Thanks a lot for your answer.
I guess his is exactly what I'm curious about.. which mechanisms can let the EWSB happen at different a different scale than GUT breaking?
Hello,
I don't know much about GUT physics, but I've been wondering whether these models usually breaks the grand unified symmetry to the standard model all at once, or multiple times at different energies. And in the case of multiple breakings, how many Higgs-like scalars are needed...