Kyoto Operator Algebra Seminar

Organizers: Benoit COLLINS, Masaki IZUMI, Narutaka OZAWA.
Time and Location: 15:00 - 16:30 on Tuesday at RIMS 206
Seminar Description: This seminar features both research and introductory talks on topics in Operator Algebra, Noncommutative Geometry, Ergodic Theory, and Group Theory of various kinds (geometric, measure theoretic, functional analytic, etc.). The talks are informal and take between an hour and an hour and a half.
Useful Tips: How to Give a Good Colloquium. Advice on Giving Talks (Upgrade). Myths.
Memento: 2011  2012  2013  2014  2015 Spring/Summer

2015 Fall/Winter

 Sep. 08-11 Sci 3-110 Group Actions and Metric Embeddings Oct. 05-07 RIMS 111 Quantum fields and related topics Oct. 06 15:00 - 16:30 RIMS 206 Noriyoshi Sakuma (Aichi Kyoiku) Unimodality for free Lévy processes I will talk about recent developments of research of free infinitely divisible distributions based on joint work with T. Hasebe. Especially, some interesting distributional properties are founded comparing the classical probability. Oct. 20 15:00 - 16:30 RIMS 206 Narutaka Ozawa (RIMS) A functional analysis proof of Gromov's polynomial growth theorem The celebrated theorem of Gromov in 1980 asserts that any finitely generated group with polynomial growth contains a nilpotent subgroup of finite index. Alternative proofs have been given by Kleiner in 2007, Shalom--Tao in 2009, and Breuillard--Green--Tao in 2011. In this talk, I will give yet another proof of Gromov's theorem, along the lines of Shalom and Chifan--Sinclair, which is based on the analysis of reduced cohomology and Shalom's property $H_{\mathrm{FD}}$. Oct. 24-26 Myo-Ko Annual meeting on operator theory & operator algebra theory Nov. 09-11 RIMS 420 Research on structure of operators by order and geometry with related topics Nov. 10DT Seminar 15:00 - 16:30 Sci 6-609 Jeremie Brieussel (Montpellier) About the speed of random walk on solvable groups The speed of a random walk measures the average distance between the particle and its starting point. By Lee--Peres, for non-degenerate random walks on infinite groups, the speed is between $\sqrt{n}$ and $n$. By Amir--Virag, any regular function between $n^{3/4}$ and $n$ is the speed function of some random walk on some group. I will describe some solvable groups and some random walks on them with speed between $\sqrt{n}$ and $n^{3/4}$. Dec. 01 15:00 - 16:30 RIMS 206 Narutaka Ozawa (RIMS) Character Rigidity after Jesse Peterson Dec. 08DT Seminar 15:00 - 16:30 Sci 6-609 Narutaka Ozawa (RIMS) A functional analysis proof of Gromov's polynomial growth theorem Re-broadcasting. Dec. 12-13 Kinosaki Kansai Operator Algebra Seminar Dec. 22 15:00 - 16:30 RIMS 206 TBA (tba) TBA Jan. 12 15:00 - 16:30 RIMS 206 Gábor Szabó (Münster) TBA Jan. 25-27 RIMS 111 Some problems in operator algebras related to ergodic theory and group theory

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