Abstract
A singular foliation on a complete Riemannian manifold M is said to be Riemannian if each geodesic that is perpendicular at one point to a leaf remains perpendicular to every leaf it meets. We prove that if the distribution of normal spaces to the regular leaves is integrable, then each leaf of this normal distribution can be extended to be a complete immersed totally geodesic submanifold (called section), which meets every leaf orthogonally. In addition the set of regular points is open and dense in each section. This result generalizes a result of Boualem and solves a problem inspired by a remark of Palais and Terng and a work of Szenthe about polar actions. We also study the singular holonomy of a singular Riemannian foliation with sections (s.r.f.s. for short) and in particular the tranverse orbit of the closure of each leaf. Furthermore we prove that the closures of the leaves of a s.r.f.s on M form a partition of M which is a singular Riemannian foliation. This result proves partially a conjecture of Molino.
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References
Alexandrino M.M. (2004). Integrable riemannian submersion with singularities. Geom. Dedicata 108:141–152
Alexandrino M.M. (2004). Singular riemannian foliations with sections. Illinois J. Math. 48(4):1163–1182
Alexandrino M.M. (2005). Generalizations of isoparametric foliations. Mat. Contemp. 28:29–50
Alexandrino, M.M., Töben, D.: Singular riemannian foliations on simply connected spaces, to appear in Differential Geom. Appl.
Boualem H. (1995). Feuilletages riemanniens singuliers transversalement integrables. Compositio. Math. 95:101–125
Heintze, E., Liu, X., Olmos, C.: Isoparametric submanifolds and a Chevalley-type restriction theorem. Preprint 2000, http:// arxiv.org, math.dg.0004028.
Kollross A. (2002). A classification of hyperpolar and cohomogeneity one actions. Trans. Amer. Math. Soc. 354:571–612
Lytchak, A., Thorbergsson, G.: Variationally complete actions on nonnegatively curved manifolds, to appear in Illinois J. Math.
Molino P. (1988). Riemannian foliations. Progress in Mathematics, vol. 73. Birkhäuser, Boston
Molino P., Pierrot M. (1987). Théorèmes de slice et holonomie des feuilletages riemanniens singuliers. Ann. Inst. Fourier (Grenoble) 37(4):207–223
Palais R.S., Terng C.L. (1988). Critical point theory and submanifold geometry. Lecture Notes in Math. 1353, Springer-Verlag, Berlin
Podestà F., Thorbergsson G. (1999). Polar actions on rank one symmetric spaces. J. Differential Geom. 53(1):131–175
Szenthe J. (1984). Orthogonally transversal submanifolds and the generalizations of the Weyl group. Period. Math. Hungar. 15(4):281–299
Tebege, S.: Polar and coisotropic actions on kähler manifolds. Diplomarbeit, Mathematischer Institut der Universität zu Köln (2003).
Terng C.-L., Thorbergsson G. (1995). Submanifold geometry in symmetric spaces. J. Differential Geom. 42:665–718
Thorbergsson, G.: A Survey on Isoparametric Hypersurfaces and their Generalizations, Handbook of Differential Geometry, Vol. 1, Elsevier Science, Amsterdam (2000).
Thorbergsson, G.: Transformation groups and submanifold geometry, to appear in Rendiconti di Matematica.
Töben D. (2006). Parallel focal structure and singular riemannian foliations. Trans. Amer. Math. Soc. 358:1677–1704
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Alexandrino, M.M. Proofs of Conjectures about Singular Riemannian Foliations. Geom Dedicata 119, 219–234 (2006). https://doi.org/10.1007/s10711-006-9073-0
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DOI: https://doi.org/10.1007/s10711-006-9073-0
Keywords
- Singular Riemannian foliations
- Pseudogroups
- Equifocal submanifolds
- Polar actions
- Isoparametric submanifolds