Comments on open-string orbifolds with non-vanishing Bab

被引:142
作者
Angelantonj, C [1 ]
机构
[1] Ecole Polytech, Ctr Phys Theor, CNRS UMR 7644, F-91128 Palaiseau, France
[2] Ecole Normale Super, Phys Theor Lab, CNRS, Unite Mixte Rech, F-75231 Paris 05, France
关键词
open strings;
D O I
10.1016/S0550-3213(99)00662-8
中图分类号
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号
摘要
We study the effect of a non-vanishing flux for the NS-NS antisymmetric tensor in open-string orbifolds. As in toroidal models, the total dimension of the Chan-Paton gauge group is reduced proportionally to the rank of B-ab, both on D9- and on D5-branes, while the Mobius amplitude involves some signs that, in the Z(2) orbifold, allow one to connect: continuously U(n) groups to Sp(n) x Sp(n) groups on each set of D-branes. In this case, non-universal couplings between twisted scalars and gauge vectors arise, as demanded by the generalised Green-Schwarz mechanism. We also comment on the role of the NS-NS antisymmetric tensor in a recently proposed type I scenario, where supersymmetry is broken on the D-branes, while it is preserved in the bulk. (C) 2000 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:126 / 150
页数:25
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