A Short Note on the Poincaré Algebra
Friday, May 22nd, 2009As physicists, we learn that the Poincaré algebra has two Casimirs, [tex]p_\mu p^\mu[/tex] and [tex]W_\mu W^\mu[/tex], together describing the mass and spin of a particle. A standard question is then, "why does the algebra have two Casimirs?" and the standard answer is, "because it is a rank 2 algebra, for ...
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