Nonnegatively curved fixed point homogeneous 5-manifolds

Details Nonnegatively curved fixed point homogeneous 5-manifolds Nonnegatively curved fixed point homogeneous 5-manifolds

2011-05-03

arxiv.org/abs/1105.0551v1

Mathematics

Differential Geometry

12 pages

Scientific paper

Let $G$ be a compact Lie group acting effectively by isometries on a compact Riemannian manifold $M$ with nonempty fixed point set $Fix(M,G)$. We say that the action is \emph{fixed point homogeneous} if $G$ acts transitively on a normal sphere to some component of $Fix(M,G)$, equivalently, if $Fix(M,G)$ has codimension one in the orbit space of the action. We classify up to diffeomorphism closed, simply connected 5-manifolds with nonnegative sectional curvature and an effective fixed point homogeneous isometric action of a compact Lie group.

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