New derived symmetries induced by ring surjections (and crepant contractions) - Marina Godinho

Описание: This is a recorded version of the following talk from our "New Directions in Group Theory and Triangulated Categories" series. To receive updates about this series, or to suggest speakers (including yourself), please email me at [email protected].

More details about this seminar series are here -
https://sites.google.com/view/ndgttc/...
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139th Meeting of "New Directions in Group Theory and Triangulated Categories"

Date: March 5, 2026; Thursday

Time: 4 pm UK

Speaker: Marina Purri Brant Godinho (University of Glasgow)

Title: New derived symmetries induced by ring surjections (and crepant contractions).

Abstract: A ring morphism p: A ⟶ B satisfying certain mild assumptions induces a derived endomorphism of A and a derived endomorphism of B, which are closely related. In fact, the derived endomorphism of A is the twist around a certain functor, and the derived endomorphism of B is the corresponding cotwist. In this talk, I will introduce this and discuss "smoothness" and "spherical" criteria under which these endomorphisms are autoequivalences. This technology can be used to construct new derived autoequivalences for very singular varieties.
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