Representations of twisted q-Yangians

Details Representations of twisted q-Yangians Representations of twisted q-Yangians

2009-09-27

arxiv.org/abs/0909.4905v2

Selecta Math. 16 (2010), 439-499

Mathematics

Quantum Algebra

60 pages, minor corrections are made, references are added

Scientific paper

The twisted q-Yangians are coideal subalgebras of the quantum affine algebra associated with gl(N). We prove a classification theorem for finite-dimensional irreducible representations of the twisted q-Yangians associated with the symplectic Lie algebras sp(2n). The representations are parameterized by their highest weights or by their Drinfeld polynomials. In the simplest case of sp(2) we give an explicit description of all the representations as tensor products of evaluation modules. We prove analogues of the Poincare-Birkhoff-Witt theorem for the quantum affine algebra and for the twisted q-Yangians. We also reproduce a proof of the classification theorem for finite-dimensional irreducible representations of the quantum affine algebra by relying on its R-matrix presentation.

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