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Full exceptional collections of vector bundles on linear GIT quotients

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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 XssX and a quotient Xss/G. The key motivation of the work in this thesis is to determine when the derived category of coherent sheaves on the GIT quotient Xss/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.

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108 pages

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2023-08

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Halpern-Leistner, Daniel

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Berest, Yuri
Zakharevich, Inna

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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