Why Lie algebras if what we care about in physics are groups?
Posted by Soap, at physics.stackexchange.com,
In physics, we want irreducible representations of the symmetry group of our system. However, one frequently sees…
The system is topological; so what?
Posted by AccidentalFourierTransform, at physics.stackexchange.com,
Lately I've been studying topological quantum field theory, mainly from mathematically oriented sources and, while I understand…
Why is the "actual" gauge group of the standard model $SU(3) \times SU(2) \times U(1) /N$?
Posted by Tim, at physics.stackexchange.com,
In this paper John Baez says the actual gauge group of the standard model is $SU(3) \times SU(2) \times U(1) /N$. Can someone…