$S$-Duality and the Calabi-Yau Interpretation of the $N=4$ to $N=2$ Flow

Abstract

The action of the $S$-duality $Sl(2,Z)$ group on the moduli of the Calabi-Yau manifold $W\IP^{12}_{11226}$ appearing in the rank two dual pair $(K^{3}\times T^{2}/W\IP^{12}_{11226})$ is defined by interpreting the $N=4$ to $N=2$ flow, for $SU(2)$ supersymmetric Yang-Mills, in terms of the Calabi-Yau moduli. The different singularity loci are mapped in a one to one way, and the ($N=2$ limit/point particle limit) is obtained in both cases by the same type of blow up. Moreover, it is shown that the $S$-duality group permutes the different singularity loci of the moduli of $W\IP^{12}_{11226}$. We study the transformation under $S$-duality of the Calabi-Yau Yukawa couplings.

arXiv comment14 pages, Latex, 2 eps files. Comments, one more figure and references added

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