Obstruction bundles, semiregularity, and Seiberg-Witten invariants

Details Obstruction bundles, semiregularity, and Seiberg-Witten invariants Obstruction bundles, semiregularity, and Seiberg-Witten invariants

1995-09-29

arxiv.org/abs/alg-geom/9509007v1

Mathematics

Algebraic Geometry

AMS-TeX, preprint style

Scientific paper

We compare the deformation theory and the analytic structure of the Seiberg-Witten moduli spaces of a K\"ahler surface to the corresponding components of the Hilbert scheme, and show that they are isomorphic. Next we show how to compute the invariant in case the moduli space is smooth but not of the expected dimension, and apply this study to elliptic surfaces. Finally we discuss ruled surfaces, both products and more general ruled surfaces. For product ruled surfaces we relate the infinitesimal structure of the moduli spaces to Brill-Noether theory and compute the invariant in special cases. For more general ruled surfaces, we relate the geometry of the Hilbert scheme to properties of stable bundles and give more general computations.

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