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Schur–Weyl duality and centers of quantum Schur algebras
Journal of Pure and Applied Algebra ( IF 0.8 ) Pub Date : 2020-10-13 , DOI: 10.1016/j.jpaa.2020.106594
Qiang Fu

Let Uv(sln) be the quantized enveloping algebra of sln over C(v) and Ωv be the natural representation of Uv(sln), where v is an indeterminate. There is a natural right action of the Hecke algebra Hv(Sr) of the symmetric group Sr on Ωvr, commuting with the action of Uv(sln). It is well known that the natural algebra homomorphisms ζr:Uv(sln)Sv(n,r) and ηr:Hv(Sr)opEndUv(sln)(Ωvr) are surjective, where Sv(n,r)=EndHv(Sr)(Ωvr) is the quantum Schur algebras over C(v). Given an associative algebra A, let Z(A) be the center of A. In this paper, we prove that the maps ζr and ηr preserve the center. That is, we prove that ζr(Z(Uv(sln)))=Z(Imζr)=Z(Sv(n,r)) and ηr(Z(Hv(Sr)op))=Z(Imηr). It should be noted that when v is specialized to a primitive root of unity ε in C, ζr,ε(Z(Uε(sln))) is not equal to Z(Imζr,ε) in general, where Uε(sln) is quantum sln over C at parameter ε. Finally, we use bases of the center of the Hecke algebra Hv(Sr) to construct bases of the center of the quantum Schur algebra Sv(n,r).



中文翻译:

Schur–Weyl对偶性与量子Schur代数的中心

üvslñ 是...的量化包络代数 slñ 过度 CvΩv 是...的自然代表 üvslñ,其中v是不确定的。Hecke代数有自然的正确作用Hv小号[R 对称群的 小号[RΩv[R,与 üvslñ。众所周知,自然代数同态ζ[Rüvslñ小号vñ[Rη[RHv小号[R结束üvslñΩv[R 是排斥的,在哪里 小号vñ[R=结束Hv小号[RΩv[R 是量子Schur代数 Cv。给定一个关联代数一种,让 ž一种 成为...的中心 一种。在本文中,我们证明了这些地图ζ[Rη[R保留中心。也就是说,我们证明ζ[Ržüvslñ=žζ[R=ž小号vñ[Rη[RžHv小号[R=žη[R。应当注意的是,当v是专门统一的原根εCζ[Rεžüεslñ 不等于 žζ[Rε 一般来说,哪里 üεslñ 是量子的 slñ 过度 C在参数ε处。最后,我们使用Hecke代数中心的基数Hv小号[R 构造量子舒尔代数中心的基 小号vñ[R

更新日期:2020-10-17
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