Hyperbolic geometry and non-Kahler manifolds with trivial canonical bundle
Abstract
We use hyperbolic geometry to construct simply-connected symplectic or complex manifolds with trivial canonical bundle and with no compatible Kahler structure. We start with the desingularisations of the quadric cone in C^4: the smoothing is a natural S^3-bundle over H^3, its holomorphic geometry is determined by the hyperbolic metric; the small-resolution is a natural S^2-bundle over H^4 with symplectic geometry determined by the metric. Using hyperbolic geometry, we find orbifold quotients with trivial canonical bundle; smooth examples are produced via crepant resolutions. In particular, we find the first example of a simply-connected symplectic 6-manifold with c_1=0 that does not admit a compatible Kahler structure. We also find infinitely many distinct complex structures on 2(S^3xS^3)#(S^2xS^4) with trivial canonical bundle. Finally, we explain how an analogous construction for hyperbolic manifolds in higher dimensions gives symplectic non-Kahler "Fano" manifolds of dimension 12 and higher.
- Publication:
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arXiv e-prints
- Pub Date:
- May 2009
- DOI:
- 10.48550/arXiv.0905.3237
- arXiv:
- arXiv:0905.3237
- Bibcode:
- 2009arXiv0905.3237F
- Keywords:
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- Mathematics - Symplectic Geometry;
- Mathematics - Differential Geometry
- E-Print:
- 27 pages. v4 corrected error in discussion of topology of symplectic example