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(4), doi: 10.1088/1126-6708/2006/04/052

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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.

Item Type: Article
Subjects: Q Science > QC Physics
Divisions: School of Engineering & Mathematical Sciences > Department of Mathematical Science
Related URLs:
URI: http://openaccess.city.ac.uk/id/eprint/1022

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