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A Decomposition Theorem for Immersions of Product Manifolds

Published online by Cambridge University Press:  17 April 2015

Ruy Tojeiro*
Affiliation:
Universidade Federal de São Carlos, Via Washington Luiz, Km 235, 13565-905 São Carlos, Brazil ([email protected])

Abstract

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 or globally decomposed as a product manifold endowed with a polar metric. For such a product manifold, our main result gives a complete description of all its isometric immersions into a space form whose second fundamental forms are adapted 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 of its extension by Nölker to isometric immersions of warped products.

Type
Research Article
Copyright
Copyright © Edinburgh Mathematical Society 2016 

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