Sculpting the Standard Model from low-scale Gauge-Higgs-Matter $E_8$ Grand Unification in ten dimensions

A model with complete supersymmetric unification of the Standard Model matter content, interactions and families replication into a single $E_8$ gauge superfield in ten dimensions is presented. The gauge and extended Poincare symmetries are broken through compactification of the $\mathbb{T}^6/(\mathbb{Z}_3\times \mathbb{Z}_3)$ orbifold with Wilson lines, which reduces the original symmetry and matter content into those of the Standard Model. Proton decay is strongly suppressed automatically, while the unification scale is required to be as low as $10^6-10^9\ {\rm GeV}$ so that the corresponding physics may be potentially accessible and testable by future collider measurements. Such a low-scale Grand Unification concept yields a highly-constrained and predictive New Physics framework in a minimal and phenomenologically testable and consistent way.