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arXiv 2310.04773math.RTmath.AGmath.QA
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辛李代数中幂零切片的等变形变理论

Equivariant deformation theory for nilpotent slices in symplectic Lie algebras

Filippo Ambrosio, Lewis Topley

AI总结:

针对辛李代数中双块若尔当形幂零轨道的Slodowy切片非通用泊松形变问题,证明其幂零Slodowy簇与D型同构,C型切片为$\u2124_2$-等变通用泊松形变且有非交换对应。

摘要:

Slodowy切片是其幂零部分的平坦泊松形变,Lehn-Namikawa-Sorger已证明,辛李代数中存在一类有趣的无限族幂零轨道,其切片并非其幂零部分的通用泊松形变。该族对应辛李代数中若尔当标准形有两个块的幂零轨道的切片。我们证明,与这些轨道相关的幂零Slodowy簇作为泊松$\u2102^\ imes$-簇,与D型中的幂零Slodowy簇同构。由此可得,C型中的通用泊松形变是D型中的一个切片。当两个若尔当块的大小均为奇数时,底层奇点具有来自D型实现的$\u2124_2$-对称性。我们证明,C型中的Slodowy切片是其幂零部分的$\u2124_2$-等变通用泊松形变。该结果还有非交换对应,将有限W-代数认定为通用等变量子化。

英文摘要:

The Slodowy slice is a flat Poisson deformation of its nilpotent part, and it was demonstrated by Lehn-Namikawa-Sorger that there is an interesting infinite family of nilpotent orbits in symplectic Lie algebras for which the slice is not the universal Poisson deformation of its nilpotent part. This family corresponds to slices to nilpotent orbits in symplectic Lie algebras whose Jordan normal form has two blocks. We show that the nilpotent Slodowy varieties associated to these orbits are isomorphic as Poisson $\mathbb{C}^\times$-varieties to nilpotent Slodowy varieties in type D. It follows that the universal Poisson deformation in type C is a slice in type D. When both Jordan blocks have odd size the underlying singularity is equipped with a $\mathbb{Z}_2$-symmetry coming from the type D realisation. We prove that the Slodowy slice in type C is the $\mathbb{Z}_2$-equivariant universal Poisson deformation of its nilpotent part. This result also has non-commutative counterpart, identifying the finite W-algebra as the universal equivariant quantization.

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