What are the Fundamental Matter Particles?
Quantum theory and Lorentz structure are the twin pillars of fundamental physics today. With quantum theory kept and Lorentz structure replaced by Euclidean Jordan algebra --- a more fundamental structure, one naturally arrives at the notion of abstract fundamental matter particles. These abstract particles fall into distinct abstract universes according to their symmetry groups. If it is assumed that the charged particle count for such an abstract universe is 32, then this abstract universe must be conformally-symmetric and 11-dimensional Lorentzian when it is extremely hot; furthermore, it matches our real world universe in quite a few aspects, from the charged particle content to the existence of dark matter. Based on this match, a few predictions can be made: 1) the electric-weak force symmetry must be broken if the macroscopic spatial dimension is 2 or higher, 2) there are infinitely many generations of quarks and leptons, and 3) there exists a 5th fundamental force. This 5th force predicts quark mixing and the related CP violation because it transforms quarks among its various generations and violates the CP symmetry. A quantitative check concerning the Cabibbo-Kobayashi-Maskawa matrix entries shows a good agreement between experiments and the 5th force based computations.