where the original propagator branched off is drawn as a dotted line that represents a virtual particle.

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An early "Feynman diagram" from Dyson's paper, showing a first quantum correction to propagation of a particle. There is a bold horizontal line with an arrow that briefly branches off at 45 degrees before abruptly stopping and sloping back down to the original horizontal trajectory. The portion of the horizontal line where the original propagator branched off is drawn as a dotted line that represents a virtual particle.
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Robert McNees (mcnees@mastodon.social)'s status on Thursday, 15-Dec-2022 16:37:47 UTC Robert McNees
in reply to

Dyson was one of the first physicists to really understand the meaning and power of Feynman's diagrammatic approach to QED.
He published a paper in 1949 showing that this method was equivalent to the operator approach of Schwinger & Tomonaga.
Ref: Dyson, Phys. Rev. 75, 486–502

In conversation Thursday, 15-Dec-2022 16:37:47 UTC from mastodon.social permalink