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arXiv 2210.02111math.AGmath.QA
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环面作用量的扭曲等变HKR定理与小量子群

Twisted equivariant HKR theorem for torus action and the small quantum group

Nicolas Hemelsoet

摘要:

证明了当环面$T$作用在光滑簇$X$上时,扭曲HKR同构是等变的.主要的结果是Bezrukavnikov- Lachowska同构,将小量子群的主块的Hochschild上同调与Springer分解$\widetilde{\mathcal{N}}$上的某些层上同调群联系起来,可以通过扭曲升级为环同构。

英文摘要:

We show that when a torus $T$ acts on a smooth variety $X$, the twisted HKR isomorphism is equivariant. The main consequence is that the Bezrukavnikov- Lachowska isomorphism, relating the Hochschild cohomology of the principal block of the small quantum group to certain sheaf cohomology groups on the Springer resolution $\widetilde{\mathcal{N}}$ , can be upgraded to a ring isomorphism by a twist.

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