理学院“格物论坛”学术报告(二十八)
报告题目:Pinching theorems for self-shrinkers of higher codimension
报 告 人:浙江大学数学中心
赵恩涛 副教授
时 间: 2017年6月5(周一)上午9:20-10:10
地 点: 理生楼多功能厅A513
摘要:
I will talk about the pinching phenomena of the tracefreesecond fundamental form of complete self-shrinkers of higher codimension.Firstly, assuming the mean curvature is nonzero everywhere and theself-shrinker is of polynomial volume growth, we prove that if thetracefree second fundamental form $/mathring{A}$ satisfies $||/mathring{A}||_{n}<C(n)$for a positive constant $C(n)$ depending only on the dimension $n$of the self-shrinker, then it is isometric to the sphere $/mathbb{S}^{n}(/sqrt{2n})$.Secondly, we show if the mean curvature vector $H$ of the self-shrinkersatisfies $/sup|H|</sqrt{/frac{n}{2}}$ and $/mathring{A}$ satisfies$||/mathring{A}||_{n}<D(n,/sup|H|)$ for a positive constant $D(n,/sup|H|)$depending $n$ and $/sup|H|$, then it is isometric to the Euclideanspace $/mathbb{R}^{n}$. We also obtain some rigidity theorems forself-shrinkers satisfying pointwise curvature pinching conditionson $|/mathring{A}|^{2}$. This talk is based the joint work withProf. Hongwei Xu and Dr. Shunjuan Cao.
报告人简介:
赵恩涛,浙江大学数学中心副教授,硕士生导师。2004年进入浙江大学数学中心学习,2009年获理学博士学位。曾先后在浙江大学和台湾大学从事博士后研究工作。研究领域为整体微分几何与几何分析,特别是与曲率流相关的问题。已发表论文近20篇,其中很多在著名国际期刊上发表,如 J. Math. Pures Appl. , Comm. Anal. Geom. 等。
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南昌大学科学技术处
南昌大学理学院
2017年6月