The Nonstandard Deformation U'_q(so_n) For q a Root of Unity

Details The Nonstandard Deformation U'_q(so_n) For q a Root of Unity The Nonstandard Deformation U'_q(so_n) For q a Root of Unity

2000-07-17

arxiv.org/abs/math/0007105v1

Mathematics

Quantum Algebra

17 pages, LaTeX

Scientific paper

We describe properties of the nonstandard q-deformation U'_q(so_n) of the universal enveloping algebra U(so_n) of the Lie algebra so_n which does not coincide with the Drinfeld--Jimbo quantum algebra U_q(so_n). In particular, it is shown that there exists an isomorphism from U'_q(so_n) to U_q(sl_n) and that finite dimensional irreducible representations of U'_q(so_n) separate elements of this algebra. Irreducible representations of the algebras U'_q(so_n) for q a root of unity q^p=1 are given. The main class of these representations act on p^N-dimensional linear space (where N is a number of positive roots of the Lie algebra so_n) and are given by r=dim so_n complex parameters. Some classes of degenerate irreducible representations are also described.

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