fluxes and exotic branes
arXiv:1610.07975 · doi:10.1007/JHEP12(2016)114
Abstract
We consider the superpotential generated in type-II orientifold models by non-geometric fluxes. In particular, we focus on the family of fluxes, that are related by T-duality transformations to the S-dual of the flux. We determine the general rule that transforms a given flux in this family under a single T-duality transformation. This rule allows to derive a complete expression for the superpotential for both the IIA and the IIB theory for the particular case of a orientifold. We then consider how these fluxes modify the generalised Bianchi identities. In particular, we derive a fully consistent set of quadratic constraints coming from the NS-NS Bianchi identities. On the other hand, the flux Bianchi identities induce tadpoles, and we determine a set of exotic branes that can be consistently included in order to cancel them. This is achieved by determining a universal transformation rule under T-duality satisfied by all the branes in string theory.
29 pages. Refs. added, end of subsection 4.2 improved, other minor changes. Version published on JHEP
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