Charge, Anomalies and Index Theory
In the algebraic approach to quantum theory, due to Haag and others, the primary object is the algebra of observables. Gauge fields, spinor fields and other gauge-dependent quantities, are unobservable and are not primary, but are constructed from the properties of the observables. We explain how this is done.
KeywordsGauge Group Gauge Transformation Gauge Field Spinor Field Axial Current
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