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Feynman diagram
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Feynman diagram
Feynman diagram Feynman diagram of the interaction of an electron with the electromagnetic force

The basic vertex (V) shows the emission of a photon (γ) by an electron (e−).

Feynman diagram

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Written by
Christine Sutton
Science writer. Research Associate, Department of Nuclear Physics, University of Oxford. Author of The Particle Connection and Spaceship Neutrino.
Christine Sutton
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Key People:
Richard Feynman
Related Topics:
quantum electrodynamics

Feynman diagram, a graphical method of representing the interactions of elementary particles, invented in the 1940s and ’50s by the American theoretical physicist Richard P. Feynman. Introduced during the development of the theory of quantum electrodynamics as an aid for visualizing and calculating the effects of electromagnetic interactions among electrons and photons, Feynman diagrams are now used to depict all types of particle interactions. A Feynman diagram is a two-dimensional representation in which one axis, usually the horizontal axis, is chosen to represent space, while the second (vertical) axis represents time. Straight lines are used to depict fermions—fundamental particles with ...(100 of 586 words)

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