Chiral Asymmetry in Four-Dimensional Open-String Vacua

Abstract

Starting from the type IIB string on the Z orbifold, we construct some chiral open-string vacua with N=1 supersymmetry in four dimensions. The Chan-Paton group depends on the (quantized) NS-NS antisymmetric tensor. The largest choice, SO(8)xSU(12)xU(1), has an anomalous U(1) factor whose gauge boson acquires a mass of the order of the string scale. The corresponding open-string spectrum comprises only Neumann strings and includes three families of chiral multiplets in the (8,12*) + (1,66) representation. A comparison is drawn with a heterotic vacuum with non-standard embedding, and some properties of the low-energy effective field theory are discussed.

12 pages, LaTeX, misprints corrected, version to appear in Physics Letters B

References in corpus (2)

• String Theory Dynamics In Various Dimensions
• A Note on the Green - Schwarz Mechanism in Open - String Theories

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