Blow-up of generalized complex 4-manifolds

Details Blow-up of generalized complex 4-manifolds Blow-up of generalized complex 4-manifolds

2008-06-05

arxiv.org/abs/0806.0872v1

J.Topol.2:840-864,2009

Mathematics

Symplectic Geometry

25 pages, 15 figures

Scientific paper

10.1112/jtopol/jtp031

We introduce blow-up and blow-down operations for generalized complex 4-manifolds. Combining these with a surgery analogous to the logarithmic transform, we then construct generalized complex structures on nCP2 # m \bar{CP2} for n odd, a family of 4-manifolds which admit neither complex nor symplectic structures unless n=1. We also extend the notion of a symplectic elliptic Lefschetz fibration, so that it expresses a generalized complex 4-manifold as a fibration over a two-dimensional manifold with boundary.

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