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Spherical rigidities of submanifolds in Euclidean spaces

机译:欧氏空间中子流形的球形刚度

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摘要

In this paper, we study n-dimensional complete immersed submanifolds in a Euclidean space E~(n+p). We prove that if M~n is an n-dimensional compact connected immersed submanifold with nonzero mean curvature H in E~(n+p) and satisfies either: (1) S ≤ ((n~2H~2)/(n-1)') or (2) n~2H~2 ≤ (((n-1)R)/(n-2)') then M~n is diffeomorphic to a standard n-sphere, where S and R denote the squared norm of the second fundamental form of M~n and the scalar curvature of M~n, respectively. On the other hand, in the case of constant mean curvature, we generalized results of Klotz and Osserman to arbitrary dimensions and codimensions; that is, we proved that the totally umbilical sphere S~n(c), the totally geodesic Euclidean space E~n, and the generalized cylinder S~(n-1)(c) x E~1 are only n-dimensional (n > 2) complete connected submanifolds M~n with constant mean curvature H in E~(n+P) if S ≤ n~2H~2 / (n-1) holds.
机译:在本文中,我们研究了欧氏空间E〜(n + p)中的n维完全沉浸子流形。我们证明如果M〜n是E〜(n + p)中具有非零平均曲率H的n维紧连通沉浸式子流形,并且满足以下条件之一:(1)S≤((n〜2H〜2)/(n- 1)')或(2)n〜2H〜2≤((((n-1)R)/(n-2)'),则M〜n对标准n球面是微晶的,其中S和R表示第二基本形式的M〜n的平方范数和M〜n的标量曲率。另一方面,在平均曲率恒定的情况下,我们将Klotz和Osserman的结果推广到任意尺寸和余维。也就是说,我们证明了总脐球S〜n(c),总测地欧氏空间E〜n和广义圆柱S〜(n-1)(c)x E〜1只是n维的( n> 2)如果S≤n〜2H〜2 / /(n-1)成立,则在E〜(n + P)中具有恒定平均曲率H的完全连通子流形M〜n。

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