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arXiv 1502.05671math.RT
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辛反射代数的Dirac上同调

Dirac cohomology for symplectic reflection algebras

Dan Ciubotaru

摘要:

在Drinfeld引入的Hecke代数的框架下,统一定义了Dirac算子和Dirac上同调的概念。我们推广了Lusztig分次仿射Hecke代数的Dirac上同调理论。我们将这些结构的情况下辛反射代数定义的Etingof-Ginzburg,特别是合理的Cherednik代数的真实或复杂的反射群参数t,c。作为应用,我们给出了O类模的幺正性准则,并证明了Calogero-Moser空间的0-纤维可以用Vogan最初定义的一种“Dirac态射”来描述实半单李群。

英文摘要:

We define uniformly the notions of Dirac operators and Dirac cohomology in the framework of the Hecke algebras introduced by Drinfeld. We generalize in this way the Dirac cohomology theory for Lusztig's graded affine Hecke algebras. We apply these constructions to the case of symplectic reflection algebras defined by Etingof-Ginzburg, particularly to rational Cherednik algebras for real or complex reflection groups with parameters t,c. As applications, we give criteria for unitarity of modules in category O and we show that the 0-fiber of the Calogero-Moser space admits a description in terms of a certain "Dirac morphism" originally defined by Vogan for representations of real semisimple Lie groups.

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