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arXiv 1306.3278math.DG
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乘积流形浸入的一个分解定理

A decomposition theorem for immersions of product manifolds

Ruy Tojeiro

摘要:

我们在乘积流形上引入极度量,其中乘积度量和翘曲乘积度量是特例。我们证明了一个de Rham型定理,刻画了黎曼流形可以局部分解为一个具有极度量的乘积流形。对于具有极度量的乘积流形,我们的主要结果给出了它所有等距浸入到一个空间型中的完整描述,该空间形式的第二基本型与它的乘积结构相适应,即每个因子的切空间由所有形状算子保持.这是一个意义深远的推广的基本分解定理等距浸入黎曼产品由于摩尔以及其扩展Nölker等距浸入翘曲产品。

英文摘要:

We introduce polar metrics on a product manifold, which have product and warped product metrics as special cases. We prove a de Rham-type theorem characterizing Riemannian manifolds that can be locally decomposed as a product manifold endowed with a polar metric. For a product manifold endowed with a polar metric, our main result gives a complete description of all its isometric immersions into a space form whose second fundamental forms are adapetd to its product structure, in the sense that the tangent spaces to each factor are preserved by all shape operators. This is a far-reaching generalization of a basic decomposition theorem for isometric immersions of Riemannian products due to Moore as well as its extension by Nölker to isometric immersions of warped products.

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