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arXiv 2103.07747math.DG
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极小超曲面上第二基本型的$L_2$长度的一个下界

A lower bound for $L_2$ length of second fundamental form on minimal hypersurfaces

Jianquan Ge, Fagui Li

摘要:

本文证明了Perdomo猜想的一个弱版本,即存在一个仅依赖于$n$的正常数$δ(n)>0$,使得在$δ(n)>0$中的任意闭嵌入的、非全测地的极小超曲面$M^n$上,$$\int_{M}S \geq δ(n){\rm Vol}(M^n),$$,其中$S$是$M^n$的第二基本型的长度平方. Perdomo猜想断言$δ(n)=n$仍然是开放的。作为副产品,我们还得到了一些积分不等式和封闭嵌入(或浸入)极小超曲面上的Simons-型pinching结果,其中涉及Laplacian的第一正特征值$λ_1(M)$。

英文摘要:

We prove a weak version of the Perdomo Conjecture, namely, there is a positive constant $δ(n)>0$ depending only on $n$ such that on any closed embedded, non-totally geodesic, minimal hypersurface $M^n$ in $\mathbb{S}^{n+1}$, $$\int_{M}S \geq δ(n){\rm Vol}(M^n),$$ where $S$ is the squared length of the second fundamental form of $M^n$. The Perdomo Conjecture asserts that $δ(n)=n$ which is still open in general. As byproducts, we also obtain some integral inequalities and Simons-type pinching results on closed embedded (or immersed) minimal hypersurfaces, with the first positive eigenvalue $λ_1(M)$ of the Laplacian involved.

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