TOMATSU, Reiji
 Position
 Associate Professor
 Organization
 Department of Mathematics
 Research Activities

I am mainly studying von Neumann algebras and (quantum) group actions on them. My recent interest has been focused on the classification of Rohlin flows on injective factors and the characterization of the Rohlin property for flows.
Papers:1. T. Masuda and R. Tomatsu,
Classification of minimal actions of a compact Kac algebra with amenable dual,
Comm. Math. Phys. 274 (2007), no. 2, 487551.2. R. Tomatsu,
A characterization of right coideals of quotient type and its application to classification of Poisson boundaries,
Comm. Math. Phys. 275 (2007), no. 1, 271296.3. R. Tomatsu,
A Galois correspondence for compact quantum group actions,
J. Reine Anguew. Math. 633 (2009), 165182.4. T. Masuda and R. Tomatsu,
Approximate innerness and central triviality of endomorphisms,
Adv. Math. 220 (2009), no. 4, 10751134.  Keywords
 C*algebra, quantum group, von Neumann algebra
 WebPage
 http://www.math.sci.hokudai.ac.jp/~tomatsu/eindex.html