All Questions
2
questions
37
votes
2
answers
7k
views
What is (meant by) a non-compact $U(1)$ Lie group?
In John Preskill's review of monopoles he states on p. 471
Nowadays, we have another way of understanding why electric charge is quantized. Charge is quantized if the electromagnetic $U(l)_{\rm em}$...
- 16.9k
5
votes
2
answers
252
views
Theory of weak interactions
Why don't we have a theory solely of weak interaction, like QED or QCD? I.e $SU(2)$ gauge theory describing neutrinos and massive $W^{+-}$ bosons.
But instead we have a unified electroweak theory ...
- 343