Where does the extra $U(1)$ symmetry come from in spontaneous symmetry breaking?
37126
Where does in GUT symmetry breaking $U(1)$ come from?
60436
How are symmetries precisely defined?
24547
Steps for going from Polyakov action to low-energy effective action (SUGRA?) in String Theory
47515
How does the Higgs Boson gain mass itself?
11181
Counting degrees of freedom of gauge bosons
77742
Queries about rotational groups $\mathrm{SO}(3)$ and $\mathrm{SU}(2)$ in QM
128937
Lie theory and particle physics
123497
Quantum Field Theory without LSZ, how is it possible?
2813
What is (meant by) a non-compact $U(1)$ Lie group?
29152
Conversion of the Polyakov action into the Nambo-Goto action?
26125
Does the canonical commutation relation fix the form of the momentum operator?
38103
A No-Nonsense Introduction to Quantum Field Theory
36797
How do I construct the $SU(2)$ representation of the Lorentz Group using $SU(2)\times SU(2)\sim SO(3,1)$ ?
120490
Does magnetic monopole violate $U(1)$ gauge symmetry?
157779
What does the Jacobi identity impose on structure constants?
37291
Why does the branch cut of the self-energy begin at $2m$?
122603
How does $\mathcal E(\rho)=\mathrm{Tr}_{env}[U(\rho\otimes\rho_{env})U^\dagger]$ turn into $P_0\rho P_0+P_1\rho P_1$?