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University of Cambridge > Talks.cam > Isaac Newton Institute Seminar Series > Property (T) and approximate conjugacy of actions

## Property (T) and approximate conjugacy of actionsAdd to your list(s) Download to your calendar using vCal - Andreas Aaserud (Cardiff University)
- Thursday 20 April 2017, 10:00-11:00
- Seminar Room 2, Newton Institute.
If you have a question about this talk, please contact info@newton.ac.uk. NPC - Non-positive curvature group actions and cohomology I will define a notion of approximate conjugacy for probability measure preserving actions and compare it to the a priori stronger classical notion of conjugacy for such actions. In particular, I will spend most of the talk explaining the proof of a theorem stating that two ergodic actions of a fixed group with Kazhdan's property (T) are approximately conjugate if and only if they are actually conjugate. Towards this end, I will discuss some constructions from the theory of von Neumann algebras, including the basic construction of Vaughan Jones and a version of the Feldman-Moore construction. I will also provide some evidence that this theorem may yield a characterization of groups with Kazhdan's property (T). (Joint work with Sorin Popa) This talk is part of the Isaac Newton Institute Seminar Series series. ## This talk is included in these lists:- All CMS events
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