Abstract
We classify compact simply-connected 5-dimensional manifolds which admit a metric of nonnegative curvature with a connected non-abelian group acting by isometries. We show that they are diffeomorphic to either \(\hbox {S}^{5}, \hbox {S}^{3} \times \hbox {S}^{2}\), the nontrivial \(\hbox {S}^{3}\)-bundle over \(\hbox {S}^{2}\) or the Wu-manifold, SU(3)/SO(3). This result is a consequence of our equivariant classification of all SO(3) and SU(2)-actions on compact simply-connected five-manifolds. In the case of positive curvature we obtain a partial classification.
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Acknowledgments
This work is part of the author’s Ph.D. thesis at IMPA. He would like to express gratitude to IMPA for its hospitality and to his doctoral supervisors Luis A. Florit and Wolfgang Ziller for long hours of helpful and pleasant conversations during the preparation of this paper.
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The author was partially supported by CNPq-BRAZIL.
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Simas, F. Nonnegatively curved five-manifolds with non-abelian symmetry. Geom Dedicata 181, 61–82 (2016). https://doi.org/10.1007/s10711-015-0112-6
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DOI: https://doi.org/10.1007/s10711-015-0112-6
Keywords
- Nonnegative curvature
- Non-negative curvature
- Positive curvature
- Group actions
- Classification of group actions
- SO(3)
- SU(2)
- Non-abelian symmetry
- Five-dimensional manifolds
- Low dimensions
- Compact manifolds
- Simply-connected manifolds