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arXiv 2008.07400math.APmath-phmath.MPmath.NTmath.SP
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Robin和Neumann特征值的区别

Differences between Robin and Neumann eigenvalues

Zeev Rudnick, Igor Wigman, Nadav Yesha

摘要:

设$Ω\subset \mathbb R^2$是一个有界平面区域,其边界$\partial Ω$是分段光滑的.对于$σ>0$,我们考虑Robin边值问题\[ -Δf =λf, \qquad \frac{\partial f}{\partial n} + σf = 0 \mbox{ on } \partial Ω\],其中$ \frac{\partial f}{\partial n} $是指向外的$\partial Ω$法线方向的导数.令$0<λ^σ_0\leq λ^σ_1\leq \dots $为相应的特征值。本文的目的是研究Robin-Neumann间隙\[ d_n(σ):=λ_n^σ-λ_n^0 . \]对于广泛的一类平面区域,我们证明了存在一个极限平均值,等于$2{\rm length}(\partialΩ)/{\rm area}(Ω)\cdot σ$,并在光滑的情况下,给出了$d_n(σ)\leq C(Ω) n^{1/3}σ$的一个上界和一个一致的下界.对于遍历台球,我们表明,沿着密度为1的子序列,差距收敛到平均值。我们得到进一步的矩形,我们有一个统一的上限,并为磁盘,我们提高了一般的上限的属性。

英文摘要:

Let $Ω\subset \mathbb R^2$ be a bounded planar domain, with piecewise smooth boundary $\partial Ω$. For $σ>0$, we consider the Robin boundary value problem \[ -Δf =λf, \qquad \frac{\partial f}{\partial n} + σf = 0 \mbox{ on } \partial Ω\] where $ \frac{\partial f}{\partial n} $ is the derivative in the direction of the outward pointing normal to $\partial Ω$. Let $0<λ^σ_0\leq λ^σ_1\leq \dots $ be the corresponding eigenvalues. The purpose of this paper is to study the Robin-Neumann gaps \[ d_n(σ):=λ_n^σ-λ_n^0 . \] For a wide class of planar domains we show that there is a limiting mean value, equal to $2{\rm length}(\partialΩ)/{\rm area}(Ω)\cdot σ$ and in the smooth case, give an upper bound of $d_n(σ)\leq C(Ω) n^{1/3}σ$ and a uniform lower bound. For ergodic billiards we show that along a density-one subsequence, the gaps converge to the mean value. We obtain further properties for rectangles, where we have a uniform upper bound, and for disks, where we improve the general upper bound.

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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