Discrete Wilson Lines in F-Theory
arXiv:1010.2520
Abstract
F-theory models are constructed where the 7-brane has a non-trivial fundamental group. The base manifolds used are a toric Fano variety and a smooth toric threefold coming from a reflexive polyhedron. The discriminant locus of the elliptically fibered Calabi-Yau fourfold can be chosen such that one irreducible component it is not simply connected (namely, an Enriques surface) and supports a non-Abelian gauge theory.
22 pages, 4 figures, 3 tables