Seminar series
Date
Mon, 01 Jun 2026
13:30
13:30
Location
C1
Speaker
Greg Patchell
Organisation
(Mathematical Institute University of Oxford)
Much recent research has gone into understanding the first order theory of II1 factors. Very recently, Peterson released a preprint which develops deformation rigidity in the ultrapower setting. His techniques give many explicit examples of non-isomorphic ultrapowers for natural families of II1 factors. In this talk, I will introduce some of Peterson's techniques and results, including an analogue of amenability in the ultrapower setting and the interplay between property T and malleable deformations.