منابع مشابه
Sigma-model anomalies in compact D=4, N=1 Type IIB orientifolds and Fayet-Iliopoulos terms
Compact Type IIB D = 4, N = 1 orientifolds have certain U(1) σ-model symmetries at the level of the effective Lagrangian. These symmetries are generically anomalous. We study the particular case of ZN orientifolds and find that these anomalies may be cancelled by a generalized Green-Schwarz mechanism. This mechanism works by the exchange of twisted RR-fields associated to the orbifold singulari...
متن کاملD = 4 , N = 1 orientifolds with vector structure
We construct compact type IIB orientifolds with discrete groups Z 4 , Z 6 , Z ′ 6 , Z 8 , Z 12 and Z ′ 12. These models are N = 1 supersymmetric in D = 4 and have vector structure. The possibility of having vector structure in Z N orientifolds with even N arises due to an alternative Ω-projection in the twisted sectors. Some of the models without vector structure are known to be inconsistent be...
متن کاملGauge and gravitational anomalies in D = 4 N = 1 orientifolds
The cancellation of U(1)-gauge and U(1)-gravitational anomalies in certain D = 4 N = 1 Type IIB orientifolds is analyzed in detail, from a string theory point of view. We verify the proposal that these anomalies are cancelled by a Green-Schwarz mechanism involving only twisted Ramond-Ramond fields. By factorizing one-loop partition functions, we also get the anomalous couplings of D-branes, O-p...
متن کاملAnomalous U(1)’s in Type I and Type IIB D=4, N=1 string vacua
We study the cancellation of U (1) anomalies in Type I and Type IIB D = 4, N = 1 string vacua. We first consider the case of compact toroidal Z N Type IIB orientifolds and then proceed to the non-compact case of Type IIB D3 branes at orbifold and orientifold singularities. Unlike the case of the heterotic string we find that for each given vacuum one has generically more than one U (1) with non...
متن کاملN = 1 No - Scale Supergravity from Iib Orientifolds
We describe the low-energy effective theory of N=1 spontaneously broken supegrav-ity obtained by flux-induced breaking in the presence of n D3 branes. This theory can be obtained by integrating out three massive gravitino multiplets in the hierarchical breaking N = 4 → 3 → 2 → 1 of a N=4 orientifold. This integration also eliminates the IIB complex dilaton. The resulting theory is a no-scale su...
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ژورنال
عنوان ژورنال: Nuclear Physics B
سال: 1998
ISSN: 0550-3213
DOI: 10.1016/s0550-3213(98)00666-x