Boundary Data Maps for Schrodinger Operators on a Compact Interval

Details Boundary Data Maps for Schrodinger Operators on a Compact Interval Boundary Data Maps for Schrodinger Operators on a Compact Interval

2010-02-02

arxiv.org/abs/1002.0606v1

Mathematics

Spectral Theory

40 pages

Scientific paper

We provide a systematic study of boundary data maps, that is, 2 \times 2 matrix-valued Dirichlet-to-Neumann and more generally, Robin-to-Robin maps, associated with one-dimensional Schrodinger operators on a compact interval [0,R] with separated boundary conditions at 0 and R. Most of our results are formulated in the non-self-adjoint context. Our principal results include explicit representations of these boundary data maps in terms of the resolvent of the underlying Schrodinger operator and the associated boundary trace maps, Krein-type resolvent formulas relating Schrodinger operators corresponding to different (separated) boundary conditions, and a derivation of the Herglotz property of boundary data maps (up to right multiplication by an appropriate diagonal matrix) in the special self-adjoint case.

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