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arXiv 2610.13601math.SPmath-phmath.APmath.MP
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Robin特征值问题中的非共振角

Non-resonant angles in a Robin eigenvalue problem

Carl von Ossietzky Universität Oldenburg(奥尔登堡卡尔·冯·奥西茨基大学)

Konstantin Pankrashkin

AI总结:

该研究确定了Robin特征值问题中非共振角的完整范围,解决了Dauge与Lafranche提出的经数值支持的猜想,明确了临界角的表征方式。

摘要:

在一项关于多边形上具有强吸引Robin边界条件的拉普拉斯算子特征值的早期研究中,研究人员发现,若每个角要么是凹角,要么是非共振角,则单个特征值的渐近行为由边界上的有效一维算子决定,该算子在角点处具有Dirichlet边界条件。非共振条件是根据截断扇形区域的特征值界来表述的,且仅证明了该条件在直角和钝角时成立。在本研究中,我们确定了非共振角的完整范围:结果表明,非共振条件仅在开口角为π/(2n+1)(n=1,2,3,…)时不成立,这些临界值可通过特征值计数函数的跳跃以及有界广义特征函数的存在性来等价表征。这解决了Dauge和Lafranche提出的经数值支持的猜想。

英文摘要:

In an earlier study of the Laplacian eigenvalues with strongly attractive Robin boundary conditions in polygons it was found that if each corner is either concave or non-resonant, then the asymptotic behavior of the individual eigenvalues is determined by an effective one-dimensional operator on the boundary with Dirichlet boundary conditions at the corners. The non-resonance condition was formulated in terms of an eigenvalue bound on truncated sectors, and it was only shown to be satisfied by the right and obtuse opening angles. In the present work, we determine the full range of non-resonant angles: it turns out that the non-resonance condition fails only for the opening angles $\fracπ{2n+1}$ with $n=1,2,3,\dots$, and these critical values are equivalently characterized in terms of the jumps of the eigenvalue counting function and the existence of bounded generalized eigenfunctions. This resolves the numerically supported conjecture stated by Dauge and Lafranche.

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