Comments on Gepner Models and Type I Vacua in String Theory

Angelantonj, C.; Bianchi, M.; Pradisi, G.; Sagnotti, A.; Stanev, Ya. S.

Comments on Gepner Models and Type I Vacua in String Theory

Authors

Description

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