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2011 Fiscal Year Annual Research Report

極小表現の大域解析と無限次元表現の分岐則

Research Project

Project/Area Number 22340026
Research InstitutionThe University of Tokyo

Principal Investigator

小林 俊行  東京大学, 大学院・数理科学研究科, 教授 (80201490)

Keywordsユニタリ表現 / リー群 / 極小表現 / 無重複表現 / 幾何的量子化 / 分岐則 / 可視的作用 / フーリエ変換
Research Abstract

単純リー群の極小表現はごく少数の"根源的な"ユニタリ表現である。本年度は不定値直交群の極小表現のシュレディンガーモデルにおける群作用の鍵となるユニタリ反転変換の明示形を与え、その性質を詳細に研究した。別の観点から言えば、この理論は、Weil表現のユニタリ反転変換がフーリエ変換になるという古典的な結果を拡張して、二次錐上にフーリエ変換に相当する内在的な作用素が唯一つあることを発見し、その基礎理論を構築したものである(著書[1])。さらに,古典的なフーリエ変換と新しく発見したユニタリ反転作用素を連続的に結ぶ変形理論を展開した(第2論文)。一方、極小表現から自然に生じる4階の微分方程式に付随する特殊関数や直交多項式を発見し、その基礎となる理論を進展させた(第5,6,10論文)。また、極小表現を非コンパクトな設定での幾何的量子化の立場から(第9論文)、代数解析との接点から(第7論文)論じた。
一方、ユニタリ表現の分岐則を調べることは、表現の理論の最も主要な問題の一つであり、新しい表現の構成や分析に強力な手法を与えるのみならず、保型形式の整数論や非可換調和解析の研究にも深く関わっている。Zuckerman教授60歳記念号で導来函手加群の分岐則の理論を著し(第4論文)、第1論文は一般バーマ加群の離散的分岐則の理論を旗多様体の幾何を用いて展開し、第3論文では複素多様体の可視的作用の理論を用いて無重複表現の伝播定理を証明した。

Current Status of Research Progress
Current Status of Research Progress

1: Research has progressed more than it was originally planned.

Reason

当初の研究目的を達成する過程において,"極小表現の大域解析"の副産物として一般化されたVerma加群の離散分岐則の理論(第1論文)や,第2論文のユニタリ反転作用素の変形理論としてLaguerre半群とDunkl operatorの理論を進展させることができた。これらは,交付申請書を執筆した時点では予期できなかった新しい発見に基づく理論の進展である。

Strategy for Future Research Activity

当初の計画以上に研究が進展しており、新しいアイディアも生まれたことを活かすべく、論文の執筆を加速するとともに、共同研究者との接触も多くして、理論のさらなる進展を図りたい。
特に、無限次元表現の分岐則の理論の推進に関しては中長期的な視野に立った基礎研究を進め、極小表現の大域解析に関しては、昨年までの研究で成功した「不定値直交群の極小表現に対するシュレーディンガーモデルの理論」のアイディアをさらに発展させ、Jordan代数の共形変換群というさらに一般化された設定での単純リー群の極小表現に付随する大域解析の研究を加速させる。

  • Research Products

    (27 results)

All 2012 2011 Other

All Journal Article (10 results) (of which Peer Reviewed: 8 results) Presentation (15 results) Book (1 results) Remarks (1 results)

  • [Journal Article] Restrictions of generalized Verma modules to symmetric pairs2012

    • Author(s)
      Toshiyuki Kobayashi
    • Journal Title

      Transformation Groups

      Volume: (to appear) Pages: 31

    • DOI

      10.1007.S00031-012-y

    • Peer Reviewed
  • [Journal Article] Propagation of multiplicity-freeness property for holomorphic vector bundles2012

    • Author(s)
      Toshiyuki Kobayashi
    • Journal Title

      Progress in Mathematics, Birkhauser

      Volume: (to appear) Pages: 32

    • Peer Reviewed
  • [Journal Article] Branching problems of Zuckerman derived functor modules2011

    • Author(s)
      Toshiyuki Kobayashi
    • Journal Title

      Contemporary Mathematics, American Mathematical Society

      Volume: 557 Pages: 23-40

    • Peer Reviewed
  • [Journal Article] Orthogonal polynomials associated to a certain fourth order differential equation2011

    • Author(s)
      J.Hilgert, Toshiyuki Kobayashi, G.Mano, J.Mollers
    • Journal Title

      Ramanujan J.Math.

      Volume: 26 Pages: 295-310

    • DOI

      10.1007/s11139-011-9338-6

    • Peer Reviewed
  • [Journal Article] Special functions associated to a certain fourth order differential equation2011

    • Author(s)
      J.Hilgert, Toshiyuki Kobayashi, G.Mano, J.Mollers
    • Journal Title

      Ramanujan J.Math.

      Volume: 26 Pages: 1-34

    • DOI

      10.1007/s11139-011-9315-0

    • Peer Reviewed
  • [Journal Article] Algebraic analysis of minimal representations2011

    • Author(s)
      Toshiyuki Kobayashi
    • Journal Title

      Publ.RIMS (Publications of the Research Institute for Mathematical Sciences)

      Volume: 47 Pages: 585-611

    • DOI

      10.2977/PRIMS/45

    • Peer Reviewed
  • [Journal Article] Geometric analysis on minimal representations2011

    • Author(s)
      Toshiyuki Kobayashi
    • Journal Title

      Ninth Oka Symposium Lecture Notes

      Pages: 27-61

  • [Journal Article] Geometric quantization, limits, and restrictions…some examples for elliptic and nilpotent orbits2011

    • Author(s)
      Toshiyuki Kobayashi
    • Journal Title

      Mathematisches Forschungsinstitut Oberwolfach

      Volume: 09 Pages: 466-469

    • DOI

      DOI:10.4171/OWR/2011/09

  • [Journal Article] An integral formula for L^2-eigen functions of a fourth order Bessel type differential operator2011

    • Author(s)
      Toshiyuki Kobayashi, J.Mollers
    • Journal Title

      Integral Transforms and Special Functions

      Volume: 22 Pages: 521-531

    • DOI

      10.1080/10652469.2010.533270

    • Peer Reviewed
  • [Journal Article] Laguerre semigroup and Dunkl operators

    • Author(s)
      S.Ben Said, T.Kobayashi, B.Orsted
    • Journal Title

      Compositio Mathematica

      Volume: 75(to appear)(掲載確定)

    • Peer Reviewed
  • [Presentation] Stable Spectrum for non-Riemannian Locally Symmetric Spaces2012

    • Author(s)
      Toshiyuki Kobayashi
    • Organizer
      Lie Groups : Structure, Actions and Representations (In honor of Prof.Joseph Wolf for his 75 th birthday)
    • Place of Presentation
      Ruhr-Universitat, Bochum(ドイツ)(招待講演)
    • Year and Date
      20120111-20120114
  • [Presentation] Confromally Equivariant Differential Operators and Branching Problems of Verma Modules2012

    • Author(s)
      Toshiyuki Kobayashi
    • Organizer
      Workshop on Geometric Analysis on Euclidean and Homogeneous Spaces (in honor of Sigurdur Helgason's 85 th birthday)
    • Place of Presentation
      Tufts University(アメリカ)(招待講演)
    • Year and Date
      20120108-20120109
  • [Presentation] Finite Multiplicity Theorems and Real Spherical Varieties2012

    • Author(s)
      Toshiyuki Kobayashi
    • Organizer
      Branching Laws
    • Place of Presentation
      NUS(シンガポール)(招待講演)
    • Year and Date
      2012-03-19
  • [Presentation] Discrete Spectrum for Non-Riemannian Locally Symmetric Spaces2011

    • Author(s)
      Toshiyuki Kobayashi
    • Organizer
      Cohomology of Arithmetic Groups (on the occasion of Prof.MS Raghunathan turning 70 during the year)
    • Place of Presentation
      Tata Institute of Fundamental Research(Mumbai,インド)(招待講演)
    • Year and Date
      20111228-20111231
  • [Presentation] Finite Multiplicity Theorems2011

    • Author(s)
      Toshiyuki Kobayashi
    • Organizer
      Lie Groups, Lie Algebras and their Representations
    • Place of Presentation
      University of California(アメリカ)(closing lecture)(招待講演)
    • Year and Date
      20111105-20111106
  • [Presentation] Analysis on pseudo-Riemannian locally symmetric spaces2011

    • Author(s)
      Toshiyuki Kobayashi
    • Organizer
      Chern Centennial Conference
    • Place of Presentation
      MSRI at Berkeley, California(アメリカ)(招待講演)
    • Year and Date
      20111030-20111105
  • [Presentation] Restrictions of Verma Modules to Symmetric Pairs and Some Applications to Differential Geometry2011

    • Author(s)
      Toshiyuki Kobayashi
    • Organizer
      Representation Theory XII
    • Place of Presentation
      Dubrovnik(クロアティア)(2 lectures)(招待講演)
    • Year and Date
      20110622-20110623
  • [Presentation] On Real Spherical Homogeneous Spaces2011

    • Author(s)
      Toshiyuki Kobayashi
    • Organizer
      Analysis on Lie groups
    • Place of Presentation
      Max Planck Institute for Mathematics, Bonn(ドイツ)(招待講演)
    • Year and Date
      2011-09-27
  • [Presentation] Analysis Minimal Representations2011

    • Author(s)
      Toshiyuki Kobayashi
    • Organizer
      Harmonic Analysis, Deformation Quantization, Noncommutative Geometry
    • Place of Presentation
      Scalea(イタリア)(招待講演)
    • Year and Date
      2011-09-08
  • [Presentation] Conformally Equivariant Differential Operators and Branching Problems of Verma Modules2011

    • Author(s)
      Toshiyuki Kobayashi
    • Organizer
      Lie Groups : Geometry and Analysis (JSPS/DFG seminar)
    • Place of Presentation
      Paderborn(ドイツ)(招待講演)
    • Year and Date
      2011-09-05
  • [Presentation] Branching Problems for unitary representations-analytic aspects2011

    • Author(s)
      Toshiyuki Kobayashi
    • Organizer
      AIM Conference : Branching Problems for Unitary Representations
    • Place of Presentation
      Max Planck Institute for Mathematics, Bonn(ドイツ)(招待講演)
    • Year and Date
      2011-07-25
  • [Presentation] Branching problems for unitary representations-algebraic aspects2011

    • Author(s)
      Toshiyuki Kobayashi
    • Organizer
      AIM Conference : Branching Problems for Unitary Representations
    • Place of Presentation
      Max Planck Institute for Mathematics, Bonn(ドイツ)(招待講演)
    • Year and Date
      2011-07-25
  • [Presentation] Multiplicities of Irreducible Representations2011

    • Author(s)
      Toshiyuki Kobayashi
    • Organizer
      Seminar Sophus Lie
    • Place of Presentation
      Erlangen(ドイツ)(closing lecture)(招待講演)
    • Year and Date
      2011-07-16
  • [Presentation] Analysis on Minimal Representations2011

    • Author(s)
      Toshiyuki Kobayashi
    • Organizer
      IX. International Workshop : Lie Theory and its Applications in Physics
    • Place of Presentation
      Varna(ブルガリア)(招待講演)
    • Year and Date
      2011-06-25
  • [Presentation] Restrictions of Verma Modules to Symmetric Pairs and Some Applications to Differential Geometry2011

    • Author(s)
      Toshiyuki Kobayashi
    • Organizer
      Special day on Lie groups
    • Place of Presentation
      Utrecht大学(オランダ)(招待講演)
    • Year and Date
      2011-05-17
  • [Book] The Schrodinger model for the Minimal representation of the indefinite orthogonal group O(p,q)2011

    • Author(s)
      T.Kobayashi, G.Mano
    • Total Pages
      132
    • Publisher
      アメリカ数学会(Memoirs of American Mathematical Society)
  • [Remarks]

    • URL

      www.ms.u-tokyo.ac.jp/~toshi

URL: 

Published: 2013-06-26  

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