翘曲积流形上Steklov本征函数的指数局部化：象上跳蚤现象
Exponential localization of Steklov eigenfunctions on warped product manifolds: the flea on the elephant phenomenon
摘要：
本文研究了一类翘曲积黎曼流形$(M,g)$上的Steklov特征值和Steklov特征函数的分析，该流形的边界$\partial M$由两个不同的连通分支$Γ_0$和$Γ_1$组成.首先，我们证明了Steklov特征值可以分为两个家庭$(λ_m^\pm)_{m \geq 0}$满足精确的渐近为$m \to \infty$。其次，我们考虑了相关的Steklov本征函数，这是边界Dirichlet到Neumann本征函数的调和扩展。在对称翘曲积的情形下，我们证明了Steklov特征函数是指数局部化在整个边界$\partial M$上的$m \to \infty$ .每当我们在对称扭曲的乘积上加上一个非对称扰动时，我们就会观察到大象上的跳蚤效应。粗略地说，我们证明了“一半”的Steklov本征函数是指数本地化的一个连接组件的边界，说$Γ_0$，和另一半上的其他连接组件$Γ_1$作为$m \to \infty$。
英文摘要：
This paper is devoted to the analysis of Steklov eigenvalues and Steklov eigenfunctions on a class of warped product Riemannian manifolds $(M,g)$ whose boundary $\partial M$ consists in two distinct connected components $Γ_0$ and $Γ_1$. First, we show that the Steklov eigenvalues can be divided into two families $(λ_m^\pm)_{m \geq 0}$ which satisfy accurate asymptotics as $m \to \infty$. Second, we consider the associated Steklov eigenfunctions which are the harmonic extensions of the boundary Dirichlet to Neumann eigenfunctions. In the case of symmetric warped product, we prove that the Steklov eigenfunctions are exponentially localized on the whole boundary $\partial M$ as $m \to \infty$. Whenever we add an asymmetric perturbation to a symmetric warped product, we observe a flea on the elephant effect. Roughly speaking, we prove that "half" the Steklov eigenfunctions are exponentially localized on one connected component of the boundary, say $Γ_0$, and the other half on the other connected component $Γ_1$ as $m \to \infty$.
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