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

Maiden, J., Shiu, G. & Stefanski, B. (2006). D-brane Spectrum and K-theory Constraints of D=4, N=1 Orientifolds. Journal of High Energy Physics, 2006(04), article number 052. doi: 10.1088/1126-6708/2006/04/052


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.

Publication Type: Article
Subjects: Q Science > QC Physics
Departments: School of Science & Technology > Mathematics
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