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VANISHING THEOREMS FOR HYPERSURFACES IN THE UNIT SPHERE

Part of: Global differential geometry

Published online by Cambridge University Press:  28 January 2018

HEZI LIN
HEZI LIN*
Affiliation:
School of Mathematics and Computer Science & FJKLMAA, Fujian Normal University, Fuzhou 350108, China e-mail: lhz1@fjnu.edu.cn
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Abstract

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Let Mn, n ≥ 3, be a complete hypersurface in $\mathbb{S}$n+1. When Mn is compact, we show that Mn is a homology sphere if the squared norm of its traceless second fundamental form is less than $\frac{2(n-1)}{n}$. When Mn is non-compact, we show that there are no non-trivial L2 harmonic p-forms, 1 ≤ p ≤ n − 1, on Mn under pointwise condition. We also show the non-existence of L2 harmonic 1-forms on Mn provided that Mn is minimal and $\frac{n-1}{n}$-stable. This implies that Mn has only one end. Finally, we prove that there exists an explicit positive constant C such that if the total curvature of Mn is less than C, then there are no non-trivial L2 harmonic p-forms on Mn for all 1 ≤ p ≤ n − 1.

MSC classification

Primary: 53C20: Global Riemannian geometry, including pinching
Secondary: 53C42: Immersions (minimal, prescribed curvature, tight, etc.)
Type
Research Article
Information
Glasgow Mathematical Journal , Volume 60 , Issue 3 , September 2018 , pp. 661 - 671
Copyright
Copyright © Glasgow Mathematical Journal Trust 2018 

References

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