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arXiv 1902.07682math.RTmath.QA
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关于对应于B型Hecke代数的$q$ -Schur代数

On $q$-Schur algebras corresponding to Hecke algebras of type B

Chun-Ju Lai, Daniel K. Nakano, Ziqing Xiang

摘要:

本文研究了B型$q$ -Schur代数,它是利用A型量子群的余理想子代数构造的.给出了一个坐标代数型构造,使我们能够将这些$q$ -Schur代数实现为某些分次余代数的$d$次分支的代数.在适当的条件下证明了一个同构定理,证明了表示论可化为A型$q$ -Schur代数.这使作者能够解决这些代数的胞腔性,拟遗传性和表示类型的问题。后来证明这些代数实现了B型Hecke代数的$1$ -忠实拟遗传覆盖。作为进一步的结果,作者证明了这些代数是Morita等价于Rouquier的有限维代数,这些代数产生于B型外尔群的有理Cherednik代数的范畴${\mathcal O}$。特别地,我们引入了一个Schur型函子,它标识了B型Knizhnik-Zamolodchikov函子。

英文摘要:

In this paper the authors investigate the $q$-Schur algebras of type B that were constructed earlier using coideal subalgebras for the quantum group of type A. The authors present a coordinate algebra type construction that allows us to realize these $q$-Schur algebras as the duals of the $d$th graded components of certain graded coalgebras. Under suitable conditions an isomorphism theorem is proved that demonstrates that the representation theory reduces to the $q$-Schur algebra of type A. This enables the authors to address the questions of cellularity, quasi-hereditariness and representation type of these algebras. Later it is shown that these algebras realize the $1$-faithful quasi hereditary covers of the Hecke algebras of type B. As a further consequence, the authors demonstrate that these algebras are Morita equivalent to Rouquier's finite-dimensional algebras that arise from the category ${\mathcal O}$ for rational Cherednik algebras for the Weyl group of type B. In particular, we have introduced a Schur-type functor that identifies the type B Knizhnik-Zamolodchikov functor.

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