Springer representations on the Khovanov Springer varieties
Springer representations on the Khovanov Springer varieties
复制标题
施普林格对霍瓦诺夫施普林格品种的介绍
DOI:
10.1017/s0305004111000132
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发表时间:
2008
影响因子:
0.8
通讯作者:
Julianna Tymoczko
中科院分区:
文献类型:
--
作者:
Heather M. Russell;Julianna Tymoczko
Abstract Springer varieties are studied because their cohomology carries a natural action of the symmetric group Sn and their top-dimensional cohomology is irreducible. In his work on tangle invariants, Khovanov constructed a family of Springer varieties Xn as subvarieties of the product of spheres (S2)n. We show that if Xn is embedded antipodally in (S2)n then the natural Sn-action on (S2)n induces an Sn-representation on the image of H∗(Xn). This representation is the Springer representation. Our construction admits an elementary (and geometrically natural) combinatorial description, which we use to prove that the Springer representation on H∗(Xn) is irreducible in each degree. We explicitly identify the Kazhdan-Lusztig basis for the irreducible representation of Sn corresponding to the partition (n/2, n/2).