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arXiv 1806.06255math.DG
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负曲流形上的广义向量向量积与Killing型

Generalized vector cross products and Killing forms on negatively curved manifolds

Maria Laura Barberis, Andrei Moroianu, Uwe Semmelmann

摘要:

受紧致负截面曲率黎曼流形上Killing型研究的启发,我们在$\mathbb{R}^n$上引入了广义向量向量积的概念,并给出了它们的分类.利用先前关于负曲率流形上Killing张量的结果和$6$维中的$\mathrm{SU}(3)$ -结构的一个新的刻画,证明了当$n\ge 4$的$3$-形式为Killing时,具有负截面曲率的紧致$n$维黎曼流形上的Killing $3$ -形式为零.

英文摘要:

Motivated by the study of Killing forms on compact Riemannian manifolds of negative sectional curvature, we introduce the notion of generalized vector cross products on $\mathbb{R}^n$ and give their classification. Using previous results about Killing tensors on negatively curved manifolds and a new characterization of $\mathrm{SU}(3)$-structures in dimension $6$ whose associated $3$-form is Killing, we then show that every Killing $3$-form on a compact $n$-dimensional Riemannian manifold with negative sectional curvature vanishes if $n\ge 4$.

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