On the category O for rational Cherednik algebras
Abstract
We study the category O of representations of the rational Cherednik algebra A attached to a complex reflection group W. We construct an exact functor, called Knizhnik-Zamolodchikov functor, from O to the category of H-modules, where H is the (finite) Iwahori-Hecke algebra associated to W. We prove that the Knizhnik-Zamolodchikov functor induces an equivalence between O/O_tor, the quotient of O by the subcategory of A-modules supported on the discriminant and the category of finite-dimensional H-modules. The standard A-modules go, under this equivalence, to certain modules arising in Kazhdan-Lusztig theory of ``cells'', provided W is a Weyl group and the Hecke algebra H has equal parameters. We prove that the category O is equivalent to the module category over a finite dimensional algebra, a generalized "q-Schur algebra" associated to W.
Cite
@article{arxiv.math/0212036,
title = {On the category O for rational Cherednik algebras},
author = {Victor Ginzburg and Nicolas Guay and Eric Opdam and Raphael Rouquier},
journal= {arXiv preprint arXiv:math/0212036},
year = {2015}
}
Comments
28 pp., LaTeX, final version, to appear in Invent. Math