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arXiv 1607.04034math.RT
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关于$\OSPrn$的有限维表示范畴:I部分

On the category of finite-dimensional representations of $\OSPrn$: Part I

Michael Ehrig, Catharina Stroppel

摘要:

研究了正交辛李超群OSP(r)的有限维模范畴F的组合学|2n)。特别地,我们给出了两个投射模之间同态空间维数的正计数公式。这改进了Gruson和Serganova的早期结果。此外,对于F的每个块B,我们构造了一个代数A(B),它的模范畴与B共享组合学。它是D型Khovanov代数的一个适当极限的子商。这将证明A(B)同构于B的极小投射生成元的自同态代数。这提供了从F到B型或D型抛物范畴O(其中极大抛物范畴为A型)、到B/D型各向同性格拉斯曼几何以及到C/D型施普林格纤维的直接联系。我们还指出了为什么F不是一般的最高权。

英文摘要:

We study the combinatorics of the category F of finite-dimensional modules for the orthosymplectic Lie supergroup OSP(r|2n). In particular we present a positive counting formula for the dimension of the space of homomorphism between two projective modules. This refines earlier results of Gruson and Serganova. Moreover, for each block B of F we construct an algebra A(B) whose module category shares the combinatorics with B. It arises as a subquotient of a suitable limit of type D Khovanov algebras. It will turn out that A(B) is isomorphic to the endomorphism algebra of a minimal projective generator of B. This provides a direct link from F to parabolic categories O of type B or D, with maximal parabolic of type A, to the geometry of isotropic Grassmannians of types B/D and to Springer fibres of types C/D. We also indicate why F is not highest weight in general.

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