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arXiv 0909.2729math.RT
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范畴$\mathcal{O}$,II的一些同调性质

Some homological properties of the category $\mathcal{O}$, II

Volodymyr Mazorchuk

摘要:

我们表明,在充分的一般性,Lusztig的$\mathbf{a}$ -功能描述的投射维数的不可分解倾斜模块和不可分解的内射模在经常块的BGG类别$\mathcal{O}$,证明了一个猜想从第一篇论文。同时证明了投射函子下的单模的象在导出范畴中可用倾斜模的线性复形表示。这些复形又可以被解释为范畴$\mathcal{O}$的Koszul对偶中的投射函子下的单模的像。最后,我们描述了占主导地位的投射模,也投射-内射模的$\mathcal{O}$的一些子范畴,并显示如何可以使用分类分解的正则表示的Weyl群成一个直接和的细胞模块,扩展的结果已知的对称群(类型$A$)。

英文摘要:

We show, in full generality, that Lusztig's $\mathbf{a}$-function describes the projective dimension of both indecomposable tilting modules and indecomposable injective modules in the regular block of the BGG category $\mathcal{O}$, proving a conjecture from the first paper. On the way we show that the images of simple modules under projective functors can be represented in the derived category by linear complexes of tilting modules. These complexes, in turn, can be interpreted as the images of simple modules under projective functors in the Koszul dual of the category $\mathcal{O}$. Finally, we describe the dominant projective module and also projective-injective modules in some subcategories of $\mathcal{O}$ and show how one can use categorification to decompose the regular representation of the Weyl group into a direct sum of cell modules, extending the results known for the symmetric group (type $A$).

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