G-manifolds with positive Ricci curvature and many isolated singular orbits

preprint2013arXivOpen access

Abstract

We show that in cohomogeneity 3 there are G-manifolds with any given number of isolated singular orbits and an invariant metric of positive Ricci curvature. We show that the corresponding result is also true in cohomogeneity 5 provided the number of singular orbits is even.

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