AIP Digital Archive
All Z2×Z2-graded contractions preserving space isotropy and the grading induced by the time reversal aitch-theta and the discrete canonical transformation K exchanging coordinates and momenta are found for the Lie algebras C2≡sp(2,C), sp(2,R), C3≡sp(3,C), and sp(3,R). Some properties and physical aspects of these contractions are discussed, especially in connection with the algebraic formulation of nuclear collective models. © 1997 American Institute of Physics.
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