談話会・数理科学講演会

過去の記録 ~02/06次回の予定今後の予定 02/07~

担当者 加藤晃史、北山貴裕、辻雄(委員長)、三竹大寿
セミナーURL https://www.ms.u-tokyo.ac.jp/seminar/colloquium/index.html

2008年10月24日(金)

16:30-17:30   数理科学研究科棟(駒場) 002号室
お茶&Coffee&お菓子: 16:00~16:30 (コモンルーム)
Benoit Collins 氏 (オタワ大学・東京大学大学院数理科学研究科)
On the spectral measure of the sum of elements in a finite von Neumann algebra
[ 講演概要 ]
Given two self-adjoint n×n matrices A and B with prescribed eigenvalues, the set of all possible spectral distributions for A+B has been conjectured by Horn and proved by Knutson, Tao, Klyachko and Totaro.
We address the same question when A and B have prescribed spectral measures but lie in an arbitrary II_1 factor, and we give elements of answers in terms of inequalities between the spectral measures. We explain the relation with the Connes embedding problem.