
This article is cited in 1 scientific paper (total in 1 paper)
The Green's function of a fivepoint discretization of a twodimensional finitegap Schrödinger operator: The case of four singular points on the spectral curve
B. O. Vasilevskiĭ^{} ^{} Lomonosov Moscow State University, Faculty of Mechanics and Mathematics, Bogolyubov Laboratory of Geometric Methods in Mathematical Physics, Moscow, Russia
Abstract:
We consider a regular Riemann surface of finite genus and “generalized spectral data”, a special set of distinguished points on it. From them we construct a discrete analog of the Baker–Akhiezer function with a discrete operator that annihilates it. Under some extra conditions on the generalized spectral data, the operator takes the form of the discrete Cauchy–Riemann operator, and its restriction to the even lattice is annihilated by the corresponding Schrödinger operator. In this article we construct an explicit formula for the Green's function of the indicated operator. The formula expresses the Green's function in terms of the integral along a special contour of a differential constructed from the wave function and the extra spectral data. In result, the Green's function with known asymptotics at infinity can be obtained at almost every point of the spectral curve.
Keywords:
discrete operator, finitegap operator, Green’s function, Mcurve.
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Siberian Mathematical Journal, 2013, 54:6, 994–1004
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UDC:
514.84 Received: 04.02.2013
Citation:
B. O. Vasilevskiǐ, “The Green's function of a fivepoint discretization of a twodimensional finitegap Schrödinger operator: The case of four singular points on the spectral curve”, Sibirsk. Mat. Zh., 54:6 (2013), 1250–1262; Siberian Math. J., 54:6 (2013), 994–1004
Citation in format AMSBIB
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G. S. Mauleshova, “The dressing chain and onepoint commuting difference operators of rank 1”, Siberian Math. J., 59:5 (2018), 901–908

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