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arXiv math/0608234math.RTmath.GT
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抛物O类,Grassmannian上的反常层,Springer纤维和Khovanov同调

Parabolic category O, perverse sheaves on Grassmannians, Springer fibres and Khovanov homology

Catharina Stroppel

摘要:

对gl(n,C)的固定抛物子代数p,证明了抛物范畴O的主块O(p)的中心自然同构于相应Springer纤维的上同调环.我们给出了极大抛物p的O(p)的一个图解描述,并给出了Grassmannian上反常层范畴PervB(G(n,n))的Braden描述的一个显式同构.因此,Khovanov代数H^n被实现为Perv_B(G(n,n))中某个对象的自同态环,它在局部化和Riemann-Hilbert对应下对应于相应范畴$O(p)$中的满投射-内射模。从那里可以推导出Khovanov的缠结不变量是通过限制从涉及范畴O的更一般的函子不变量中获得的。

英文摘要:

For a fixed parabolic subalgebra p of gl(n,C) we prove that the centre of the principal block O(p) of the parabolic category O is naturally isomorphic to the cohomology ring of the corresponding Springer fibre. We give a diagrammatic description of O(p) for maximal parabolic p and give an explicit isomorphism to Braden's description of the category Perv_B(G(n,n)) of perverse sheaves on Grassmannians. As a consequence Khovanov's algebra H^n is realised as the endomorphism ring of some object from Perv_B(G(n,n)) which corresponds under localisation and the Riemann-Hilbert correspondence to a full projective-injective module in the corresponding category $O(p)$. From there one can deduce that Khovanov's tangle invariants are obtained from the more general functorial invariants involving category O by restriction.

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