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Moment maps in representation theory and noncommutative invariant theory

Research Project

Project/Area Number 26400014
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Algebra
Research InstitutionTottori University

Principal Investigator

HASHIMOTO Takashi  鳥取大学, 教育支援・国際交流推進機構, 教授 (90263491)

Project Period (FY) 2014-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2018: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2017: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2015: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2014: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Keywords運動量写像 / 不定値直交群 / 極小表現 / Howe双対性 / Gelfand-Kirillov次元 / Bernstein次数 / ユニタリ性 / 零化イデアル / 退化主系列表現への埋込み / シンプレクティックベクトル空間 / sl(2)の既約有限次元表現 / 非コンパクト局所好一対 / 正準量子化 / ベッセル関数 / oscillator表現 / 随伴多様体
Outline of Final Research Achievements

The indefinite orthogonal group O(p,q) naturally acts on a symplectic vector space, with a moment map. We construct a (g,K)-modules of O(p,q) by quantizing the moment map, and apply the Howe duality to obtain irreducible modules that correspond to the finite-dimensional representations of sl(2), as well as their K-type formulas. We obtain Gelfand-Kirillov dimension and Bernstein degree of the modules, which are the representation-theoretic invariants, from the K-type formula. We find that the Gelfand-Kirillv dimension of our modules are all equal to the one of the minimal representation of O(p,q), which corresponds to the trivial representation of sl(2), and that Bernstein degree distinguishes the minimal representation from the others.

Academic Significance and Societal Importance of the Research Achievements

運動量写像は不変式論等,代数幾何学において非常に重要な役割を果たしていることは周知の事実であるが,本研究により,運動量写像が非可換な世界と可換な世界とをつなぐ架け橋の役割を担っていることが明らかとなり,運動量写像が表現論においてもまた,重要な役割を果たしていることが強調できた.系のもつ対称性が運動量写像により記述されるという点において,運動量写像は Lie 理論的に極めて自然で,かつ,座標系を用いて具体的に表せることが,運動量写像が数学における様々な場面において,このように重要な役割を果たすのだと思われる.

Report

(7 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • 2016 Research-status Report
  • 2015 Research-status Report
  • 2014 Research-status Report
  • Research Products

    (12 results)

All 2019 2018 2017 2016 2015 2014

All Journal Article (4 results) (of which Peer Reviewed: 2 results,  Open Access: 1 results) Presentation (8 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] sl_2 の有限次元表現に付随するO(p,q)の(g,K)加群2019

    • Author(s)
      橋本隆司
    • Journal Title

      京都大学数理解析研究所講究録

      Volume: 2103 Pages: 1-13

    • Related Report
      2018 Research-status Report
  • [Journal Article] The moment map on symplectic vector space and oscillator representation2017

    • Author(s)
      Takashi Hashimoto
    • Journal Title

      Kyoto Journal of Mathematics

      Volume: 57 Issue: 3 Pages: 553-583

    • DOI

      10.1215/21562261-2017-0006

    • Related Report
      2017 Research-status Report 2015 Research-status Report
    • Peer Reviewed
  • [Journal Article] A twisted moment map and its equivariance2014

    • Author(s)
      Takashi Hashimoto
    • Journal Title

      Tohoku Mathematical Journal

      Volume: 66 Pages: 563-581

    • NAID

      110009555477

    • Related Report
      2014 Research-status Report
    • Peer Reviewed
  • [Journal Article] Quantization of the moment map on symplectic vector space and the oscillator representation2014

    • Author(s)
      橋本隆司
    • Journal Title

      数理解析研究所講究録

      Volume: 1925 Pages: 103-116

    • Related Report
      2014 Research-status Report
    • Open Access
  • [Presentation] (g,K)-module of O(p,q) associated with the finite-dimensional representation of sl_22019

    • Author(s)
      Takashi Hashimoto
    • Organizer
      1147th AMS Meeting, American Mathematical Society
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] sl_2 の有限次元表現に付随するO(p,q)の(g,K)加群2018

    • Author(s)
      橋本隆司
    • Organizer
      RIMS共同研究(公開型)"表現論と代数,解析,幾何をめぐる諸問題"
    • Related Report
      2018 Research-status Report
  • [Presentation] sl_2の有限次元表現に付随する不定値直交群の(g,K)-加群2 --Gelfand-Kirillov次元とBernstein次数--2018

    • Author(s)
      橋本隆司
    • Organizer
      2017年度表現論ワークショップ
    • Related Report
      2017 Research-status Report
  • [Presentation] sl_2の有限次元表現に付随する不定値直交群の(g,K)-加群2017

    • Author(s)
      橋本隆司
    • Organizer
      2016年度表現論ワークショップ
    • Place of Presentation
      鳥取県立ふれあい会館(鳥取県鳥取市)
    • Year and Date
      2017-01-07
    • Related Report
      2016 Research-status Report
  • [Presentation] 不定値直交群の極小表現を目指して(その2)2016

    • Author(s)
      橋本隆司
    • Organizer
      2015年度表現論ワークショップ
    • Place of Presentation
      鳥取県立ふれあい会館
    • Year and Date
      2016-01-10
    • Related Report
      2015 Research-status Report
  • [Presentation] 不定値直交群の極小表現を目指して2015

    • Author(s)
      橋本隆司
    • Organizer
      不変性と双対性
    • Place of Presentation
      鹿児島大学理学部
    • Year and Date
      2015-09-08
    • Related Report
      2015 Research-status Report
  • [Presentation] Quantization of the moment map on symplectic vector space and the oscillator representation2014

    • Author(s)
      Takashi Hashimoto
    • Organizer
      International Congress of Mathematicians
    • Place of Presentation
      COEX, Seoul, Korea
    • Year and Date
      2014-08-16
    • Related Report
      2014 Research-status Report
  • [Presentation] Quantization of the moment map on symplectic vector space and the oscillator representation2014

    • Author(s)
      橋本隆司
    • Organizer
      RIMS研究集会"表現論と調和解析の新たな進展"
    • Place of Presentation
      京都大学数理解析研究所
    • Year and Date
      2014-06-26
    • Related Report
      2014 Research-status Report

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Published: 2014-04-04   Modified: 2021-02-19  

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