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arXiv 1802.08149math-phmath.MP
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周期薛定谔算子谱反问题的均匀化方法

An homogenization approach for the inverse spectral problem of periodic Schrödinger operators

Lorenzo Zanelli

摘要:

研究了具有势$V \in C^{\infty} (\Bbb T^n)$的平坦环面$\Bbb T^n := (\Bbb R / 2 π\Bbb Z)^n$上$- \frac{1}{2} \hbar^2 Δ_x + V(x)$类周期薛定谔算子的逆谱问题.证明了对任意$0 < \hbar \le 1$,若两个算子是等谱算子,则它们具有由Hamilton-Jacobi方程的周期均匀化所给出的相同的有效哈密顿量.这一结果为薛定谔算子的等谱性提供了必要条件。我们还提供了我们的结果与量子可积系统的谱极限之间的联系。

英文摘要:

We study the inverse spectral problem for periodic Schrödinger opera\-tors of kind $- \frac{1}{2} \hbar^2 Δ_x + V(x)$ on the flat torus $\Bbb T^n := (\Bbb R / 2 π\Bbb Z)^n$ with potentials $V \in C^{\infty} (\Bbb T^n)$. We show that if two operators are isospectral for any $0 < \hbar \le 1$ then they have the same effective Hamiltonian given by the periodic homogenization of Hamilton-Jacobi equation. This result provides a necessary condition for the isospectrality of these Schrödinger operators. We also provide a link between our result and the spectral limit of quantum integrable systems.

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