On Closed 6-Manifolds Admitting Riemannian Metrics with Positive Sectional Curvature and Non-Abelian Symmetry

Abstract

We study the topology of closed, simply-connected, 6-dimensional Riemannian manifolds of positive sectional curvature which admit isometric actions by $SU(2)$ or $SO(3)$. We show that their Euler characteristic agrees with that of the known examples, i.e., $S^6$, ${\mathbb{CP}}^3$, the Wallach space $SU(3)/T^2$ and the biquotient $SU(3)//T^2$. We determine the non-trivial principal isotropy actions, classify the fixed-point-free $SU(2)$-actions without exceptional orbits, and give restrictions on the exceptional strata. In particular, an exceptional isotropy group for an $SU(2)$-action is cyclic of odd order, while tetrahedral exceptional isotropy occurs for the irreducible linear $SO(3)$-action on the round $6$-sphere.

AI revised. A few gaps fixed. 23 pages, 8 figures. Any comments are welcome

References in corpus (2)

• Finite extinction time for the solutions to the Ricci flow on certain three-manifolds
• Examples of Riemannian Manifolds with non-negative sectional curvature