Quiver varieties and symmetric pairs

Quiver varieties and symmetric pairs
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DOI:
10.1090/ert/522
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发表时间:
2019
影响因子:
0.6
通讯作者:
Li, Yiqiang
Li, Yiqiang
中科院分区:
数学3区
文献类型:
--
作者:
Li, Yiqiang

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研究了辛形态下的Nakajima变异体及其反辛近亲的不动点轨迹,它们是由双线性形式定义的图同构、反射函子和转置组成的。这些子变体为对称对的几何表示理论提供了一个天然的家园。特别地,辛不动点子变体的steinberg型变体的上同调与子代数在对称对中的全称包络代数有推测关系。利用后一种辛子变种进一步构造了扭曲Yangian在Nakajima变种环面等变上同调上的作用。在典型情况下,这些子变体为经典群和相关对称空间的幂零slow切片的部分施普林格分辨率提供了一个颤振模型,从而导致矩形对称和Kraft-Procesi行/列移除约简的改进。参考文献
We study fixed-point loci of Nakajima varieties under symplectomorphisms and their antisymplectic cousins, which are compositions of a diagram isomorphism, a reflection functor, and a transpose defined by certain bilinear forms. These subvarieties provide a natural home for geometric representation theory of symmetric pairs. In particular, the cohomology of a Steinberg-type variety of the symplectic fixed-point subvarieties is conjecturally related to the universal enveloping algebra of the subalgebra in a symmetric pair. The latter symplectic subvarieties are further used to geometrically construct an action of a twisted Yangian on a torus equivariant cohomology of Nakajima varieties. In the typecase, these subvarieties provide a quiver model for partial Springer resolutions of nilpotent Slodowy slices of classical groups and associated symmetric spaces, which leads to a rectangular symmetry and a refinement of Kraft–Procesi row/column removal reductions. References
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