Toric surfaces with equivariant Kazhdan-Lusztig atlases
Abstract
A Kazhdan-Lusztig atlas, introduced by He, Knutson and Lu, on a stratified variety (V,Y) is a way of modeling the stratification Y of V locally on the stratification of Kazhdan-Lusztig varieties X^w_o \cap X_v by their intersection with opposite Schubert varieties X_u. We are interested in classifying smooth toric surfaces with Kazhdan-Lusztig atlases. This involves finding a degeneration of V to a union of Richardson varieties in the flag variety H/B_H of some Kac-Moody group H. We determine which toric surfaces have a chance at having a Kazhdan-Lusztig atlas by looking at their moment polytopes, then describe a way to find a suitable group H. More precisely, we find that (up to equivalence) there are 19 or 20 broken toric surfaces admitting simply-laced atlases, and that there are at most 7543 broken toric surfaces where H is any Kac-Moody group.
Keywords
Cite
@article{arxiv.1610.04667,
title = {Toric surfaces with equivariant Kazhdan-Lusztig atlases},
author = {Balazs Elek},
journal= {arXiv preprint arXiv:1610.04667},
year = {2017}
}
Comments
35 pages, 40 figures, shortened version of PhD thesis