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arXiv 1111.7198math.RAmath.COmath.RT
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Drinfeld Orbifold代数

Drinfeld Orbifold Algebras

Anne V. Shepler, Sarah J. Witherspoon

摘要:

我们定义Drinfeld orbifold代数为滤过代数,它使由有限群在多项式环上的作用而产生的斜群代数(半直积)变形。它们同时推广了Weyl代数、分次(或Drinfeld)Hecke代数、有理Cherednik代数、辛反射代数和具有群作用的李代数的泛包络代数.给出了Drinfeld orbifold代数的代数和同调两种一般形式的参数定义的充要条件。我们解释之间的联系Hochschild上同调和庞加莱-伯克霍夫-维特财产明确(使用Gerstenhaber括号)。我们还分类了那些变形的斜群代数出现的Drinfeld orbifold代数和阿贝尔群的应用。

英文摘要:

We define Drinfeld orbifold algebras as filtered algebras deforming the skew group algebra (semi-direct product) arising from the action of a finite group on a polynomial ring. They simultaneously generalize Weyl algebras, graded (or Drinfeld) Hecke algebras, rational Cherednik algebras, symplectic reflection algebras, and universal enveloping algebras of Lie algebras with group actions. We give necessary and sufficient conditions on defining parameters to obtain Drinfeld orbifold algebras in two general formats, both algebraic and homological. We explain the connection between Hochschild cohomology and a Poincare-Birkhoff-Witt property explicitly (using Gerstenhaber brackets). We also classify those deformations of skew group algebras which arise as Drinfeld orbifold algebras and give applications for abelian groups.

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