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arXiv 2603.09705math.DG
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关于单位球面中正各向同性曲率的最小等参超曲面的ACS条件

ACS Condition on Minimal Isoparametric Hypersurfaces of Positive Ricci Curvature in Unit Spheres

Faculty of Arts and Sciences, Beijing Normal University(北京师范大学文理学院)

Niang Chen

AI总结:

本文研究了正各向同性曲率的最小等参超曲面的ACS条件,证明了当主曲率有4种不同取值时,ACS不等式成立当且仅当最小的乘数大于等于4。

摘要:

我们研究了最小等参超曲面$N^{n+1}\subset S^{n+2}$的Ambrozio--Carlotto--Sharp (ACS)准则,受Schoen--Marques--Neves猜想的启发。对于$g=4$种不同的主曲率具有乘数$m_1,m_2$,我们证明了点wise ACS不等式成立当且仅当$\min\{m_1,m_2\}\ge 4$。充分性通过矩松弛技术获得,得到积分被积函数的二次部分的精确界$4a^2$;必要性则来自形状算子最高特征空间中的显式极值配置。我们还验证了$g=3$时,$m_1=m_2\in\{4,8\}$的ACS条件。作为结果,对于任何闭合嵌入的最小超曲面$M^n$在这样的环境 manifold 中,$\operatorname{index}(M)\ge \tfrac{2}{d(d-1)}\, b_1(M)$,其中$d=n+3$。

英文摘要:

We study the Ambrozio--Carlotto--Sharp (ACS) criterion on minimal isoparametric hypersurfaces $N^{n+1}\subset S^{n+2}$ with positive Ricci curvature, motivated by the Schoen--Marques--Neves conjecture on Morse index.For $g=4$ distinct principal curvatures with multiplicities $m_1,m_2$, we prove that the pointwise ACS inequality holds if and only if $\min\{m_1,m_2\}\ge 4$. Sufficiency is obtained via a moment-relaxation technique yielding the sharp bound $4a^2$ on the quadratic part of the integrand; necessity follows from an explicit extremal configuration in the top eigenspace of the shape operator. We also verify the ACS condition for $g=3$ with $m_1=m_2\in\{4,8\}$.As a consequence, for any closed embedded minimal hypersurface $M^n$ in such an ambient manifold, $\operatorname{index}(M)\ge \tfrac{2}{d(d-1)}\, b_1(M)$ with $d=n+3$.

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