Operator Algebra Seminars

Seminar information archive ~10/26Next seminarFuture seminars 10/27~

Date, time & place Wednesday 16:30 - 18:00 122Room #122 (Graduate School of Math. Sci. Bldg.)

Seminar information archive

2011/02/18

10:30-12:00   Room #122 (Graduate School of Math. Sci. Bldg.)
Pedram Hekmati (Univ. Adelaide)
Dirac families and 1-cocycles (ENGLISH)
[ Abstract ]
Families of Dirac type operators, transforming covariantly under the projective action of the loop group $LG$, determine a class in twisted K-theory on compact Lie groups $G$. The loop group is the gauge group of a principal $G$-bundle over the circle and an interesting problem is to try to generalise the circle to a higher dimensional compact manifold. This is far from obvious and some of the difficulties can be modelled in a slightly simpler setting, by replacing $LG$ and gauge connections by objects which have only small differentiability in the Sobolev sense. In this talk, I will provide some background to this problem and explain how 1-cocycles naturally appear in this construction.

2011/02/10

16:30-18:00   Room #122 (Graduate School of Math. Sci. Bldg.)
Alan Weinstein (UC Berkeley)
Symplectic and quantum categories (ENGLISH)

2011/01/28

14:45-16:15   Room #122 (Graduate School of Math. Sci. Bldg.)
Takeshi Katsura (Keio University)
Semiprojectivity of graph algebras (ENGLISH)

2011/01/27

16:30-18:00   Room #122 (Graduate School of Math. Sci. Bldg.)
Hiroshi Takai (Tokyo Metropolitan University)
Entire Cyclic Cohomology of Noncommutative Riemann Surfaces (JAPANESE)

2011/01/20

16:30-18:00   Room #122 (Graduate School of Math. Sci. Bldg.)
Masato Mimura (Univ. Tokyo)
Property (TT)/T and homomorphism rigidity into Out$(F_n)$ (JAPANESE)

2011/01/18

16:30-18:00   Room #118 (Graduate School of Math. Sci. Bldg.)
Claude-Alain Pillet (Univ. de Toulon et du Var)
Scattering induced current in a tight binding band (ENGLISH)

2011/01/13

16:30-18:00   Room #122 (Graduate School of Math. Sci. Bldg.)
Robert Coquereaux (CNRS/CPT)
Global dimensions for fusion categories of type $(G,k)$ (ENGLISH)

2011/01/11

16:30-18:00   Room #122 (Graduate School of Math. Sci. Bldg.)
Raphael Ponge (Univ. Tokyo)
Noncommutative geometry and diffeomorphism-invariant geometries (ENGLISH)

2010/12/16

16:30-18:00   Room #122 (Graduate School of Math. Sci. Bldg.)
Marco Merkli (Memorial Univ. Newfoundland)
Evolution of Quantum Dynamical Systems (ENGLISH)

2010/12/16

15:15-16:15   Room #122 (Graduate School of Math. Sci. Bldg.)
Nicolas Monod (EPFL)
Fixed point theorems and derivations (ENGLISH)

2010/12/09

16:30-18:00   Room #122 (Graduate School of Math. Sci. Bldg.)
Ryszard Nest (Univ. Copenhagen)
Spectral flow associated to KMS states with periodic KMS group action (ENGLISH)

2010/11/30

16:30-18:00   Room #122 (Graduate School of Math. Sci. Bldg.)
Yi-Jun Yao (Fudan Univ.)
Noncommutative geometry and Rankin-Cohen brackets (ENGLISH)

2010/11/25

16:30-18:00   Room #122 (Graduate School of Math. Sci. Bldg.)
Reiji Tomatsu (Tokyo Univ. Science)
Classification of actions of Kac algebras (JAPANESE)

2010/11/18

16:30-18:00   Room #122 (Graduate School of Math. Sci. Bldg.)
Jean Roydor (Univ. Tokyo)
Perturbation of dual operator algebras and similarity (ENGLISH)

2010/11/04

16:30-18:00   Room #122 (Graduate School of Math. Sci. Bldg.)
Yoshiko Ogata (Univ.Tokyo)
Nonequilibrium Statistical Mechanics (JAPANESE)

2010/10/28

16:30-18:00   Room #122 (Graduate School of Math. Sci. Bldg.)
Makoto Yamashita (Univ. Tokyo)
Type III representations of the infinite symmetric group (ENGLISH)
[ Abstract ]
Based on earlier results about the structure of the II$_1$ representations of the infinite symmetric group, we investigate its type III representations and the related inclusion of von Neumann algebras of type III.

2010/10/21

16:30-18:00   Room #122 (Graduate School of Math. Sci. Bldg.)
Benoit Collins (Univ. Ottawa)
Free probability and entropy additivity problems for Quantum information theory (ENGLISH)

2010/10/14

16:30-18:00   Room #122 (Graduate School of Math. Sci. Bldg.)
Yasuyuki Kawahigashi (Univ. Tokyo)
Nonstandard analysis for operator algebraists (JAPANESE)

2010/07/22

16:30-18:00   Room #128 (Graduate School of Math. Sci. Bldg.)
Owen Sizemore (UCLA)
$W^*$ Rigidity for actions of wreath product groups (ENGLISH)
[ Abstract ]
The past 8 years have seen much progress in the classification of
actions of groups on measure spaces. Much of this is due to new powerful
techniques in operator algebras. We will survey some of these results
as well as the new operator algebra techniques. We will then give new
results concerning the classification of actions of wreath product groups.

2010/07/15

16:30-18:00   Room #128 (Graduate School of Math. Sci. Bldg.)
Narutaka Ozawa (Univ. Tokyo)
Type II$_1$ von Neumann representations for Hecke operators on Maass forms (after F. Radulescu) (ENGLISH)

2010/07/08

16:30-18:00   Room #122 (Graduate School of Math. Sci. Bldg.)
Dave Penneys (UC Berkeley)
Killing weeds with annular multiplicities $*10$ via quadratic tangles (ENGLISH)
[ Abstract ]
In recent work with Morrison, Peters, and Snyder, we eliminate two
families of possible principal graphs with graph norms less than 5 using
techniques derived from Jones' work on quadratic tangles.

2010/07/06

16:30-18:00   Room #118 (Graduate School of Math. Sci. Bldg.)
Robert Sims (Univ. Arizona)
On the Existence of the Dynamics for Anharmonic Quantum Oscillator Systems (ENGLISH)

2010/06/24

16:30-18:00   Room #128 (Graduate School of Math. Sci. Bldg.)
Thomas Sinclair (Vanderbilt Univ.)
Strong solidity of factors from lattices in SO(n,1) and SU(n,1) (ENGLISH)
[ Abstract ]
Generalizing techniques found in Ozawa and Popa,
``On a class of II$_1$ factors with at most one Cartan subalgebra, II''
(Amer. J. Math., to appear), we show that the group factors of ICC
lattices in SO(n,1) and SU(n,1), $n\\ge2$, are strongly solid. If
time permits, we will also discuss applications to $L^2$-rigidity.

2010/06/17

16:30-18:00   Room #128 (Graduate School of Math. Sci. Bldg.)
Feng Xu (UC Riverside)
On a relative version of Wall's conjecture (ENGLISH)

2010/06/10

16:30-18:00   Room #128 (Graduate School of Math. Sci. Bldg.)
Mikael Pichot (IPMU)
Random groups and nonarchimedean lattices (JAPANESE)

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