In theoretical physics, a mixed anomaly is an example of an anomaly: it is an effect of quantum mechanics — usually a one-loop diagram — that implies that the classically valid general covariance and gauge symmetry of a theory of general relativity combined with gauge fields and fermionic fields cannot be preserved simultaneously in the quantum theory.
The adjective "mixed" usually refers to a mixture of a gravitational anomaly and gauge anomaly, but may also refer to a mixture of two different gauge groups tensored together, like the SU(2) and the U(1) of the Standard Model.
The anomaly usually appears as a Feynman diagram with a chiral fermion running in the loop (a polygon) with n−k external gravitons and k external gauge bosons attached to the loop where where is the spacetime dimension. Chiral fermions only occur in even spacetime dimensions. For example, the anomalies in the usual 4 spacetime dimensions arise from triangle Feynman diagrams.
General covariance and gauge symmetries are very important symmetries for the consistency of the whole theory, and therefore all gravitational, gauge, and mixed anomalies must cancel out.
In theoretical physics, a mixedanomaly is an example of an anomaly: it is an effect of quantum mechanics — usually a one-loop diagram — that implies...
up anomaly or anomalous in Wiktionary, the free dictionary. Anomaly may refer to: Anomaly (natural sciences) Atmospheric anomaly Geophysical anomaly Congenital...
In theoretical physics, a gravitational anomaly is an example of a gauge anomaly: it is an effect of quantum mechanics — usually a one-loop diagram—that...
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...
theory. This new anomaly is a mixed gauge-gravitational anomaly and a nonperturbative global anomaly. Many types of global anomalies must cancel for a...
multiple seborrheic keratoses, or tripe palms.: 676 Acral acanthotic anomaly refers to a variant of acanthosis nigricans limited to the elbows, knees...
The Great Salinity Anomaly (GSA) originally referred to an event in the late 1960s to early 1970s where a large influx of freshwater from the Arctic Ocean...
[citation needed] Hematologic anomalies: The presence of mild anemia and hypergammaglobulinemia are common, other hematologic anomalies such as those observed...
a fighter would have had to participate in three matches to win). This anomaly prompted the UFC to change its rules, requiring alternates to win a preliminary...
written “You should have left. Now it’s too late.” Upon discovering an anomaly in the angle between the wall and floor, they measure the kitchen and find...
oceanic or limnological mixed layer is a layer in which active turbulence has homogenized some range of depths. The surface mixed layer is a layer where...
receiving a nomination. Jim Parsons selected the episode "The Pancake Batter Anomaly" as a Primetime Emmy Award submission for Outstanding Lead Actor in a Comedy...
of certain dental anomalies in CLP populations however a variety of results have been obtained. In a study evaluating dental anomalies in Brazilian cleft...
PMID 22244654. Pharoah PO (December 2005). "Causal hypothesis for some congenital anomalies". Twin Research and Human Genetics. 8 (6): 543–550. doi:10.1375/183242705774860141...
the term Mongolism by such designations as 'Langdon Down Anomaly', or 'Down's Syndrome or Anomaly', or 'Congenital Acromicria'. Several of us believe that...
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