The Biggest Ideas in the Universe, Video, Number 15, on Gauge Theory

George servinka says near the end of the biggest ideas in the universe, number 15, on gauge theory, that symmetry is both preserved and spontaneously broken. The mexican hat shows potential energy as non zeroa equal zero, and then it rolls down to zero potential energy at many points. Gauge in variance seems to prevent the particle exitations of these new fields you 're inventing from having mass. It predicts very strongly that the particles should be massless. And so it seems that if you have a gauge theory, you have massless particles. But we know that the strong interactions, or we thought we knew, strong ineractions, an weakiner actions, do not