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Anomalies in Quantum Field Theory$
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Reinhold A. Bertlmann

Print publication date: 2000

Print ISBN-13: 9780198507628

Published to Oxford Scholarship Online: January 2010

DOI: 10.1093/acprof:oso/9780198507628.001.0001

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Chern–Simons form, homotopy operator and anomaly

Chern–Simons form, homotopy operator and anomaly

Chapter:
(p.321) 7 Chern–Simons form, homotopy operator and anomaly
Source:
Anomalies in Quantum Field Theory
Author(s):

Reinhold A. Bertlmann

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780198507628.003.0007

The Chern–Simons form and the homotopy operator plays an important role in connection with anomalies. In fact, the anomaly can be calculated on pure algebraic grounds from a variation of the Chern–Simons form using a homotopy operator. This chapter begins with a discussion of a symmetric invariant polynomial of fields, which is the starting point for deriving the Chern–Simons form and ‘transgression formula’. It then proves the important Poincaré lemma and introduces in this connection a homotopy operator. A generalization of the ‘transgression’ — the Cartan homotopy formula — follows. The homotopy formula is applied to a Chern–Simons form with gauge transformed fields, and the non-Abelian anomaly is derived in this way. Finally, the chapter presents a general formula for the variation of the Chern–Simons form, which expresses the anomaly.

Keywords:   Chern–Simons form, anomalies, non-Abelian anomaly, Cartan homotopy formula, transgression formula

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