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arXiv 1807.09653math.CAmath.SP
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具有分布系数的常微分方程组的Spectral Theory

Spectral Theory for Systems of Ordinary Differential Equations with Distributional Coefficients

Ahmed Ghatasheh, Rudi Weikard

摘要:

研究实区间$(a,b)$上一阶微分方程组$Ju'+qu=wf$的谱理论,其中$J$是一个常数可逆的斜埃尔米特矩阵,$q$和$w$是元素为零阶分布且$q$和$w$非负的矩阵.此外,我们不构成的确定性条件通常所需的系数的方程。具体地说,我们构造了最小和最大关系,并研究了最大关系的自伴限制。对于这些,我们确定格林函数,并证明存在的频谱(或广义傅立叶)变换。我们有一个更仔细地看看特殊情况下,当区间$(a,b)$的端点是定期以及$2\times2$系统的情况。两个附录提供了必要的细节分布秩序零和抽象的谱理论的关系。

英文摘要:

We study the spectral theory for the first-order system $Ju'+qu=wf$ of differential equations on the real interval $(a,b)$ when $J$ is a constant, invertible skew-Hermitian matrix and $q$ and $w$ are matrices whose entries are distributions of order zero with $q$ Hermitian and $w$ non-negative. Also, we do not pose the definiteness condition customarily required for the coefficients of the equation. Specifically, we construct minimal and maximal relations, and study self-adjoint restrictions of the maximal relation. For these we determine Green's function and prove the existence of a spectral (or generalized Fourier) transformation. We have a closer look at the special cases when the endpoints of the interval $(a,b)$ are regular as well as the case of a $2\times2$ system. Two appendices provide necessary details on distributions of order zero and the abstract spectral theory for relations.

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。

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