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arXiv · 2610.19845

Resolvent Expansions at All Spectral Thresholds for Three-Dimensional Discrete Schrödinger Operators

Yanhong Chen·Sisi Huang·Xiaohua Yao
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Abstract

This paper studies resolvent expansions at all four spectral thresholds for the discrete Schrödinger operator $H=-Δ+V $ on $\Z^3$, where $Δ$ denotes the discrete Laplacian on $\mathbb{Z}^3$ and $V(n)$ is a real-valued decaying potential of $\mathbb{Z}^3$. At the thresholds 0, 4, 8, and 12, we first give a complete classification of the threshold types and derive the corresponding resolvent expansions in weighted $\ell^2$-spaces, including the non-generic cases of resonances and eigenvalues. As a result, we establish the Jensen-Kato type time-decay estimates of the evolution $e^{itH} P_{ac}(H)$ to discrete Schrödinger equations with thresholds singularities on $\Z^3$, with decay $O(t^{-3/2})$ when all thresholds are regular and $O(t^{-1/2})$ otherwise. These results provide a three-dimensional lattice analogue of the Jensen--Kato classical analysis at zero energy threshold on $\mathbb{R}^3$.

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Yanhong Chen, Sisi Huang, Xiaohua Yao. 2026-10-14. Resolvent Expansions at All Spectral Thresholds for Three-Dimensional Discrete Schrödinger Operators. https://arxiv.org/abs/2610.19845

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