Strengths of Strong and Other Interactions

The requirement of compatibility of vector-meson dominance and partial conservation of axial-vector current in ${\pi }^0\to 2\gamma$ decay [along with $\mathrm{SU}{\mathrm{}\left(6\right)\mathrm{}}_W$ symmetry] determines the absolute value of the $\rho \pi \pi$ coupling constant. The strength of strong interactions results inversely proportional to the number of postulated quarks. In dynamical models of spontaneous symmetry breaking the electromagnetic, weak, and gravitational interactions are found also to have strengths inversely proportional to the corresponding numbers of fundamental fermions.