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  4. Toric surfaces with Kazhdan-Lusztig atlases

Toric surfaces with Kazhdan-Lusztig atlases

File(s)
Elek_cornellgrad_0058F_10829.pdf (4.9 MB)
Permanent Link(s)
https://doi.org/10.7298/X4NZ85WK
https://hdl.handle.net/1813/59476
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Cornell Theses and Dissertations
Author
Elek, Balazs
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.

Date Issued
2018-05-30
Keywords
Algebraic Geometry
•
Representation Theory
•
Mathematics
Committee Chair
Knutson, Allen
Committee Member
Sjamaar, Reyer
Barbasch, Dan Mihai
Degree Discipline
Mathematics
Degree Name
Ph. D., Mathematics
Degree Level
Doctor of Philosophy
Type
dissertation or thesis

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