Article,

Polar actions on symmetric spaces

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Journal of Differential Geometry, 77 (3): 425-482 (November 2007)
DOI: 10.4310/jdg/1193074901

Abstract

We study isometric Lie group actions on symmetric spaces admitting a section, i.e., a submanifold that meets all orbits orthogonally at every intersection point. We classify such actions on the compact symmetric spaces with simple isometry group and rank greater than one. In particular, we show that these actions are hyperpolar, i.e., the sections are flat.

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