Why do we use the $\left(\tfrac{1}{2}, \tfrac{1}{2}\right)$ rep for spin $1$ particles and not $(0, 1)$?
38723
Can Poincare representations be embedded in non-standard Lorentz representations?
140576
Time reversal symmetry and T^2 = -1
7477
Why is the momentum of a particle $\gamma mv$?
111814
Precise connection between complexification of $\mathfrak{su}(2)$, $\mathfrak{so}(1,3)$ and $\mathfrak{sl}(2, \mathbb{C})$
140459
Why is $\left(e^{2\pi i}\right)^i \neq e^{-2 \pi}$?
83175
Infinitesimal transformations for a relativistic particle
22040
Why is there no theta-angle (topological term) for the weak interactions?
34788
Lagrangian for relativistic massless point particle
134718
Why is there extra minus sign in Feynman's rules for every closed fermionic loop?
215
Spinor dotted and undotted indices
90221
Regarding the Weyl spinor and its transformation properties
40965
$t_1$, $t_2$, $t_3$ Hermitian generators of $SU(2)$
38103
A No-Nonsense Introduction to Quantum Field Theory
107319
$F=ma$ contest problem on angular momentum
130497
Understanding Dirac's notation
155176
Tensor product vs. Cartesian Product for composite quantum systems
20503
Meaning of inner product $\langle \vec{r} | \psi(t)\rangle $