## 3-Sasakian manifolds.(English)Zbl 1008.53047

LeBrun, Claude (ed.) et al., Surveys in differential geometry: essays on Einstein manifolds. Lectures on geometry and topology, sponsored by Lehigh University’s Journal of Differential Geometry. Cambridge, MA: International Press. Surv. Differ. Geom., Suppl. J. Differ. Geom. 6, 123-184 (1999).
This is a review chapter on 3-Sasakian manifolds. First, there are presented definitions, notions and fundamental properties of Sasakian, Sasakian-Einstein and 3-Sasakian manifolds. Then the geometry of the foliations on these manifolds are discussed and a classification of homogeneous structures is given. There are enclosed many important results on Betti numbers of Sasakian and 3-Sasakian manifolds, Killing spinors, $$G_2$$-structures, 3-Sasakian quotient construction and toric 3-Sasakian manifolds. The last part of the paper contains open problems, questions and conjectures followed by an appendix on fundamentals of orbifolds. The reader will find a brief history of 3-Sasakian structures and 134 items as references.
For the entire collection see [Zbl 0961.00021].

### MSC:

 53C25 Special Riemannian manifolds (Einstein, Sasakian, etc.)
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