New N=1 supersymmetric 3-dimensional superstring vacua from U-manifolds

Making use of non-perturbative U-duality symmetries of type II strings we construct new `superstringʹ vacua in three dimensions with N=1 supersymmetry. This has an interpretation as compactifying formally from 13 dimensions (S-theory) on Calabi-Yau 5-folds possessing a T3×T2 fibration. We describe some part of the massless multiplets, given by the Hodge spectrum, and point to a corresponding 5-brane configuration.