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Study of problems on discrete groups by geometric methods

Research Project

Project/Area Number 21340014
Research Category

Grant-in-Aid for Scientific Research (B)

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

Principal Investigator

NAYATANI Shin  名古屋大学, 多元数理科学研究科, 教授 (70222180)

Co-Investigator(Renkei-kenkyūsha) KANAI Masahiko  東京大学, 大学院・数理科学研究科, 教授 (70183035)
KOTANI Motoko  東北大学, 大学院・理学研究科, 教授 (50230024)
NAITO Hisashi  名古屋大学, 多元数理科学研究科, 准教授 (40211411)
IZEKI Hiroyasu  慶応義塾大学, 理工学部, 教授 (90244409)
KAMADA Hiroyuki  宮城教育大学, 教育学部, 教授 (00249799)
KOBAYASHI Toshimasa  摂南大学, 工学部, 講師 (30399125)
ITO Kentaro  名古屋大学, 多元数理科学研究科, 准教授 (00324400)
KONDO Takefumi  神戸大学, 理学研究科, GCOE博士研究員 (60467446)
Project Period (FY) 2009-04-01 – 2014-03-31
Project Status Completed (Fiscal Year 2013)
Budget Amount *help
¥16,900,000 (Direct Cost: ¥13,000,000、Indirect Cost: ¥3,900,000)
Fiscal Year 2013: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2012: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2011: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2010: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2009: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Keywords固定点性質 / CAT(0)空間 / ランダム群 / 不変量δ / 非線形スペクトルギャップ / 四元数CR構造 / ツイスター空間 / 強擬凸CR多様体 / Rumin複体 / ボホナー・ワイツェンベック型公式 / 四元数接触構造 / 田中ウィブスター接続 / Biquard接続 / 四元数CR幾何 / 田中-ウェブスター接続 / ビルディング
Research Abstract

We proved that Gromov's group containing quasi-isometric image of expanders has fixed-point property for a large class of CAT(0) spaces. In relation to the possible geometric proof of the Margulis superrigidity theorem, we studied a certain geometric invariant of the 2-dimensional Euclidean building associated to PGL(3,Q_p). In the case p=2, we made progress on the related deformation problem of polyhedral. Motivated by a certain rigidity problem on discrete groups, we studied conformal-geometric structures such as strongly pseudoconvex CR structures and quaternionic CR structures, and obtained some results.

Report

(6 results)
  • 2013 Annual Research Report   Final Research Report ( PDF )
  • 2012 Annual Research Report
  • 2011 Annual Research Report
  • 2010 Annual Research Report
  • 2009 Annual Research Report
  • Research Products

    (63 results)

All 2014 2013 2012 2011 2010 2009 Other

All Journal Article (11 results) (of which Peer Reviewed: 10 results) Presentation (52 results) (of which Invited: 4 results)

  • [Journal Article] Quaternionic CR geometry2013

    • Author(s)
      鎌田博行, 納谷信
    • Journal Title

      Hokkaido Mathematical Journal

      Volume: 42 Pages: 159-207

    • Related Report
      2013 Final Research Report
    • Peer Reviewed
  • [Journal Article] Quaternionic CR geometry2013

    • Author(s)
      納谷信、鎌田博行
    • Journal Title

      Hokkaido Mathematical Journal

      Volume: 42

    • Related Report
      2013 Annual Research Report
    • Peer Reviewed
  • [Journal Article] N-step energy of maps and fixed-point property of random groups2012

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

      Groups, Geometry, and Dynamics

      Volume: 6 Pages: 701-736

    • Related Report
      2013 Final Research Report
    • Peer Reviewed
  • [Journal Article] CAT(0) spaces and expanders2012

    • Author(s)
      近藤剛史
    • Journal Title

      Mathematische Zeitschrift

      Volume: 271 Pages: 343-355

    • Related Report
      2013 Final Research Report
    • Peer Reviewed
  • [Journal Article] N-step energy of maps and fixed-point property of random groups2012

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

      Groups, Geometry, and Dynamics

      Volume: 6 Issue: 4 Pages: 701-736

    • DOI

      10.4171/ggd/171

    • Related Report
      2012 Annual Research Report
    • Peer Reviewed
  • [Journal Article] An approach to superrigidity and fixed-point theorems via harmonic maps2010

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

      Selected papers on analysis and differential equations

      Volume: 230 Pages: 135-160

    • Related Report
      2013 Final Research Report
    • Peer Reviewed
  • [Journal Article] 調和写像と超剛性・固定点性質2010

    • Author(s)
      納谷信
    • Journal Title

      数理解析研究所講究録

      Volume: 1720 Pages: 112-138

    • Related Report
      2013 Final Research Report 2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] An approach to superrigidity and fixed-point theorems via harmonic maps2010

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

      AMS Translations

      Volume: 230 Pages: 135-160

    • Related Report
      2010 Annual Research Report
  • [Journal Article] Fixed-point property of random groups2009

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

      Annals of Global Analysis and Geometry

      Volume: 35 Pages: 363-379

    • Related Report
      2013 Final Research Report
    • Peer Reviewed
  • [Journal Article] Fixed-point property of random groups2009

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

      Annals of Global Analysis and Geometry 35

      Pages: 363-379

    • Related Report
      2009 Annual Research Report
    • Peer Reviewed
  • [Journal Article] N-step energy of maps and fixed-point property of random groups

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

      Groups, Geometry, and Dynamics

      Volume: (掲載確定)(掲載予定)(未定)

    • Related Report
      2011 Annual Research Report
    • Peer Reviewed
  • [Presentation] Rumin-Bochner formula for 1-forms on a CR manifold2014

    • Author(s)
      納谷信
    • Organizer
      The second Japanese-Spanish workshop on Differential Geometry
    • Place of Presentation
      東京工業大学
    • Related Report
      2013 Final Research Report
  • [Presentation] Quaternionic CR structure, Progress of geometric structures on manifolds2014

    • Author(s)
      鎌田博行
    • Organizer
      名城大学幾何学研究集会
    • Place of Presentation
      名城大学
    • Related Report
      2013 Final Research Report
  • [Presentation] Rumin-Bochner formula for 1-forms on a CR manifold2014

    • Author(s)
      納谷信
    • Organizer
      第2回日本スペイン幾何学研究集会
    • Place of Presentation
      東京工業大学
    • Related Report
      2013 Annual Research Report
    • Invited
  • [Presentation] Mendel-Naor, ``Expanders with respect to Hadamard spaces and random graphs''の第3節の解説2014

    • Author(s)
      納谷信
    • Organizer
      勉強会: 非線形スペクトルギャップとエクスパンダー
    • Place of Presentation
      サンヒルズ三河湾
    • Related Report
      2013 Annual Research Report
  • [Presentation] 離散群の離散群の剛性への幾何学的アプローチ--個々の群からランダム群へ2013

    • Author(s)
      納谷信
    • Organizer
      談話会
    • Place of Presentation
      東北大学
    • Related Report
      2013 Final Research Report
  • [Presentation] Fixed-point property of infinite groups2013

    • Author(s)
      納谷信
    • Organizer
      The 5th OCAMI-TIMS Joint International Workshop on Differential Geometry and Geometric Analysis
    • Place of Presentation
      大阪市立大学
    • Related Report
      2013 Final Research Report
  • [Presentation] Mendel-Naor, ``Expanders with respect to Hadamard spaces and random graphs''2013

    • Author(s)
      納谷信
    • Organizer
      第3節の解説,勉強会「非線形スペクトルギャップとエクスパンダー」
    • Place of Presentation
      サンヒルズ三河湾
    • Related Report
      2013 Final Research Report
  • [Presentation] Rumin複体に対するシャープなボホナー公式を目指して2013

    • Author(s)
      納谷信
    • Organizer
      福岡大学微分幾何研究会
    • Place of Presentation
      福岡大学セミナーハウス
    • Related Report
      2013 Annual Research Report 2013 Final Research Report
  • [Presentation] Rumin複体に対するシャープなBochner公式を目指して2013

    • Author(s)
      納谷信
    • Organizer
      距離の幾何学探求勉強会
    • Place of Presentation
      琵琶湖コンファレンスセンター
    • Related Report
      2013 Final Research Report 2012 Annual Research Report
  • [Presentation] Fixed-point property of infinite groups2013

    • Author(s)
      納谷信
    • Organizer
      Discrete Geometry and Dynamical Systems
    • Place of Presentation
      京都大学
    • Related Report
      2013 Final Research Report 2012 Annual Research Report
  • [Presentation] Fixed-point property of infinite groups2013

    • Author(s)
      納谷信
    • Organizer
      第5回国際ワークショップ 「微分幾何学と幾何解析
    • Place of Presentation
      大阪市立大学
    • Related Report
      2012 Annual Research Report
    • Invited
  • [Presentation] ランダム群のL^p空間に対する固定点性質2012

    • Author(s)
      井関裕靖
    • Organizer
      福岡大学微分幾何研究会
    • Place of Presentation
      福岡大学セミナーハウス
    • Year and Date
      2012-11-03
    • Related Report
      2013 Final Research Report
  • [Presentation] 木の非線形スペクトルギャップ2012

    • Author(s)
      近藤剛史, 豊田哲
    • Organizer
      日本数学会2012年度年会
    • Place of Presentation
      東京理科大学神楽坂キャンパス
    • Year and Date
      2012-03-28
    • Related Report
      2013 Final Research Report
  • [Presentation] Poincare inequality and fixed point property of isometric group actions2012

    • Author(s)
      近藤剛史
    • Organizer
      Group actions and K-theory
    • Place of Presentation
      京都大学数学教室
    • Year and Date
      2012-03-15
    • Related Report
      2013 Final Research Report
  • [Presentation] Deformation of polyhedra towards Margulis superrigidity2012

    • Author(s)
      納谷信
    • Organizer
      極小曲面と幾何構造
    • Place of Presentation
      名城大学(招待講演)
    • Year and Date
      2012-03-06
    • Related Report
      2011 Annual Research Report
  • [Presentation] Wirtingerの不等式と非線形スペクトルギャップ2012

    • Author(s)
      近藤 剛史
    • Organizer
      淡路島幾何学研究集会2012
    • Place of Presentation
      南あわじ市松帆古津路国民宿舎慶野松原荘
    • Year and Date
      2012-01-28
    • Related Report
      2013 Final Research Report
  • [Presentation] 四元数CR幾何2012

    • Author(s)
      納谷信
    • Organizer
      東大複素解析幾何セミナー
    • Place of Presentation
      東京大学
    • Related Report
      2013 Final Research Report
  • [Presentation] 四元数CR構造について2012

    • Author(s)
      鎌田博行
    • Organizer
      シンプレクティック幾何とその周辺2012
    • Place of Presentation
      放送大学秋田学習センター
    • Related Report
      2013 Final Research Report
  • [Presentation] Quaternionic CR geometry2012

    • Author(s)
      納谷信
    • Organizer
      18回複素幾何シンポジウム
    • Place of Presentation
      信州菅平高原プチホテルゾンタック
    • Related Report
      2013 Final Research Report
  • [Presentation] Quaternionic contact/CR geometry2012

    • Author(s)
      納谷信
    • Organizer
      福岡大学微分幾何研究会
    • Place of Presentation
      福岡大学セミナーハウス
    • Related Report
      2013 Final Research Report
  • [Presentation] Deformation of polyhedra towards Margulis superrigidity2012

    • Author(s)
      納谷信
    • Organizer
      極小曲面と幾何構造
    • Place of Presentation
      名城大学
    • Related Report
      2013 Final Research Report
  • [Presentation] Quaternionic contact/CR geometry2012

    • Author(s)
      納谷信
    • Organizer
      Geometry and Something (福岡大学微分幾何研究会)
    • Place of Presentation
      福岡大学セミナーハウス
    • Related Report
      2012 Annual Research Report
    • Invited
  • [Presentation] Quaternionic CR geometry2012

    • Author(s)
      納谷信
    • Organizer
      第18回複素幾何シンポジウム
    • Place of Presentation
      信州菅平高原プチホテルゾンタック
    • Related Report
      2012 Annual Research Report
    • Invited
  • [Presentation] ポアンカレ不等式とCAT(0)空間2011

    • Author(s)
      近藤 剛史
    • Organizer
      多様体上の微分方程式
    • Place of Presentation
      金沢大学サテライトプラザ
    • Year and Date
      2011-11-12
    • Related Report
      2013 Final Research Report
  • [Presentation] Coxeter polyhedra in hyperbolic spaces2011

    • Author(s)
      井関裕靖
    • Organizer
      福岡大学微分幾何研究会
    • Place of Presentation
      福岡大学セミナーハウス
    • Year and Date
      2011-11-06
    • Related Report
      2013 Final Research Report
  • [Presentation] 有限グラフの非線形スペクトルギャップ2011

    • Author(s)
      近藤剛史
    • Organizer
      第58回幾何学シンポジウム
    • Place of Presentation
      山口大学吉田キャンパス
    • Year and Date
      2011-08-28
    • Related Report
      2013 Final Research Report
  • [Presentation] ランダム群の固定点性質2011

    • Author(s)
      井関裕靖
    • Organizer
      仙台シンポジウム
    • Place of Presentation
      東北大学情報科学研究科
    • Year and Date
      2011-08-18
    • Related Report
      2013 Final Research Report
  • [Presentation] 離散群の剛性への幾何学的アプローチ2011

    • Author(s)
      納谷信
    • Organizer
      仙台シンポジウム
    • Place of Presentation
      東北大学情報科学研究科(招待講演)
    • Year and Date
      2011-08-18
    • Related Report
      2011 Annual Research Report
  • [Presentation] CAT(0) spaces and nonlinear spectral gap2011

    • Author(s)
      近藤剛史
    • Organizer
      Long Term Workshop Geometry and Analysis
    • Place of Presentation
      京都大学
    • Year and Date
      2011-03-16
    • Related Report
      2013 Final Research Report
  • [Presentation] 距離空間のマルコフタイプ2011

    • Author(s)
      近藤剛史
    • Organizer
      淡路島幾何学研究集会2011
    • Place of Presentation
      南あわじ市松帆古津路国民宿舎慶野松原荘
    • Year and Date
      2011-02-10
    • Related Report
      2013 Final Research Report
  • [Presentation] 離散群の剛性と非正曲率空間の幾何2011

    • Author(s)
      納谷信
    • Organizer
      筑波大学数学系月例談話会
    • Place of Presentation
      筑波大学数理物質科学研究科
    • Year and Date
      2011-01-20
    • Related Report
      2010 Annual Research Report
  • [Presentation] 幾何の対象のしての群2011

    • Author(s)
      納谷信
    • Organizer
      名古屋大学数学教育セミ ナー
    • Place of Presentation
      名古屋大学
    • Related Report
      2013 Final Research Report
  • [Presentation] Deformation of polyhedra towards Margulis superrigidity2011

    • Author(s)
      納谷信
    • Organizer
      福岡大学微分幾何研究会
    • Place of Presentation
      福岡大学セミナーハウス
    • Related Report
      2013 Final Research Report 2011 Annual Research Report
  • [Presentation] 離散群の剛性への幾何学的アプローチ2011

    • Author(s)
      納谷信
    • Organizer
      仙台シンポジウム
    • Place of Presentation
      東北大学情報科学研究科
    • Related Report
      2013 Final Research Report
  • [Presentation] Quaternionic CR geometry2010

    • Author(s)
      納谷信
    • Organizer
      Workshop on Parabolic Geometry
    • Place of Presentation
      東京大学 玉原セミナーハウス
    • Year and Date
      2010-11-02
    • Related Report
      2010 Annual Research Report
  • [Presentation] 同変写像のエネルギーと有限生成群の剛性2010

    • Author(s)
      井関裕靖
    • Organizer
      福岡大学微分幾何研究会
    • Place of Presentation
      福岡大学セミナーハウス
    • Year and Date
      2010-10-09
    • Related Report
      2013 Final Research Report
  • [Presentation] 特異なCAT(0)空間2010

    • Author(s)
      近藤剛史
    • Organizer
      日本数学会2010年度秋季総合分科会
    • Place of Presentation
      名古屋大学
    • Year and Date
      2010-09-25
    • Related Report
      2013 Final Research Report
  • [Presentation] スケール極限による固定点定理2010

    • Author(s)
      近藤剛史
    • Organizer
      調和写像論の深化と展望
    • Place of Presentation
      京都大学数理解析研究所
    • Year and Date
      2010-06-03
    • Related Report
      2013 Final Research Report
  • [Presentation] 調和写像歪超剛性・固定点性質2010

    • Author(s)
      納谷信
    • Organizer
      RIMS研究集会「調和写像論の深化と展望」
    • Place of Presentation
      京都大学数理解析研究所
    • Year and Date
      2010-06-03
    • Related Report
      2010 Annual Research Report
  • [Presentation] Generalized polygonの歪み2010

    • Author(s)
      近藤剛史
    • Organizer
      日本数学会2010年度年会
    • Place of Presentation
      慶應義塾大学矢上キャンパス
    • Year and Date
      2010-03-25
    • Related Report
      2013 Final Research Report
  • [Presentation] 有限生成群のヒルベルト空間への等長作用と性質(T)2010

    • Author(s)
      近藤剛史
    • Organizer
      トロピカル幾何と超離散系の新展開
    • Place of Presentation
      京都大学
    • Year and Date
      2010-03-10
    • Related Report
      2013 Final Research Report
  • [Presentation] Random groups and scaling limit argument2010

    • Author(s)
      近藤剛史
    • Organizer
      第5回日中友好幾何学研究集会
    • Place of Presentation
      OIST (沖縄科学技術研究基盤整備機構) Seaside House
    • Year and Date
      2010-01-30
    • Related Report
      2013 Final Research Report
  • [Presentation] スケール極限を用いた離散群の固定点定理2010

    • Author(s)
      近藤剛史
    • Organizer
      確率論と幾何学
    • Place of Presentation
      京都大学
    • Year and Date
      2010-01-08
    • Related Report
      2013 Final Research Report
  • [Presentation] Quaternionic CR geometry2010

    • Author(s)
      納谷信
    • Organizer
      Workshop on Parabolic Geometry
    • Place of Presentation
      東京大学玉原セミナーハウス
    • Related Report
      2013 Final Research Report
  • [Presentation] 四元数CR幾何における可積分性2010

    • Author(s)
      納谷信
    • Organizer
      福岡大学微分幾何研究会
    • Place of Presentation
      福岡大学セミナーハウス
    • Related Report
      2013 Final Research Report 2010 Annual Research Report
  • [Presentation] 調和写像と超剛性・固定点性質2010

    • Author(s)
      納谷信
    • Organizer
      調和写像論の深化と展望
    • Place of Presentation
      京都大学数理解析研究所
    • Related Report
      2013 Final Research Report
  • [Presentation] 離散群の剛性と非正曲率空間の幾何2010

    • Author(s)
      納谷信
    • Organizer
      筑波大学数学系月例談話会
    • Place of Presentation
      筑波大学
    • Related Report
      2013 Final Research Report
  • [Presentation] CAT (0) 錐の不変量δについて2009

    • Author(s)
      納谷信
    • Organizer
      福岡大学微分幾何研究会
    • Place of Presentation
      福岡大学セミナーハウス
    • Year and Date
      2009-11-23
    • Related Report
      2009 Annual Research Report
  • [Presentation] ランダム群の固定点性質2009

    • Author(s)
      井関裕靖
    • Organizer
      岡大学微分幾何研究会
    • Place of Presentation
      福岡大学セミナーハウス
    • Year and Date
      2009-11-22
    • Related Report
      2013 Final Research Report
  • [Presentation] Isometric group action on Hilbert spaces2009

    • Author(s)
      近藤剛史
    • Organizer
      Discrete Geometry related to Groups and Dynamics
    • Place of Presentation
      愛媛大学
    • Year and Date
      2009-09-01
    • Related Report
      2013 Final Research Report
  • [Presentation] ランダム群の固定点性質2009

    • Author(s)
      井関裕靖
    • Organizer
      第56回幾何学シンポジウム
    • Place of Presentation
      佐賀大学
    • Year and Date
      2009-08-28
    • Related Report
      2013 Final Research Report
  • [Presentation] CAT(0)錐の不変量δについて2009

    • Author(s)
      納谷信
    • Organizer
      福岡大学微分幾何研究会
    • Place of Presentation
      福岡大学セミナーハウス
    • Related Report
      2013 Final Research Report

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Published: 2009-04-01   Modified: 2019-07-29  

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