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arXiv 1209.3789math.DG
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球的eigenvalue界和极小曲面

Sharp eigenvalue bounds and minimal surfaces in the ball

Ailana Fraser, Richard Schoen

摘要:

本文证明了具有边界的曲面上度量的存在性和正则性,其中σ_1是第一个非零Steklov特征值,L是边界长度。我们证明了当n为一定值时,这种度量作为单位球B^n中自由边界极小曲面上的诱导度量出现。在环的情况下,我们证明了这个问题的唯一解是临界悬链面上的诱导度规,临界悬链面是B^3中唯一的自由自由边界曲面。我们还表明,唯一的解决方案的莫比乌斯带是通过一个明确的S^1不变嵌入B^4作为一个自由边界表面,临界莫比乌斯带。对于亏格为0且具有任意多个边界分支的定向曲面,我们证明了由B^3中的极小嵌入给出的极大化子的存在性。我们将极限刻画为边界分量的数目趋于无穷大,从而给出4 π的渐近尖锐的上界。我们还证明了sigma_1在拓扑意义下的重数界,并给出了球内自由边界曲面面积泛函Morse指标的下界.

英文摘要:

We prove existence and regularity of metrics on a surface with boundary which maximize sigma_1 L where sigma_1 is the first nonzero Steklov eigenvalue and L the boundary length. We show that such metrics arise as the induced metrics on free boundary minimal surfaces in the unit ball B^n for some n. In the case of the annulus we prove that the unique solution to this problem is the induced metric on the critical catenoid, the unique free boundary surface of revolution in B^3. We also show that the unique solution on the Mobius band is achieved by an explicit S^1 invariant embedding in B^4 as a free boundary surface, the critical Mobius band. For oriented surfaces of genus 0 with arbitrarily many boundary components we prove the existence of maximizers which are given by minimal embeddings in B^3. We characterize the limit as the number of boundary components tends to infinity to give the asymptotically sharp upper bound of 4pi. We also prove multiplicity bounds on sigma_1 in terms of the topology, and we give a lower bound on the Morse index for the area functional for free boundary surfaces in the ball.

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