The spectral shift function for compactly supported perturbations of Schrödinger operators on large bounded domains

Hislop, Peter; Müller, Peter

doi:10.1090/S0002-9939-10-10264-0

The spectral shift function for compactly supported perturbations of Schrödinger operators on large bounded domains
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by Peter D. Hislop and Peter Müller PDF

Proc. Amer. Math. Soc. 138 (2010), 2141-2150 Request permission

Abstract:

We study the asymptotic behavior as $L \rightarrow \infty$ of the finite-volume spectral shift function for a positive, compactly supported perturbation of a Schrödinger operator in $d$-dimensional Euclidean space, restricted to a cube of side length $L$ with Dirichlet boundary conditions. The size of the support of the perturbation is fixed and independent of $L$. We prove that the Cesàro mean of finite-volume spectral shift functions remains pointwise bounded along certain sequences $L_n \rightarrow \infty$ for Lebesgue-almost every energy. In deriving this result, we give a short proof of the vague convergence of the finite-volume spectral shift functions to the infinite-volume spectral shift function as $L \rightarrow \infty$. Our findings complement earlier results of W. Kirsch [Proc. Amer. Math. Soc. 101, 509–512 (1987); Int. Eqns. Op. Th. 12, 383–391 (1989)], who gave examples of positive, compactly supported perturbations of finite-volume Dirichlet Laplacians for which the pointwise limit of the spectral shift function does not exist for any given positive energy. Our methods also provide a new proof of the Birman–Solomyak formula for the spectral shift function that may be used to express the measure given by the infinite-volume spectral shift function directly in terms of the potential.

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