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arXiv 2401.07620math.DGmath-phmath.DSmath.MPnlin.SI
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可约空间上的 Killing 张量

Killing tensors on reducible spaces

Friedrich-Schiller-Universität(弗里德里希·席勒大学);La Trobe University(拉筹伯大学)

Vladimir S. Matveev, Yuri Nikolayevsky

AI总结:

研究可约空间上 Killing 张量的可约性,证明其可分解为因子上的 Killing 张量之和,并给出局部描述及例子。

摘要:

我们证明,在两个黎曼流形的乘积中,若其中一个为紧致的,则任意 Killing 张量都是可约的,即为因子上 Killing 张量的和。同样地,紧致流形上具有可约 holonomy 的 Killing 张量在其 universal cover 上也成立。我们给出了乘积流形上 Killing 张量的局部描述,并提供了一个局部不可约因子但存在不可约 Killing 张量场的完备乘积流形的例子。

英文摘要:

We prove that on the product of two Riemannian manifolds one of which is compact, any Killing tensor is reducible, that is, is the sum of products of Killing tensors on the factors. The same is true for the lifts to the universal cover of Killing tensors on a compact manifold with reducible holonomy. We give a local description of Killing tensors on product manifolds and present an example of a complete product manifold whose factors are locally irreducible which admits an irreducible Killing tensor field.

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