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A Moebius characterization of submanifolds

机译:子流形的Moebius刻画

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In this paper, we study Moebius characterizations of submanifolds without umbilical points in a unit sphere S~(n+p)(1). First of all, we proved that, for an n-dimensional (n ≥ 2) submanifold x : M → S~(n+p)(1) without umbilical points and with vanishing Moebius form Φ, if (n - 2)‖A‖ ≤ ((n-1))~(1/2) {nR - 1[(n - 1) (2 - 1/p) - 1]} is satisfied, then, x is Moebius equivalent to an open part of either the Riemannian product S~(n-1)(r) x S~1((1-r~2)~(1/2)) in S~(n+1)(1), or the image of the conformal diffeomorphism σ of the standard cylinder S~(n-1)(1) x R in R~(n+1), or the image of the conformal diffeomorphism τ of the Riemannian product S~(n-1)(r) x H~1((1+r~2)~(1/2)) in H~(n+1), or x is locally Moebius equivalent to the Veronese surface in S~4(1). When p = 1, our pinching condition is the same as in Main Theorem of Hu and Li [6], in which they assumed that M is compact and the Moebius scalar curvature n(n-1)R is constant. Secondly, we consider the Moebius sectional curvature of the immersion x. We obtained that, for an n-dimensional compact submanifold x : M → S~(n+p)(1) without umbilical points and with vanishing form Φ, if the Moebius scalar curvature n(n-1)R of the immersion x is constant and the Moebius sectional curvature K of the immersion x satisfies K ≥ 0 when p = 1 and K > 0 when p > 1. Then, x is Moebius equivalent to eith er the Riemannian product S~k(r) X S~(n-k)((1-r~2)~(1/2)), for k = 1, 2, • • • , n - 1, in S~(n+1) (1); or x is Moebius equivalent to a compact minimal submanifold with constant scalar curvature in S~(n+p)(1).
机译:在本文中,我们研究了单位球面S〜(n + p)(1)中没有脐点的子流形的Moebius刻画。首先,我们证明,对于n维(n≥2)子流形x:M→S〜(n + p)(1)无脐点且Moebius形式为Φ消失,如果(n-2)”满足A‖≤((n-1)/ n)〜(1/2){nR-1 / n [(n-1)(2-1 -p / p)-1]},则x为Moebius等效到S〜(n + 1)(1)中的黎曼乘积S〜(n-1)(r)x S〜1((1-r〜2)〜(1/2))的开放部分,或标准圆柱S〜(n-1)(1)x R在R〜(n + 1)中的保形微分σ的图像,或黎曼乘积S〜(n- 1)(r)x H〜1((1 + r〜2)〜(1/2))在H〜(n + 1)中,或者x局部等于Moebius,等于S〜4(1)中的Veronese曲面。当p = 1时,我们的捏合条件与Hu和Li [6]的主定理相同,他们假设M是紧致的,而Moebius标量曲率n(n-1)R是恒定的。其次,我们考虑沉浸x的Moebius截面曲率。对于浸没x的Moebius标量曲率n(n-1)R,我们得到了对于n维紧子流形x:M→S〜(n + p)(1)没有脐点且具有Φ消失的形式是常数,浸入x的Moebius截面曲率K在p = 1时满足K≥0,在p> 1时满足K>0。然后,x是Moebius等于黎曼乘积S〜k(r)XS〜( nk)((1-r〜2)〜(1/2)),对于k = 1,2,•••,n-1,在S〜(n + 1)(1)中;或x是Moebius等效于S〜(n + p)(1)中具有恒定标量曲率的紧致最小子流形。

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