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arXiv 2603.23932math.DG
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闭合流形的欧拉特征与近非负曲率算子

Euler Characteristic of Closed Manifolds with Almost Nonnegative Curvature Operator

University of Science and Technology of China(中国科学技术大学)

Jing-Bin Cai

AI总结:

研究具有近非负曲率算子的闭合流形,解决Herrmann-Sebastian-Tuschmann关于其欧拉特征符号的问题,证明在特定条件下欧拉特征非负,并在无限基本群条件下证明欧拉特征、签名及$\widehat{A}$-特征 vanish。

摘要:

我们研究具有近非负曲率算子的闭合流形,并解决Herrmann--Sebastian--Tuschmann关于其欧拉特征符号的问题。我们的主要结果表明,如果一个闭合$2n$维流形具有近非负曲率算子且曲率算子有统一上界,则其欧拉特征非负。此外,在ANCO型条件和假设基本群为无限时,我们证明欧拉特征、签名以及在旋量情况下$\widehat{A}$-特征的消失,扩展了Chen--Ge--Han最近关于近非负里奇曲率的研究。

英文摘要:

We study closed manifolds with almost nonnegative curvature operator and address a question of Herrmann--Sebastian--Tuschmann concerning the sign of their Euler characteristic. Our main result shows that if a closed $2n$-dimensional manifold admits an almost nonnegative curvature operator together with a uniform upper bound on the curvature operator, then its Euler characteristic is nonnegative. In addition, under an ANCO-type condition and assuming that the fundamental group is infinite, we prove vanishing results for the Euler characteristic, the signature, and, in the spin case, the $\widehat{A}$-genus, extending recent work of Chen--Ge--Han from almost nonnegative Ricci curvature to the curvature-operator setting.

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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