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arXiv 2102.02070math.DG
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Hopf纤维化的刚性

Rigidity of the Hopf fibration

Michael Markellos, Andreas Savas-Halilaj

摘要:

本文研究欧氏球面之间的极小映射。霍普夫纤维化提供了这种最小映射的明确例子。而且,它们对应的图具有常范数的第二基本型。证明了从$S^3$到其Gauss映射满足适当的Pinching条件的$S^2$的极小浸入必须是弱共形的且具有全测地纤维。因此,我们得到了从$S^3$到$S^2$的等变最小淹没与Hopf纤维化一致.进一步证明了具有常奇异值和第二基本型的常范数的极小映射$f:S^3 \to S^2$要么是常数映射,要么在等距映射下与Hopf纤维化重合.

英文摘要:

In this paper, we study minimal maps between euclidean spheres. The Hopf fibrations provide explicit examples of such minimal maps. Moreover, their corresponding graphs have second fundamental form of constant norm. We prove that a minimal submersion from $S^3$ to $S^2$ whose Gauss map satisfies a suitable pinching condition must be weakly conformal and with totally geodesic fibers. As a consequence, we obtain that an equivariant minimal submersion from $S^3$ to $S^2$ coincides with the Hopf fibration. Furthermore, we prove that a minimal map $f:S^3 \to S^2$ with constant singular values and constant norm of the second fundamental form is either constant or, up to isometries, coincides with the Hopf fibration.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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