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

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

2006-02-03

arxiv.org/abs/hep-th/0602038v2

JHEP0604:052,2006

Physics

High Energy Physics

High Energy Physics - Theory

40 pages, 5 tables

Scientific paper

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.

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