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In lattice field theory, the 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 is computationally very difficult in lattice gauge theory. In particular, quenched QED is QED without dynamical electrons, and quenched QCD is QCD without dynamical quarks. Recent calculations typically avoid the quenched approximation.

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  • Quenched approximation (en)
  • Aproximação temperada (pt)
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  • In lattice field theory, the 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 is computationally very difficult in lattice gauge theory. In particular, quenched QED is QED without dynamical electrons, and quenched QCD is QCD without dynamical quarks. Recent calculations typically avoid the quenched approximation. (en)
  • Em física de partículas, aproximação temperada (oriunda do inglês quenched approximation) é uma aproximação frequentemente usada em teoria do retículo gauge na qual os laços (loops) quânticos de férmions nos diagramas de Feynman são negligenciados. De maneira equivalente, os determinantes de um laço correspondentes são estabelecidos com a quantidade de 1. Esta aproximação é frequentemente imposta aos físicos porque o cálculo com os tornam-se relativamente incapazes em teoria do retículo gauge. A maioria dos cálculos recentes evitam a aproximação temperada. (pt)
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  • In lattice field theory, the 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 is computationally very difficult in lattice gauge theory. In particular, quenched QED is QED without dynamical electrons, and quenched QCD is QCD without dynamical quarks. Recent calculations typically avoid the quenched approximation. (en)
  • Em física de partículas, aproximação temperada (oriunda do inglês quenched approximation) é uma aproximação frequentemente usada em teoria do retículo gauge na qual os laços (loops) quânticos de férmions nos diagramas de Feynman são negligenciados. De maneira equivalente, os determinantes de um laço correspondentes são estabelecidos com a quantidade de 1. Esta aproximação é frequentemente imposta aos físicos porque o cálculo com os tornam-se relativamente incapazes em teoria do retículo gauge. A maioria dos cálculos recentes evitam a aproximação temperada. Aplica-se a aproximação temperada nos modelos de quarks, assim como estuda-se a para a aproximação temperada aplicada a cromodinâmica quântica. Estuda-se na aproximação temperada a dispersão na entre a dispersão do comprimento de onda de píons e o volume finito de energia de dois píons resultantes. (pt)
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