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Geometry and topology of torus actions and combinatorics

Research Project

Project/Area Number 19K03472
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 11020:Geometry-related
Research InstitutionOsaka Metropolitan University (2022)
Osaka City University (2019-2021)

Principal Investigator

Masuda Mikiya  大阪公立大学, 大学院理学研究科, 特任教授 (00143371)

Project Period (FY) 2019-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2019: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
KeywordsToric Topology / convex polytope / torus orbit closure / flag variety / Hessenberg variety / トーリックトポロジー / トーラス軌道 / 対称群の表現 / Stanley-Stembridge予想 / 凸多面体 / 置換 / トーリック幾何 / コホモロジー剛性問題
Outline of Research at the Start

トーリックトポロジーは、トーリック幾何をトポロジーの観点から展開するということから始まったが、そこでの基本精神は、トーラス群作用を持つ空間のトポロジー、幾何、組合せ的側面を、トーラス群作用を用いて調べることである。したがって、取り扱う幾何学的対象を、トーリック多様体やそのトポロジー版であるトーラス多様体などに限る必要はないし、限るべきではない。グラスマン多様体や旗多様体およびそれらの部分多様体など、一般にトーリック多様体ではないが自然なトーラス作用をもつ重要な幾何学的対象があり、トーリック多様体との関連を睨みながら、それらの多様体の研究を進める。

Outline of Final Research Achievements

I continued joint work with Eunjeong Lee and Seonjeong Park on the geometry and topology of torus orbit closures in the flag variety and related combonatorics. In particular, we wrote a survey article on this topis as a chapter of the Handbook of Combinatorial Algebraic Geometry: Subvarieties ofthe Flag Variety. I also worked with Takashi Sato on the cohomology ring of a regular semisimple Hessenberg variety. The ultimate goal of this work is to prove a long standing Stanley-Stembridge conjecture in graph theory affirmatively.

Academic Significance and Societal Importance of the Research Achievements

旗多様体におけるトーラス軌道の閉包の研究は,1980年代にGelfand-Serganova, Kryachko らによって初められた.その後,トーラス軌道の閉包の特異性など調べられているが,トポロジーに関しては研究されていなかったように思われる.我々は,旗多様体におけるSchubert variety もっと一般に Richardson variety における一般的なトーラス軌道の閉包の幾何・トポロジーと組合せ論の関係を調べた.これは今後の研究の礎になると期待している.

Report

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

    (30 results)

All 2022 2021 2020 2019 2018 Other

All Int'l Joint Research (3 results) Journal Article (11 results) (of which Int'l Joint Research: 8 results,  Peer Reviewed: 11 results,  Open Access: 3 results) Presentation (14 results) (of which Int'l Joint Research: 9 results,  Invited: 12 results) Funded Workshop (2 results)

  • [Int'l Joint Research] IBS-CGP/KAIST(韓国)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] McMaster 大学(カナダ)

    • Related Report
      2019 Research-status Report
  • [Int'l Joint Research] IBS-CGP/KAIST/KIAS(韓国)

    • Related Report
      2019 Research-status Report
  • [Journal Article] The second cohomology of regular semisimple Hessenberg varieties from GKM theory2022

    • Author(s)
      Anton Ayzenberg, Mikiya Masuda, and Takashi Sato
    • Journal Title

      Proc. of the Steklov Institute of Math.

      Volume: 317 Pages: 5-27

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Unicellular LLT polynomials and twins of regular semisimple Hessenberg varieties2022

    • Author(s)
      Mikiya Masuda and Takashi Sato
    • Journal Title

      International Mathmetics Research Notice

      Volume: - Issue: 2 Pages: 964-996

    • DOI

      10.1093/imrn/rnac359

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Cohomological rigidity for toric Fano manifolds of small dimensions or large Picard numbers2022

    • Author(s)
      Akihiro Higashitani, Kazuki Kurimoto, Mikiya Masuda
    • Journal Title

      Osaka J. Math.

      Volume: 59 Pages: 177-225

    • NAID

      120007191912

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Torus orbit closures in flag varieties and retractions on Weyl groups2022

    • Author(s)
      Eunjeong Lee, Mikiya Masuda, and Seonjeong Park
    • Journal Title

      Inter. J. Math.

      Volume: 33 Issue: 04 Pages: 2250028-121

    • DOI

      10.1142/s0129167x22500288

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] On Schubert varieties of complexity one2021

    • Author(s)
      Eunjeong Lee, Mikiya Masuda, and Seonjeong Park
    • Journal Title

      Pacific J. Math.

      Volume: 315 Issue: 2 Pages: 419-447

    • DOI

      10.2140/pjm.2021.315.419

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] On descriptions of products of simplices2021

    • Author(s)
      L. Yu and M. Masuda
    • Journal Title

      Chinese Ann. Math. Ser. B

      Volume: 42 Issue: 5 Pages: 777-790

    • DOI

      10.1007/s11401-021-0290-5

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Toric Bruhat interval polytopes2021

    • Author(s)
      Eunjeong Lee, Mikiya Masuda, and Seonjeong Park
    • Journal Title

      Journal of Combinatorial Theory, Series A

      Volume: 19 Issue: 02 Pages: 1-30

    • DOI

      10.1016/j.jcta.2020.105387

    • URL

      https://ocu-omu.repo.nii.ac.jp/records/2016872

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] GENERIC TORUS ORBIT CLOSURES IN SCHUBERT VARIETIES2020

    • Author(s)
      Eunjeong Lee and Mikiya Masuda
    • Journal Title

      Journal of Combinatorial Theory, Series A

      Volume: 18 Issue: 03 Pages: 1-34

    • DOI

      10.1016/j.jcta.2019.105143

    • URL

      https://ocu-omu.repo.nii.ac.jp/records/2016866

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] HESSENBERG VARIETIES AND HYPERPLANE ARRANGEMENTS2019

    • Author(s)
      Takuro Abe, Tatsuya Horiguchi, Mikiya Masuda, Satoshi Murai and Takashi Sato
    • Journal Title

      Journal fur die Reine und Angewandte Mathematik

      Volume: 16 Issue: 09 Pages: 1-45

    • DOI

      10.1515/crelle-2018-0039

    • URL

      https://ocu-omu.repo.nii.ac.jp/records/2016849

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] THE VOLUME POLYNOMIAL OF REGULAR SEMISIMPLE HESSENBERG VARIETIES AND THE GELFAND-ZETLIN POLYTOPE2019

    • Author(s)
      M. Harada, T. Horiguchi, M. Masuda, and S. Park
    • Journal Title

      Proceedings of the Steklov Institute of Mathematics

      Volume: 18 Issue: 06 Pages: 1-27

    • DOI

      10.1134/s0081543819030192

    • URL

      https://ocu-omu.repo.nii.ac.jp/records/2016869

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] CLASSIFICATION OF TORIC MANIFOLDS OVER AN n-CUBE WITH ONE VERTEX CUT2018

    • Author(s)
      Sho Hasui、Hideya Kuwata、Mikiya Masuda、Seonjeong Park
    • Journal Title

      International Mathematics Research Notices

      Volume: 17 Issue: 05 Pages: 1-37

    • DOI

      10.1093/imrn/rny161

    • URL

      https://ocu-omu.repo.nii.ac.jp/records/2016859

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] ヘッセンバーグ多様体とStanley-Stembridge予想2022

    • Author(s)
      枡田幹也
    • Organizer
      代数的位相幾何学の軌跡と展望,~山崎正之先生退職祝賀研究集会~
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] Smooth toric Richardson varieties of Catalan type and Wedderburn-Etherington numbers2021

    • Author(s)
      枡田幹也
    • Organizer
      数理解析研究所 New developments of transformation groups
    • Related Report
      2021 Research-status Report
  • [Presentation] Regular semisimple Hessenberg varieties whose cohomology rings are generated by degree two elements2021

    • Author(s)
      Mikiya Masuda
    • Organizer
      Special session on Toric Topology at the KMS meeting
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Hessenberg varieties and the Stanley-Stembridge conjecture in graph theory2021

    • Author(s)
      Mikiya Masuda
    • Organizer
      International School, Toric Topology and Combinatorics,Sochi
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Some relations between topology and combinatorics2020

    • Author(s)
      Mikiya Masuda
    • Organizer
      Autumn online school, Applications of topology and geometry
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] トーリックトポロジーにおけるコホモロジー剛性問題2020

    • Author(s)
      枡田幹也
    • Organizer
      日本数学会
    • Related Report
      2020 Research-status Report
    • Invited
  • [Presentation] Invariants of the cohomology rings of the permutohedral varieties2020

    • Author(s)
      Mikiya Masuda
    • Organizer
      Topology and Geometry of Group Actions
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Invariants of the cohomology rings of the permutohedral varieties2020

    • Author(s)
      Mikiya Masuda
    • Organizer
      kpa70, Conference celebrating the 70th birthday of Prof. Krzysztof Pawałowski
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Quotients of toric orbifolds by reflactions2020

    • Author(s)
      Mikiya Masuda
    • Organizer
      Polyhedral Products Seminar
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Unique toric structures on Fano Bott manifolds2020

    • Author(s)
      Mikiya Masuda
    • Organizer
      kpa70+, Transformation Group Theory
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Torus orbit closures in the flag varieties2019

    • Author(s)
      Mikiya Masuda
    • Organizer
      Topology, Geometry, and Dynamics: Rokhlin-100
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 旗多様体のトーラス軌道の閉包とワイル群上の距離2019

    • Author(s)
      枡田幹也
    • Organizer
      変換群とその応用、数理解析研究所
    • Related Report
      2019 Research-status Report
  • [Presentation] 群作用と多面体 -トーリックトポロジーの観点からー2019

    • Author(s)
      枡田幹也
    • Organizer
      トポロジーシンポジウム
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] Torus orbit closures in the flag varieties2019

    • Author(s)
      枡田幹也
    • Organizer
      第46回変換群論シンポジウム
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Funded Workshop] Toric Topology 2021 in Osaka2021

    • Related Report
      2020 Research-status Report
  • [Funded Workshop] Toric Topology 2019 in Okayama2019

    • Related Report
      2019 Research-status Report

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Published: 2019-04-18   Modified: 2024-01-30  

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