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Toric surfaces with Kazhdan-Lusztig atlases

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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 using the stratification of Kazhdan-Lusztig varieties. 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.

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2018-05-30

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Algebraic Geometry; Representation Theory; Mathematics

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Union Local

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Knutson, Allen

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Sjamaar, Reyer
Barbasch, Dan Mihai

Degree Discipline

Mathematics

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Ph. D., Mathematics

Degree Level

Doctor of Philosophy

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Government Document

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dissertation or thesis

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