Luca Martucci, Francisco Morales, Daniel Ricci Pacifici
We discuss a class of type IIB supersymmetric vacua describing systems of three- and seven-branes characterized by non-perturbative dynamics. The solutions are specified by a set of holomorphic funtions defined over a complex plane with non-trivial U-duality monodromies. In the simplest setting, the solutions can be seen as a generalization of F-theory elliptic fibrations, where the torus fiber is replaced by a genus two Riemann surface with periods encoding the information on the axio-dilaton, the warp factor and the NS-NS and R-R fluxes.
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http://arxiv.org/abs/1207.6120
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