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(Weinberg QFT, Vol 1, page 68)
He considers MassPositiveDefinite, in which case the Little Group is SO(3). He then gives the relations
Is it difficult to derive these relations? I'm asking this mainly because I haven't seen them anywhere other than in Weinberg's book.
Also, I'm finding them difficult to follow, as on one side of the equations the ##J## have two indices whereas on the other side they have only one index.
He considers MassPositiveDefinite, in which case the Little Group is SO(3). He then gives the relations
Is it difficult to derive these relations? I'm asking this mainly because I haven't seen them anywhere other than in Weinberg's book.
Also, I'm finding them difficult to follow, as on one side of the equations the ##J## have two indices whereas on the other side they have only one index.
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