Filtrations of tilting modules and costalks of parity sheaves
Representation Theory
2020-07-27 v1
Abstract
Let G be a reductive algebraic group over a field k. When k=C, R.K.Brylinski constructed a filtration of weight spaces of a G module, using the action of a principal nilpotent element of the Lie algebra, and proved that this filtration corresponds to Lusztig's q-analogue of the weight multiplicity. Later, Ginzburg discovered that this filtration has an interesting geometric interpretation via the geometric Satake correspondence. The goal of this article is to generalize these results to positive characteristics.
Keywords
Cite
@article{arxiv.2007.12444,
title = {Filtrations of tilting modules and costalks of parity sheaves},
author = {Linyuan Liu},
journal= {arXiv preprint arXiv:2007.12444},
year = {2020}
}