## Operator Algebra Seminars

Seminar information archive ～12/01｜Next seminar｜Future seminars 12/02～

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

### 2010/01/14

16:30-18:00 Room #128 (Graduate School of Math. Sci. Bldg.)

Applications of operator algebras in Quantum information theory

**Marius Junge**(Univ. Illinois, Urbana-Champaign)Applications of operator algebras in Quantum information theory

### 2010/01/07

16:30-18:00 Room #128 (Graduate School of Math. Sci. Bldg.)

Large deviations, Billiards, and Non-equilibrium Statistical Mechanics

**Luc Rey-Bellet**(Univ. Massachusetts)Large deviations, Billiards, and Non-equilibrium Statistical Mechanics

### 2009/12/22

14:40-18:00 Room #128 (Graduate School of Math. Sci. Bldg.)

Symmetric representations of the group of diffeomorphisms of $\\mathbb R$

Topological entropy for actions of sofic groups

**谷本溶**(Univ. Roma ``Tor Vergata'') 14:40-16:10Symmetric representations of the group of diffeomorphisms of $\\mathbb R$

**David Kerr**(Texas A&M Univ.) 16:30-18:00Topological entropy for actions of sofic groups

### 2009/12/17

16:30-18:00 Room #128 (Graduate School of Math. Sci. Bldg.)

Almost commuting unitaries and ${\\mathbb{Z}}^2$-action

**佐藤康彦**(北海道大理)Almost commuting unitaries and ${\\mathbb{Z}}^2$-action

### 2009/12/10

16:30-18:00 Room #128 (Graduate School of Math. Sci. Bldg.)

Symmetric norms and spaces of operators modelled on a semifinite von Neumann algebra

**張欽**(東大数理)Symmetric norms and spaces of operators modelled on a semifinite von Neumann algebra

### 2009/12/03

16:30-18:00 Room #128 (Graduate School of Math. Sci. Bldg.)

Vanishing of quasi-homomorphisms and the stable commutator

lengths on special linear groups over euclidean rings

**見村万佐人**(東大数理)Vanishing of quasi-homomorphisms and the stable commutator

lengths on special linear groups over euclidean rings

### 2009/11/12

16:30-18:00 Room #128 (Graduate School of Math. Sci. Bldg.)

Recent results for amalgamated free products of type II$_1$ factors

**酒匂宏樹**(東大数理)Recent results for amalgamated free products of type II$_1$ factors

### 2009/10/29

16:30-18:00 Room #128 (Graduate School of Math. Sci. Bldg.)

Fusion graphs for Lie groups at level k and quantum symmetries

**Robert Coquereaux**(CNRS/CPT, Marseille)Fusion graphs for Lie groups at level k and quantum symmetries

### 2009/10/22

16:30-18:00 Room #128 (Graduate School of Math. Sci. Bldg.)

On some questions related to Voiculescu's noncommutative topological entropy

**Adam Skalski**(Lancaster University)On some questions related to Voiculescu's noncommutative topological entropy

### 2009/09/07

17:00-18:30 Room #056 (Graduate School of Math. Sci. Bldg.)

Generalized Gaussian field, theta function of Jacobi and functor of second quantization

**Marek Bozejko**(University of Wroclaw)Generalized Gaussian field, theta function of Jacobi and functor of second quantization

### 2009/07/23

16:30-18:00 Room #056 (Graduate School of Math. Sci. Bldg.)

Cyclic cohomology and the Novikov conjecture

**Catherine Oikonomides**(慶応大理工)Cyclic cohomology and the Novikov conjecture

### 2009/07/16

16:30-18:00 Room #056 (Graduate School of Math. Sci. Bldg.)

Algebraic structures in conformal field theory

**Ingo Runkel**(King's College London)Algebraic structures in conformal field theory

[ Abstract ]

It turned out to be fruitful to isolate questions in CFT which can be formulated in a purely categorical fashion. The way left and right moving degrees of freedom can be combined to a consistent theory is an example of this, the relevant structure being a commutative symmetric Frobenius algebra. This is true independently of whether CFT is formulated via sewing of surfaces or nets of operator algebras. Another example is modular invariance, which has a surprising alternative formulation as a certain maximality condition.

It turned out to be fruitful to isolate questions in CFT which can be formulated in a purely categorical fashion. The way left and right moving degrees of freedom can be combined to a consistent theory is an example of this, the relevant structure being a commutative symmetric Frobenius algebra. This is true independently of whether CFT is formulated via sewing of surfaces or nets of operator algebras. Another example is modular invariance, which has a surprising alternative formulation as a certain maximality condition.

### 2009/07/09

16:30-18:00 Room #056 (Graduate School of Math. Sci. Bldg.)

Examples of groups of intermediate rank

**Mikael Pichot**(東大数物連携宇宙研究機構)Examples of groups of intermediate rank

### 2009/07/02

17:00-18:00 Room #056 (Graduate School of Math. Sci. Bldg.)

Dixmier's Similarity Problem ---Littlewood and Forests--- (一般の数学者向け)

**小沢登高**(東大数理)Dixmier's Similarity Problem ---Littlewood and Forests--- (一般の数学者向け)

### 2009/06/25

16:30-18:00 Room #056 (Graduate School of Math. Sci. Bldg.)

Infrared divergence of scalar quantum field model on pseudo Riemann manifold

**鈴木章斗**(九州大学数理学研究院)Infrared divergence of scalar quantum field model on pseudo Riemann manifold

### 2009/06/18

16:30-18:00 Room #056 (Graduate School of Math. Sci. Bldg.)

The super Virasoro algebra and noncommutative geometry

**河東泰之**(東大数理)The super Virasoro algebra and noncommutative geometry

### 2009/06/11

16:30-18:00 Room #056 (Graduate School of Math. Sci. Bldg.)

A topos for algebraic quantum theory

**Chris Heunen**(Radboud Universiteit Nijmegen)A topos for algebraic quantum theory

### 2009/06/04

16:30-18:00 Room #056 (Graduate School of Math. Sci. Bldg.)

Determinant for rectangular martices

**中神祥臣**(日本女子大)Determinant for rectangular martices

### 2009/05/28

16:30-18:00 Room #056 (Graduate School of Math. Sci. Bldg.)

The Rohlin property for automorphisms of the Jiang-Su algebra

**佐藤康彦**(北大理)The Rohlin property for automorphisms of the Jiang-Su algebra

### 2009/05/14

16:30-18:00 Room #056 (Graduate School of Math. Sci. Bldg.)

Noncommutative geometry and lower dimensional volumes in Riemannian and CR geometry

**Raphael Ponge**(東大数理)Noncommutative geometry and lower dimensional volumes in Riemannian and CR geometry

### 2009/05/07

16:30-18:00 Room #056 (Graduate School of Math. Sci. Bldg.)

A fixed point property and the Kazhdan property of

$SL(n, \\mathbb{Z} [X_1, \\ldots , X_k])$ for Banach spaces

**見村万佐人**(東大数理)A fixed point property and the Kazhdan property of

$SL(n, \\mathbb{Z} [X_1, \\ldots , X_k])$ for Banach spaces

### 2009/04/30

16:30-18:00 Room #056 (Graduate School of Math. Sci. Bldg.)

Measure Equivalence Rigidity and Bi-exactness of Groups

**酒匂宏樹**(東大数理)Measure Equivalence Rigidity and Bi-exactness of Groups

### 2009/04/23

16:30-18:00 Room #128 (Graduate School of Math. Sci. Bldg.)

Entire Cyclic Cohomology of Noncommutative 2-Tori

**内藤克利**(首都大)Entire Cyclic Cohomology of Noncommutative 2-Tori

### 2009/04/16

16:30-18:00 Room #128 (Graduate School of Math. Sci. Bldg.)

Large Deviations in Quantum Spin Chains

**緒方芳子**(東大数理)Large Deviations in Quantum Spin Chains

### 2009/04/09

16:30-18:00 Room #128 (Graduate School of Math. Sci. Bldg.)

Bimodules, planarity and freeness

**Dietmar Bisch**(Vanderbilt University)Bimodules, planarity and freeness