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--- advanced_notions:quantum_field_theory:vacuum_expectation_value [2017/12/04 08:01]
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+++ advanced_notions:quantum_field_theory:vacuum_expectation_value [2018/04/08 16:15]
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 Vacuum expectation values are important to describe the [[advanced_notions:symmetry_breaking:higgs_mechanism|Higgs mechanism]] and [[advanced_notions:symmetry_breaking|symmetry breaking]] in general.
-In classical field theory, we are interested in the solutions of the Yang-Mills equations and these correspond to critical points of the [[frameworks:lagrangian_formalism|action]].
+In classical field theory, we are interested in the solutions of the Yang-Mills equations and these correspond to critical points of the [[formalisms:lagrangian_formalism|action]].
 In contrast, in quantum field theory, we use the action to compute "vacuum expectation values" of observables. A vacuum expectation value is the average measured value in the vacuum state. The thing is that many physically interesting quantities can be expressed as vacuum expectation values through various tricks.