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Geometry of autoequivalence groups via isometric actions on the space of stability conditions

Research Project

Project/Area Number 20K22310
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0201:Algebra, geometry, analysis, applied mathematics,and related fields
Research InstitutionOsaka University (2022)
Chuo University (2020-2021)

Principal Investigator

Kikuta Kohei  大阪大学, 大学院理学研究科, 助教 (10880073)

Project Period (FY) 2020-09-11 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
KeywordsK3曲面 / 導来圏 / 自己同値群 / 安定性条件の空間 / 等長作用 / elliptic element / parabolic element / Thurstonコンパクト化 / 圏論的エントロピー / ミラー対称性 / 安定性条件
Outline of Research at the Start

代数多様体の導来圏の自己同値関手のなす自己同値群は,シンプレクティック幾何学,表現論や数理物理などの様々な分野と関わる非常に重要な群である.
本研究の目的は,K3曲面の導来圏の安定性条件のなす距離空間への等長作用を用いて,自己同値群を幾何学的に研究することである.まず,距離空間の非正曲率的性質であるCAT(0)性を考察する.さらに固有性やココンパクト性といった自己同値群の等長作用の性質を調べ,半単純元について考察する.

Outline of Final Research Achievements

We studied autoequivalence groups of derived categories via (isometric) actions on the space of stability conditions. The main topics are as follows: Hochschild entropy, intersection number and spherical twists, constructions of rank 2 free subgroups, the center subgroups of autoequivalence groups for K3 surfaces, Thurston compactifications of the space of stability conditions for curves.

Academic Significance and Societal Importance of the Research Achievements

代数多様体の自己同値群とは群と呼ばれる数学的対象の一種であり,物理学とも深く関わる導来圏の対称性を記述する.古くから研究されてきた自己同型群を自然に含み,純粋に群論の研究対象としても興味深い.本研究では,安定性条件の空間への群作用を考察することで,自己同値群に関する理解を深めることができた.

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (16 results)

All 2023 2022 2021 Other

All Int'l Joint Research (2 results) Journal Article (6 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 3 results,  Open Access: 4 results) Presentation (8 results) (of which Int'l Joint Research: 2 results,  Invited: 8 results)

  • [Int'l Joint Research] University College London(英国)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] The University of Liverpool(英国)

    • Related Report
      2022 Annual Research Report
  • [Journal Article] Hochschild Entropy and Categorical Entropy2022

    • Author(s)
      Kohei Kikuta, Genki Ouchi
    • Journal Title

      Arnold Mathematical Journal

      Volume: - Issue: 2 Pages: 223-244

    • DOI

      10.1007/s40598-022-00210-5

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Curvature of the space of stability conditions2022

    • Author(s)
      Kikuta Kohei
    • Journal Title

      Manuscripta Mathematica

      Volume: - Issue: 3-4 Pages: 437-456

    • DOI

      10.1007/s00229-022-01389-9

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Spherical twists, relations and the center of autoequivalence groups of K3 surfaces2022

    • Author(s)
      Federico Barbacovi, Kohei Kikuta
    • Journal Title

      arXiv:2210.00228

      Volume: -

    • Related Report
      2022 Annual Research Report
    • Open Access / Int'l Joint Research
  • [Journal Article] Thurston compactifications of spaces of stability conditions on curves2022

    • Author(s)
      Kohei Kikuta, Naoki Koseki, Genki Ouchi
    • Journal Title

      arXiv:2211.08001

      Volume: -

    • Related Report
      2022 Annual Research Report
    • Open Access / Int'l Joint Research
  • [Journal Article] Spherical twists and the center of autoequivalence groups of K3 surfaces2021

    • Author(s)
      Kohei Kikuta
    • Journal Title

      arXiv:2110.14353

      Volume: -

    • Related Report
      2021 Research-status Report
    • Open Access
  • [Journal Article] Serre dimension and stability conditions2021

    • Author(s)
      Kikuta Kohei、Ouchi Genki、Takahashi Atsushi
    • Journal Title

      Mathematische Zeitschrift

      Volume: - Issue: 1-2 Pages: 997-1013

    • DOI

      10.1007/s00209-021-02718-6

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Autoequivalence groups of K3 surfaces and Mapping class groups2023

    • Author(s)
      Kohei Kikuta
    • Organizer
      The 8th KTGU Mathematics Workshop for Young Researchers
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Spherical twists and the center of autoequivalence groups of K3 surfaces2022

    • Author(s)
      Kohei Kikuta
    • Organizer
      Guest talk in Lecture “Categories and dynamical systems” at Tsinghua University
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] K3曲面の自己同値群と写像類群: 距離空間への等長作用2022

    • Author(s)
      Kohei Kikuta
    • Organizer
      第69回幾何学シンポジウム
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] K3曲面の導来圏の自己同値群2022

    • Author(s)
      Kohei Kikuta
    • Organizer
      第67回代数学シンポジウム
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Fixed points on the spaces of stability conditions and Thurston compactifications2022

    • Author(s)
      Kohei Kikuta
    • Organizer
      Workshop on Mirror symmetry and Related Topics Kyoto 2022
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Spherical twists and the center of autoequivalence groups of K3 surfaces2022

    • Author(s)
      Kohei Kikuta
    • Organizer
      大阪大学オンライン代数幾何学セミナー
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] Rank 2 free subgroups in autoequivalence groups of Calabi-Yau categories2021

    • Author(s)
      Kohei Kikuta
    • Organizer
      東京名古屋代数セミナー
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] Spherical twists and the center of autoequivalence groups of K3 surfaces2021

    • Author(s)
      Kohei Kikuta
    • Organizer
      東大京大代数幾何セミナー
    • Related Report
      2021 Research-status Report
    • Invited

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Published: 2020-09-29   Modified: 2024-01-30  

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