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Definition: Quantum Electrodynamics |
Quantum ElectrodynamicsNoun1. A relativistic quantum theory of the electromagnetic interactions of photons and electrons and muons. Source: WordNet 1.7.1 Copyright © 2001 by Princeton University. All rights reserved. |
Synonym: Quantum ElectrodynamicsSynonym: QED (n). (additional references) |
(From Wikipedia, the free Encyclopedia)
Quantum electrodynamics, or QED, is a quantum field theory of electromagnetism. QED describes all phenomena exhibited by charged point particles, such as electrons and positrons, and the particles of light (photons), interacting by electromagnetism. This theory includes classical electrodynamics in the limit of large fields, but also explains purely quantum phenomena such as the structure of atoms and molecules, the creation of particles by an electromagnetic field, and the anomalous magnetic moment of the electron. (The latter prediction has been experimentally confirmed to 11 decimal digits.)
QED was the first quantum field theory in which the difficulties of building a consistent, fully quantum description of fields and creation and annihilation of quantum particles were satisfactorily resolved. Sin-Itiro Tomonaga, Julian Schwinger, and Richard Feynman received the 1965 Nobel Prize in Physics for its development.
Pure QED in 4 dimensions with n particles is reserved for the quantum field theory with the Lagrangian
where is the covariant derivative and is the coupling strength.
See sign convention.
See also Gauge theory, Functional integral.
R. P. Feynman, QED: The strange theory of light and matter
[ISBN 0691024170]Literature
Source: adapted by the editor from Wikipedia, the free encyclopedia under a copyleft GNU Free Documentation License (GFDL) from the article "Quantum electrodynamics."
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| The following statistics estimate the number of searches per day across the major English-language search engines as identified by various trade publications. Hyperlinks lead to commercial use of the expression at Amazon.com. |
| Expression | Frequency per Day |
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Hexadecimal (or equivalents, 770AD-1900s) (references)51 75 61 6E 74 75 6D 45 6C 65 63 74 72 6F 64 79 6E 61 6D 69 63 73 |
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Binary Code (1918-1938, probably earlier) (references)01010001 01110101 01100001 01101110 01110100 01110101 01101101 00100000 01000101 01101100 01100101 01100011 01110100 01110010 01101111 01100100 01111001 01101110 01100001 01101101 01101001 01100011 01110011 |
HTML Code (1990) (references)Q u a n t u m   E l e c t r o d y n a m i c s |
ISO 10646 (1991-1993) (references)0051 0075 0061 006E 0074 0075 006D 0045 006C 0065 0063 0074 0072 006F 0064 0079 006E 0061 006D 0069 0063 0073 |
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Copyright © Philip M. Parker, INSEAD. Terms of Use.
