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Behavior of solutions for various nonlinear diffusion equations

Research Project

Project/Area Number 15K17573
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Mathematical analysis
Research InstitutionShizuoka University

Principal Investigator

Fujishima Yohei  静岡大学, 工学部, 准教授 (70632628)

Research Collaborator IOKU Norisuke  
Project Period (FY) 2015-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2018: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2017: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2015: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Keywords非線形熱方程式 / 自己相似性 / 準スケール変換 / 可解性 / 前方自己相似解 / 特異性 / 藤田指数 / 非線形拡散方程式 / 解の局所存在・非存在 / 時間大域解 / 漸近挙動 / 熱方程式 / 非線形問題 / 拡散現象 / 解の存在 / 解の特異性 / 有限時間爆発 / 拡散方程式 / 非線形現象 / 爆発問題 / 解の存在・非存在
Outline of Final Research Achievements

We consider a nonlinear heat equation, which is an example of reaction-diffusion equations, and studied the solvability of the initial-value problem. In particular, we treated a nonlinear term which we do not assume a specific form, and derived the optimal integrability of initial function for the local in time existence of solutions. Furthermore, we also considered the heat equation with exponential nonlinearity, and obtained the optimal decay rate of initial function for global in time existence of solutions.

Academic Significance and Societal Importance of the Research Achievements

本研究では、自己相似性と呼ばれる数学的構造が存在しない非線形熱方程式を扱い、その可解性を考察した。本研究で用いた議論は、自己相似変換と呼ばれる自己相似性に基づく変換を一般化することで行われた。この一般化により、既存の研究では扱うことが難しい、自己相似性を持たない方程式に対しても可解性を考察することが可能となり、解析対象が大幅に広がった。可解性に限らず、解の挙動など、これまでの自己相似性に基づく様々な議論を一般化することができる可能性があり、今後の研究の進展が期待される。

Report

(5 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • 2015 Research-status Report
  • Research Products

    (17 results)

All 2019 2018 2017 2016 2015 Other

All Int'l Joint Research (2 results) Journal Article (7 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 7 results,  Open Access: 1 results) Presentation (7 results) (of which Int'l Joint Research: 3 results,  Invited: 6 results) Remarks (1 results)

  • [Int'l Joint Research] Friedrich-Alexander University(ドイツ)

    • Related Report
      2017 Research-status Report
  • [Int'l Joint Research] Friedrich-Alexander University(ドイツ)

    • Related Report
      2016 Research-status Report
  • [Journal Article] Existence and nonexistence of solutions for the heat equation with a superlinear source term2018

    • Author(s)
      Yohei Fujishima and Norisuke Ioku
    • Journal Title

      J. Math. Pures Appl. (9)

      Volume: 118 Pages: 128-158

    • DOI

      10.1016/j.matpur.2018.08.001

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Global existence and blow-up of solutions for the heat equation with exponential nonlinearity2018

    • Author(s)
      Fujishima Yohei
    • Journal Title

      Journal of Differential Equations

      Volume: 264 Issue: 11 Pages: 6809-6842

    • DOI

      10.1016/j.jde.2018.01.048

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] A fairly strong stability result for parabolic quasiminimizers2018

    • Author(s)
      Fujishima Yohei、Habermann Jens、Masson Mathias
    • Journal Title

      Mathematische Nachrichten

      Volume: 291 Issue: 8-9 Pages: 1269-1282

    • DOI

      10.1002/mana.201700018

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Stability for parabolic quasi minimizers in metric measure spaces2018

    • Author(s)
      Fujishima Yohei、Habermann Jens
    • Journal Title

      Rendiconti Lincei - Matematica e Applicazioni

      Volume: 29 Issue: 2 Pages: 343-376

    • DOI

      10.4171/rlm/810

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] On the effect of higher order derivatives of initial data on the blow-up set for a semilinear heat equation2018

    • Author(s)
      Fujishima Yohei
    • Journal Title

      Communications on Pure and Applied Analysis

      Volume: 17 Issue: 2 Pages: 449-475

    • DOI

      10.3934/cpaa.2018025

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] Blow-up set of type I blowing up solutions for nonlinear parabolic systems2017

    • Author(s)
      Fujishima Yohei、Ishige Kazuhiro、Maekawa Hiroki
    • Journal Title

      Mathematische Annalen

      Volume: 369 Issue: 3-4 Pages: 1491-1525

    • DOI

      10.1007/s00208-016-1498-7

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Global higher integrability for non-quadratic parabolic quasi-minimizers on metric measure spaces2017

    • Author(s)
      Fujishima Yohei、Habermann Jens
    • Journal Title

      Advances in Calculus of Variations

      Volume: 10 Issue: 3 Pages: 267-301

    • DOI

      10.1515/acv-2015-0038

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] 自己相似性を持たない半線形熱方程式の可解性2019

    • Author(s)
      藤嶋陽平
    • Organizer
      日本数学会2019年度年会函数方程式論分科会特別講演
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] Existence and nonexistence of global in time solutions for a superlinear heat equation2018

    • Author(s)
      藤嶋陽平
    • Organizer
      RIMS共同研究(公開型)反応拡散方程式ー伝播現象と特異性の解析および諸科学への応用ー
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] Global in time existence of solutions for the heat equation with a superlinear source term2018

    • Author(s)
      Yohei Fujishima
    • Organizer
      Workshop on Nonlinear Parabolic PDEs
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Global in time existence of solutions for the heat equation with a superlinear source term2018

    • Author(s)
      藤嶋陽平
    • Organizer
      RIMS共同研究(公開型)保存則をもつ偏微分方程式の解の正則性, 特異性および漸近挙動の研究
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] Finite propagation of the support of a parabolic quasiminimizer2018

    • Author(s)
      Fujishima Yohei
    • Organizer
      Conference on `Metrics and Measures'
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Existence and nonexistence of solutions for the heat equation with a superlinear source term2016

    • Author(s)
      Yohei Fujishima
    • Organizer
      7th Euro-Japanese workshop on blow-up
    • Place of Presentation
      Bedlewo conference center, Poland
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] Existence and nonexistence of solutions for a heat equation with a superlinear source term2015

    • Author(s)
      藤嶋陽平
    • Organizer
      微分方程式の総合的研究
    • Place of Presentation
      東京大学大学院数理科学研究科(東京都目黒区)
    • Year and Date
      2015-12-19
    • Related Report
      2015 Research-status Report
    • Invited
  • [Remarks]

    • URL

      https://tdb.shizuoka.ac.jp/RDB/public/Default2.aspx?id=11169&l=0

    • Related Report
      2017 Research-status Report

URL: 

Published: 2015-04-16   Modified: 2020-03-30  

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