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About: Gauge anomaly     Goto   Sponge   NotDistinct   Permalink

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Type: yago:WikicatAnomaliesInPhysicsyago:Abnormality114501726yago:Abstraction100002137yago:Anomaly114505821yago:Attribute100024264yago:Condition113920835yago:PhysicalCondition114034177buildingyago:State100024720 New Facet based on Instances of this Class

In theoretical physics, a gauge anomaly is an example of an anomaly: it is a feature of quantum mechanics—usually a one-loop diagram—that invalidates the gauge symmetry of a quantum field theory; i.e. of a gauge theory. All gauge anomalies must cancel out. Anomalies in gauge symmetries lead to an inconsistency, since a gauge symmetry is required in order to cancel degrees of freedom with a negative norm which are unphysical (such as a photon polarized in the time direction). Indeed, cancellation occurs in the Standard Model.