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Wave equations with variable propagation speed and its application for the global solvability of Kirchhoff equation

Research Project

Project/Area Number 18K03372
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 InstitutionYamaguchi University

Principal Investigator

Hirosawa Fumihiko  山口大学, 大学院創成科学研究科, 教授 (50364732)

Project Period (FY) 2018-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2022: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2021: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2020: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2019: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2018: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Keywordsキルヒホフ方程式 / 波動方程式 / 半離散 / 変数係数 / エネルギー評価 / クライン・ゴルドン型方程式 / 半離散波動方程式 / キルヒホッフ方程式 / クラインゴルドン方程式 / 離散 / クライン・ゴルドン方程式 / 双曲型方程式 / 非線形
Outline of Final Research Achievements

The main results in this project concern the following three problems related to the global solvability of Kirchhoff-type nonlinear wave equations and the asymptotic stability of initial values of wave equations with variable coefficients: (i) Energy estimates of semi-discrete wave equations with time dependent coefficients; (ii) Energy estimates of Klein-Gordon type equations with time-dependent mass term; (iii) Global solvability of semi-discrete Kirchhoff type equations. All of the research results were obtained by applying Fourier analysis to equations in which there are additional time-dependent effects on the ordinary wave equation, and furthermore, these effects cannot essentially be regarded as perturbations, and by performing original precise analyses in time-frequency space.

Academic Significance and Societal Importance of the Research Achievements

キルヒホフ方程式の大域可解性は偏微分方程式の分野における重要な未解決問題である。また、時間に依存する係数をもつ線形波動方程式の解析は、キルヒホフ方程式への応用だけでなく、外部から時間に依存した影響を受ける現象の安定性の問題においても重要である。本研究の成果(投稿中を含む)は、応用面ではより現実的な空間変数を離散化した半離散キルヒホフ方程式の導入とその大域可解性の証明、その線形化モデルである変数係数半離散波動方程式および時間に依存する質量係数がクリティカルな影響を及ぼす可能性があるクライン・ゴルドン型方程式のエネルギーの安定性が成り立つための十分条件を、新たな視点から与えたことである。

Report

(7 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
  • 2018 Research-status Report
  • Research Products

    (25 results)

All 2024 2023 2022 2021 2020 2019 2018

All Journal Article (3 results) (of which Peer Reviewed: 3 results) Presentation (22 results) (of which Int'l Joint Research: 5 results,  Invited: 3 results)

  • [Journal Article] On the Wave-Like Energy Estimates of Klein-Gordon Type Equations with Time Dependent Potential2023

    • Author(s)
      Kazunori Goto, Fumihiko Hirosawa
    • Journal Title

      Trends in Mathematics

      Volume: 1 Pages: 635-646

    • DOI

      10.1007/978-3-031-36375-7_48

    • ISBN
      9783031363740, 9783031363757
    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] On the energy estimates of semi-discrete wave equations with time dependent propagation speed2021

    • Author(s)
      Fumihiko Hirosawa
    • Journal Title

      Journal of Mathematical Analysis and Applications

      Volume: 496 Issue: 1 Pages: 124798-124798

    • DOI

      10.1016/j.jmaa.2020.124798

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] On The Energy Estimate for Klein-Gordon Type Equations with Time Dependent Singular Mass2019

    • Author(s)
      Fumihiko Hirosawa
    • Journal Title

      Analysis, Probability, Applications, and Computation: Proceedings of the 11th ISAAC Congress (Sweden) 2017

      Volume: -

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Presentation] 変数係数波動方程式と半離散波動方程式の初期値問題2024

    • Author(s)
      廣澤史彦
    • Organizer
      第39回 松山キャンプ
    • Related Report
      2023 Annual Research Report
  • [Presentation] Global solvability for semi-discrete Kirchhoff equation2023

    • Author(s)
      Fumihiko Hirosawa
    • Organizer
      14th International ISAAC Congress
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Remarks on the oscillation frequency of time dependent coefficient for the energy estimates of wave equations2023

    • Author(s)
      廣澤史彦
    • Organizer
      松本偏微分方程式研究集会
    • Related Report
      2023 Annual Research Report
  • [Presentation] On the wave-like energy estimates of Klein-Gordon type equations with time dependent potential2023

    • Author(s)
      五島和徳
    • Organizer
      第38回 松山キャンプ
    • Related Report
      2022 Research-status Report
  • [Presentation] Kirchhoff 型半離散波動方程式の大域可解性について2023

    • Author(s)
      廣澤史彦
    • Organizer
      第38回 松山キャンプ
    • Related Report
      2022 Research-status Report
  • [Presentation] On the wave-like energy estimates of Klein-Gordon type equations with time dependent potential2022

    • Author(s)
      五島和徳
    • Organizer
      駿河台偏微分方程式研究集会
    • Related Report
      2022 Research-status Report
  • [Presentation] 半離散型キルヒホフ方程式の大域可解性2022

    • Author(s)
      廣澤史彦
    • Organizer
      駿河台偏微分方程式研究集会
    • Related Report
      2022 Research-status Report
  • [Presentation] Kirchhoff 型半離散波動方程式の大域可解性2022

    • Author(s)
      廣澤史彦
    • Organizer
      第37回 松山キャンプ
    • Related Report
      2021 Research-status Report
  • [Presentation] 変数係数波動方程式・半離散波動方程式のエネルギー評価2022

    • Author(s)
      廣澤史彦
    • Organizer
      Saga Workshop on Partial Differential Equations
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] On the energy estimates of semi-discrete wave equations with time dependent propagation speed2021

    • Author(s)
      Fumihiko Hirosawa
    • Organizer
      13th ISAAC Congress
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] 伝播速度が時間に依存する半離散波動程式のエネルギー評価2021

    • Author(s)
      廣澤史彦
    • Organizer
      半田山偏微分方程式研究集会
    • Related Report
      2021 Research-status Report
  • [Presentation] 時間に依存するポテンシャル項を持つクライン・ゴルドン型 方程式のエネルギー評価2021

    • Author(s)
      廣澤史彦
    • Organizer
      2021 年度 RIMS 共同研究(グループ型)時間依存するハミルトニアンに対する散乱理論 および超局所解析の新展開
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] On the energy estimates of semi-discrete wave equations with time dependent propagation speed2021

    • Author(s)
      廣澤史彦
    • Organizer
      第36回 松山キャンプ
    • Related Report
      2020 Research-status Report
  • [Presentation] 変数係数離散型波動方程式のエネルギー評価2020

    • Author(s)
      廣澤史彦
    • Organizer
      第35回 松山キャンプ
    • Related Report
      2019 Research-status Report
  • [Presentation] Energy estimates for Klein-Gordon type equations with time dependent mass2019

    • Author(s)
      F. Hirosawa
    • Organizer
      12th International ISAAC Congress
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Some properties of time dependent propagation speed of the wave equation for the estimates of low frequency energy2019

    • Author(s)
      F. Hirosawa
    • Organizer
      12th International ISAAC Congress
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Recent progress on the wave equations with time dependent propagation speed2019

    • Author(s)
      F. Hirosawa
    • Organizer
      Anomalies in Partial Differential Equations
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] 変数係数波動方程式の低周波領域における評価とその応用2019

    • Author(s)
      廣澤史彦
    • Organizer
      第34回松山キャンプ
    • Related Report
      2018 Research-status Report
  • [Presentation] On the energy estimate for Klein-Gordon type equations with time dependent singular mass2018

    • Author(s)
      廣澤史彦
    • Organizer
      熊本大学応用解析セミナー
    • Related Report
      2018 Research-status Report
    • Invited
  • [Presentation] On the energy estimate for Klein-Gordon type equations with time dependent singular mass2018

    • Author(s)
      廣澤史彦
    • Organizer
      日本数学会秋季総合分科会
    • Related Report
      2018 Research-status Report
  • [Presentation] On the energy estimate for Klein-Gordon type equations with time dependent singular mass2018

    • Author(s)
      廣澤史彦
    • Organizer
      名古屋偏微分方程式研究集会
    • Related Report
      2018 Research-status Report
  • [Presentation] 変数係数波動方程式の低周波領域における評価とその応用2018

    • Author(s)
      廣澤史彦
    • Organizer
      第25回超局所解析と古典解析
    • Related Report
      2018 Research-status Report

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Published: 2018-04-23   Modified: 2025-01-30  

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