Crepant transformations for nonabelian GIT quotients

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• Rachel Webb
• Wednesday 29 November 2023, 14:15-15:15
• CMS MR13.

If you have a question about this talk, please contact Dhruv Ranganathan.

Geometric invariant theory (GIT) is a recipe for taking a quotient of a vector space by a linear action of a reductive group. The quotient also depends on a character of the group, though different characters will yield birational schemes (or stacks). I will explain one way to relate the Gromov-Witten theory of birational targets that arise in this fashion—-at least, I will explain one such example, namely the Grassmannian flop. A significant portion of the talk will be dedicated to understanding some basic examples and phenomena in GIT (as this turns out to be important for understanding the main theorem).

This talk is part of the Algebraic Geometry Seminar series.

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