Hi there. I have a question. Different QFT books usually introduce de Simmetry Breaking mechanism something like this: 1) We have a local gauge theory. 2) The theory has a parameter which is usually positive but can be negative 3) If this parameter is, let's say, negative then the vacum is degenerate 4) We choose to express everything as a power series based on one of the posible vacum states My question is, when we apply this idea to Electroweak force, why we say that at low energy the 2 forces are separated and at high energies it is unified? Or more precisely, what I'm trying to understand is, what does the parameter mentioned in 2) have to do with Energy? What is confusing me is that the parameter mentioned in 2 is just a number, while the Energy is an operator! So how can I make that jump and say that it represents energy? Energy of what? of the system environment???