Continuum limit of resonances for discrete Schrödinger operators
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866912084206288896 |
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| author | Kameoka, Kentaro Nakamura, Shu |
| author_facet | Kameoka, Kentaro Nakamura, Shu |
| contents | We consider complex resonances for discrete and continuous Schrödinger operators, and we show that the resonances of discrete models converge to resonances of continuous models in the continuum limit. The potential is supposed to be a sum of an exterior dilation analytic function and an exponentially decaying function, which may have local singularities. The proof employs a generalization of the norm resolvent convergence of discrete Schrödinger operators by Nakamura and Tadano (2021), combined with the complex distortion method in the Fourier space. Our results confirm that the complex resonances can be approximately computed using discrete Schrödinger operators. We also give a recipe for the construction of approximate discrete operators for Schrödinger operators with singular potentials. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2410_18480 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Continuum limit of resonances for discrete Schrödinger operators Kameoka, Kentaro Nakamura, Shu Mathematical Physics Analysis of PDEs Spectral Theory 81Q35, 81U24, 47A58, 47A10 We consider complex resonances for discrete and continuous Schrödinger operators, and we show that the resonances of discrete models converge to resonances of continuous models in the continuum limit. The potential is supposed to be a sum of an exterior dilation analytic function and an exponentially decaying function, which may have local singularities. The proof employs a generalization of the norm resolvent convergence of discrete Schrödinger operators by Nakamura and Tadano (2021), combined with the complex distortion method in the Fourier space. Our results confirm that the complex resonances can be approximately computed using discrete Schrödinger operators. We also give a recipe for the construction of approximate discrete operators for Schrödinger operators with singular potentials. |
| title | Continuum limit of resonances for discrete Schrödinger operators |
| topic | Mathematical Physics Analysis of PDEs Spectral Theory 81Q35, 81U24, 47A58, 47A10 |
| url | https://arxiv.org/abs/2410.18480 |