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In theoretical physics, a gauge anomaly is an example of an anomaly: it is an effect of quantum mechanics—usually a one-loop diagram—that invalidates the gauge symmetry of a quantum field theory; i.e. of a gauge theory. Anomalies in gauge symmetries lead to an inconsistency, since a gauge symmetry is required in order to cancel unphysical degrees of freedom with a negative norm (such as a photon polarized in the time direction). Therefore all gauge anomalies must cancel out. This indeed happens in the Standard Model. The term gauge anomaly is usually used for vector gauge anomalies. Another type of gauge anomaly is the gravitational anomaly, because reparametrization is a gauge symmetry in gravitation. From Wikipedia under the
GNU Free Documentation License  marcofrasca.wordpress.com mfrasca Sat, 30 May 2009 09:46:18 GM Abstract: We uncover a novel solution of the 't Hooft . anomaly. matching conditions for QCD. Interestingly in the perturbative regime the new . gauge. theory, if interpreted as a possible QCD dual, predicts the critical number of flavors ...  link.aps.org Jeffrey A. Harvey, Christopher T. Hill, and Richard J. Hill hu, 17 Apr 2008 04:00:00 GM Terms with two A's and two B's are y 3i TrA2 BR BL y BL BR : (39) Equations (38) and (39) combine into the . gauge. -invariant expression, 3 TrdA y iA2 BR BL y BL BR : (40) is now . gauge anomaly. free in the presence of the NGB's, . gauge. ... link.aps.org F. Bezrukov, Y. Burnier and M. Shaposhnikov hu, 09 Feb 2006 05:00:00 GM The model is free of . gauge anomaly. . There is, however, a chiral . anomaly. leading to nonconservation of fermionic current, l r j j j ; These configurations will be called bosonic vacua. In infinite space, or in finite space with ... From Google Blog Search: "Gauge anomaly" |
