Morse-Novikov cohomology of almost nonnegatively curved manifolds

Morse-Novikov cohomology of almost nonnegatively curved manifolds
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几乎非负弯曲流形的莫尔斯-诺维科夫上同调

DOI:
10.1016/j.aim.2020.107249
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发表时间:
2019-04
影响因子:
1.7
通讯作者:
Xiaoyang Chen
Xiaoyang Chen
中科院分区:
数学1区
文献类型:
--
作者:
Xiaoyang Chen

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设Mn是具有几乎非负截面曲率和非零第一de Rham上同调群的闭流形.利用拓扑论证,证明了Morse-Novikov上同调群Hp(Mn,θ)对任意p为零且[θ]∈ HdR 1(Mn),[θ]<$0.基于一个新的积分公式,我们还证明了一个类似的结果保持几乎非负的Ricci曲率闭流形的额外假设下,其曲率算子是一致有界的。
Let M n be a closed manifold of almost nonnegative sectional curvature and nonzero first de Rham cohomology group. Using a topological argument, we show that the Morse-Novikov cohomology group H p (M n, θ) vanishes for any p and [θ]∈ H d R 1 (M n),[θ]≠ 0. Based on a new integral formula, we also show that a similar result holds for a closed manifold of almost nonnegative Ricci curvature under the additional assumption that its curvature operator is uniformly bounded from below.
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