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arXiv 1105.0702math.RTmath.AC
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基于Cohen-Macaulay近似和Soergel双模的Khovanov-Rozansky同调

Khovanov-Rozansky homology via Cohen-Macaulay approximations and Soergel bimodules

Hanno Becker

摘要:

这是作者的毕业论文。我们描述了一个简化的Khovanov-Rozansky的分类的量子sl(n)链接同调的建设使用的理论,极大的Cohen-Macaulay模超曲面奇点和组合学的Soergel双模。更精确地说,我们证明了与基本MOY-图相关的矩阵分解等于某些Soergel双模的Cohen-Macaulay逼近,并证明了只要所考虑的MOY-图不具有定向圈,Cohen-Macaulay逼近与张量积可交换.因此,与MOY-辫子相关联的矩阵分解等于与Mazorchuk和Stroppel的辫子相关联的BGG-范畴O上的内函子相对应的Soergel双模的Cohen-Macaulay近似。这减少了某些计算的范畴内的矩阵分解已知的组合的赫克代数。最后,我们将辫子闭包描述为某种Hochschild上同调,并证明了对应于多于n行的Young tableaux的不可分解Soergel双模具有平凡的Cohen-Macaulay逼近,这类似于范畴O上对应的投射函子在至多n个部分的抛物上的限制为零的事实.

英文摘要:

This is the author's diploma thesis. We describe a simplification in the construction of Khovanov-Rozansky's categorification of quantum sl(n) link homology using the theory of maximal Cohen-Macaulay modules over hypersurface singularities and the combinatorics of Soergel bimodules. More precisely, we show that the matrix factorizations associated to basic MOY-graphs equal Cohen-Macaulay approximations of certain Soergel bimodules, and prove that taking Cohen-Macaulay approximation commutes with tensor products as long as the MOY-graph under consideration does not possess oriented cycles. It follows that the matrix factorization associated to a MOY-braid equals the Cohen-Macaulay approximation of the Soergel bimodule corresponding to the endofunctor on BGG-category O associated to the braid by Mazorchuk and Stroppel. This reduces certain computations in the category of matrix factorizations to known combinatorics of the Hecke-algebra. Finally, we describe braid closure as some kind of Hochschild cohomology and prove that the indecomposable Soergel bimodules corresponding to Young tableaux with more than n rows have trivial Cohen-Macaulay approximation, in analogy to the fact that the corresponding projective functors on category O vanish on restriction to parabolics with at most n parts.

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