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2015 Fiscal Year Annual Research Report

無限群と幾何学の新展開

Research Project

Project/Area Number 24224002
Research InstitutionThe University of Tokyo

Principal Investigator

坪井 俊  東京大学, 数理(科)学研究科(研究院), 教授 (40114566)

Co-Investigator(Kenkyū-buntansha) 小島 定吉  東京工業大学, 情報理工学(系)研究科, 教授 (90117705)
大鹿 健一  大阪大学, 理学(系)研究科(研究院), 教授 (70183225)
小林 俊行  東京大学, 数理(科)学研究科(研究院), 教授 (80201490)
藤原 耕二  京都大学, 理学(系)研究科(研究院), 教授 (60229078)
河澄 響矢  東京大学, 数理(科)学研究科(研究院), 准教授 (30214646)
足助 太郎  東京大学, 数理(科)学研究科(研究院), 准教授 (30294515)
大島 利雄  城西大学, 理学部, 教授 (50011721)
Project Period (FY) 2012-05-31 – 2017-03-31
Keywords無限群 / 幾何学 / 空間形 / 多様体 / 微分同相群 / 力学系 / 写像類群 / 野性的空間
Outline of Annual Research Achievements

無限群と幾何学についての広範な研究をおこなった。研究体制を強化するために、分担者に大島利雄を加えた。こうして、[空間形と無限群]について小島、大鹿、小林、大島、金井、森吉、松田のグループで、[多様体の微分同相群]については坪井、小林、足助、大島、松元、森田、森吉、高村のグループで、[曲面の写像類群]については、大鹿、藤原、河澄、足助、森田、皆川のグループで、[無限群の力学系的不変量]については、坪井、松元、金井、中山、林、野田、皆川、浅岡、児玉のグループで、[無限群と野生的空間]については、小島、大鹿、藤原、河澄、中山、林、浅岡のグループで共同研究を継続した。研究支援員を7名雇用し、研究を推進した。
7月に小研究集会「無限群と幾何学の周辺」、7月に「幾何学とインターネットの数理2015」研究集会、10月に「葉層構造と微分同相群2015研究集会」を開催し、連携研究者と共同研究をおこなうとともに、研究情報の交流に努めた。11月に、研究集会「トポロジーとコンピュータ 2015」、12月に研究集会 「リーマン面の幾何の展開」および「複素解析的ベクトル場・葉層構造とその周辺」研究集会を共催した。11月にYakov Eliashberg氏を招聘し、シンプレクティク幾何学について6回の講演をしてもらった。2月のBerkeley-Tokyo Winter Schoolに若手研究者を派遣した。
研究代表者坪井俊は、実解析的微分同相群の研究の現状を整理した。大鹿健一は作間誠との共同研究の論文を出版した。小林俊行は擬リーマン空間形でのスペクトル理論極小表現についての論文を出版した。藤原耕二は写像類群についての結果、Calegariと共同研究の結果の論文を出版した。河澄響矢は久野雄介との結果を出版した。足助太郎は2次特性類の微分についての2編の論文を出版した。

Current Status of Research Progress
Current Status of Research Progress

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

Reason

5つのグループによる共同研究は、うまく進行しており、分担者に研究成果が現れている。、擬アノソフ写像、クライン群の変形空間、極小表現、写像類群、複素葉層構造についての研究成果などが出版されるようになった。研究体制を強化するために、分担者に大島利雄を加えたことも効果を上げている。新しい研究手法も見つかっているので、今後に期待できる.

Strategy for Future Research Activity

5つのグループの共同研究を全体としてまとめていく研究方法を継続すれば, さらに研究成果が見込まれる. 無限群と幾何学の合流する点での問題ととらえることを続けていくことが重要と考える。研究分担者, 連携研究者との共同研究をさらに緊密にし、さらに広い視点を取り込んで研究を継続する予定である.

  • Research Products

    (52 results)

All 2016 2015

All Journal Article (17 results) (of which Int'l Joint Research: 10 results,  Peer Reviewed: 17 results,  Acknowledgement Compliant: 2 results,  Open Access: 4 results) Presentation (33 results) (of which Int'l Joint Research: 28 results,  Invited: 33 results) Book (2 results)

  • [Journal Article] Subgroups of mapping class groups related to Heegaard splittings and bridge decompositions2016

    • Author(s)
      Ken’ichi Ohshika, Makoto Sakuma
    • Journal Title

      Geometriae Dedicata

      Volume: 180 Pages: 117-134

    • DOI

      10.1007/s10711-015-0094-4

    • Peer Reviewed
  • [Journal Article] Convergence of freely decomposable Kleinian groups2016

    • Author(s)
      Inkang Kim, Cyril Lecuire, Ken’ichi Ohshika
    • Journal Title

      Inventiones Mathematicae

      Volume: 201 Pages: 83-131

    • DOI

      10.1007/s00222-015-0609-5

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Poincare; series for non-Riemannian locally symmetric spaces2016

    • Author(s)
      F. Kassel and T. Kobayashi
    • Journal Title

      Advances in Mathematics

      Volume: 287 Pages: 123-236

    • DOI

      10.1016/j.aim.2015.08.029

    • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Differential symmetry breaking operators. I. General theory and F-method.2016

    • Author(s)
      T. Kobayashi and M. Pevzner
    • Journal Title

      Selecta Mathematica (N.S.)

      Volume: 22(2) Pages: 801-845

    • DOI

      10.1007/s00029-015-0207-9

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Differential symmetry breaking operators. II. Rankin-Cohen operators for symmetric pairs2016

    • Author(s)
      T. Kobayashi and M. Pevzner
    • Journal Title

      Selecta Mathematica (N.S.)

      Volume: 22(2) Pages: 847-911

    • DOI

      10.1007/s00029-015-0208-8

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Maximal semigroup symmetry and discrete Riesz transforms2016

    • Author(s)
      T. Kobayashi, A. Nilsson, and F. Sato
    • Journal Title

      Journal of the Australian Mathematical Society

      Volume: 100(2) Pages: 216-240

    • DOI

      10.1017/S144678871500049X

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Temperedness of reductive homogeneous spaces2015

    • Author(s)
      Y. Benoist and T. Kobayashi
    • Journal Title

      Journal of European Mathematical Society

      Volume: 17 Pages: 3015-3036

    • DOI

      10.4171/JEMS/578.

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] A program for branching problems in the representation theory of real reductive groups.2015

    • Author(s)
      T. Kobayashi
    • Journal Title

      Progress in Mathematics

      Volume: 312 Pages: 277-322

    • DOI

      10.1007/978-3-319-23443-4_10

    • Peer Reviewed
  • [Journal Article] Branching laws for Verma modules and applications in parabolic geometry. I2015

    • Author(s)
      T. Kobayashi, B. Orsted, P. Somberg, and V. Soucek
    • Journal Title

      Advances in Mathematics

      Volume: 285 Pages: 1796-1852

    • DOI

      10.1016/j.aim.2015.08.020

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Global uniqueness of small representations2015

    • Author(s)
      T. Kobayashi and G. Savin
    • Journal Title

      Mathematische Zeitschrift

      Volume: 281(1-2) Pages: 215-239

    • DOI

      10.1007/s00209-015-1481-0

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Intersections of curves on surfaces and their applications to mapping class groups,2015

    • Author(s)
      N. Kawazumi and Y. Kuno
    • Journal Title

      Ann. Inst. Fourier

      Volume: 65 Pages: 2711--2762

    • DOI

      doi: 10.5802/aif.3001

    • Peer Reviewed / Open Access
  • [Journal Article] On Klein-Maskit Combination Theorem in space II2015

    • Author(s)
      Liuan Li, Ken’ichi Ohshika, Xiantao Wang
    • Journal Title

      Kodai J. Math

      Volume: 38 Pages: 1-22

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Counting subgraphs in hyperbolic graphs with symmetry2015

    • Author(s)
      Calegari, Danny; Fujiwara, Koji
    • Journal Title

      J. Math. Soc. Japan

      Volume: 67 Pages: 1213-1226.

    • DOI

      10.2969/jmsj/06731213

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Subgroups generated by two pseudo-Anosov elements in a mapping class group. II. Uniform bound on exponents2015

    • Author(s)
      Fujiwara, Koji
    • Journal Title

      Trans. Amer. Math. Soc.

      Volume: 367 Pages: 4377-4405

    • DOI

      10.1090/S0002-9947-2014-06292-2

    • Peer Reviewed
  • [Journal Article] Transverse projective structures of foliations and infinitesimal derivatives of the Godbillon-Vey class2015

    • Author(s)
      Taro Asuke
    • Journal Title

      Internat. J. Math.

      Volume: 26 Pages: 1540001

    • DOI

      10.1142/S0129167X15400017

    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] Derivatives of secondary classes and 2-normal bundles of foliations2015

    • Author(s)
      Taro Asuke
    • Journal Title

      J. Math. Sci. Univ. Tokyo

      Volume: 22 Pages: 893-937

    • Peer Reviewed / Open Access
  • [Journal Article] Katz's middle convolution and Yokoyama's extending operation2015

    • Author(s)
      T. Oshima
    • Journal Title

      Opuscula Math.

      Volume: 35 Pages: 665--688

    • Peer Reviewed / Open Access
  • [Presentation] Symmetry breaking operators for real reductive groups2016

    • Author(s)
      T. Kobayashi
    • Organizer
      Workshop on New Developments in Representation Theory
    • Place of Presentation
      Singapore
    • Year and Date
      2016-03-14
    • Int'l Joint Research / Invited
  • [Presentation] F-method for Symmetry Breaking Operators, 32016

    • Author(s)
      T. Kobayashi
    • Organizer
      Geometry, Representation Theory, and Differential Equations
    • Place of Presentation
      Kyushu University
    • Year and Date
      2016-02-19
    • Int'l Joint Research / Invited
  • [Presentation] Differential equations related to Whittaker functions and moderate growth2016

    • Author(s)
      T. Oshima
    • Organizer
      International Conference Geometry, Representation Theory and Differential Equations
    • Place of Presentation
      九州大学 IMI Auditorium.
    • Year and Date
      2016-02-18
    • Int'l Joint Research / Invited
  • [Presentation] First order differential equations2016

    • Author(s)
      T. Oshima
    • Organizer
      International Conference of Partial Differential Equations:
    • Place of Presentation
      フィリピン,Cebu
    • Year and Date
      2016-01-14
    • Int'l Joint Research / Invited
  • [Presentation] Reducibility of hypergeometric equations2015

    • Author(s)
      T. Oshima
    • Organizer
      Algebraic analytic methods in complex partial differential equation
    • Place of Presentation
      京都大学数理解析研究所
    • Year and Date
      2015-12-10
    • Int'l Joint Research / Invited
  • [Presentation] Analysis on Non-Riemannian Locally Symmetric Spaces-An Application of Invariant Theory.2015

    • Author(s)
      T.Kobayashi
    • Organizer
      Symposium on Representation Theory 2015
    • Place of Presentation
      Izu-Nagaoka, Shizuoka, Japan
    • Year and Date
      2015-11-17 – 2015-11-20
    • Int'l Joint Research / Invited
  • [Presentation] Analysis on Non-Riemannian Locally Symmetric Spaces-An Application of Branching Laws.2015

    • Author(s)
      T. Kobayashi
    • Organizer
      Workshop: Branching Laws, Quantum Ergodicity, Wave Front Sets & Resonances
    • Place of Presentation
      Reims University, France
    • Year and Date
      2015-10-23 – 2015-10-24
    • Int'l Joint Research / Invited
  • [Presentation] Deformation spaces of Kleinian groups2015

    • Author(s)
      K. Ohshika
    • Organizer
      Topology and Groups
    • Place of Presentation
      University of Goa
    • Year and Date
      2015-10-17 – 2015-10-18
    • Int'l Joint Research / Invited
  • [Presentation] Linear ordinary differential equations in the complex domain and hypergeometric systems2015

    • Author(s)
      T. Oshima
    • Organizer
      Microlocal Analysis and Singular Perturbation Theory
    • Place of Presentation
      京都大学数理解析研究所
    • Year and Date
      2015-10-08
    • Int'l Joint Research / Invited
  • [Presentation] Drawing Curves2015

    • Author(s)
      T. Oshima
    • Organizer
      MEIS 2015 : Mathematical Progress in Expressive Image Synthesis
    • Place of Presentation
      Kyushu University.
    • Year and Date
      2015-09-27
    • Int'l Joint Research / Invited
  • [Presentation] Teichmuller space; its asymptotic geometry, compactifications, and combinatorial models2015

    • Author(s)
      K. Ohshika
    • Organizer
      Finsler geometry and applications to low-dimensional geometry and topology and moduli spaces
    • Place of Presentation
      University of Cagliari
    • Year and Date
      2015-09-21 – 2015-09-23
    • Int'l Joint Research / Invited
  • [Presentation] Group actions on quasi-trees and quasi-morphisms.2015

    • Author(s)
      藤原耕二
    • Organizer
      日本数学会秋季総合分科会
    • Place of Presentation
      京都産業大学
    • Year and Date
      2015-09-14
    • Invited
  • [Presentation] Hypergeometric functions with several variables2015

    • Author(s)
      T. Oshima
    • Organizer
      Analytic, Algebraic and Geometric Aspects of Differential Equations
    • Place of Presentation
      Bedlewo, Poland
    • Year and Date
      2015-09-13
    • Int'l Joint Research / Invited
  • [Presentation] Normalized entropy versus volume for pseudo-Anosovs2015

    • Author(s)
      小島定吉
    • Organizer
      CREST暗号数理ミニワークショップ
    • Place of Presentation
      九州大学
    • Year and Date
      2015-09-04
    • Invited
  • [Presentation] Various compactifications of Teichmuller spaces and their relations2015

    • Author(s)
      K. Ohshika
    • Organizer
      Geometric structures and related topics
    • Place of Presentation
      KIAS
    • Year and Date
      2015-08-25 – 2015-08-26
    • Int'l Joint Research / Invited
  • [Presentation] Algebraic aspects of the Goldman-Turaev Lie bialgebra2015

    • Author(s)
      N. Kawazumi
    • Organizer
      workshop "GRT, MZVs and associators"
    • Place of Presentation
      Hôtel Les Sources, Les Diablerets. (スイス)
    • Year and Date
      2015-08-21
    • Int'l Joint Research / Invited
  • [Presentation] Group actions on quasi-trees and its application, 1-4.2015

    • Author(s)
      Koji Fujiwara
    • Organizer
      The 13th Geometric Topology Fair in Korea.
    • Place of Presentation
      Gyeongju, Korea
    • Year and Date
      2015-08-10 – 2015-08-13
    • Int'l Joint Research / Invited
  • [Presentation] Accumulation of closed 3-manifolds within character varieties2015

    • Author(s)
      K. Ohshika
    • Organizer
      A workshop on geometric group theory & low-dimensional topology
    • Place of Presentation
      Gyeonju
    • Year and Date
      2015-08-10
    • Int'l Joint Research / Invited
  • [Presentation] Normalized entropy versus volume for pseudo-Anosovs2015

    • Author(s)
      小島定吉
    • Organizer
      第62回トポロジーシンポジウム
    • Place of Presentation
      名古屋工業大学
    • Year and Date
      2015-08-06
    • Invited
  • [Presentation] 曲面上の曲線の交叉のテンソル表示について2015

    • Author(s)
      河澄響矢
    • Organizer
      第203回数理情報科学談話会
    • Place of Presentation
      鹿児島大学理学部数理情報科学科
    • Year and Date
      2015-07-10
    • Invited
  • [Presentation] On the group of real analytic diffeomorphisms2015

    • Author(s)
      Tsuboi, Takashi
    • Organizer
      Geometries en action
    • Place of Presentation
      Lyon, France
    • Year and Date
      2015-07-03
    • Int'l Joint Research / Invited
  • [Presentation] Geometry of contracting geodesics.2015

    • Author(s)
      Koji Fujiwara
    • Organizer
      Conference on Geometric Group Theory
    • Place of Presentation
      Wroclaw, Poland
    • Year and Date
      2015-07-02
    • Int'l Joint Research / Invited
  • [Presentation] Analysis of Minimal Representatinons-"Geometric Quantization" of Minimal Nilpotent Orbits2015

    • Author(s)
      T.Kobayashi
    • Organizer
      Analytic Representation Theory of Lie Groups
    • Place of Presentation
      Kavli IPMU, the University of Tokyo
    • Year and Date
      2015-07-01 – 2015-07-04
    • Int'l Joint Research / Invited
  • [Presentation] Handlebody subgroups in mapping class groups.2015

    • Author(s)
      Koji Fujiwara
    • Organizer
      Dubrovnik VIII - Geometric Topology, Geometric Group Theory & Dynamical Systems
    • Place of Presentation
      Inter-University Centre Dubrovnik, Croatia
    • Year and Date
      2015-06-24
    • Int'l Joint Research / Invited
  • [Presentation] A tensorial description of the Turaev cobracket on genus 0 compact surfaces,2015

    • Author(s)
      河澄響矢
    • Organizer
      研究集会「離散群と双曲空間の幾何と解析」
    • Place of Presentation
      京都大学数理解析研究所
    • Year and Date
      2015-06-22
    • Invited
  • [Presentation] Global Geometry and Analysis on Locally Symmetric Spaces with Indefinite-metric2015

    • Author(s)
      T.Kobayashi
    • Organizer
      The 11th International Workshop: Lie Theory and Its Applications in Physics (LT-11)
    • Place of Presentation
      Varna, Bulgaria
    • Year and Date
      2015-06-15 – 2015-06-21
    • Int'l Joint Research / Invited
  • [Presentation] The origin of the notion of manifold2015

    • Author(s)
      K. Ohshika
    • Organizer
      Conference "Geometry in History"
    • Place of Presentation
      Universte de Strasbourg
    • Year and Date
      2015-06-11
    • Int'l Joint Research / Invited
  • [Presentation] Geography of closed 3-manifolds within character varieties2015

    • Author(s)
      K. Ohshika
    • Organizer
      French-Japanese workshop on Teichmuller spaces and surface mapping class groups
    • Place of Presentation
      Universte de Strasbourg
    • Year and Date
      2015-06-05
    • Int'l Joint Research / Invited
  • [Presentation] A tensorial description of the Turaev cobracket on genus 0 compact surfaces2015

    • Author(s)
      N. Kawazumi
    • Organizer
      French-Japanese workshop on Teichmueller spaces and surface mapping class groups,
    • Place of Presentation
      IRMA, University of Strasbourg. (フランス)
    • Year and Date
      2015-06-04
    • Int'l Joint Research / Invited
  • [Presentation] Analysis on Non-Riemannian Locally Symmetric Spaces-An Application of Invariant Theory2015

    • Author(s)
      T.Kobayashi
    • Organizer
      Harmonic Analysis, Group Representations, Automorphic Forms and Invariant Theory
    • Place of Presentation
      Yale University, USA
    • Year and Date
      2015-06-01 – 2015-06-05
    • Int'l Joint Research / Invited
  • [Presentation] Geometry of contracting geodesics.2015

    • Author(s)
      Koji Fujiwara
    • Organizer
      Cornell Topology Festival
    • Place of Presentation
      Cornell U, USA
    • Year and Date
      2015-05-08
    • Int'l Joint Research / Invited
  • [Presentation] Handlebody subgroups in mapping class groups.2015

    • Author(s)
      Koji Fujiwara
    • Organizer
      Cornell Topology Festival
    • Place of Presentation
      Cornell U, USA
    • Year and Date
      2015-05-08
    • Int'l Joint Research / Invited
  • [Presentation] Growth in Groups2015

    • Author(s)
      Koji Fujiwara
    • Organizer
      HeKKSaGOn Presidential Conferences.
    • Place of Presentation
      Tohoku Univ. Japan.
    • Year and Date
      2015-04-17
    • Int'l Joint Research / Invited
  • [Book] 幾何学II ホモロジー入門2016

    • Author(s)
      坪井 俊
    • Total Pages
      320
    • Publisher
      東京大学出版会
  • [Book] Symmetry Breaking for Representations of Rank One Orthogonal Groups2015

    • Author(s)
      T. Kobayashi and B. Speh
    • Total Pages
      118
    • Publisher
      American Mathematical Society

URL: 

Published: 2017-01-06  

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