On functors associated to a simple root

Details On functors associated to a simple root On functors associated to a simple root

2004-10-14

arxiv.org/abs/math/0410339v2

Journal of Algebra 2007

Mathematics

Representation Theory

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Scientific paper

Associated to a simple root of a finite-dimensional complex semisimple Lie algebra, there are several endofunctors (defined by Arkhipov, Enright, Frenkel, Irving, Jantzen, Joseph, Mathieu, Vogan and Zuckerman) on the BGG category $\mathcal{O}_0$. We study their relations, compute cohomologies of their derived functors and describe the monoid generated by Arkhipov's and Joseph's functors and the monoid generated by Irving's functors. It turns out that the endomorphism rings of all elements in these monoids are isomorphic. We prove that the functors give rise to an action of the singular braid monoid on the bounded derived category of $\mathcal{O}_0$. We also use Arkhipov's, Joseph's and Irving's functors to produce new generalized tilting modules.

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