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arXiv 1602.07448math.SP
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锥域上Robin Laplacian的Eigenvalue计数函数

Eigenvalue counting function for Robin Laplacians on conical domains

Vincent Bruneau, Konstantin Pankrashkin, Nicolas Popoff

摘要:

本文研究了Robin Laplacian $Q^Ω_α$在$L^2(Ω)$,\[ u\mapsto -Δu, \quad \dfrac{\partial u}{\partial n}=αu \text{ on }\partialΩ, \]中的离散谱,其中$Ω\subset \mathbb{R}^{3}$是一个具有规则截面的圆锥区域,$Θ\subset \mathbb{S}^2$,$n$是外单位法线,$α>0$是一个固定常数.从以前的论文中可以知道,$Q^Ω_α$的本质谱的底部是$-α^2$,并且离散谱的有限性取决于截面的几何形状。我们表明,$Q^Ω_α$的离散谱的积累是由一个有效的哈密顿定义在边界上,远离原点的离散谱。通过研究这个模型算子,我们证明了$Q^Ω_α$在$(-\infty,-α^2-λ)$中的特征值个数,其中$λ>0$,对于$λ\to0$表现为\[ \dfrac{α^2}{8πλ} \int_{\partialΘ} κ_+(s)^2d s +o\left(\frac{1}λ\right), \],其中$κ_+$是横截面边界的测地曲率的正部分.

英文摘要:

We study the discrete spectrum of the Robin Laplacian $Q^Ω_α$ in $L^2(Ω)$, \[ u\mapsto -Δu, \quad \dfrac{\partial u}{\partial n}=αu \text{ on }\partialΩ, \] where $Ω\subset \mathbb{R}^{3}$ is a conical domain with a regular cross-section $Θ\subset \mathbb{S}^2$, $n$ is the outer unit normal, and $α>0$ is a fixed constant. It is known from previous papers that the bottom of the essential spectrum of $Q^Ω_α$ is $-α^2$ and that the finiteness of the discrete spectrum depends on the geometry of the cross-section. We show that the accumulation of the discrete spectrum of $Q^Ω_α$ is determined by the discrete spectrum of an effective Hamiltonian defined on the boundary and far from the origin. By studying this model operator, we prove that the number of eigenvalues of $Q^Ω_α$ in $(-\infty,-α^2-λ)$, with $λ>0$, behaves for $λ\to0$ as \[ \dfrac{α^2}{8πλ} \int_{\partialΘ} κ_+(s)^2d s +o\left(\frac{1}λ\right), \] where $κ_+$ is the positive part of the geodesic curvature of the cross-section boundary.

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