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- W4288093442 abstract "The spectral flow is a well-known quantity in spectral theory that measures the variation of spectra about $0$ along paths of selfadjoint Fredholm operators. The aim of this work is twofold. Firstly, we consider homotopy invariance properties of the spectral flow and establish a simple formula which comprises its classical homotopy invariance and yields a comparison theorem for the spectral flow under compact perturbations. We apply our result to the existence of non-trivial solutions of boundary value problems of Hamiltonian systems. Secondly, the spectral flow was axiomatically characterised by Lesch, and by Ciriza, Fitzpatrick and Pejsachowicz under the assumption that the endpoints of the paths of selfadjoint Fredholm operators are invertible. We propose a different approach to the uniqueness of spectral flow which lifts this additional assumption. As application of the latter result, we discuss the relation between the spectral flow and the Maslov index in symplectic Hilbert spaces." @default.
- W4288093442 created "2022-07-28" @default.
- W4288093442 creator A5037832446 @default.
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- W4288093442 date "2019-10-11" @default.
- W4288093442 modified "2023-10-18" @default.
- W4288093442 title "On a Comparison Principle and the Uniqueness of Spectral Flow" @default.
- W4288093442 doi "https://doi.org/10.48550/arxiv.1910.05183" @default.
- W4288093442 hasPublicationYear "2019" @default.
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