Sep. 0811 
Sci 3110 
Group Actions and Metric Embeddings


Oct. 0507 
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, ShalomTao in 2009, and BreuillardGreenTao in 2011. In this talk, I will give yet another proof of Gromov's theorem, along the lines of Shalom and ChifanSinclair, which is based on the analysis of reduced cohomology and Shalom's property $H_{\mathrm{FD}}$.


Oct. 2426 
MyoKo 
Annual meeting on operator theory & operator algebra theory


Nov. 0911 
RIMS 420 
Research on structure of operators by order and geometry with related topics


Nov. 10 DT Seminar 
15:00  16:30 Sci 6609 
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 LeePeres, for nondegenerate random walks on infinite groups, the speed is between $\sqrt{n}$ and $n$. By AmirVirag, 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. 08 DT Seminar 
15:00  16:30 Sci 6609 
Narutaka Ozawa (RIMS)
A functional analysis proof of Gromov's polynomial growth theorem
Rebroadcasting.


Dec. 1213 
Kinosaki 
Kansai Operator Algebra Seminar


Jan. 12 
15:00  16:30 RIMS 206 
Gábor Szabó (Münster)
Strongly selfabsorbing C*dynamical systems
We discuss a generalization of the notion of strongly selfabsorbing C*algebras to the setting of C*dynamical systems. The main result is an equivariant McDufftype theorem that characterizes exactly when an action of a locally compact group on a separable C*algebra absorbs a given strongly selfabsorbing action tensorially up to cocycle conjugacy. This extends a similar folklore result that has been known for discrete group actions. I will present natural examples of strongly selfabsorbing actions, and we then discuss what kind of (equivariant) permanence properties carry over in this context, similar to how Dstability is closed under various C*algebraic operations.


Jan. 2527 
RIMS 111 
Some problems in operator algebras related to ergodic theory and group theory


Feb. 23 
15:00  16:30 RIMS 206 
James Mingo (Queen's University, Kingston)
Cumulants of Partially Transposed Random Matrices
In quantum information theory the partial transpose of a positive matrix has been used to detect entanglement. I have recently investigated the effect of partial transposes on asymptotic freeness. The main tool for doing this is the use of free cumulants, both of first and second order. I will show how to use some simple geometric properties to find these cumulants.

