A non-compact real form of the E8 Lie algebra has G2 and F4 subalgebras which break down to strong su, electroweak su x u, gravitational so(3,1), the frame-Higgs, and three generations of fermions related by triality. The interactions and dynamics of these 1-form and Grassmann valued parts of an E8 superconnection are described by the curvature and action over a four dimensional base manifold.
https://www.researchgate.net/…/2217412_An_Exceptionally_Sim…
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