Noncommutative circle bundles and new Dirac operators

Details Noncommutative circle bundles and new Dirac operators Noncommutative circle bundles and new Dirac operators

2010-12-14

arxiv.org/abs/1012.3055v2

Physics

Mathematical Physics

25 pages, LaTeX, substantially rewritten

Scientific paper

We study spectral triples over noncommutative principal U(1) bundles. Basing on the classical situation and the abstract algebraic approach, we propose an operatorial definition for a connection and compatibility between the connection and the Dirac operator on the total space and on the base space of the bundle. We analyze in details the example of the noncommutative three-torus viewed as a U(1) bundle over the noncommutative two-torus and find all connections compatible with an admissible Dirac operator. Conversely, we find a family of new Dirac operators on the noncommutative tori, which arise from the base-space Dirac operator and a suitable connection.

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