Instantons and curves on class VII surfaces

Details Instantons and curves on class VII surfaces Instantons and curves on class VII surfaces

2007-04-20

arxiv.org/abs/0704.2634v4

Mathematics

Differential Geometry

LaTeX 48 pages; RV: minor corrections, new paragraph dedicated to the structure of the moduli space around the circles of redu

Scientific paper

We develop a general strategy, based on gauge theoretical methods, to prove existence of curves on class VII surfaces. We prove that, for $b_2=2$, every minimal class VII surface has a cycle of rational curves hence, by a result of Nakamura, is a global deformation of a one parameter family of blown up primary Hopf surfaces. The case $b_2=1$ has been solved in a previous article. The fundamental object intervening in our strategy is the moduli space ${\mathcal M}^{\pst}(0,{\mathcal K})$ of polystable bundles ${\mathcal E}$ with $c_2({\mathcal E})=0$, $\det({\mathcal E})={\mathcal K}$. For large $b_2$ the geometry of this moduli space becomes very complicated. The case $b_2=2$ treated here in detail requires new ideas and difficult techniques of both complex geometric and gauge theoretical nature.

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