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Algebraic, geometric, and analytic studies on irregular singularity and their applicaitions

Research Project

Project/Area Number 17K14222
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Mathematical analysis
Research InstitutionChiba University (2019-2020)
Josai University (2017-2018)

Principal Investigator

Hiroe Kazuki  千葉大学, 大学院理学研究院, 准教授 (50648300)

Project Period (FY) 2017-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
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)
Fiscal Year 2017: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Keywords不確定特異点 / 有理型接続のモジュライ空間 / 箙多様体 / オイラー変換 / 特異点の合流理論 / モジュライ空間 / シンプレクティック幾何学 / 複素多様体の変形理論 / 接続のモジュライ / 箙の表現 / 特異点の合流 / ルート系 / リジッド指数 / 結び目 / 解析学 / 関数方程式論 / 幾何学 / 代数学 / 数理物理
Outline of Final Research Achievements

I found a formula which connects Komatsu-Malgrange irregularity of differential equations and Milnor number of corresponding plane curve singularities. Moreover, I studied the local Laplace transform of differential equations and determined
isomorphism classes of knots arising from the analytic continuation of these Laplace kernels. By using this formula, I showed that
the Euler characteristics of spectral curves of differential equations coincide with Katz' indices of rigidity of corresponding differential equations.

Academic Significance and Societal Importance of the Research Achievements

不確定特異点の解析学は一般的に難しいが,この研究よって微分方程式に対応する代数曲線の不変量が微分方程式の不確定特異点の様子を非常によくとらえていることが明らかになった.これによって代数曲線における代数幾何学的な研究手法が微分方程式論へ応用できることが期待され,微分方程式論に新しい研究手法を与えることになる.

Report

(5 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (10 results)

All 2021 2020 2019 2018 2017

All Journal Article (3 results) Presentation (6 results) (of which Int'l Joint Research: 2 results,  Invited: 2 results) Book (1 results)

  • [Journal Article] Index of rigidity of differential equations and Euler characteristic of their spectral curves2021

    • Author(s)
      Kazuki Hiroe
    • Journal Title

      Journal of Geometry and Physics

      Volume: 162 Pages: 104060-104060

    • DOI

      10.1016/j.geomphys.2020.104060

    • Related Report
      2020 Annual Research Report
  • [Journal Article] On Oshima's conjecture2020

    • Author(s)
      Kazuki Hiroe
    • Journal Title

      Josai Mathematical Monographs

      Volume: 12

    • Related Report
      2019 Research-status Report
  • [Journal Article] Euler characteristics of differential equations and spectral curves2020

    • Author(s)
      Kazuki Hiroe
    • Journal Title

      京都大学数理解析研究所講究録

      Volume: -

    • Related Report
      2019 Research-status Report
  • [Presentation] 不分岐不確定特異点のunfoldingと射影直線上の有理型接続のモジュライの変形2020

    • Author(s)
      Kazuki Hiroe
    • Organizer
      ミラー対称性の諸相 2020
    • Related Report
      2020 Annual Research Report
  • [Presentation] Confluence of singular points of Fuchsian equations and deformation of star-shaped quiver varieties2019

    • Author(s)
      Kazuki Hiroe
    • Organizer
      Moduli spaces, Representation theory and Quantization
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Ramified irregular singularities of differential equations and their spectral curves2018

    • Author(s)
      廣惠一希
    • Organizer
      代数解析学の諸問題 ― 超局所解析及び漸近解析 ―
    • Related Report
      2018 Research-status Report
  • [Presentation] 大島予想について2018

    • Author(s)
      廣惠一希
    • Organizer
      微分方程式と表現論
    • Related Report
      2018 Research-status Report
  • [Presentation] Fuchs型方程式の特異点の合流とアクセサリーパラメーターの空間について2018

    • Author(s)
      廣惠一希
    • Organizer
      アクセサリーパラメーター研究会
    • Related Report
      2018 Research-status Report
  • [Presentation] Invariants of differential equations and algebraic curves2017

    • Author(s)
      廣惠一希
    • Organizer
      Differential Geometry and Differential Equations:the influence of Mirror Symmetry and Physics
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research / Invited
  • [Book] 4-dimensional Painleve-type equations2018

    • Author(s)
      Kazuki Hiroe, Hiroshi Kawakami, Akane Nakamura, Hidetaka Sakai
    • Total Pages
      172
    • Publisher
      The Mathematical Society of Japan
    • ISBN
      9784864970877
    • Related Report
      2018 Research-status Report

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Published: 2017-04-28   Modified: 2022-01-27  

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