New posts in Representation Theory

What does it mean to transform as a scalar or vector?

Does the $\bf{1+3}$ representation of $SU(2)$ also represent $SU(2)\times SU(2)$?

What's the relationship between $SL(2,\mathbb{C})$, $SU(2)\times SU(2)$ and $SO(1,3)$?

Dirac, Weyl and Majorana Spinors

Rotation Group and Lorentz Group

Can a spinor be defined as any quantity which transforms linearly under Lorentz transformations?

Idea of Covering Group

$\mathrm{SU(3)}$ decomposition of $\mathbf{3} \otimes \mathbf{\bar{3}} = \mathbf{8} \oplus \mathbf{1}$?

Problem counting spin states

When are there enough Casimirs?