Why is $SU(3)$ and not $U(3)$ the correct gauge symmetry?
62506
Why $SU(3)$ and not $U(3)$?
35509
Noether's Theorem: Lie groups vs. Lie algebras; finite vs. infinitesimal symmetries
56206
Symmetry of the $3\times 3$ Cauchy Stress Tensor
133896
Which interaction violates T symmetry?
149535
What is the constraint on the Gauge Potential in the Covariant Gauges?
120490
Does magnetic monopole violate $U(1)$ gauge symmetry?
125980
Isomorphic Lie Algebra $so(4)$ and $su(2) \times su(2)$
71626
Superposition of distinct vevs in spontaneous symmetry breaking
108325
What's the relationship between $SL(2,\mathbb{C})$, $SU(2)\times SU(2)$ and $SO(1,3)$?
39244
References on the non-compositeness of the known elementary particles
38127
Equivalence between Kähler condition and $\partial_kg_{i\bar j} = \partial_ ig_{k\bar j}$
37126
Where does in GUT symmetry breaking $U(1)$ come from?
25854
$\mathbb{R}^3$ \ $\mathbb{Q}^3$ is union of disjoint lines. The lines are not in an axis diretion.
68014
Prove that $\mathfrak{su}(2)$ is not isomorphic to $\mathfrak{sl}(2,\mathbb R)$
120529
Relations between diffeomorphism symmetry theories and invariant $SU(N), N \rightarrow \infty$ theories
26110
Canonical isomorphism between $\mathfrak{so}(3)$ and $\mathbb R^3$ with vector cross product
107532
What is a gauge in a gauge theory?