Geometrically engineering the standard model: Locally unfolding three families out of E8

This paper extends and builds upon the results of, in which we described how to use the tools of geometrical engineering to deform geometrically engineered grand unified models into ones with lower symmetry. This top-down unfolding has the advantage that the relative positions of singularities giving rise to the many "low-energy" matter fields are related by only a few parameters which deform the geometry of the unified model. And because the relative positions of singularities are necessary to compute the superpotential, for example, this is a framework in which the arbitrariness of geometrically engineered models can be greatly reduced. In, this picture was made concrete for the case of deforming the representations of an SU5 model into their standard model content. In this paper we continue that discussion to show how a geometrically engineered 16 of SO10 can be unfolded into the standard model, and how the three families of the standard model uniquely emerge from the unfolding of a single, isolated E8 singularity.