On a formula for the spectral flow and its applications

Details On a formula for the spectral flow and its applications On a formula for the spectral flow and its applications

2008-01-26

arxiv.org/abs/0801.4102v1

Mathematics

Functional Analysis

28 pages

Scientific paper

We consider a continuous path of bounded symmetric Fredholm bilinear forms with arbitrary endpoints on a real Hilbert space, and we prove a formula that gives the spectral flow of the path in terms of the spectral flow of the restriction to a finite codimensional closed subspace. We also discuss the case of restrictions to a continuous path of finite codimensional closed subspaces. As an application of the formula, we introduce the notion of spectral flow for a periodic semi-Riemannian geodesic, and we compute its value in terms of the Maslov index.

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