Jaigyoung Choe, Jens Hoppe
The Clifford torus is a product surface in $\mathbb S^3$ and it is helicoidal. It will be shown that more minimal submanifolds of $\mathbb S^n$ have these properties.
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Extrinsically Symmetric Spaces, Submanifolds of Clifford Type and a Theorem of Harish-Chandra
本文证明欧氏空间中紧致内在对称子流形为外在对称当且仅当其极大环面为Clifford环面，并以此给出Harish-Chandra定理的几何证明。
Our goal is to generalize the Choe-Hoppe helicoid and Clifford cones in Euclidean space. By sweeping out $L$ indpendent Clifford cones in ${\mathbb{R}}^{2N+2}$ via the multi-screw motion, we construct minimal submanifolds in ${\mathbb{R}}^{L(2N+2)+1}$. Also, we sweep out the $L$-rays Clifford cone (introduced in Section 2.3) in ${\mathbb{R}}^{L(2N+2)}$ to construct minimal submanifolds in ${\mathbb{R}}^{L(2N+2)+1}$. Our minimal submanifolds unify various interesting examples: Choe-Hoppe's helicoid of codimension one, cone over Lawson's ruled minimal surfaces in ${\mathbb{S}}^{3}$, Barbosa-Dajc…
We construct biharmonic real hypersurfaces and Lagrangian submanifolds of Clifford torus type in $CP^n$ via the Hopf fibration; and get new examples of biharmonic submanifolds in $S^{2n+1}$ as byproducts .
We introduce the notion of even Clifford structures on Riemannian manifolds, a framework generalizing almost Hermitian and quaternion-Hermitian geometries. We give the complete classification of manifolds carrying parallel even Clifford structures: Kähler, quaternion-Kähler and Riemannian products of quaternion-Kähler manifolds, several classes of 8-dimensional manifolds, families of real, complex and quaternionic Grassmannians, as well as Rosenfeld's elliptic projective planes, which are symmetric spaces associated to the exceptional simple Lie groups. As an application, we classify all Riema…
The famous theorems of Cartan, related to the axiom of $r$-planes, and Leung-Nomizu about the axiom of $r$-spheres were extended to Kähler geometry by several authors. In this paper we replace the strong notions of totally geodesic submanifolds ($r$-planes) and extrinsic spheres ($r$-spheres) by a wider class of special isometric immersions such that theorems of type "axioms of $r$-special submanifolds" could hold. We verify also that there are plenty of special submanifolds in real and complex space forms and, in the codimension one case, in Einstein manifolds.
First eigenvalue characterization of Clifford hypersurfaces and Veronese surface
本文研究了单位球面中闭极小超曲面上薛定谔算子的第一特征值估计，并利用该估计刻画了Clifford超曲面与Veronese曲面。
Morse index of minimal products of minimal submanifolds in spheres
该研究针对球面极小子流形的Clifford型极小乘积，证明其由拉普拉斯第一特征函数浸入的充要条件，给出Morse指数与零化度估计，并得到Clifford极小子流形的对应精确值。
An optimal pinching theorem on compact minimal submanifolds in the Euclidean spheres via eigenvalues of fundamental matrices
通过基本矩阵特征值，建立了欧氏球面中紧致极小子流形的最优刚性定理，不限制余维数，并给出广义克利福德环面和韦罗内塞流形的新刻画。
Minimal submanifolds in spheres and complex-valued eigenfunctions
本研究提出构造常曲率球面中余维1极小子流形的新方法，用$(\lambda,\mu)$-本征函数描述三维球面中克利福德环面的两种浸入与所有Lawson $\tau_{n,m}$曲面，并给出球面上$(\lambda,\mu)$-本征函数相关定理的新证明。
An optimal pinching theorem on compact minimal submanifolds in the Euclidean spheres via eigenvalues of fundamental matrices II
针对单位球面中的紧致极小子流形，利用其基本矩阵的特征值，证明了满足特定挤压条件时该子流形必为全测地子球面、广义Clifford环面或Veronese流形，并完成了等号情形的分类。
Let $(Z,ω)$ be a connected Kahler manifold with an holomorphic action of the complex reductive Lie group $U^{\mathbb C}$, where $U$ is a compact connected Lie group acting in a hamiltonian fashion. Let $G$ be a closed compatible Lie group of $U^{\mathbb C}$ and let $M$ be a $G$-invariant connected submanifold of $Z$. Let $x\in M$. If $G$ is a real form of $U^{\mathbb C}$, we investigate conditions such that $G\cdot x$ compact implies $U^{\mathbb C} \cdot x$ is compact as well. The vice-versa is also investigated. We also characterize $G$-invariant real submanifolds such that the norm square of…
Sharp pinching theorems for complete submanifolds in the sphere
本文利用共形方法将球面中极小浸入子流形及常平均曲率超曲面的经典紧致夹挤定理推广至完备情形，并给出了第二基本形式或脐张量在最优界下的精确分类结果。
In this paper, two sequences of minimal isoparametric hypersurfaces are constructed via representations of Clifford algebras. Based on these, we give estimates on eigenvalues of the Laplacian of the focal submanifolds of isoparametric hypersurfaces in unit spheres. This improves results of [TY13] and [TXY14]. Eells and Lemaire [EL83] posed a problem to characterize the compact Riemannian manifold M for which there is an eigenmap from M to S^n. As another application of our constructions, the focal maps give rise to many examples of eigenmaps from minimal isoparametric hypersurfaces to unit sph…
On Chern's Conjecture for Minimal Submanifolds with Flat Normal Bundle in Spheres
研究单位球中具有平坦法丛的闭极小浸入子流形，通过证明关于其第二基本形式平方范数 \(S\) 的第二间隙刚性定理，在特定条件下确定 \(S\) 的取值，为高余维的陈省身猜想提供了正面证据。
Let $P$ be a submanifold properly immersed in a rotationally symmetric manifold having a pole and endowed with a weight $e^h$. The aim of this paper is twofold. First, by assuming certain control on the $h$-mean curvature of $P$, we establish comparisons for the $h$-capacity of extrinsic balls in $P$, from which we deduce criteria ensuring the $h$-parabolicity or $h$-hyperbolicity of $P$. Second, we employ functions with geometric meaning to describe submanifolds of bounded $h$-mean curvature which are confined into some regions of the ambient manifold. As a consequence, we derive half-space a…
Volume gap for minimal submanifolds in spheres
研究单位球中闭极小曲面\(f:M^n\looparrowright \mathbb{S}^{N}\)，证明了相关体积不等式，给出等式成立条件。通过应用验证了Yau猜想非嵌入情形，还得到常数量曲率极小超曲面体积间隙及其他体积间隙和相关挤压刚性。
The Clifford tori in the 3-sphere are a one-parameter family of flat, two-dimensional, constant mean curvature (CMC) surfaces. This paper demonstrates that new, topologically non-trivial CMC surfaces resembling a pair of neighbouring Clifford tori connected at a sub-lattice consisting of at least two points by small catenoidal bridges can be constructed by perturbative PDE methods. That is, one can create an approximate solution by gluing a rescaled catenoid into the neighbourhood of each sub-lattice point; and then one can show that a perturbation of this approximate submanifold exists which …
A Gauss-Bonnet formula for the renormalized area of minimal submanifolds of Poincaré-Einstein manifolds
本文证明偶维极小子流形在 Poincaré-Einstein 流形中的重整化面积可由欧拉示性数与共形不变量积分线性表示，并在二维和四维验证了外在 Q-曲率的分解猜想。
In Part I of this article we generalize the Linearized Doubling (LD) approach, introduced in earlier work by NK, by proving a general theorem stating that if $Σ$ is a closed minimal surface embedded in a Riemannian three-manifold $(N,g)$ and its Jacobi operator has trivial kernel, then given a suitable family of LD solutions on $Σ$, a minimal surface $\breve{M}$ resembling two copies of $Σ$ joined by many small catenoidal bridges can be constructed by PDE gluing methods. (An LD solution $φ$ on $Σ$ is a singular solution of the Jacobi equation with logarithmic singularities which in the constru…
A dichotomy for minimal submanifolds
本文综述最新成果，提出极小子流形的二分性，通过体积加倍定理等机制推导其受限性带来的几何与函数论限制，将$\bf{R}^3$嵌入极小圆盘理论弱推广至所有维数。
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