A topological method to compute spectral flow

Details A topological method to compute spectral flow A topological method to compute spectral flow

1997-12-03

arxiv.org/abs/math/9712222v1

Mathematics

Geometric Topology

25 pages

Scientific paper

This paper describes a topological method to compute the spectral flow of a family of twisted Dirac operators, it includes two detailed examples. Briefly, a formula of Atiyah, Patodi and Singer expresses the spectral flow in terms of Chern-Simons invariants and rho invariants. The first step is to construct a flat cobordism to a new bigger 3-manifold. The advantage of the new connection is that it is in the path component of a reducible connection. The second step is to calculate the effect of these operations on the invariants. The final step is an application of the G-signature theorem to compute the invariants.

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