Constructing the ultimate theory of grand unification

TL;DR

This paper provides a logical foundation for the unique structure of fermionic multiplets in an $E_8$ grand unified theory, integrating known particle physics facts and supersymmetry.

Contribution

It offers a novel theoretical justification for the specific composition of fermionic multiplets in the $E_8$ unification framework.

Findings

Supports the $E_8$ gauge group as the basis for grand unification

Aligns the theory with known lepton and quark phenomenology

Incorporates neutrino mass scales and supersymmetry

Abstract

In accordance with known phenomenological facts on leptons and quarks in the Standard Model as well as on the scale of neutrino masses and introducing the supersymmetry, we logically substantiate the unique composition of fundamental representation for the fermionic multiplet of gauge group $E_8$.