E8(-24)

An Explicit Embedding of Gravity and the Standard Model in E8

If the geometry of our universe is fundamentally that of an E8(−24)
principal bundle, this symmetry must be broken, with the frame-Higgs part of the
connection attaining a vacuum expectation value, and the structure reducing to that
of gravity and the Standard Model. If E8(−24) unification is interpreted directly,
it predicts the existence of many new particles, including W0, Z0, and X bosons,
a rich Higgs sector, and the existence of mirror fermions.