Fano Manifolds, Contact Structures, and Quaternionic Geometry

Details Fano Manifolds, Contact Structures, and Quaternionic Geometry Fano Manifolds, Contact Structures, and Quaternionic Geometry

1994-09-09

arxiv.org/abs/dg-ga/9409001v1

Mathematics

Differential Geometry

21 pages, LaTeX

Scientific paper

Let Z be a compact complex (2n+1)-manifold which carries a {\em complex contact structure}, meaning a codimension-1 holomorphic sub-bundle D of TZ which is maximally non-integrable. If Z admits a K\"ahler-Einstein metric of positive scalar curvature, we show that it is the Salamon twistor space of a quaternion-K\"ahler manifold (M^{4n}, g). If Z also admits a second complex contact structure, then Z= CP_{2n+1}. As an application, we give several new characterizations of the Riemannian manifold HP_n=Sp(n+1)/( Sp(n)\times Sp(1)).

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