Anomaly cancelations in orientifolds with quantized B-flux

• Published in: Nuclear physics. B Vol. 569; no. 1; pp. 329 - 361
• Main Authors: Buchel, Alex, Shiu, Gary, Tye, S.-H.Henry
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 13.03.2000
• Subjects: 11.25
• ISSN: 0550-3213; 1873-1562
• DOI: 10.1016/S0550-3213(99)00647-1

We consider anomaly cancelations in Type IIB orientifolds on T 4/ Z N with quantized NS–NS sector background B-flux. For a rank b B-flux on T 4 ( b is always even) and when N is even, the cancelation requires a 2 b/2 multiplicity of states in the 59-open string sector. We identify the twisted sector R–R scalars and tensor multiplets which are involved in the Green–Schwarz mechanism. We give more details of the construction of these models and argue that consistency with the 2 b/2 multiplicity of 59-sector states requires a modification of the relation between the open string 1-loop channel modulus and the closed string tree channel modulus in the 59-cylinder amplitudes.