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Spectral analysis of elliptic PDE system in complicated domains and application

Research Project

Project/Area Number 19K03576
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 12020:Mathematical analysis-related
Research InstitutionHokkaido University

Principal Investigator

JIMBO Shuichi  北海道大学, 理学研究院, 特任教授 (80201565)

Co-Investigator(Kenkyū-buntansha) 本多 尚文  北海道大学, 理学研究院, 教授 (00238817)
Project Period (FY) 2019-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2021: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
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ラメ方程式系 / ストークス方程式系 / スペクトル問題 / 特異領域変形 / 複雑領域 / スペクトル / 楕円型方程式系 / 弾性体 / 特異変形 / 複雑構造 / 漸近解析 / ラメ作用素 / 非有界領域における熱核 / パターン形成 / 大域構造
Outline of Research at the Start

光や物質の波動や振動の現象において, 事象を特徴付ける重要な量が, それが起こる空間や媒質の形状を本質的に反映する. 代表例では吹奏楽器では,空洞の形が励起される音程を決めるファクターとなる. 一方地震が建造物を振動させる際の異なる共鳴の効果や, 亀裂や欠陥の有無の特徴と外部入力からの影響の依存性(非破壊検査)などの解析にも関連する. 日常のこれらの物理現象のほとんどが連続体力学が扱う研究対象であり, 弾性体の方程式や流体の方程式で記述され数学的には偏微分方程式となる. 本研究では解や関連する数学量の精密な特徴付けの公式を与え, 幾何的に変形したときに影響を解析する.

Outline of Final Research Achievements

1. We studied the spectral problem of the Lame system which is a model equation of deformation or osscillation of an elastic body. I studied the case that the body has a small hole or a thin tunnel and obtained a perturbation formula of each eigenvalue. In that process of research we considered the boundary value problem of the homogeneous Lame system in a 2d annulus and got an explicit expression of the solution which takes an infinite sequence of fundamental solution basis. Subsequently we studied the 3dimensional body with a thin tunnel and obtained a similar formula.
2. Similarly to the item 1, we studied the same spectral problem for the Stokes system and obtained the corresponding results.

Academic Significance and Societal Importance of the Research Achievements

ラプラシアン等の2階楕円型作用素では同様の先行の研究結果は知られていたが, ラメの方程式系やストークスの方程式系ではこのような結果は得られていなかったので, このような物理的背景をもつ偏微分方程式の領域依存性に関する理解の深化に貢献している. また工学的あるいは物理的な背景もつ成果なので諸科学の分野の基礎を固めることにもつながっている.

Report

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

    (20 results)

All 2024 2023 2022 2021 2020 2019

All Journal Article (6 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 6 results,  Open Access: 1 results) Presentation (12 results) (of which Int'l Joint Research: 4 results,  Invited: 12 results) Book (2 results)

  • [Journal Article] Front propagation in the bistable reaction-diffusion equation on tree-like graphs2024

    • Author(s)
      Jimbo Shuichi、Morita Yoshihisa
    • Journal Title

      Journal of Differential Equations

      Volume: 384 Pages: 93-119

    • DOI

      10.1016/j.jde.2023.11.016

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Asymptotic behavior of the eigenfrequencies of a thin elastic rod with non-uniform cross-section of extremely oblate shape2022

    • Author(s)
      Jimbo Shuichi、Ushikoshi Erika、Yoshihara Hiromasa
    • Journal Title

      Calculus of Variations and Partial Differential Equations

      Volume: 62 Issue: 1 Pages: 1-30

    • DOI

      10.1007/s00526-022-02325-1

    • Related Report
      2023 Annual Research Report 2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Standing waves of reaction-diffusion equations on an unbounded graph with two vertices, SIAM J. Appl. Math.2022

    • Author(s)
      Satoru Iwasaki, Shuichi Jimbo, Yoshihisa Morita
    • Journal Title

      SIAM Journal of Applied Mathematics.

      Volume: 82 Issue: 5 Pages: 1733-1763

    • DOI

      10.1137/21m1454572

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Asymptotic behavior of entire solutions to reaction-diffusion equations in an infinite star graph2021

    • Author(s)
      Shuichi JIMBO, Yoshihisa MORITA
    • Journal Title

      Discrete and Continuous Dynamical Systems

      Volume: 41 Pages: 4013-4039

    • Related Report
      2021 Research-status Report 2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Asymptotic behavior of eigenfrequencies of a thin elastic rod with non-uniform cross-section2020

    • Author(s)
      Shuichi JIMBO, Albert RODRIGEZ MULET
    • Journal Title

      Journal of Mathematical Society of Japan

      Volume: 72 Pages: 119-154

    • Related Report
      2020 Research-status Report 2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Entire solutions to reaction-diffusion equations in multiple half-lines with a junction2019

    • Author(s)
      Jimbo Shuichi、Morita Yoshihisa
    • Journal Title

      Journal of Differential Equations

      Volume: 267 Issue: 2 Pages: 1247-1276

    • DOI

      10.1016/j.jde.2019.02.008

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Presentation] 小さな穴のある領域と楕円型作用素の固有値の摂動2024

    • Author(s)
      神保秀一
    • Organizer
      広島数理解析セミナー(HMA), 広島大学
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] Spectral asymptotics of domains with holes2024

    • Author(s)
      S. Jimbo
    • Organizer
      ICMC Summer Meeting on Differential Equation -2024 Chapter, Sao-Carlos, Brazil
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] 領域とスペクトル2024

    • Author(s)
      神保秀一
    • Organizer
      非線形現象の数値シミュレーションと解析2024
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] 単純な非有界グラフとアレンーカーン方程式2023

    • Author(s)
      神保秀一
    • Organizer
      応用解析研究会, 早稲田大学理工
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] 特異的領域変形と楕円型作用素の固有値の挙動2022

    • Author(s)
      神保秀一
    • Organizer
      第8回偏微分方程式レクチャーシリーズ, 福岡工業大学
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] メトリックグラフ上の Heat Kernel II2022

    • Author(s)
      神保秀一
    • Organizer
      非線形現象の数値シミュレーションと解析ミニ研究会,
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] A semilinear parabolic equation in a simple unbounded metric graph2022

    • Author(s)
      Shuichi JIMBO
    • Organizer
      North Eastern Symposium for Mathematical Analysis
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Semilinear parabolic equations in a simple unbounded graph2021

    • Author(s)
      Shuichi JIMBO
    • Organizer
      第17回非線型の諸問題
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] Singular deformation of domains and several spectral problems (online series lecture)2021

    • Author(s)
      Shuichi JIMBO
    • Organizer
      Mini-courses in Mathematical Analysis (Padova University)
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Y-shaped graph and time entire solutions of the Allen-Cahn equation2019

    • Author(s)
      Shuichi JIMBO
    • Organizer
      Workshop on New Trends in Variational Models, Fields Institute, Toronto Univ.
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Spectral properties of thin elastic rod - modes of bending, torsion and stretching,2019

    • Author(s)
      Shuichi JIMBO
    • Organizer
      PDE on thin domains and related topics, Tokyo Metropolitan Univ.
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Time entire solution of the Allen-Cahn equation in the star graph2019

    • Author(s)
      神保秀一
    • Organizer
      日本数学会、企画特別講演
    • Related Report
      2019 Research-status Report
    • Invited
  • [Book] 複素関数論の基礎2024

    • Author(s)
      本多尚文, 神保秀一, 梅田陽子
    • Total Pages
      154
    • Publisher
      数理工学社
    • ISBN
      9784864811071
    • Related Report
      2023 Annual Research Report
  • [Book] 多変数の微積分とベクトル解析2020

    • Author(s)
      神保秀一、久保英夫
    • Total Pages
      176
    • Publisher
      数理工学社
    • ISBN
      9784864810685
    • Related Report
      2020 Research-status Report

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Published: 2019-04-18   Modified: 2025-01-30  

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