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In particle physics, quenched approximation is an approximation often used in lattice gauge theory in which the quantum loops of fermions in Feynman diagrams are neglected. Equivalently, the corresponding one-loop determinants are set to one. This approximation is often forced upon the physicists because the calculation with the Grassmann numbers becomes relatively awkward in lattice gauge theory.
Additional recommended knowledge
Most of the recent calculations avoid the quenched approximation.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Quenched_approximation". A list of authors is available in Wikipedia.|