Moduli spaces of PU(2)-monopoles (revised version)

Details Moduli spaces of PU(2)-monopoles (revised version) Moduli spaces of PU(2)-monopoles (revised version)

1999-06-24

arxiv.org/abs/math/9906163v1

Mathematics

Differential Geometry

65 pages, LaTeX, to appear in Asian J. Math

Scientific paper

We prove generic regularity and Uhlenbeck-type compactification theorems for the moduli spaces of PU(2)-monopoles. Generic regularity is NOT obtained in the usual way (by applying Sard theorem to a smooth parameterized moduli space), since the parameterized moduli space can be a priori singular. We explain why, using the standard order 0-perturbations, one cannot get the smoothness of the parameterized moduli space. (The same difficulty arises in the case of ASD-Spin^c moduli spaces, so the definition of the Spin^c-polynomial invariants should be revised.) We show that the singular locus of the parameterized moduli space is contained in a closed subspace which is (in a certain sense) of infinite codimension, and we apply Sard theorem to the complement of this subspace. Our approach to prove Uhlenbeck compactness follows closely the strategy developed in the instanton case by Donaldson and Kronheimer. Similar results, with different methods, were obtained by Feehan - Leness and Feehan.

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