We construct infinitely many complete, immersed self-shrinkers with rotational symmetry for each of the following topological types: the sphere, the plane, the cylinder, and the torus.
We study integral and pointwise bounds on the second fundamental form of properly immersed self-shrinkers with boundedHA. As applications, we discuss gap and compactness results for self-shrinkers.
Rigidity theorems for complete Legendrian self-shrinkers
Shanghai Institute for Mathematics and Interdisciplinary Sciences(上海数学与交叉学科研究院);School of Mathematics and Statistics Wuhan University(武汉大学数学与统计学院);School of Mathematical Sciences Chongqing University of Technology(重庆理工大学数学科学学院)
We show that two properly embedded self-shrinkers in Euclidean space that are sufficiently separated at infinity must intersect at a finite point. The proof is based on a localized version of the Reilly formula applied to a suitable f-harmonic function with controlled gradient. In the immersed case, a new direct proof of the generalized half-space property is also presented.
In this note we show that compact self shrinkers in $\mathbb{R}^3$ are "topologically standard" in that any genus $g$ compact self shrinker is ambiently isotopic to the standard genus $g$ embedded surface in $\mathbb{R}^3$. As a consequence self shrinking tori are unknotted.
Complete self-shrinkers confined into some regions of the space
我们研究了完备非紧有界自收缩曲面的几何性质,得到了使这些超曲面成为紧的自然限制条件。此外,我们观察到,在一定程度上,完全的自收缩相交的超平面通过原点。当这样的交集是紧凑的,我们推导出光谱信息的自然漂移拉普拉斯相关的自收缩。这些结果对于验证H. D. Cao关于完全自收缩体的多项式体积增长。对于自收缩体被限制在圆柱形制品中的情况,给出了有限强最大值原理。
In this note we first show a compactness theorem for rotationally symmetric self shrinkers of entropy less than 2, concluding that there are entropy minimizing self shrinkers diffeomorphic to $S^1 \times S^{n-1}$ for each $n \geq 2$ in the class of rotationally symmetric self shrinkers. Assuming extra symmetry, namely that the profile curve is convex, we remove the entropy assumption. Supposing the profile curve is additionally reflection symmetric we show there are only finitely many such shrinkers up to rigid motion.
The purpose of this paper is to study complete self-shrinkers of mean curvature flow in Euclidean spaces. In the paper, we give a complete classification for 2-dimensional complete Lagrangian self-shrinkers in Euclidean space $\mathbb R^4$ with constant squared norm of the second fundamental form.
In this paper, we present a sufficient condition for finite Morse index of complete properly self-shrinkers. We prove that a complete properly embedded self-shrinker in $\mathbb{R}^{n+1}$ with finite asymptotically conical ends or asymptotically cylindrical ends must have finite Morse index. Moreover, as an application of this result, we show that a complete properly embedded self-shrinker in $\mathbb{R}^3$ with finite genus has finite Morse index.
In this paper, we prove that the closed Lagrangian self-shrinkers in $\mathbb{R}^4$ which are symmetric with respect to a hyperplane are given by the products of Abresch-Langer curves. As a corollary, we obtain a new geometric characterization of the Clifford torus as the unique embedded closed Lagrangian self-shrinker symmetric with respect to a hyperplane in $\mathbb{R}^4$.
In this paper, we classify $3$-dimensional complete self-shrinkers in Euclidean space $\mathbb R^{4}$ with constant squared norm of the second fundamental form $S$ and constant $f_{4}$.
We show that the product of two round shrinking spheres is an isolated self-shrinker in any codimension, modulo rotations. Moreover we prove explicit Łojasiewicz inequalities near such products. Łojasiewicz inequalities were previously used by Schulze to prove uniqueness of tangent mean curvature flows at compact shrinkers; our results provide an explicit rate of convergence to products of two spheres.
We construct Gaussian Harmonic forms of finite Gaussian weighted $L^2$-norm on non-compact surfaces that detect each asymptotically conical end. As an application we prove an extension of the index estimates of self-shrinkers in $[11]$ under the existence of such ends. We show that the Morse index of a self-shrinker is greater or equal to $\frac{2g+r-1}{3}$, where $r$ is the number of asymptotically conical ends.
In this paper, we study complete self-shrinkers in Euclidean space and prove that an $n$-dimensional complete self-shrinker in Euclidean space $\mathbb{R}^{n+1}$ is isometric to either $\mathbb{R}^{n}$, $S^{n}(\sqrt{n})$, or $S^k (\sqrt{k})\times\mathbb{R}^{n-k}$, $1\leq k\leq n-1$, if the squared norm $S$ of the second fundamental form, $f_3$ are constant and $S$ satisfies $S<1.83379$. We should remark that the condition of polynomial volume growth is not assumed.
Self-shrinkers of the mean curvature flow in arbitrary codimension
对于维数大于1的超曲面,Huisken证明了具有正标量中曲率的中曲率流的紧致自收缩体是球面。我们将证明以下扩展:一个紧致的自相似的解决方案在任意余维和维数大于1是球形的,即包含在一个球,当且仅当中曲率向量\be H \ee是非零的和主法线\be ν \ee是平行的正常丛。我们还给出了这类完全非紧自收缩子的一个分类。
Rigidity and Curvature Estimates for Graphical Self-shrinkers
自收缩器是在中曲率流动下相似收缩的超曲面;这些孤子模拟了流动的奇异性。目前已知一个整自缩图必是一个超平面。在本文中,我们表明,超平面是刚性的,在更强的意义上,即:对于$2 \leq n \leq 6$,任何光滑,完整的自收缩$Σ^n\subset\mathbf{R}^{n+1}$,这是图形内的一个大的,但紧凑的,必须是一个超平面。事实上,这种刚性存在于更大的一类几乎稳定的自收缩体中。本文的一个关键组成部分是采购的线性曲率估计几乎稳定的收缩,这是负责对$n$的限制这一步。我们的方法也产生一致的曲率界的平移孤子的中曲率流。
In this paper, we completely classify $3$-dimensional complete self-shrinkers with constant norm $S$ of the second fundamental form and constant $f_{3}$ in Euclidean space $\mathbb R^{4}$, where $h_{ij}$ are components of the second fundamental form, $S=\sum_{i,j}h^{2}_{ij}$ and $f_{3}=\sum_{i,j,k}h_{ij}h_{jk}h_{ki}$.