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DTSTART:19700329T010000
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CATEGORIES:Isaac Newton Institute Seminar Series
SUMMARY:Property (T) and approximate conjugacy of actions
- Andreas Aaserud (Cardiff University)
DTSTART;TZID=Europe/London:20170420T100000
DTEND;TZID=Europe/London:20170420T110000
UID:TALK72100AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/72100
DESCRIPTION:I will define a notion of approximate conjugacy fo
r probability measure preserving actions and compa
re it to the a priori stronger classical notion of
conjugacy for such actions. In particular\, I wil
l spend most of the talk explaining the proof of a
theorem stating that two ergodic actions of a fix
ed group with Kazhdan'\;s property (T) are appr
oximately conjugate if and only if they are actual
ly conjugate. Towards this end\, I will discuss so
me constructions from the theory of von Neumann al
gebras\, including the basic construction of Vaugh
an Jones and a version of the Feldman-Moore constr
uction. I will also provide some evidence that thi
s theorem may yield a characterization of groups w
ith Kazhdan'\;s property (T).  \; (Joint
work with Sorin Popa)
LOCATION:Seminar Room 2\, Newton Institute
CONTACT:INI IT
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