3
votes
How the factor of $1/2$ is purely conventional?
Lie Algebras are vector spaces, and the commutation relations in then are simply relations between elements of a basis of the vector space. Both in $SU(2)$, $SO(3)$, and in any other group, the ...
- 9,801
2
votes
Accepted
How do you multiply a 4x1 spinor by a $SU(3)$ matrix?
Color and Dirac/spinor indices are different types of indices. E.g. the quark field carries both.
- 172k
2
votes
Accepted
What is the relationship between spinors and rotating motion geometrically?
In short: the spinning fields correspond to representations of the Lorentz group that we see arising for an isolated rotating body.
Internal angular momentum as Lorentz group generator
As a ...
- 18.4k
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