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  4. Full exceptional collections of vector bundles on linear GIT quotients

Full exceptional collections of vector bundles on linear GIT quotients

File(s)
Kemboi_cornellgrad_0058F_13845.pdf (787.66 KB)
Permanent Link(s)
https://doi.org/10.7298/s7bh-6z09
https://hdl.handle.net/1813/114669
Collections
Cornell Theses and Dissertations
Author
Kemboi, Kimoi
Abstract

Given a reductive group $G$, a linear $G$-representation $X$, and a choice of $G$-linearized line bundle on $X$, Geometric Invariant Theory (GIT) produces an open subset $X^{\rm ss} \subset X$ and a quotient $X^{\rm ss}/G$. The key motivation of the work in this thesis is to determine when the derived category of coherent sheaves on the GIT quotient $X^{\rm ss}/G$ admits a full exceptional collection consisting of vector bundles. A full exceptional collection is an important structure on a derived category with many valuable implications. For instance, such a collection produces a basis for the Grothendieck group and the Hochschild Homology of the derived category. Using ideas from local cohomology and equivariant geometry, we produce a large class of linear GIT quotients with $G$ of rank $2$ that admit a full exceptional collection. These vector bundles will come from irreducible $G$-representations whose weights lie in a particular “window” in the weight space of $G$. When $G$ has higher rank, we produce a finite list of tautological vector bundles that generate the derived category. These vector bundles do not form a full exceptional collection, but their classes still generate the Grothendieck group.

Description
108 pages
Date Issued
2023-08
Committee Chair
Halpern-Leistner, Daniel
Committee Member
Berest, Yuri
Zakharevich, Inna
Degree Discipline
Mathematics
Degree Name
Ph. D., Mathematics
Degree Level
Doctor of Philosophy
Type
dissertation or thesis
Link(s) to Catalog Record
https://newcatalog.library.cornell.edu/catalog/16219172

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