Holomorphic sectional curvature, nefness and Miyaoka–Yau type inequality

Holomorphic sectional curvature, nefness and Miyaoka–Yau type inequality
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全纯截面曲率、粗度和Miyaoka-Yau型不等式

DOI:
10.1007/s00209-020-02636-z
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发表时间:
2018
影响因子:
0.8
通讯作者:
Yashan Zhang
Yashan Zhang
中科院分区:
数学2区
文献类型:
--
作者:
Yashan Zhang

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在紧致Kähler流形上,我们引入了全纯截面曲率的几乎非正性的概念,根据定义,它比具有半负全纯截面曲率的Kähler度量的存在性弱。证明了具有几乎非正全纯截面曲率的紧致Kähler流形有一个nef标准线丛,不含有理曲线,且满足Miyaoka-Yau型不等式。在讨论的过程中,我们附加一个真实的值到任何固定的Kähler类,直到一个常数因子只取决于流形的维数,原来是一个上界的nef阈值。
On a compact Kähler manifold, we introduce a notion of almost nonpositivity for the holomorphic sectional curvature, which by definition is weaker than the existence of a Kähler metric with semi-negative holomorphic sectional curvature. We prove that a compact Kähler manifold of almost nonpositive holomorphic sectional curvature has a nef canonical line bundle, contains no rational curves and satisfies some Miyaoka-Yau type inequalities. In the course of the discussions, we attach a real value to any fixed Kähler class which, up to a constant factor depending only on the dimension of manifold, turns out to be an upper bound for the nef threshold.
DOI: 10.1090/gsm/077
发表时间: 2018
期刊: --
影响因子: --
作者:
B. Chow;P. Lu;Lei Ni
通讯作者: B. Chow;P. Lu;Lei Ni