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arXiv 2402.01190math.APmath.DGmath.SP
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关于Steklov特征函数的临界点

On the critical points of Steklov eigenfunctions

Luca Battaglia, Angela Pistoia, Luigi Provenzano

AI总结:

该研究针对带边界紧致光滑黎曼流形上的Steklov特征函数临界点,建立通有度量下关联特征函数及其边界限制指标和与流形欧拉示性数的恒等式,给出二维情形内部临界点计数,证明通有度量下Steklov特征函数为Morse函数。

摘要:

我们研究带边界∂M的紧致光滑n维黎曼流形M上Steklov特征函数的临界点。对于M上的 generic(通有)度量,我们建立了一个恒等式,该恒等式关联了Steklov特征函数的指标之和、其在∂M上限制的指标之和以及M的欧拉示性数。在二维情形下,该恒等式可通过M的欧拉示性数与u在∂M上的变号次数,精确计数Steklov特征函数的内部临界点。对于亏格为0的曲面上的第二Steklov特征函数,该恒等式对任意度量均成立。作为主要结果的副产品,我们证明对于M上的通有度量,Steklov特征函数在M中是Morse函数。

英文摘要:

We consider the critical points of Steklov eigenfunctions on a compact, smooth $n$-dimensional Riemannian manifold $M$ with boundary $\partial M$. For generic metrics on $M$ we establish an identity which relates the sum of the indexes of a Steklov eigenfunction, the sum of the indexes of its restriction to $\partial M$, and the Euler characteristic of $M$. In dimension $2$ this identity gives a precise count of the interior critical points of a Steklov eigenfunction in terms of the Euler characteristic of $M$ and of the number of sign changes of $u$ on $\partial M$. In the case of the second Steklov eigenfunction on a genus $0$ surface, the identity holds for any metric. As a by-product of the main result, we show that for generic metrics on $M$ Steklov eigenfunctions are Morse functions in $M$.

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