Operator Algebra Seminars

Seminar information archive ~06/27Next seminarFuture seminars 06/28~

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

Seminar information archive

2012/02/02

16:30-18:00   Room #002 (Graduate School of Math. Sci. Bldg.)
Yusuke Isono (Univ. Tokyo)
Weak Exactness for $C^*$-algebras and Application to Condition (AO) (JAPANESE)

2012/01/26

16:30-18:00   Room #117 (Graduate School of Math. Sci. Bldg.)
Catherine Oikonomides (Univ. Tokyo)
The transverse fundamental class of linear foliations
on torus bundles over the circle (ENGLISH)

2012/01/16

16:30-18:00   Room #117 (Graduate School of Math. Sci. Bldg.)
Narutaka Ozawa (RIMS, Kyoto University)
Is an irng singly generated as an ideal? (JAPANESE)

2012/01/06

16:30-18:00   Room #118 (Graduate School of Math. Sci. Bldg.)
Yasuyuki Kawahigashi (Univ. Tokyo)
Diagrammatical methods in theory of subfactors (ENGLISH)

2012/01/05

16:30-18:00   Room #117 (Graduate School of Math. Sci. Bldg.)
Yasuyuki Kawahigashi (Univ. Tokyo)
Classification and amenability in theory of von Neumann algebras (ENGLISH)

2011/12/27

14:30-18:00   Room #117 (Graduate School of Math. Sci. Bldg.)
Makoto Yamashita (Universita di Roma "Tor Vergata") 14:30-16:00
Deformation of algebras associated to group cocycles (JAPANESE)
Yoh Tanimoto (Universitaet Goettingen) 16:30-18:00
Construction of wedge-local nets through
Longo-Witten endomorphisms (JAPANESE)

2011/11/22

16:30-18:00   Room #126 (Graduate School of Math. Sci. Bldg.)

Spyridon Michalakis
( Institute for Quantum Information and Matter (Caltech))
Stability of topological phases of matter (ENGLISH)
[ Abstract ]
The first lecture will be an introduction to quantum mechanics and a proof of Lieb-Robinson bounds for constant range interaction Hamiltonians. The second lecture will build on the first to prove a powerful lemma on the transformation of the interactions of generic gapped Hamiltonians to a new set of rapidly-decaying interactions that commute with the groundstate subspace. I call this "The Energy Filtering Lemma". Then, the third lecture will be on the construction of the Spectral Flow unitary (Quasi-adiabatic evolution) and its properties; in particular, the perfect simulation of the evolution of the groundstate subspace within a gapped path. I will end with a presentation of the recent result on the stability of the spectral gap for frustration-free Hamiltonians, highlighting how the previous three lectures fit into the proof.

2011/11/17

16:30-18:00   Room #117 (Graduate School of Math. Sci. Bldg.)
Takehiko Yamanouchi (Tokyo Gakugei University)
Hecke pairs in ergodic measured equivalence relations (JAPANESE)

2011/10/07

16:30-18:00   Room #122 (Graduate School of Math. Sci. Bldg.)
Takeshi Katsura (Keio University)
Towards the classification of non-simple $C^*$-algebras of real rank zero (ENGLISH)

2011/07/21

16:30-18:00   Room #122 (Graduate School of Math. Sci. Bldg.)
Jean Roydor (Univ. Tokyo)
Almost completely isometric maps and applications (ENGLISH)

2011/07/14

16:30-18:00   Room #122 (Graduate School of Math. Sci. Bldg.)
Raphael Ponge (IPMU)
New perspectives for the local index formula in noncommutative geometry (ENGLISH)

2011/06/16

16:30-18:00   Room #122 (Graduate School of Math. Sci. Bldg.)
Yusuke Isono (Univ. Tokyo)
Introduction to rigidity theory of von Neumann algebras (JAPANESE)

2011/06/09

16:30-18:00   Room #122 (Graduate School of Math. Sci. Bldg.)
Hiroaki Yoshida (Ochanomizu Univ.)
On the free Fisher information distance and the free logarithmic Sobolev inequality (JAPANESE)

2011/04/14

16:30-18:00   Room #122 (Graduate School of Math. Sci. Bldg.)
Masayoshi Matsumura (Univ. Tokyo)
Amenable actions and crossed products of $C^*$-algebras (JAPANESE)

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)

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