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A differential geometric approach to discrete group theory

Research Project

Project/Area Number 18540062
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Geometry
Research InstitutionTohoku University

Principal Investigator

IZEKI Hiroyasu  Tohoku University, 大学院・理学研究科, 准教授 (90244409)

Co-Investigator(Kenkyū-buntansha) KOTANI Motoko  東北大学, 大学院・理学研究科, 教授 (50230024)
FUJIWARA Koji  東北大学, 大学院・情報科学研究科, 教授 (60229078)
KANAI Masahiko  名古屋大学, 大学院・多元数理科学研究科, 教授 (70183035)
NAYATANI Shin  名古屋大学, 大学院・多元数理科学研究科, 教授 (70222180)
Co-Investigator(Renkei-kenkyūsha) KOTANI Motoko  東北大学, 大学院・理学研究科, 教授 (50230024)
(FUJIWARA Koji  東北大学, 大学院・情報科学研究科, 教授 (60229078)
KANAI Masahiko  名古屋大学, 大学院・多元数理科学研究科, 教授 (70183035)
NAYATANI Shin  名古屋大学, 大学院・多元数理科学研究科, 教授 (70222180)
Research Collaborator KONDO Takefumi  神戸大学, 大学院・理学研究科, GCOE博士研究員
Project Period (FY) 2006 – 2008
Project Status Completed (Fiscal Year 2008)
Budget Amount *help
¥4,060,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥660,000)
Fiscal Year 2008: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2007: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2006: ¥1,200,000 (Direct Cost: ¥1,200,000)
Keywords離散群 / 非正曲率距離空間 / 調和写像 / 固定点性質 / 剛性 / 非正曲率空間
Research Abstract

空間の対称性を数学的に記述するときに用いられる概念が「群」および「群の空間への作用」である。本研究では、どのような群がどのような空間に作用し得るかを、幾何学的な手法で研究した。その際に用いられるのは、群の空間への作用の様子のもっとも効率のよい実現を与える調和写像と呼ばれる写像である。この研究成果から、ある種の空間に非自明な仕方で作用し得ない群が非常に多く存在することが明らかになった。

Report

(4 results)
  • 2008 Annual Research Report   Final Research Report ( PDF )
  • 2007 Annual Research Report
  • 2006 Annual Research Report
  • Research Products

    (21 results)

All 2008 2007 2006 Other

All Journal Article (15 results) (of which Peer Reviewed: 10 results) Presentation (6 results)

  • [Journal Article] A note on spaces of asymptotic dimension one2007

    • Author(s)
      Koji Fujiwara and Kevin Whyte
    • Journal Title

      Algebr. Geom. Topol. 7

      Pages: 1063-1070

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Quasi-homomorphisms on mapping class groups2007

    • Author(s)
      Koji Fujiwara and Mladen Bestvina
    • Journal Title

      Glas. Mat. Ser. III 42

      Pages: 213-236

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] A fixed-point theorem for discrete-group actions on Hadamard spaces2006

    • Author(s)
      井関裕靖・近藤剛史・納谷信
    • Journal Title

      京都大学数理科学研究所講究録 1492

      Pages: 56-64

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] 調和写像による超剛性定理および固定点定理へのアプローチ2006

    • Author(s)
      井関裕靖・納谷信
    • Journal Title

      数学 58

      Pages: 239-262

    • NAID

      10018386816

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] A fixed-point theorem for discrete-group actions on Hadamard spaces2006

    • Author(s)
      井関裕靖, 近藤剛史, 納谷信
    • Journal Title

      京都大学数理解析研究所講究録 1492

      Pages: 56-64

    • Related Report
      2006 Annual Research Report
  • [Journal Article] 調和写像による超剛性定理および固定点定理へのアプローチ2006

    • Author(s)
      井関裕靖, 納谷信
    • Journal Title

      数学 58

      Pages: 239-262

    • NAID

      10018386816

    • Related Report
      2006 Annual Research Report
  • [Journal Article] JSJ-decompositions of finitely presented groups and complexes of groups2006

    • Author(s)
      K.Fujiwara, P.Papasogulu
    • Journal Title

      Geom. and Funct. Anal. 16

      Pages: 70-125

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Fixed point set of parabolic isometries of CAT(0)-spaces2006

    • Author(s)
      K.Fujiwara, K.Nagano, T.Shioya
    • Journal Title

      Comm. Math. Helv. 81

      Pages: 305-335

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Large deviation and the tangent cone at infinity of a crystal lattice2006

    • Author(s)
      M.Kotani, T.Sunada
    • Journal Title

      Math. Z. 254

      Pages: 837-870

    • Related Report
      2006 Annual Research Report
  • [Journal Article] A fixed-point property of finitely generated groups and an energy of equivariant maps

    • Author(s)
      Hiroyasu Izeki
    • Journal Title

      proceedings of the 1^<st> MSJ-SI "Probabilistic Approach to Geometry" (掲載決定)

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] Fixed-point property of random groups

    • Author(s)
      Hiroyasu Izeki, Takefumi Kondo,and Shin Nayatani
    • Journal Title

      Annals of Global Analysis and Geometry (掲載決定)

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] An approach to superrigidity and fixed-point theorems via harmonic maps

    • Author(s)
      Hiroyasu Izeki
    • Journal Title

      Sugaku Exposition (掲載決定)

    • Related Report
      2008 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Fixed-point property of random groups

    • Author(s)
      Hiroyasu Izeki
    • Journal Title

      Annals of Global Analysis and Geometry (掲載決定)

    • Related Report
      2008 Annual Research Report
    • Peer Reviewed
  • [Journal Article] A fixed-point property of finitely generated groups and an energy of equivariant maps

    • Author(s)
      Hiroyasu Izeki
    • Journal Title

      Proceedings of the 1^<st> MSJ-SI, "Probabilis tic Approach to Geometry" (掲載決定)

    • Related Report
      2008 Annual Research Report
    • Peer Reviewed
  • [Journal Article] An approach to superrigidity and fixed-point theorems via harmonic maps

    • Author(s)
      Hiroyasu Izeki and Shin Nayatani
    • Journal Title

      Sugaku Exposition (掲載確定)

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Presentation] A fixed-point property of discrete groups and an energy of equivariant maps2008

    • Author(s)
      Hiroyasu Izeki
    • Organizer
      1^<st> MSJ-SI "Probabilistic Approach to Geometry"
    • Place of Presentation
      京都大学
    • Year and Date
      2008-08-05
    • Related Report
      2008 Annual Research Report 2008 Final Research Report
  • [Presentation] Fixed-point property of random groups via energy of maps2008

    • Author(s)
      Shin Nayatani
    • Organizer
      Geometric Group Theory, Geometric Analysis and Mapping Class Groups
    • Place of Presentation
      Johns Hopkins大学
    • Year and Date
      2008-05-05
    • Related Report
      2008 Final Research Report
  • [Presentation] 同変写像のエネルギーとランダム群に対する固定点定理2008

    • Author(s)
      井関 裕靖
    • Organizer
      福岡微分幾何学研究会
    • Place of Presentation
      福岡大学セミナーハウス
    • Year and Date
      2008-01-11
    • Related Report
      2007 Annual Research Report
  • [Presentation] 固定点性質と同変写像のエネルギー2007

    • Author(s)
      井関裕靖
    • Organizer
      RIMS共同研究「離散群と作用素環論」
    • Place of Presentation
      京都大学数理解析研究所
    • Year and Date
      2007-02-01
    • Related Report
      2008 Final Research Report
  • [Presentation] Fixed-point property of discrete groups2006

    • Author(s)
      井関裕靖
    • Organizer
      研究集会「大域解析と微分幾何-その情報科学への関わり-」
    • Place of Presentation
      東北大学大学院情報科学研究科
    • Year and Date
      2006-10-22
    • Related Report
      2008 Final Research Report
  • [Presentation] ランダム群に対する固定点定理2006

    • Author(s)
      井関裕靖
    • Organizer
      第49回函数論シンポジウム
    • Place of Presentation
      東京工業大学
    • Year and Date
      2006-09-15
    • Related Report
      2008 Final Research Report

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Published: 2006-04-01   Modified: 2016-04-21  

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