Cornell University
Library
Cornell UniversityLibrary

eCommons

Help
Log In(current)
  1. Home
  2. Cornell University Graduate School
  3. Cornell Theses and Dissertations
  4. Displaceability in Symplectic Geometry

Displaceability in Symplectic Geometry

File(s)
DeKeersmaeker_cornellgrad_0058F_12245.pdf (878.53 KB)
Permanent Link(s)
https://doi.org/10.7298/hbcr-0m97
https://hdl.handle.net/1813/103047
Collections
Cornell Theses and Dissertations
Author
De Keersmaeker, Frederik
Abstract

We use a topological condition by Albers that is sufficient for nondisplaceability to describe a large class of nondisplaceable Lagrangians, namely the anti-diagonals of closed monotone symplectic manifolds. We provide some examples of closed monotone symplectic manifolds of Euler characteristic zero. Furthermore, we study the displaceability of fibers of the bending flow system on equilateral pentagon space. Besides torus fibers over points in the interior of moment map image, this completely integrable system has two Lagrangian sphere fibers over boundary points of the moment polytope. They are nondisplaceable for topological reasons. Most of the regular torus fibers are displaceable using McDuff’s probes technique. We prove that the central torus fiber is nondisplaceable by showing that we can lift a Hamiltonian diffeomorphism displacing it to a Hamiltonian diffeomorphism displacing the central torus fiber of the Gelfand-Cetlin system on the complex Grassmannian of 2-planes. This fiber is known to be nondisplaceable.

Description
125 pages
Date Issued
2020-08
Committee Chair
Holm, Tara
Committee Member
Sjamaar, Reyer
Knutson, Allen
Degree Discipline
Mathematics
Degree Name
Ph. D., Mathematics
Degree Level
Doctor of Philosophy
Type
dissertation or thesis
Link(s) to Catalog Record
https://catalog.library.cornell.edu/catalog/13277985

Site Statistics | Help

About eCommons | Policies | Terms of use | Contact Us

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