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On collapsing of Alexandrov spaces and geometry of metric currents

Research Project

Project/Area Number 15K17529
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Geometry
Research InstitutionFukuoka University (2017-2018)
Gakushuin University (2016)
Tohoku University (2015)

Principal Investigator

Mitsuishi Ayato  福岡大学, 理学部, 助教 (80625616)

Project Period (FY) 2015-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2018: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2017: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2016: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2015: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Keywordsアレクサンドロフ空間 / グロモフ・ハウスドルフ収束 / 崩壊理論 / 距離カレント / 崩壊 / Delzant 多面体 / 閉凸体 / リプシッツ・ホモトピー / 鈍角定数 / 良い被覆 / リプシッツ構造
Outline of Final Research Achievements

We were going to study topological/geometric structures of Alexandrov spaces via phenomena of convergence of spaces. Here, convergences are divided into two cases called collapsing and non-collapsing, which are important.
In our study, we obtained a kind of stability of Lipschitz homotopy structure of Alexandrov space in non-collapsing case, and classified the topology of collapsing 3-dimensional Alexandrov spaces with boundary. We have put the former results together in several papers. The latter is on going.

Academic Significance and Societal Importance of the Research Achievements

曲率が下に有界なリーマン多様体の構造を調べる際に, アレクサンドロフ空間という対象が自然に現れます. アレクサンドロフ空間の適切なモジュライ(空間を要素とする空間)は, グロモフ・ハウスドロフ収束の観点からコンパクトです. コンパクト性は収束列が沢山存在する事を保証します. 我々はアレクサンドロフ空間の収束現象からアレクサンドロフ空間の構造を解明する事に従事しました. 研究成果で述べた事から, アレクサンドロフ空間について, 少しずつですが, その構造を理解する事ができてきています. これらは非常に興味深く今後とも継続してやるべき研究であると考えています.

Report

(5 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • 2015 Research-status Report
  • Research Products

    (33 results)

All 2019 2018 2017 2016 2015

All Journal Article (2 results) (of which Peer Reviewed: 2 results,  Open Access: 2 results) Presentation (31 results) (of which Int'l Joint Research: 9 results,  Invited: 29 results)

  • [Journal Article] Lipschitz Homotopy Convergence of Alexandrov Spaces,2018

    • Author(s)
      Ayato Mitsuishi and Takao Yamaguchi,
    • Journal Title

      Journal of Geometric Analysis

      Volume: 1 Issue: 3 Pages: 1-1

    • DOI

      10.1007/s12220-018-0075-6

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] The coincidence of the homologies of integral currents and of integral singular chains, via cosheaves2018

    • Author(s)
      Ayato Mitsuishi,
    • Journal Title

      Mathematische Zeitschrift

      Volume: 1 Issue: 3-4 Pages: 175009-175009

    • DOI

      10.1007/s00209-018-2126-x

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] ペレルマンのモース理論に現れるファイバーの位相2019

    • Author(s)
      三石史人
    • Organizer
      測地線と関連する諸問題
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] アレクサンドロフ空間の鈍角定数と体積2018

    • Author(s)
      三石史人
    • Organizer
      横国大幾何学セミナー
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] Collapsing three-dimensional Alexandrov spaces, The 4th China-Japanese geometry conference2018

    • Author(s)
      三石史人
    • Organizer
      The 4th China-Japan Geometry Conference
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] アレクサンドロフ空間の鈍角定数と体積2018

    • Author(s)
      三石史人
    • Organizer
      測地線および関連する諸問題2018
    • Related Report
      2017 Research-status Report
    • Invited
  • [Presentation] Metric currcnts and their hoologies2018

    • Author(s)
      三石史人
    • Organizer
      Conference of Metrics and Measures
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] アレクサンドロフ空間の鈍角定数と体積2018

    • Author(s)
      三石史人, 山口孝男
    • Organizer
      日本数学会2018年度会
    • Related Report
      2017 Research-status Report
  • [Presentation] アレクサンドロフ空間の比較角と体積2017

    • Author(s)
      三石史人
    • Organizer
      福岡大学微分幾何セミナー
    • Related Report
      2017 Research-status Report
    • Invited
  • [Presentation] アレクサンドロフ空間の鈍角定数と体積2017

    • Author(s)
      三石史人
    • Organizer
      第64回幾何学シンポジウム
    • Related Report
      2017 Research-status Report
    • Invited
  • [Presentation] Lipschitz homotopy convergence of Alexandrov spaces2017

    • Author(s)
      三石史人
    • Organizer
      The third Japanese-Spanish workshop on Differential Geometry
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] アレクサンドロフ空間のリプシッツホモトピー収束2017

    • Author(s)
      三石史人
    • Organizer
      広島幾何学研究集会 2017
    • Related Report
      2017 Research-status Report
    • Invited
  • [Presentation] アレクサンドロフ空間の鈍角定数と体積2017

    • Author(s)
      三石史人
    • Organizer
      2017年度福岡大学微分幾何研究集会
    • Related Report
      2017 Research-status Report
    • Invited
  • [Presentation] Comparison angle and volume of Alexandrov spaces2017

    • Author(s)
      三石史人
    • Organizer
      2017 Chonging Workshop on Differential Geometry
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] アレクサンドロフ空間の鈍角定数と体積2017

    • Author(s)
      三石史人
    • Organizer
      北海道大学幾何学コロキウム
    • Related Report
      2017 Research-status Report
    • Invited
  • [Presentation] アレクサンドロフ空間の鈍角定数と体積2017

    • Author(s)
      三石史人
    • Organizer
      大阪大学幾何セミナー
    • Related Report
      2017 Research-status Report
    • Invited
  • [Presentation] アレクサンドロフ空間のリプシッツホモトピー収束2017

    • Author(s)
      三石史人
    • Organizer
      測地線および関連する諸問題
    • Place of Presentation
      熊本大学
    • Related Report
      2016 Research-status Report
    • Invited
  • [Presentation] Locally Lipschitz contractibility of Alexandrov spaces and its applications2016

    • Author(s)
      三石史人
    • Organizer
      Workshop on metric geometry and geometric analysis
    • Place of Presentation
      上海(中国)
    • Year and Date
      2016-02-23
    • Related Report
      2015 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] アレクサンドロフ空間の貼り合わせ2016

    • Author(s)
      三石史人
    • Organizer
      測地線及び関連する諸問題
    • Place of Presentation
      熊本大学
    • Year and Date
      2016-01-10
    • Related Report
      2015 Research-status Report
    • Invited
  • [Presentation] アレクサンドロフ空間の良い被覆とその応用2016

    • Author(s)
      三石史人
    • Organizer
      学習院・早稲田 幾何学セミナー
    • Place of Presentation
      学習院大学
    • Related Report
      2016 Research-status Report
    • Invited
  • [Presentation] アレクサンドロフ空間の良い被覆とその応用2016

    • Author(s)
      三石史人
    • Organizer
      微分幾何・トポロジーセミナー
    • Place of Presentation
      慶應義塾大学
    • Related Report
      2016 Research-status Report
    • Invited
  • [Presentation] アレクサンドロフ空間の向きと基本類とその応用2016

    • Author(s)
      三石史人
    • Organizer
      学習院大学トポロジーセミナー
    • Place of Presentation
      学習院大学
    • Related Report
      2016 Research-status Report
    • Invited
  • [Presentation] Orientabilities and fundamental classes of Alexandrov spaces and its applications2016

    • Author(s)
      三石史人
    • Organizer
      Trends in modern geometry 2016
    • Place of Presentation
      東京大学
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Orientabilities and fundamental classes of Alexandrov spaces and its applications2016

    • Author(s)
      三石史人
    • Organizer
      Geo- metric analysis on Riemannian and metric spaces
    • Place of Presentation
      京都大学数理解析研究所
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] アレクサンドロフ空間の向きと基本類とその応用2016

    • Author(s)
      三石史人
    • 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
      2016 Research-status Report
    • Invited
  • [Presentation] Local Lipschitz contractibility of Alexandrov spaces and its applications2016

    • Author(s)
      三石史人
    • Organizer
      Reflections on Global Riemannian Geometry
    • Place of Presentation
      Tennessee
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] アレクサンドロフ空間の良い被覆2015

    • Author(s)
      三石史人
    • Organizer
      広島大学 トポロジー幾何セミナー
    • Place of Presentation
      広島大学
    • Year and Date
      2015-12-22
    • Related Report
      2015 Research-status Report
    • Invited
  • [Presentation] 3 次元アレクサンドロフ空間の崩壊2015

    • Author(s)
      三石史人
    • Organizer
      広島大学理学研究科数学専攻 談話会
    • Place of Presentation
      広島大学
    • Year and Date
      2015-12-22
    • Related Report
      2015 Research-status Report
    • Invited
  • [Presentation] アレクサンドロフ空間の良い被覆2015

    • Author(s)
      三石史人
    • Organizer
      首都大学東京幾何学セミナー
    • Place of Presentation
      首都大学
    • Year and Date
      2015-10-09
    • Related Report
      2015 Research-status Report
    • Invited
  • [Presentation] 断面曲率が下に有界な空間の崩壊理論 I, II (2 講演)2015

    • Author(s)
      三石史人
    • Organizer
      幾何学阿蘇研究集会
    • Place of Presentation
      阿蘇
    • Year and Date
      2015-09-25
    • Related Report
      2015 Research-status Report
    • Invited
  • [Presentation] アレクサンドロフ空間の向きと基本類2015

    • Author(s)
      三石史人
    • Organizer
      東北大学幾何セミナー
    • Place of Presentation
      東北大学
    • Year and Date
      2015-06-30
    • Related Report
      2015 Research-status Report
    • Invited
  • [Presentation] アレクサンドロフ空間の向きと基本類2015

    • Author(s)
      三石史人
    • Organizer
      福岡大学微分幾何セミナー
    • Place of Presentation
      福岡大学
    • Year and Date
      2015-06-18
    • Related Report
      2015 Research-status Report
    • Invited
  • [Presentation] Locally Lipschitz contractibility of Alexandrov spaces and its applications2015

    • Author(s)
      三石史人
    • Organizer
      Work- shop on Analysis and Geometry in metric spaces
    • Place of Presentation
      マドリッド(スペイン)
    • Year and Date
      2015-06-02
    • Related Report
      2015 Research-status Report
    • Int'l Joint Research

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Published: 2015-04-16   Modified: 2020-03-30  

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