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- Effective_action abstract "In quantum field theory, the effective action is a modified expression for the action, which takes into account quantum-mechanical corrections, in the following sense:In classical mechanics, the equations of motion can be derived from the action by the principle of stationary action. This is not the case in quantum mechanics, where the amplitudes of all possible motions are added up in a path integral. However, if the action is replaced by the effective action, the equations of motion for the vacuum expectation values of the fields can be derived from the requirement that the effective action be stationary. For example, a field with a potential , at a low temperature, will not settle in a local minimum of , but in a local minimum of the effective potential which can be read off from the effective action.Furthermore, the effective action can be used instead of the action in the calculation of correlation functions, and then only tree diagrams should be taken into account.".
- Effective_action thumbnail FockdiagramZ.png_Image-HartreediagramZ.png?width=300.
- Effective_action wikiPageID "1240093".
- Effective_action wikiPageRevisionID "578036437".
- Effective_action hasPhotoCollection Effective_action.
- Effective_action subject Category:Quantum_field_theory.
- Effective_action comment "In quantum field theory, the effective action is a modified expression for the action, which takes into account quantum-mechanical corrections, in the following sense:In classical mechanics, the equations of motion can be derived from the action by the principle of stationary action. This is not the case in quantum mechanics, where the amplitudes of all possible motions are added up in a path integral.".
- Effective_action label "Ação efetiva".
- Effective_action label "Effective action".
- Effective_action sameAs 유효_작용.
- Effective_action sameAs Ação_efetiva.
- Effective_action sameAs m.04l9nl.
- Effective_action sameAs Q5347246.
- Effective_action sameAs Q5347246.
- Effective_action wasDerivedFrom Effective_action?oldid=578036437.
- Effective_action depiction FockdiagramZ.png_Image-HartreediagramZ.png.
- Effective_action isPrimaryTopicOf Effective_action.
