# Tag Info

### Explanation of the meaning of those singlets, doublets

Abstractly, $\hat s_i$ are spin operators that act on general states $|s,s_z \rangle$ where the first and second labels refer to the total spin and spin-projection along an arbitrary axis respectively....
• 4,358
1 vote
Accepted

### Could the Universe have monster symmetry?

A cheap point is that there is no symmetry we can ever rule out. Just let all of the fields we've observed be singlets under that symmetry and posit that new fields transforming faithfully under it ...
• 5,164
1 vote
Accepted

• 172k

### Are the linear Lie groups matrices, tensors, or both?

Any type of mathematical object in the right representation can belong to a group as long as the necessary requirements are met. Tensors may in fact be brought in a form as to belong to some group. A ...
• 1,078