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2014 Fiscal Year Annual Research Report

幾何学的群論と距離埋め込みの最先端研究

Research Project

Project/Area Number 23244005
Research InstitutionKyoto University

Principal Investigator

藤原 耕二  京都大学, 理学(系)研究科(研究院), 教授 (60229078)

Co-Investigator(Kenkyū-buntansha) 小沢 登高  京都大学, 数理解析研究所, 教授 (60323466)
塩谷 隆  東北大学, 理学(系)研究科(研究院), 教授 (90235507)
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) 2011-04-01 – 2016-03-31
Keywords幾何学的群論 / 写像類群
Outline of Annual Research Achievements

幾何学的群論について総合的に研究するのが目的である。そのために、国際研究集会を組織する。

今年度は、日本数学会第7回季期研究集会を他の主催者とともに主催した:The 7th MSJ-SI. Hyperbolic Geometry and Geometric Group Theory, University of Tokyo, July 30th - August 5th, 2014. そこで、国内外からトップクラスの講演者を招き、また、国内外から200名以上の参加者を得た。また、ICMのサテライト会議に指定された。講演者は以下である:Yair Nathan Minsky (Yale University), Narutaka Ozawa (Kyoto University) , Michah Sageev (Technion-Israel Institute of Technology), Karen Vogtmann (Cornell University), Mladen Bestvina (Utah), Brian Bowditch (Warwick), Martin Bridson (Oxford), Jeffrey Brock (Brown), Kenneth Bromberg (Utah), Danny Calegari (Chicago), David Gabai (Princeton) cancelled, Daniel Groves (UIC), Yoshikata Kida (Kyoto), Sang-hyun Kim (Seoul National University), Athanase Papadopoulos (Strasbourg), Piotr Przytycki (Warsaw).

今年度の主な研究実績として、Calegari氏との共同研究で、離散群の増大度に関する斉藤恭司氏の予想を解決した。また、Bestvina-Brombergとの共同研究で、projection complexについて顕著な進捗を得た。
本年度は研究協力者を1人雇用した。

Current Status of Research Progress
Current Status of Research Progress

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

Reason

予定していたことを上回る研究進捗があった。主催した国際研究集会で大きな成功を収めた。

Strategy for Future Research Activity

研究課題については、今年度得られた成果の応用に取り組む。
今後も研究協力者を1人雇用する。

  • Research Products

    (11 results)

All 2015 2014

All Journal Article (5 results) (of which Peer Reviewed: 5 results,  Acknowledgement Compliant: 4 results) Presentation (6 results) (of which Invited: 3 results)

  • [Journal Article] Asymptotically isometric metrics on relatively hyperbolic groups and marked length spectrum.2015

    • Author(s)
      Koji Fujiwara.
    • Journal Title

      Journal of Topology and Analysis

      Volume: Vol. 7, No. 2 Pages: 345-359

    • DOI

      DOI: 10.1142/S1793525315500132

    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Constructing group actions on quasi-trees and applications to mapping class groups.2014

    • Author(s)
      Mladen Bestvina, Kenneth Bromberg, Koji Fujiwara.
    • Journal Title

      Publ. IHES

      Volume: - Pages: -

    • DOI

      DOI 10.1007/s10240-014-0067-4

    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Counting subgraphs in hyperbolic graphs with symmetry.2014

    • Author(s)
      Calegari, K. Fujiwara,
    • Journal Title

      Journal of the Mathematical Society of Japan

      Volume: - Pages: -

    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Subgroups generated by two pseudo-Anosov elements in a mapping class group. II. Uniform bound on exponents.2014

    • Author(s)
      K. Fujiwara.
    • Journal Title

      Trans. Amer. Math Soc.

      Volume: - Pages: -

    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Free Banach spaces and the approximation properties.2014

    • Author(s)
      G. Godefroy and N. Ozawa;
    • Journal Title

      Proc. Amer. Math. Soc

      Volume: 142 Pages: 1681--1687.

    • DOI

      doi:10.1090/S0002-9939-2014-11933-2

    • Peer Reviewed
  • [Presentation] Stable commutator length on mapping class groups2014

    • Author(s)
      koji fujiwara
    • Organizer
      Geometric and Combinatorial Group Theory In honor of Eliyahu Rips workshop,
    • Place of Presentation
      Hebrew U, Israel.
    • Year and Date
      2014-12-18
    • Invited
  • [Presentation] Noncommutative real algebraic geometry of Kazhdan's property (T)2014

    • Author(s)
      narutaka ozawa
    • Organizer
      Arithmetic and allied subjects on the banks of the Neva,
    • Place of Presentation
      オイラー国際数学研究所(ロシア)
    • Year and Date
      2014-11-01
  • [Presentation] Asymptotically isometric metrics on hyperbolic groups2014

    • Author(s)
      koji fujiwara
    • Organizer
      The 10th Geometry conference for the friendship between China and Japan.
    • Place of Presentation
      Fudan University, China.
    • Year and Date
      2014-09-08
    • Invited
  • [Presentation] Quasi-homomorphisms into non-commutative groups2014

    • Author(s)
      koji fujiwara
    • Organizer
      "Geometry on Groups and Spaces" ICM Satellite Conference on Geometric Group Theory & Geometric Structures, .
    • Place of Presentation
      KAIST, Daejeon, Korea
    • Year and Date
      2014-08-09
    • Invited
  • [Presentation] Elementary amenable groups are quasidiagonal2014

    • Author(s)
      narutaka ozawa
    • Organizer
      Operator Algebras and Applications (ICM Satellite Conference),
    • Place of Presentation
      清風(韓国),
    • Year and Date
      2014-08-01
  • [Presentation] Approximation Properties for Group C*-Algebras2014

    • Author(s)
      narutaka ozawa
    • Organizer
      Banach and Operator Algebras over Groups,
    • Place of Presentation
      フィールズ研究所(カナダ)
    • Year and Date
      2014-04-01

URL: 

Published: 2016-06-01  

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