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Study of the splitting-*-homomorphisms by ordered zero completely positive maps and the heredity of invariant properties of C*-algebras

Research Project

Project/Area Number 20K03644
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 12010:Basic analysis-related
Research InstitutionRitsumeikan University

Principal Investigator

大坂 博幸  立命館大学, 理工学部, 教授 (00244286)

Project Period (FY) 2020-04-01 – 2025-03-31
Project Status Granted (Fiscal Year 2023)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2023: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2022: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
KeywordsC*-環 / ロホリン性 / Althuge 変換 / 量子エンタングルメント / ordered zero 完全正値写像 / 作用素単調関数 / C*-algebras / stable rank one / real rank zero / order zero C.P. maps / norm attaining operators / Interpolation functions / symmetric f-divergence / quantum entanglement / *-homomorphisms / approximately inner / symmetrize f-divergence / *-表現の分解 / C*-不変性質
Outline of Research at the Start

本研究の概要は、離散群GからC*-環Aへの作用から生成されるC*-接合積へのAの不変的性質の遺伝性の研究を行い、一般化することである。つまり、与えられたC*-環Aに対して、適当なC*-環Bと*-表現ψ:A→Bを用いて、包含写像ι:A→A_∞を直交性を保全する完全正値写像φ:B→A_∞で局所的近似し、Aのもつ性質を解明し、さらにC*-環の分類問題やフラクタルなどの複雑系に応用することである。

Outline of Annual Research Achievements

令和5年の研究成果は以下のとおりである:1.韓国・蔚山大学のHyun Ho Lee氏と指数が非整数値であるロホリン性を持つC*-包含関係についていくつか例を構成するが群からこない例の構成はできなかった. 群馬大学教授の照屋保氏とinjective II_1 factor フォンノイマン環の包含関係を意識しながらC*-環の非整数値指数を持つ例を構成したが, ロホリン性は期待できないことが予想できた. 2.6月にポーランド・University of Gdanskで開催された国際研究集会で招待講演をし, 7月にはベトナム・Quynhon大学で国際研究集会のオーガナイザーをすると共に講演をオンラインで行う.3.8月に早稲田大学で開催されて国際研究集会ICIM2023で招待講演をおこなう.4.秋学期からNTTのコミュニケーション科学基礎研究所主任研究員の秋笛清石氏と立命館大学の客員研究員である宮崎慈生氏とエンタングルメントの解析を行い, 電子情報通信学会でポスターセッションを行った. 5.8月21日からインド・IIT Hyderabad校からポスドクとしてShanola Smitha Sequeira氏を3か月立命館大学へ招聘し, 東洋大学教授の山崎丈明氏とともに共同研究をする. また, Ramesh Golla氏, Shanola Smitha Sequeira氏とヒルベルト空間上の不変部分空間に関する共同研究を行い論文としてまとめることができた. 現在数学専門誌に投稿中である. 6.11月には京大数理解析研究所の国際研究集会で招待講演をする. 7.2024年3月には日本数学会年会で一般講演を二つ行った.8.数学雑誌にIITHyderabad校のRamesh Golla氏, 東洋大学教授の山崎丈明氏, 鳴門教育大学講師の宇田川陽一氏との共著論文2本が発表された.また, 数学雑誌Annals Funct. Annalにおいて,the 2024-Best Paper AOFA Award WinnerにGolla Ramesh氏との共著論文が選出された.

Current Status of Research Progress
Current Status of Research Progress

2: Research has progressed on the whole more than it was originally planned.

Reason

昨年度国際交流はおおむね問題なくでき、インドからShanola Smitha Sequeira氏をポスドクとして招聘し, 東洋大学教授の山崎丈明氏とのAluthge変換による力学系の研究を遂行することができた. また, 9月にはUniversity of Gdansk教授のMarcin Marciniak氏を招聘し, 量子情報エンタングルメントの探索について集中講義をして頂いたり, 同大学のポスドクであるMichal Banacki氏を招聘し, Tsierlson問題について議論を行い数学サイドからの反例構成について意見交換を行うことができた.
国内出張は群馬大学の照屋保氏とのロホリン性を持つC*-環の包含関係の研究について定期的に遂行することができた。これらを通してC*-環の普遍的性質の遺伝性について少しづつ明らかになってきている。

Strategy for Future Research Activity

海外出張はコロナ禍前の状況に戻ったようで, 5月にパリで開催されるSIAM ILAS2024に参加し招待講演を行い, 6月には昨年度オンラインで参加をしたベトナム・フエ大学において開催されるICMAA2024に対面で参加をする. 9月には, ハンガリー・セゲ大学のLajos Molnar氏からの招待で10日間ほど滞在し作用素平均について議論を行う予定である. 2025年2月にはポーランド・Uniersity of GdanskのMarcin Marciniak氏からの招待を受け, 量子情報理論の量子エンタングルメントの探索について議論を行い, 3月には, アメリカ・トロイ大学のTrung Hoa Dinh氏を訪門し, 量子情報理論におけるf-divergenceについて議論を行う予定である.
国内においては、群馬大学教授の照屋保氏および東洋大学教授の山崎丈明氏と立命館大学東京キャンパスにおいて定期的にセミナーを行う。また、日本数学会の定期総会や
京都大学数理解析研究所の研究会等で講演をする。
さらに、研究を活性化するため、国内外の若手を短期間立命館大学に招聘をする。

Report

(4 results)
  • 2023 Research-status Report
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (43 results)

All 2024 2023 2022 2021 2020 Other

All Int'l Joint Research (12 results) Journal Article (8 results) (of which Int'l Joint Research: 8 results,  Peer Reviewed: 8 results,  Open Access: 8 results) Presentation (19 results) (of which Int'l Joint Research: 10 results,  Invited: 13 results) Book (1 results) Remarks (2 results) Funded Workshop (1 results)

  • [Int'l Joint Research] IIT Hyderabad(インド)

    • Related Report
      2023 Research-status Report
  • [Int'l Joint Research] Gdansk University(ポーランド)

    • Related Report
      2023 Research-status Report
  • [Int'l Joint Research] University of Ulsan(韓国)

    • Related Report
      2023 Research-status Report
  • [Int'l Joint Research] Troy University(米国)

    • Related Report
      2023 Research-status Report
  • [Int'l Joint Research] IIT Hyderabad/IIT Bombay/Narsee Monjee 経営研究所(インド)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] Gdansk University(ポルトガル)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] University of Ulsan(韓国)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] Shanghai University(中国)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] Troy University(米国)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] IIT Hyderaba/IIT Bombay/LNM Institute of Information Technology(インド)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] Gdansk University(ポーランド)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] University of Ulsan(韓国)

    • Related Report
      2021 Research-status Report
  • [Journal Article] Stability of AN-operators under functional calculus2023

    • Author(s)
      G. Ramesh, H. Osaka, Y. Udagawa, T. Yamazaki
    • Journal Title

      Analysis Math.

      Volume: 49 Issue: 3 Pages: 825-839

    • DOI

      10.1007/s10476-023-0231-5

    • Related Report
      2023 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Stability of AN-property for the induced Aluthge transformations2023

    • Author(s)
      G. Ramesh, H. Osaka, Y. Udagawa, T. Yamazaki
    • Journal Title

      Linear Alg. Appl.

      Volume: 678 Pages: 206-226

    • DOI

      10.1016/j.laa.2023.08.016

    • Related Report
      2023 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Interpolation functions and inequalities2022

    • Author(s)
      H. Osaka and Y. Udagawa
    • Journal Title

      Linear and Multilinear Algebras

      Volume: 70 Issue: 20 Pages: 4897-4906

    • DOI

      10.1080/03081087.2021.1901840

    • Related Report
      2022 Research-status Report 2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Rokhlin property for group actions on Hilbert C*-modules2022

    • Author(s)
      Dey, Santanu; Osaka, Hiroyuki; Trivedi, Harsh
    • Journal Title

      Southeast Asian Bulletin of Mathematics

      Volume: 46 Pages: 151-171

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] On operators which attain their norm on every reducing subspace2022

    • Author(s)
      Ramesh, G.; Osaka, H
    • Journal Title

      Ann. Funct. Anal.

      Volume: 13 Issue: 2

    • DOI

      10.1007/s43034-022-00167-8

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] On a subclass of norm attaining operators2021

    • Author(s)
      Ramesh, Golla; Osaka, Hiroyuki
    • Journal Title

      Acta Sci. Math.

      Volume: 87 Issue: 1-2 Pages: 247-263

    • DOI

      10.14232/actasm-020-426-9

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Tracially sequentially-split *-homomorphisms between C*-algebras2021

    • Author(s)
      H. Lee and H. Osaka
    • Journal Title

      Annals Funct. Annal.

      Volume: 12

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] The order-n minors of certain (n+k) x n matrices2020

    • Author(s)
      P. Bag, S. Dey, M. Nagisa and H. Osaka
    • Journal Title

      Linear Algebra and its Applications

      Volume: 603 Pages: 368-389

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] The induced Aluthge sequence of compact operators2024

    • Author(s)
      H. Osaka and T. Yamazaki
    • Organizer
      2024年日本数学会年会
    • Related Report
      2023 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] On charactrization of matrix monotone decreasing functions2024

    • Author(s)
      M. Kian, M. S. Moslehian, and H. Osaka
    • Organizer
      2024年日本数学会年会
    • Related Report
      2023 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Factorization property of positive maps on C*-algebras2023

    • Author(s)
      H. Osaka
    • Organizer
      Mathematical structures in Quantum Mechanics
    • Related Report
      2023 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Factorization property of positive maps on C*-algebras and its applications2023

    • Author(s)
      H. Osaka
    • Organizer
      International workshop on matrix analysis and its applications
    • Related Report
      2023 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] On a class of K-entanglement witnesses2023

    • Author(s)
      H. Osaka
    • Organizer
      ICIAM 2023
    • Related Report
      2023 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Revisit the Powers-Stormer inequality2023

    • Author(s)
      H. Osaka
    • Organizer
      Recent progeress in operator theory and its applications, RIMS
    • Related Report
      2023 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] On a class of k-entanglement witnesses2023

    • Author(s)
      T. Mlynik, H. Osaka, M. Marciniak
    • Organizer
      Mathematical Society of Japan 2023 Annual Meeting, Chuo Univ.
    • Related Report
      2022 Research-status Report
  • [Presentation] A limit of induced Aluthge transformation for centered operators2023

    • Author(s)
      H. Osaka and T. Yamazaki
    • Organizer
      Mathematical Society of Japan 2023 Annual Meeting, Chuo Univ.
    • Related Report
      2022 Research-status Report
  • [Presentation] Factorization property of positive maps on C*-algebras and its applications2022

    • Author(s)
      H. Osaka
    • Organizer
      IISER, Mohali, (online),
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] On a class of k-entanglement witnesses2022

    • Author(s)
      H. Osaka
    • Organizer
      International Workshop on Matrix Analysis and Its Applications, Quy Nhon Univ. Vietnam, (online),
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] On a subclass of norm attaining operators2022

    • Author(s)
      G. Ramesh and H. Osaka
    • Organizer
      Mathematical Society of Japan 2022 Autumn General Meeting, Mathematical Society of Japan, Hokkaido University
    • Related Report
      2022 Research-status Report
  • [Presentation] Stability of AN-property for the induced Aluthge transformations2022

    • Author(s)
      G. Ramesh, H. Osaka, Y. Udagawa, T. Yamazaki
    • Organizer
      Mathematical Society of Japan 2022 Autumn General Meeting,Hokkaido University
    • Related Report
      2022 Research-status Report
  • [Presentation] On subclass of norm attaining operators and related topics2022

    • Author(s)
      H. Osaka
    • Organizer
      作用素論・作用素環論研究集会
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] Factorization property of positive maps on C*-algebras2022

    • Author(s)
      H. Osaka
    • Organizer
      ILAS Special Session on Matrix Analysis and Applications, II
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Stable rank for inclusions of Banach algebras2022

    • Author(s)
      大坂博幸, 渚勝, 富田来成
    • Organizer
      日本数学会
    • Related Report
      2021 Research-status Report
  • [Presentation] Interpolation functions and inequalities2021

    • Author(s)
      H. Osaka
    • Organizer
      First Sibau-Nu workshop on Matrix Analysis and Linear Algebra
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] On a subclass of norm attaining operators2021

    • Author(s)
      H. Osaka
    • Organizer
      Order Analysis and Related Problems of Mathematical Modelling, XVI. Operator Theory and Differential Equations
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Schmidtランクと部分空間2020

    • Author(s)
      渚勝, 大坂博幸, Priyabrata Bag, Santanu Dey
    • Organizer
      日本数学会2020年度秋期総合分科会
    • Related Report
      2020 Research-status Report
  • [Presentation] A factorization property of positive maps on C*-algebras2020

    • Author(s)
      H. Osaka
    • Organizer
      作用素論・作用素環論研究集会
    • Related Report
      2020 Research-status Report
    • Invited
  • [Book] Operator and norm inequalities and related topics2022

    • Author(s)
      Dinh, Trung Hoa; Osaka, Hiroyuki; Tikhonov, Oleg E. /Matrix inequalities and characterizations of operator monotone functions
    • Total Pages
      33
    • Publisher
      Springer
    • ISBN
      9783031021039
    • Related Report
      2022 Research-status Report
  • [Remarks] 国際会議「 Matrix Analysis and Its Applications」

    • URL

      https://math.qnu.edu.vn/vi/maa2022/international-workshop-on-matrix-analysis-and-its-applications?fbclid=IwAR2285DkNJdPjSrOq_i6gEUiX-fthp8zX9AmKsmDhSsELz5XylyjCwcSxMM

    • Related Report
      2022 Research-status Report
  • [Remarks] 2022 日中国際会議

    • URL

      http://www.math.ritsumei.ac.jp/home2/?p=1855

    • Related Report
      2022 Research-status Report
  • [Funded Workshop] 2022 Japan-China International Conference on matrix theory with applications2022

    • Related Report
      2022 Research-status Report

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Published: 2020-04-28   Modified: 2024-12-25  

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