> non-relativistic field equations of the Standard Model If you're using the non-relativistic approximation, most of the Standard Model is irrelevant since you

> non-relativistic field equations of the Standard Model If you're using the non-relativistic approximation, most of the Standard Model is irrelevant since you're limited to interaction energies much less than the rest mass of the lightest particle involved. You're basically looking at the low energy regime of QED, or straightforward non-relativistic QM with an appropriate potential in the Hamiltonian and no pretense of even trying to derive things from an underlying QFT model.