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2014 Fiscal Year Annual Research Report

クライン群とタイヒミュラー空間の大域幾何的研究

Research Project

Project/Area Number 22244005
Research InstitutionOsaka University

Principal Investigator

大鹿 健一  大阪大学, 理学(系)研究科(研究院), 教授 (70183225)

Co-Investigator(Kenkyū-buntansha) 宮地 秀樹  大阪大学, 理学(系)研究科(研究院), 准教授 (40385480)
和田 昌昭  大阪大学, 情報科学研究科, 教授 (80192821)
河澄 響矢  東京大学, 数理(科)学研究科(研究院), 准教授 (30214646)
Project Period (FY) 2010-04-01 – 2016-03-31
KeywordsKlein群 / Teichmuller空間 / 3次元多様体
Outline of Annual Research Achievements

大鹿は,Klein群の列の発散に伴う,3次元多様体の退化の問題について,それを幾何的に実現する条件を決定した.また宮地,Vincent Albergeと共同で,Teichmuller空間の様々なコンパクト化の共通の共通の土台となるべき空間,null-set compactificationの概念を考え出し,それが写像類群の作用について剛性を持っていることを証明した.さらにChris Leninger, Woojin Jeon, Illia Kapovichと共同で,Gromov双曲群がconvergence groupとして作用していて,無限遠境界からのCannon-Thurston写像が定義されているとき,non-conical limit pointは常にC-T写像の非単射像になるかという従来から考えられていた問題に対して,否定的に決着をつけた.そしてもう一つの宮地との共同研究では,極致的長さの微分を交わり数で表す公式の新たな証明を与え,それの応用として,Thurston symplectic形式を用いたTeichmuller空間の埋め込みを与えた.最後にTeichmuller空間のコンパクト化や,Klein群の幾何的極限についてのこれまでの結果を総合する論文を執筆し,出版した.宮地は上の大鹿との共同研究の他,極致的長さを用いたTeichmuller空間の複素解析的研究を推し進めた.特にholomorphic discの剛性に関する結果を得た.さらにVincent Albergeとの共同で,Teichmuller discのhorocyclic flowのGardiner-Masur埋め込みでの漸近的振る舞いについての研究を進めた.

Research Progress Status

27年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

27年度が最終年度であるため、記入しない。

  • Research Products

    (25 results)

All 2017 2016 2015 2014 Other

All Int'l Joint Research (2 results) Journal Article (13 results) (of which Int'l Joint Research: 6 results,  Peer Reviewed: 13 results,  Acknowledgement Compliant: 6 results) Presentation (9 results) (of which Int'l Joint Research: 8 results,  Invited: 9 results) Funded Workshop (1 results)

  • [Int'l Joint Research] University of Strasbourg(フランス)

    • Country Name
      FRANCE
    • Counterpart Institution
      University of Strasbourg
  • [Int'l Joint Research] KIAS(韓国)

    • Country Name
      KOREA (REP. OF KOREA)
    • Counterpart Institution
      KIAS
  • [Journal Article] Measurable Rigidity for Kleinian groups2017

    • Author(s)
      Woojin Jeon, Ken'ichi Ohshika
    • Journal Title

      Ergodic Th. Dyn. Sys.

      Volume: 未定 Pages: 未定

    • DOI

      10.1017/etds.2015.15

    • Peer Reviewed
  • [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: 204 Pages: 83-131

    • DOI

      10.1007/s00222-015-0609-5

    • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Null-set compactifications of Teichmuller spaces2016

    • Author(s)
      Vincent Alberge, Hideki Miyachi, Ken'ichi Ohshika
    • Journal Title

      Handbook of Teichmuller theory

      Volume: 6 Pages: 71-94

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Conical limit points and the Cannon-Thurston map2016

    • Author(s)
      Woojin Jeon, Illia Kapovich, Chris Leninger, Ken'ichi Ohshika
    • Journal Title

      Conformal Geometry and Dynamics

      Volume: 未定 Pages: 未定

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Geometric limits of Kleinian groups and their applications2015

    • Author(s)
      Ken'ichi Ohshika
    • Journal Title

      Handbook of Group Actions

      Volume: 2 Pages: 245-270

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

    • Author(s)
      Liulan Li, Ken'ichi Ohshika, Xiantao Wang
    • Journal Title

      Kodai Journal of Math.

      Volume: 38 Pages: 1-22

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] A rigidity theorem for holomorphic disks in Teichmuller spaces2015

    • Author(s)
      Hideki Miyachi
    • Journal Title

      Proc AMS

      Volume: 143 Pages: 2949-2957

    • DOI

      10.1090/S0002-9939-2015-12488-4

    • Peer Reviewed
  • [Journal Article] Reduced Bers boundaries of Teichmuller spaces2014

    • Author(s)
      Ken'ichi Ohshika
    • Journal Title

      Ann. Inst. Fourier

      Volume: 64 Pages: 145-176

    • DOI

      10.5802/aif.2842

    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Primitive stable representations of free Kleinian groups2014

    • Author(s)
      Woojin Jeon, Inkang Kim, Ken'ichi Ohshika, Cyril Lecuire
    • Journal Title

      Israel J. Math.

      Volume: 199 Pages: 841-866

    • DOI

      10.1007/s11856-013-0062-3

    • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Primitive stable closed hyperbolic 3-manifolds2014

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

      Topology Appl.

      Volume: 172 Pages: 68-71

    • DOI

      10.1016/j.topol.2014.05.003

    • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Compactifications of Teichmuller spaces2014

    • Author(s)
      Ken'ichi Ohshika
    • Journal Title

      Handbook of Teichmuller theory

      Volume: 4 Pages: 235-254

    • DOI

      10.4171/117-1/6

    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Weil-Petersson Funk metric on Teichmuller space2014

    • Author(s)
      Hideki Miyachi, Ken'ichi Ohshika, Sumio Yamada
    • Journal Title

      Handbook of Hilbert geometry

      Volume: なし Pages: 339--352

    • DOI

      10.4171/147-1/12

    • Peer Reviewed / Acknowledgement Compliant
  • [Presentation] Deformation spaces of Kleinian groups2015

    • Author(s)
      Ken'ichi Ohshika
    • Organizer
      Topology and Groups
    • Place of Presentation
      University of Goa,インド
    • Year and Date
      2015-10-17 – 2015-10-18
    • Int'l Joint Research / Invited
  • [Presentation] Teichmuller space; its asymptotic geometry, compactifications, and combinatorial models2015

    • Author(s)
      Ken'ichi Ohshika
    • Organizer
      Finsler geometry and applications to low-dimensional geometry and topology and moduli spaces
    • Place of Presentation
      University of Cagliari,イタリア
    • Year and Date
      2015-09-21 – 2015-09-22
    • Int'l Joint Research / Invited
  • [Presentation] Various compactifications of Teichmuller spaces and their relations2015

    • Author(s)
      Ken'ichi Ohshika
    • Organizer
      Geometric structures and related topics
    • Place of Presentation
      KIAS, Yang Yang,韓国
    • Year and Date
      2015-08-25 – 2015-08-26
    • Int'l Joint Research / Invited
  • [Presentation] Accumulation of closed 3-manifolds within character varieties2015

    • Author(s)
      Ken'ichi Ohshika
    • Organizer
      Geometric Topology Fair in Korea
    • Place of Presentation
      K Hotel, Gyeonju,韓国
    • Year and Date
      2015-08-10
    • Int'l Joint Research / Invited
  • [Presentation] The origin of the notion of manifold2015

    • Author(s)
      Ken'ichi Ohshika
    • Organizer
      Geometry in History
    • Place of Presentation
      IRMA University of Strasbourg,フランス
    • Year and Date
      2015-06-11
    • Int'l Joint Research / Invited
  • [Presentation] Geography of closed 3-manifolds within character varieties2015

    • Author(s)
      Ken'ichi Ohshika
    • Organizer
      French-Japanese workshop on Teichmuller spaces and surface mapping class groups
    • Place of Presentation
      IRMA University of Strasbourg, フランス
    • Year and Date
      2015-06-05
    • Int'l Joint Research / Invited
  • [Presentation] Hyperbolic 3-manifolds and the Schottky space viewed as lying in the character variety2014

    • Author(s)
      Ken'ichi Ohshika
    • Organizer
      Group Action Forum
    • Place of Presentation
      Tsinghua-Sanya Math Forum, 中国
    • Year and Date
      2014-12-16
    • Int'l Joint Research / Invited
  • [Presentation] Klein群の幾何とその応用2014

    • Author(s)
      大鹿健一
    • Organizer
      日本数学会秋季総合分科会総合講演
    • Place of Presentation
      広島大学
    • Year and Date
      2014-09-26
    • Invited
  • [Presentation] The work of Thurston on Kleinian groups2014

    • Author(s)
      Ken'ichi Ohshika
    • Organizer
      Around Thurston-Grothendieck-Teichmuller theories
    • Place of Presentation
      IRMA University of Strasbourg, フランス
    • Year and Date
      2014-05-12 – 2014-05-15
    • Int'l Joint Research / Invited
  • [Funded Workshop] MSJ-SI Hyperbolic geometry and geometric group theory2014

    • Place of Presentation
      東京大学
    • Year and Date
      2014-07-30 – 2014-08-05

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Published: 2017-01-06  

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