Filtrations on Springer fiber cohomology and Kostka polynomials.
Filtrations on Springer fiber cohomology and Kostka polynomials.
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DOI:
10.1007/s11005-017-1002-7
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发表时间:
2018
影响因子:
1.2
通讯作者:
Schedler T
中科院分区:
文献类型:
--
作者:
Bellamy G;Schedler T
We prove a conjecture which expresses the bigraded Poisson-de Rham homology of the nilpotent cone of a semisimple Lie algebra in terms of the generalized (one-variable) Kostka polynomials, via a formula suggested by Lusztig. This allows us to construct a canonical family of filtrations on the flag variety cohomology, and hence on irreducible representations of the Weyl group, whose Hilbert series are given by the generalized Kostka polynomials. We deduce consequences for the cohomology of all Springer fibers. In particular, this computes the grading on the zeroth Poisson homology of all classical finite W-algebras, as well as the filtration on the zeroth Hochschild homology of all quantum finite W-algebras, and we generalize to all homology degrees. As a consequence, we deduce a conjecture of Proudfoot on symplectic duality, relating in type A the Poisson homology of Slodowy slices to the intersection cohomology of nilpotent orbit closures. In the last section, we give an analogue of our main theorem in the setting of mirabolic D-modules.
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影响因子:
1.7
作者:
Bellamy, Gwyn;Ginzburg, Victor
通讯作者:
Ginzburg, Victor
影响因子:
1
作者:
Etingof, Pavel;Schedler, Travis
通讯作者:
Schedler, Travis
影响因子:
1
作者:
Finkelberg, Michael;Ginzburg, Victor
通讯作者:
Ginzburg, Victor
影响因子:
3.1
作者:
HOTTA, R;KASHIWARA, M
通讯作者:
KASHIWARA, M
影响因子:
2.2
作者:
Etingof, Pavel;Schedler, Travis
通讯作者:
Schedler, Travis