arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2101.08930math.CAcs.NAmath.CVmath.NAmath.SP
收藏

从Weyl函数恢复Sturm-Liouville问题的一种实用方法

A practical method for recovering Sturm-Liouville problems from the Weyl function

Vladislav V. Kravchenko, Sergii M. Torba

摘要:

本文提出了一种从可数点集上的Weyl-Titchmarsh $m$ -函数恢复Sturm-Liouville势的直接法。我们表明,使用变形算子积分核的傅里叶-勒让德级数展开的问题减少到一个无限的线性系方程,这是唯一可解的,如果是原来的问题。这个线性系的解决方案允许一个重建的特征行列式,从而获得的特征值作为其零点,并计算相应的赋范常数。结果,原始逆问题被变换为具有给定谱密度函数的逆问题,对于该逆问题,应用来自arXiv:2010.15275的解的直接法。所提出的方法导致一个有效的数值算法求解各种反问题。特别是给出两个谱或三个或更多谱的某些部分的问题,特征值依赖于一个可变边界参数的问题(包括依赖于谱参数的边界条件),部分已知势的问题以及量子图上的部分逆问题。

英文摘要:

In the paper we propose a direct method for recovering the Sturm-Liouville potential from the Weyl-Titchmarsh $m$-function given on a countable set of points. We show that using the Fourier-Legendre series expansion of the transmutation operator integral kernel the problem reduces to an infinite linear system of equations, which is uniquely solvable if so is the original problem. The solution of this linear system allows one to reconstruct the characteristic determinant and hence to obtain the eigenvalues as its zeros and to compute the corresponding norming constants. As a result, the original inverse problem is transformed to an inverse problem with a given spectral density function, for which the direct method of solution from arXiv:2010.15275 is applied. The proposed method leads to an efficient numerical algorithm for solving a variety of inverse problems. In particular, the problems in which two spectra or some parts of three or more spectra are given, the problems in which the eigenvalues depend on a variable boundary parameter (including spectral parameter dependent boundary conditions), problems with a partially known potential and partial inverse problems on quantum graphs.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑