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On subordinacy and analysis of the spectrum of Schrödinger operators with two singular endpoints

Published online by Cambridge University Press:  14 November 2011

D. J. Gilbert
Affiliation:
Department of Applied Mathematics, University of Hull, Hull HU6 7RX, U.K.

Synopsis

The theory of subordinacy is extended to all one-dimensional Schrödinger operatorsfor which the corresponding differential expression L = – d2/(dr2) + V(r) is in the limit point case at both ends of an interval (a, b), with V(r) locally integrable. This enables a detailed classification of the absolutely continuous and singular spectra to be established in terms of the relative asymptotic behaviour of solutions of Lu = xu, x εℝ, as ra and rb. The result provides a rigorous but straightforward method of direct spectral analysis which has very general application, and somefurther properties of the spectrum are deduced from the underlying theory.

Type
Research Article
Copyright
Copyright © Royal Society of Edinburgh 1989

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