Special collision dynamics of massless fermions leading to confinement
  This is a theory for the fundamental structure of nature based on spinors as unique building blocks. Confinement of the spinors in particles is due uniquely to the dynamics of the collisions between them. The interaction operator contains only spin and momentum operators. The eigenfunctions of the interaction operator have negative as well as positive eigenvalues, limited in magnitude to the Planck energy. Interactions in one-center particles between spinors with eigenvalues of different sign tend to bring the energy of the particle closer to zero.   At the origin of the energy reduction through interaction is the spin precession, taking place when two spinors of different type come together. The model can explain the existence of stable particles and all the known forces, including gravitation. 
J.Witters