Cornell University
Library
Cornell UniversityLibrary

eCommons

Help
Log In(current)
  1. Home
  2. Cornell University Graduate School
  3. Cornell Theses and Dissertations
  4. BOW VARIETIES: SYMPLECTIC REDUCTION, STRATIFICATIONS, AND POLYNOMIAL COUNTABILITY

BOW VARIETIES: SYMPLECTIC REDUCTION, STRATIFICATIONS, AND POLYNOMIAL COUNTABILITY

File(s)
Ji_cornellgrad_0058F_15496.pdf (411.25 KB)
Permanent Link(s)
https://doi.org/10.7298/9f4s-jz47
https://hdl.handle.net/1813/126676
Collections
Cornell Theses and Dissertations
Author
Ji, Yibo
Abstract

In this thesis, we study bow varieties with nonempty torus fixed points. We begin by presenting these varieties as symplectic reductions of a unipotent group. From this perspective, we further show that, up to a factor of affine spaces, bow varieties of this form can be realized as $\pi^{−1}(X)$ where $\pi$ is a moment map for $T^∗Fl$ and $X = \mathbb{U}_NX\mathbb{U}_N$.This realization allows us to construct a natural stratification that bridges different bow varieties. Using this stratification, we prove that bow varieties with nonempty torus fixed points are polynomial-count varieties. Moreover, we derive an formula for computing their mixed Hodge polynomials.

Description
91 pages
Date Issued
2026-05
Keywords
Bow variety
•
polynomial-count
•
symplectic reduction
Committee Chair
Knutson, Allen
Committee Member
Berest, Yuri
Halpern-Leistner, Daniel
Degree Discipline
Mathematics
Degree Name
Ph. D., Mathematics
Degree Level
Doctor of Philosophy
Rights
Attribution-NonCommercial-NoDerivatives 4.0 International
Rights URI
https://creativecommons.org/licenses/by-nc-nd/4.0/
Type
dissertation or thesis

Site Statistics | Help

About eCommons | Policies | Terms of use | Contact Us

copyright © 2002-2026 Cornell University Library | Privacy | Web Accessibility Assistance