Fractional Branes, Confinement, and Dynamically Generated Superpotentials

Abstract

We examine the effects of instantons in four dimensional N=1 supersymmetric gauge theory by including D0-branes in type IIA brane constructions. We examine instanton generated superpotentials in supersymmetric QCD and find that they are due to a repulsive force between D4-branes bound to D0-branes ending on NS 5-branes. We study situations where instanton effects break supersymmetry such as the Intriligator-Thomas-Izawa-Yangagida model and relate this to a IIA brane construction. We also argue how confinement due to a condensate of fractional instantons manifests itself in Super Yang-Mills theory using fractional D0 branes, D4 branes, and NS strings.

19 pages, 2 figures, uses harvmac. References added

References in corpus (3)

• Branes And The Dynamics Of QCD
• Domain Walls in Supersymmetric Yang-Mills Theories
• Supersymmetric Gauge Theories with an Affine Quantum Moduli Space

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• String theory and the 4D/3D reduction of Seiberg duality. A Review
• On Exponential corrections to the 1/N expansion in two-dimensional Yang Mills theory
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• 4d/3d reduction of s-confining theories: the role of the "exotic" D instantons
• Comments on fractional instantons in N=2 gauge theories
• Type IIB 2-form Fields and Gauge Coupling Constant of 4D N=2 super QCD