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Schubert calculus on Hessenberg varieties

Research Project

Project/Area Number 19K14508
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 11010:Algebra-related
Research InstitutionUbe National College of Technology (2022-2024)
Osaka City University (2020-2021)
Osaka University (2019)

Principal Investigator

Horiguchi Tatsuya  宇部工業高等専門学校, 一般科, 准教授 (60780757)

Project Period (FY) 2019-04-01 – 2025-03-31
Project Status Completed (Fiscal Year 2024)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2022: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2020: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2019: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Keywordsヘッセンバーグ多様体 / 旗多様体 / シューベルトカルキュラス / トーリック多様体 / 量子コホモロジー / 対称群 / gamma vector / permutohedron / 対称群の表現 / Peterson多様体 / Schubert多様体 / Richardson多様体 / Schubert calculus / toric orbifold / mixed Eulerian number
Outline of Research at the Start

旗多様体上のシューベルトカルキュラスは,旗多様体の部分多様体であるシューベルト多様体たちの交叉数を計算することが目的である.本研究では,旗多様体上のシューベルトカルキュラスを,正則な冪零ヘッセンバーグ多様体の上に一般化することを目的としている.
旗多様体上のシューベルトカルキュラスにおいて,シューベルト多項式と呼ばれる多項式を導入することで,シューベルト多様体たちの交叉数の計算を行っている.本研究では,正則な冪零ヘッセンバーグ多様体とシューベルトセルとの共通部分で空集合でないものの閉包が定めるサイクルのポアンカレ双対がどのような多項式で記述できるかについて研究する.

Outline of Final Research Achievements

We studied Hessenberg varieties.(1)We constructed a monomial basis for the cohomology of regular nilpotent Hessenberg varieties.(2)We worked on Schubert calculus on Peterson varieties and we connected this with mixed Eulerian numbers.(3)We showed that the cohomology ring of some regular Hessenberg varieties is isomorphic to the cohomology ring of certain toric orbifolds. We also gave an explicit formula for the gamma vectors of the toric orbifolds.(4)We studied the cohomology ring for the intersection of Peterson varieties and some Richardson varieties.(5)We studied the coordinate ring of the intersection of regular nilpotent Hessenberg varieties and the opposite Schubert cell associated to the identity element.

Academic Significance and Societal Importance of the Research Achievements

(1)旗多様体のコホモロジーの単項式基底はシューベルト多項式に現れる単項式のため,正則冪零ヘッセンバーグ多様体における単項式基底の構成は大事と思う.(2)ピーターソン多様体上のシューベルトカルキュラスがmixed Eulerian numberと関連づけたのは面白い結果と思う.(3)正則ヘッセンバーグ多様体とtoric orbifoldのコホモロジー環を結び付けたのは新しい知見である.(4)ピーターソン多様体と一般のリチャードソン多様体の交わりのコホモロジー環を調べる手掛かりとなることを期待する.(5)旗多様体の量子コホモロジー環の明示的表示を一般化した形で座標環を与えたのは新たな発見と思う.

Report

(7 results)
  • 2024 Annual Research Report   Final Research Report ( PDF )
  • 2023 Research-status Report
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (25 results)

All 2025 2024 2023 2022 2021 2020 2019

All Journal Article (8 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 8 results,  Open Access: 2 results) Presentation (17 results) (of which Int'l Joint Research: 4 results,  Invited: 13 results)

  • [Journal Article] Coordinate rings of regular nilpotent Hessenberg varieties in the open opposite schubert cell2025

    • Author(s)
      Horiguchi Tatsuya、Shirato Tomoaki
    • Journal Title

      Forum of Mathematics, Sigma

      Volume: 13

    • DOI

      10.1017/fms.2024.142

    • Related Report
      2024 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Toric orbifolds associated with partitioned weight polytopes in classical types2024

    • Author(s)
      Horiguchi Tatsuya、Masuda Mikiya、Shareshian John、Song Jongbaek
    • Journal Title

      Selecta Mathematica

      Volume: 30 Issue: 5

    • DOI

      10.1007/s00029-024-00977-9

    • Related Report
      2024 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Toward cohomology rings of intersections of Peterson varieties and Richardson varieties2024

    • Author(s)
      Horiguchi Tatsuya
    • Journal Title

      Journal of Algebra

      Volume: 647 Pages: 277-311

    • DOI

      10.1016/j.jalgebra.2024.01.046

    • Related Report
      2023 Research-status Report
    • Peer Reviewed
  • [Journal Article] Geometry of Peterson Schubert calculus in type A and left-right diagrams2024

    • Author(s)
      Abe Hiraku、Horiguchi Tatsuya、Kuwata Hideya、Zeng Haozhi
    • Journal Title

      Algebraic Combinatorics

      Volume: 7 Issue: 2 Pages: 383-412

    • DOI

      10.5802/alco.342

    • Related Report
      2023 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Mixed Eulerian Numbers and Peterson Schubert Calculus2023

    • Author(s)
      Horiguchi Tatsuya
    • Journal Title

      International Mathematics Research Notices

      Volume: - Issue: 2 Pages: 1422-1471

    • DOI

      10.1093/imrn/rnad030

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] AN ADDITIVE BASIS FOR THE COHOMOLOGY RINGS OF REGULAR NILPOTENT HESSENBERG VARIETIES2022

    • Author(s)
      ENOKIZONO MAKOTO、HORIGUCHI TATSUYA、NAGAOKA TAKAHIRO、TSUCHIYA AKIYOSHI
    • Journal Title

      Transformation Groups

      Volume: - Issue: 2 Pages: 695-732

    • DOI

      10.1007/s00031-022-09763-3

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] A filtration on the cohomology rings of regular nilpotent Hessenberg varieties2021

    • Author(s)
      Harada Megumi、Horiguchi Tatsuya、Murai Satoshi、Precup Martha、Tymoczko Julianna
    • Journal Title

      Mathematische Zeitschrift

      Volume: 298 Pages: 1345-1382

    • DOI

      10.1007/s00209-020-02646-x

    • Related Report
      2021 Research-status Report 2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] A survey of recent developments on Hessenberg varieties2019

    • Author(s)
      Hiraku Abe and Tatsuya Horiguchi
    • Journal Title

      the Proceedings volume of the conference in Schubert Calculus, Guangzhou, November 2017

      Volume: 印刷中

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Presentation] Coordinate ring of the intersection of a regular nilpotent Hessenberg variety with the opposite Schubert cell associated with the identity element2024

    • Author(s)
      堀口達也
    • Organizer
      東工大表現論セミナー
    • Related Report
      2024 Annual Research Report
    • Invited
  • [Presentation] permutohedral variety の gamma vector の対称群の表現版2023

    • Author(s)
      堀口 達也
    • Organizer
      第5回ヘッセンバーグ勉強会2023
    • Related Report
      2023 Research-status Report
  • [Presentation] Petersonの主張の量子化2023

    • Author(s)
      堀口 達也
    • Organizer
      鹿児島勉強会
    • Related Report
      2022 Research-status Report
  • [Presentation] Mixed Eulerian numbers and Peterson Schubert calculus2022

    • Author(s)
      堀口 達也
    • Organizer
      RIMS共同研究: 変換群論の新潮流
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] Peterson多様体と巡回群2022

    • Author(s)
      堀口 達也
    • Organizer
      第4回ヘッセンバーグ勉強会2022
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] 正則冪零ヘッセンバーグ多様体と単位元に付随する opposite Schubert cell との交わりの座標環2022

    • Author(s)
      堀口 達也
    • Organizer
      第48回変換群論シンポジウム
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] Peterson Schubert calculusとmixed Eulerian numberとの関係2022

    • Author(s)
      堀口 達也
    • Organizer
      京大・九大・信州大合同トポロジーセミナー
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] Peterson多様体上のSchubert calculus2022

    • Author(s)
      堀口 達也
    • Organizer
      大阪市立大学 談話会
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] Intersections of Peterson variety and Schubert varieties, and hyperplane arrangements2022

    • Author(s)
      堀口 達也
    • Organizer
      第3回ヘッセンバーグ勉強会2022
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] Mixed Eulerian numbers and Peterson Schubert calculus2021

    • Author(s)
      堀口 達也
    • Organizer
      ヘッセンバーグ勉強会2021
    • Related Report
      2021 Research-status Report
  • [Presentation] Peterson多様体とSchubert多様体の交わりについて2021

    • Author(s)
      堀口 達也
    • Organizer
      第2回ヘッセンバーグ勉強会2021
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] Hessenberg varieties and toric orbifolds2021

    • Author(s)
      堀口 達也
    • Organizer
      Toric Topology 2021 in Osaka
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Hessenberg多様体に纏わる話題2020

    • Author(s)
      堀口 達也
    • Organizer
      大阪市立大学 談話会
    • Related Report
      2020 Research-status Report
    • Invited
  • [Presentation] Topics on Hessenberg varieties2020

    • Author(s)
      堀口 達也
    • Organizer
      International seminar for young researchers "Algebraic, combinatorial and toric topology"
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] A monomial basis for the cohomology rings of regular nilpotent Hessenberg varieties2020

    • Author(s)
      堀口 達也
    • Organizer
      2019-2020 Geometric Representation Theory Seminar
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] A monomial basis for the cohomology rings of regular nilpotent Hessenberg varieties2019

    • Author(s)
      堀口 達也
    • Organizer
      Toric Topology 2019 in Okayama
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 正則な冪零ヘッセンバーグ多様体のコホモロジーのフィルトレーション2019

    • Author(s)
      堀口 達也
    • Organizer
      微分空間・トポロジーと組み合わせ構造
    • Related Report
      2019 Research-status Report

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Published: 2019-04-18   Modified: 2026-01-16  

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