D-brane Spectrum and K-theory Constraints of D=4, N=1 Orientifolds

Abstract

We study the spectrum of stable BPS and non-BPS D-branes in Z_2 x Z_2 orientifolds for all choices of discrete torsion between the orbifold and orientifold generators. We compute the torsion K-theory charges in these D=4, N=1 orientifold models directly from worldsheet conformal field theory, and compare with the K-theory constraints obtained indirectly using D-brane probes. The K-theory torsion charges derived here provide non-trivial constraints on string model building. We also discuss regions of stability for non-BPS D-branes in these examples.

arXiv comment40 pages, 5 tables

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Cited by in corpus (7)

• Four-dimensional String Compactifications with D-Branes, Orientifolds and Fluxes
• D-brane Deconstructions in IIB Orientifolds
• Coisotropic D8-branes and Model-building
• Gauge Thresholds and Kaehler Metrics for Rigid Intersecting D-brane Models
• Intersecting D-Branes on Shift Z2 x Z2 Orientifolds
• Fractional Branes in Non-compact Type IIA Orientifolds
• Exactly stable non-BPS spinors in heterotic string theory on tori