A D=4 N=1 Orbifold of Type I Strings

Abstract

We consider the propagation of Type I open superstrings on orbifolds with four non-compact dimensions and $N=1$ supersymmetry. In this paper, we concentrate on a non-trivial Z_2xZ_2 example. We show that consistency conditions, arising from tadpole cancellation and algebraic sources, require the existence of three sets of Dirichlet 5-branes. We discuss fully the enhancements of the spectrum when these 5-branes intersect. An amusing attribute of these models is the importance of the tree-level (in Type I language) superpotential to the consistent relationship between Higgsing and the motions of 5-branes.

24 pages, uses LaTeX and epsf.sty

References in corpus (7)

• Dirichlet-Branes and Ramond-Ramond Charges
• Strong Coupling Expansion Of Calabi-Yau Compactification
• D-branes, Quivers, and ALE Instantons
• Consistency Conditions for Orientifolds and D-Manifolds
• K3 Orientifolds
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