Totally Geodesic Foliations and Doubly Ruled Surfaces in a Compact Lie Group

Details Totally Geodesic Foliations and Doubly Ruled Surfaces in a Compact Lie Group Totally Geodesic Foliations and Doubly Ruled Surfaces in a Compact Lie Group

2009-10-20

arxiv.org/abs/0910.3844v1

Mathematics

Differential Geometry

Scientific paper

For a Riemannian submersion from a simple compact Lie group with a bi-invariant metric, we prove the action of its holonomy group on the fibers is transitive. As a step towards classifying Riemannian submersions with totally geodesic fibers, we consider the parameterized surface induced by lifting a base geodesic to points along a geodesic in a fiber. Such a surface is "doubly ruled" (it is ruled by horizontal geodesics and also by vertical geodesics). Its characterizing properties allow us to define "doubly ruled parameterized surfaces" in any Riemannian manifold, independent of Riemannian submersions. We initiate a study of the doubly ruled parameterized surfaces in compact Lie groups and in other symmetric spaces by establishing several rigidity theorems and by providing several examples with unexpected properties.

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