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arXiv 1709.06326math.SPmath.FA
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具有显式eigenvalue渐近性的Helson矩阵

A Helson matrix with explicit eigenvalue asymptotics

Nazar Miheisi, Alexander Pushnitski

摘要:

Helson矩阵(也称为乘法Hankel矩阵)是一个无限矩阵,其元素为$j,k\geq1$,元素为$\{a(jk)\}$。这里,第$(j,k)$项取决于乘积$jk$。本文研究了一类特殊序列$a(j)=(\sqrt{j}\log j(\log\log j)^α))^{-1}$的自伴Helson矩阵$j\geq 3$,其中$α>0$,证明了它是紧的,其特征值服从渐近性$λ_n\sim\varkappa(α)/n^α$为$n\to\infty$,且具有显式常数$\varkappa(α)$ .我们还建立了一些中间结果(一个独立的利益),它给出了一个连接之间的谱性质的Helson矩阵和它的连续模拟,我们称之为积分Helson运营商。

英文摘要:

A Helson matrix (also known as a multiplicative Hankel matrix) is an infinite matrix with entries $\{a(jk)\}$ for $j,k\geq1$. Here the $(j,k)$'th term depends on the product $jk$. We study a self-adjoint Helson matrix for a particular sequence $a(j)=(\sqrt{j}\log j(\log\log j)^α))^{-1}$, $j\geq 3$, where $α>0$, and prove that it is compact and that its eigenvalues obey the asymptotics $λ_n\sim\varkappa(α)/n^α$ as $n\to\infty$, with an explicit constant $\varkappa(α)$. We also establish some intermediate results (of an independent interest) which give a connection between the spectral properties of a Helson matrix and those of its continuous analogue, which we call the integral Helson operator.

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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