Spectral theory of discontinuous functions of self-adjoint operators and scattering theory

Details Spectral theory of discontinuous functions of self-adjoint operators and scattering theory Spectral theory of discontinuous functions of self-adjoint operators and scattering theory

2009-07-09

arxiv.org/abs/0907.1518v1

Mathematics

Spectral Theory

21 page, Latex

Scientific paper

In the smooth scattering theory framework, we consider a pair of self-adjoint operators $H_0$, $H$ and discuss the spectral projections of these operators corresponding to the interval $(-\infty,\lambda)$. The purpose of the paper is to study the spectral properties of the difference $D(\lambda)$ of these spectral projections. We completely describe the absolutely continuous spectrum of the operator $D(\lambda)$ in terms of the eigenvalues of the scattering matrix $S(\lambda)$ for the operators $H_{0}$ and $H$. We also prove that the singular continuous spectrum of the operator $D(\lambda)$ is empty.

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