Mathematics – Geometric Topology
Scientific paper
2006-08-02
Annals of Global Analysis and Geometry 32 (2007) No 3, 209-223
Mathematics
Geometric Topology
Preprint IME-USP; The final publication is available at springerlink.com http://www.springerlink.com/content/q48682633730t831/
Scientific paper
10.1007/s10455-006-9052-6
A singular riemannian foliation F on a complete riemannian manifold M is said to admit sections if each regular point of M is contained in a complete totally geodesic immersed submanifold (a section) that meets every leaf of F orthogonally and whose dimension is the codimension of the regular leaves of F. We prove that the algebra of basic forms of M relative to F is isomorphic to the algebra of those differential forms on a section that are invariant under the generalized Weyl pseudogroup of this section. This extends a result of Michor for polar actions. It follows from this result that the algebra of basic function is finitely generated if the sections are compact. We also prove that the leaves of F coincide with the level sets of a transnormal map (generalization of isoparametric map) if M is simply connected, the sections are flat and the leaves of F are compact. This result extends previous results due to Carter and West, Terng, and Heintze, Liu and Olmos.
Alexandrino Marcos
Gorodski Claudio
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