BPS orientifold planes from crosscap states in Calabi-Yau compactifications

Details BPS orientifold planes from crosscap states in Calabi-Yau compactifications BPS orientifold planes from crosscap states in Calabi-Yau compactifications

2003-06-10

arxiv.org/abs/hep-th/0306091v2

JHEP 0311:019,2003

Physics

High Energy Physics

High Energy Physics - Theory

19 pages, LaTeX; text corrected and improved; section 4 rewritten and expanded to clarify calculations; results unchanged

Scientific paper

10.1088/1126-6708/2003/11/019

We use the results of hep-th/0007174 on the simple current classification of open unoriented CFTs to construct half supersymmetry preserving crosscap states for rational Calabi-Yau compactifications. We show that the corresponding orientifold fixed planes obey the BPS-like relation M=exp(i*phi)Q. To prove this relation, it is essential that the worldsheet CFT properly includes the degrees of freedom from the uncompactified space-time component. The BPS-phase phi can be identified with the automorphism type of the crosscap states. To illustrate the method we compute crosscap states in Gepner models with each k_i odd.

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