Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2001-11-19
Nucl.Phys.B636:197-224,2002
Physics
High Energy Physics
High Energy Physics - Theory
34 pages, latex, no figures, changed appendix on Spin(7) metrics, more references added
Scientific paper
10.1016/S0550-3213(02)00404-2
We discuss fluxes of RR and NSNS background fields in type II string compactifications on non-compact Calabi-Yau threefolds together with their dual brane description which involves bound states of branes. Simultaneously turning on RR and NSNS 2-form fluxes in an 1/2 supersymmetric way can be geometrically described in M-theory by a SL(2,Z) family of metrics of G(2) holonomy. On the other hand, if the flux configuration only preserves 1/4 of supersymmetries, we postulate the existence of a new eight-dimensional manifold with spin(7) holonomy, which does not seem to fit into the classes of known examples. The latter situation is dual to a 1/4 supersymmetric web of branes on the deformed conifold. In addition to the 2-form fluxes, we also present some considerations on type IIA NSNS 4-form and 6-form fluxes.
Curio Gottfried
Kors Boris
Lust Dieter
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