Comments on Gepner Models and Type I Vacua in String Theory

Abstract

We construct open descendants of Gepner models, concentrating mainly on the six-dimensional case, where they give type I vacua with rich patterns of Chan-Paton symmetry breaking and various numbers of tensor multiplets, including zero. We also relate the models in $D<10$ without open sectors, recently found by other authors, to the generalized Klein-bottle projections allowed by the crosscap constraint.

13 pages, LATEX

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• Completeness Conditions for Boundary Operators in 2D Conformal Field Theory
• Heterotic - type I superstring duality and low-energy effective actions

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