Springer Online Journal Archives 1860-2000
Abstract The irreducible multiplier corepresentations of the extended Poincaré groupP are, for positive and zero mass, determined by generalized inducing from a generalized little group. This approach is compared with the previous one of Wigner. Form〉0, and any spinj, a particular realization is noted which is manifestly covariant on all four components ofP. The choice of covering group forP is discussed, and reasons are given for preferring a group for whichS andT generate the quaternion group of order 8.
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