期刊
NUCLEAR PHYSICS B
卷 576, 期 1-3, 页码 285-312出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0550-3213(00)00059-6
关键词
Type I compactifications; sigma-model anomalies; orientifolds
Compact Type IIB D = 4, N = 1 orientifolds have certain U(1) sigma-model symmetries at the level of the effective Lagrangian. These symmetries are generically anomalous. We study the particular case of Z(N) 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 singularities and it requires the mixing between twisted and untwisted moduli of the orbifold. As a consequence, the Fayet-Iliopoulos terms which are present for the gauged anomalous LT(1)'s of the models get an additional untwisted modulus dependent piece at the tree level. (C) 2000 Elsevier Science B.V. All rights reserved.
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