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Multiplicity-free uq(n) coupling coefficients

S Alisauskas and Yu F Smirnov

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The coupling (Wigner-Clebsch-Gordan) coefficients of the unitary quantum algebras uq(n) are considered. The tensorial properties of the generator powers and their ordered products, used in the explicit projectors and weight lowering procedures, are established. Different expressions for the multiplicity-free isofactors of uq(n) coupling coefficients (those coupling an arbitrary and symmetric representations) are derived. Explicit expression of the arbitrary isofactors in terms of their boundary values are proposed. Proportionality of the semistretched isofactors to the stretched q-recoupling coefficients of uq(n-1) (q-analogues of 9j-symbols) is demonstrated. The stretched isofactors of uq(3) are expressed in terms of Clebsch-Gordan coefficients of uq(2).


PACS

03.65.Fd Algebraic methods

MSC

15A90 Applications of matrix theory to physics

81R15 Operator algebra methods (See also 46Lxx, 81T05)

Subjects

Quantum information and quantum mechanics

Dates

Issue 17 (7 September 1994)



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