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arXiv · 1905.02260

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

Yuhang Liu
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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.

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Yuhang Liu. 2019-05-06. On Closed 6-Manifolds Admitting Riemannian Metrics with Positive Sectional Curvature and Non-Abelian Symmetry. https://arxiv.org/abs/1905.02260

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