Article,

Homogeneous spaces with polar isotropy

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manuscripta mathematica, 110 (4): 487--503 (Apr 1, 2003)
DOI: 10.1007/s00229-002-0345-1

Abstract

We consider homogeneous spaces G/K with G a simple compact Lie group, endowed with an arbitrary G-invariant Riemannian metric. We classify those spaces where the action of K on G/K is polar and show that such spaces are locally symmetric. Moreover we give a classification of pairs (G,K) with G compact semisimple such that K has polar linear isotropy representation.

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