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Geometry of spaces with curvature bounded above or below

Research Project

Project/Area Number 18K03298
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 11020:Geometry-related
Research InstitutionTohoku University

Principal Investigator

Yokota Takumi  東北大学, 理学研究科, 准教授 (70583855)

Project Period (FY) 2018-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2022: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2021: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2020: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2019: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2018: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Keywords測度距離空間 / リーマン幾何学 / 曲率 / リーマン多様体 / 距離空間
Outline of Final Research Achievements

In this project, some theorems on metric-measure spaces which are complete separable metric spaces with Borel probability measures were proved. In particular, one of the main results is that a set of metric-measure spaces is precomapct with respect to the box distance if and only if it is bounded, that is, there exists a metric-measure space which dominates any element in the set with respect to the Lipschitz order as was sketched by M. Gromov (1999). Moreover, several propositions which will be useful in the study of the geometry of metric-measure spaces were also proved.

Academic Significance and Societal Importance of the Research Achievements

リーマン幾何学において、リーマン多様体の一般化である距離空間や測度距離空間の幾何学が活発に研究されている。これらの空間は、例えば曲率が上または下に一様に有界な多様体の列の極限空間として現れ、背理法による議論などにおいて有効であるが、距離空間や測度距離空間の幾何学自体も興味深い研究対象である。本研究で証明された定理や命題は、今後の距離空間や測度距離空間の研究において有用であると期待される。近年、測度距離空間は機械学習などの分野でも研究されており、いわゆる抽象数学に限らない今後の応用も期待される。

Report

(6 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (11 results)

All 2023 2022 2021 2020 2019 2018

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

  • [Journal Article] Boundedness of precompact sets of metric measure spaces2021

    • Author(s)
      Daisuke Kazukawa, Takumi Yokota
    • Journal Title

      Geometriae Dedicata

      Volume: 215 Issue: 1 Pages: 229-242

    • DOI

      10.1007/s10711-021-00646-7

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Stability of RCD condition under concentration topology2019

    • Author(s)
      Ryunosuke Ozawa and Takumi Yokota
    • Journal Title

      Calc. Var. Partial Differential Equations

      Volume: 58 Issue: 4

    • DOI

      10.1007/s00526-019-1586-0

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Presentation] ピラミッドの積の収束について2023

    • Author(s)
      横田巧
    • Organizer
      測地線及び関連する諸問題
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Boundedness of precompact sets of metric measure spaces2022

    • Author(s)
      横田巧
    • Organizer
      測地線及び関連する諸問題
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] 測度距離空間の射影極限とピラミッド2022

    • Author(s)
      横田巧
    • Organizer
      確率論と幾何学
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] Some observation on the geometry of metric measure spaces2021

    • Author(s)
      横田巧
    • Organizer
      測地線および関連する諸問題
    • Related Report
      2020 Research-status Report
    • Invited
  • [Presentation] 測度距離空間の幾何学とその拡張2020

    • Author(s)
      横田 巧
    • Organizer
      測地線及び関連する諸問題
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] 測度距離空間の幾何学とその拡張2019

    • Author(s)
      横田 巧
    • Organizer
      幾何学シンポジウム
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] RCD空間の集中とスペクトル収束2019

    • Author(s)
      横田巧
    • Organizer
      測地線及び関連する諸問題
    • Related Report
      2018 Research-status Report
    • Invited
  • [Presentation] Stability of RCD condition under concentration topology2018

    • Author(s)
      Takumi Yokota
    • Organizer
      The 4th China-Japan Geometry Conference
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Barycenter of probability measures on CAT(1)-spaces of small radii2018

    • Author(s)
      Takumi Yokota
    • Organizer
      Workshop on barycenters, convexity on metric spaces and positive operators
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited

URL: 

Published: 2018-04-23   Modified: 2024-01-30  

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