ar X iv : h ep - t h / 07 01 20 4 v 1 2 2 Ja n 20 07 hep - th / 0701204 UPR - 1167 - T Twisting K 3 × T 2 Orbifolds
نویسندگان
چکیده
We construct a class of geometric twists for Calabi-Yau manifolds of Voisin-Borcea type (K3 × T )/Z2 and study the superpotential in a type IIA orientifold based on this geometry. The twists modify the direct product by fibering the K3 over T 2 while preserving the Z2 involution. As an important application, the Voisin-Borcea class contains T /(Z2 × Z2), the usual setting for intersecting D6 brane model building. Past work in this context considered only those twists inherited from T , but our work extends these twists to a subset of the blow-up modes. Our work naturally generalizes to arbitrary K3 fibered Calabi-Yau manifolds and to nongeometric constructions.
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