Anomalies and Schwinger terms in NCG field theory models

TL;DR

This paper investigates the quantization of chiral fermions in noncommutative geometry, focusing on anomalies, cocycles, and locality principles, with applications to noncommutative tori and a gerbe-theoretic approach to chiral anomalies.

Contribution

It introduces a generalized locality principle for cocycles in NCG field theories and applies it to noncommutative tori, advancing the understanding of anomalies and Schwinger terms.

Findings

Calculation of cocycles describing chiral symmetry breaking.

Introduction of a generalized locality principle for cocycles.

Development of a gerbe theoretic approach to chiral anomalies.

Abstract

We study the quantization of chiral fermions coupled to generalized Dirac operators arising in NCG Yang-Mills theory. The cocycles describing chiral symmetry breaking are calculated. In particular, we introduce a generalized locality principle for the cocycles. Local cocycles are by definition expressions which can be written as generalized traces of operator commutators. In the case of pseudodifferential operators, these traces lead in fact to integrals of ordinary local de Rham forms. As an application of the general ideas we discuss the case of noncommutative tori. We also develop a gerbe theoretic approach to the chiral anomaly in hamiltonian quantization of NCG field theory.