Abstract
We construct the rank-one, singular (point-like) perturbations of the d-dimensional fractional Laplacian in the physically meaningful norm-resolvent limit of fractional Schrödinger operators with regular potentials centred around the perturbation point and shrinking to a delta-like shape. We analyse both possible regimes, the resonance-driven and the resonance-independent limit, depending on the power of the fractional Laplacian and the spatial dimension. To this aim, we also qualify the notion of zero-energy resonance for Schrödinger operators formed by a fractional Laplacian and a regular potential.
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Communicated by Jussi Behrndt, Fabrizio Colombo, Sergey Naboko.
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This article is part of the topical collection “Spectral Theory and Operators in Mathematical Physics” edited by Jussi Behrndt, Fabrizio Colombo and Sergey Naboko.
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Michelangeli, A., Scandone, R. Point-Like Perturbed Fractional Laplacians Through Shrinking Potentials of Finite Range. Complex Anal. Oper. Theory 13, 3717–3752 (2019). https://doi.org/10.1007/s11785-019-00927-w
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DOI: https://doi.org/10.1007/s11785-019-00927-w
Keywords
- Fractional Laplacian
- Singular perturbations of differential operators
- Schrödinger operators with shrinking potentials
- Resolvent limits
- Zero-energy resonance