Abstract
In this paper we study point perturbations of the Schrödinger operators within the framework of Krein's theory of self-adjoint extensions. A locality criterion for quadratic forms is proved for such perturbations.
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Pankrashkin, K.V. Locality of Quadratic Forms for Point Perturbations of Schrödinger Operators. Mathematical Notes 70, 384–391 (2001). https://doi.org/10.1023/A:1012352029965
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DOI: https://doi.org/10.1023/A:1012352029965