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arXiv 0909.4905math.QAmath.RT
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扭曲q-Yangians的表示

Representations of twisted q-Yangians

Lucy Gow, Alexander Molev

摘要:

扭q-Yangians是与gl(N)相关的量子仿射代数的余理想子代数。本文证明了与辛李代数sp(2n)相联系的扭q-Yangian的有限维不可约表示的分类定理。这些表示通过它们的最高权或通过它们的Drinfeld多项式来参数化。在sp(2)的最简单情况下,我们给出了所有表示作为求值模的张量积的显式描述。我们证明了量子仿射代数和扭曲的q-杨格的庞加莱-伯克霍夫-维特定理的类似物。我们还重现了量子仿射代数的有限维不可约表示的分类定理的证明,依靠其R-矩阵表示。

英文摘要:

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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