$K3$-Fibrations and Softly Broken $N=4$ Supersymmetric Gauge Theories

Abstract

Global geometry of $K3$-fibration Calabi-Yau threefolds, with Hodge number $h_{2,1}=r+1$, is used to define $N=4$ softly broken $SU(r+1)$ gauge theories, with the bare coupling constant given by the dual heterotic dilaton, and the mass of the adjoint hypermultiplet given by the heterotic string tension. The $U(r+1)$ Donagi-Witten integrable model is also derived from the $K3$-fibration structure, with the extra $U(1)$ associated to the heterotic dilaton. The case of $SU(2)$ gauge group is analyzed in detail. String physics beyond the heterotic point particle limit is partially described by the $N=4$ softly broken theory.

arXiv comment27 pages, Latex, no figures. Misprints corrected

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• On the Moduli Space of N = 2 Supersymmetric G_2 Gauge Theory
• Developments of theory of effective prepotential from extended Seiberg-Witten system and matrix models
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