Property (T) and approximate conjugacy of actions
58 mins 39 secs,
107.28 MB,
MP3
44100 Hz,
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Description: |
Aaserud, A (Cardiff University)
Thursday 20th April 2017 - 10:00 to 11:00 |
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Created: | 2017-04-28 11:00 |
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Collection: | Non-Positive Curvature Group Actions and Cohomology |
Publisher: | Isaac Newton Institute |
Copyright: | Aaserud, A |
Language: | eng (English) |
Distribution: | World (downloadable) |
Explicit content: | No |
Aspect Ratio: | 16:9 |
Screencast: | No |
Bumper: | UCS Default |
Trailer: | UCS Default |
Abstract: | 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) |
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MPEG-4 Video | 640x360 | 1.91 Mbits/sec | 843.35 MB | View | Download | |
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MP3 * | 44100 Hz | 249.73 kbits/sec | 107.28 MB | Listen | Download | |
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