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arXiv math-ph/0311036math-phmath.MP
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二维半离散和离散双曲Schroedinger算子的Laplace变换和谱理论

Laplace transformations and spectral theory of two-dimensional semi-discrete and discrete hyperbolic Schroedinger operators

Alexei A. Oblomkov, Alexei V. Penskoi

摘要:

介绍了二维半离散双曲型Schroedinger算子的Laplace变换,并证明了它们与半离散二维Toda格的关系。我们发展了二维半离散双曲Schroedinger算子的代数几何谱理论,并解决了二维离散双曲Schroedinger算子的正谱问题(离散算子的反问题已由Krichever解决).利用谱理论研究了这些算子的Laplace变换的谱性质。这使得它有可能找到解决方案的半离散和离散的二维Toda格的θ函数。

英文摘要:

We introduce Laplace transformations of 2D semi-discrete hyperbolic Schroedinger operators and show their relation to a semi-discrete 2D Toda lattice. We develop the algebro-geometric spectral theory of 2D semi-discrete hyperbolic Schroedinger operators and solve the direct spectral problem for 2D discrete ones (the inverse problem for discrete operators was already solved by Krichever). Using the spectral theory we investigate spectral properties of the Laplace transformations of these operators. This makes it possible to find solutions of the semi-discrete and discrete 2D Toda lattices in terms of theta-functions.

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