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Donaldson-Witten Functions of Massless N=2 Supersymmetric QCD

Hiroaki Kanno, Sung-Kil Yang

hep-tharXiv:hep-th/9806015

Abstract

We study the Donaldson-Witten function in four-dimensional topological gauge theory which is constructed from N=2 supersymmetric SU(2) gauge theory with Nf < 4 massless fundamental hypermultiplets. When Nf = 2,3, the strong-coupling singularities with multiple massless monopoles appear in the moduli space (the u-plane) of the Coulomb branch. We show that the invariants made out of such singularities exhibit a property which is similar to the one expected for four-manifolds of generalized simple type.

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