Abstract
Let G be a compact Lie group acting isometrically on a compact Riemannian manifold M with nonempty fixed point set M G. We say that M is fixed-point homogeneous if G acts transitively on a normal sphere to some component of M G. Fixed-point homogeneous manifolds with positive sectional curvature have been completely classified. We classify nonnegatively curved fixed-point homogeneous Riemannian manifolds in dimensions 3 and 4 and determine which nonnegatively curved simply-connected 4-manifolds admit a smooth fixed-point homogeneous circle action with a given orbit space structure.
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Galaz-Garcia, F. Nonnegatively curved fixed point homogeneous manifolds in low dimensions. Geom Dedicata 157, 367–396 (2012). https://doi.org/10.1007/s10711-011-9615-y
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DOI: https://doi.org/10.1007/s10711-011-9615-y