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In theoretical physics, a mixed anomaly is an example of an anomaly: it is an effect of quantum mechanics ā usually a one-loop diagram ā 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. The anomaly usually appears as a Feynman diagram with a chiral fermion running in the loop (a polygon) with nāk external gravitons and k external gauge bosons attached to the loop where n = 1 + D / 2 where D is the spacetime dimension. Anomalies occur only 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. This quantum mechanics-related article is a stub. You can help Wikipedia by expanding it.
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Q. My name is Elizabeth Hissim and when I look into the mirror I see myself, but I don t. The person I face is disfigured. She has visible scars on her neck, hands, and underneath deep sunken eyes, not from misadventures of childhood but the cold steel cut of a surgeon s knife, she has unnaturally small unformed ears hidden under honey blond hair, she is someone I don t really know, someone who has faced trials that I find difficult to remember, someone I respect and someone I dread. I have never understood how people, my family and my friends deal with it so well. Sometimes I ll catch myself in a mirror at an angle that makes my whole self constrict, and I always wonder how people deal with me, the opposite of perfection that all of mankind… [cont.] Asked by elm.hissim - Mon Sep 1 21:27:05 2008 - - 1 Answers - 0 Comments A. gritty...check this link. God bless you... Answered by archaea - Mon Sep 1 22:58:51 2008 From Yahoo Answer Search: "Mixed anomaly" |
