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Evolution equations with the coexistence of fractional derivatives and nonlinear structures

Research Project

Project/Area Number 18K18715
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 12:Analysis, applied mathematics, and related fields
Research InstitutionTohoku University

Principal Investigator

Akagi Goro  東北大学, 理学研究科, 教授 (60360202)

Project Period (FY) 2018-06-29 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
Fiscal Year 2020: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2019: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2018: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywords非整数階微分 / 非線形問題 / 発展方程式 / 異常拡散 / 多重スケール構造 / 多重スケール / 非整数回微分
Outline of Final Research Achievements

The main results of this research project consist of the following:
(1) We established a theory for fractional (in time) gradient flows in Hilbert spaces. This result extends the so-called Brezis-Komura theory, which is concerned with classical gradient flows and has been used to analyze various nonlinear partial differential equations, to fractional evolution equations and can provide a basic frame for studying time-fractional partial differential equations, whose well-posedness (e.g., existence and uniqueness of solutions) has been open for long time.
(2) We proved a gradient inequality for fractional Laplacians restricted on domains and non-analytic potentials and applied it to prove the convergence of solutions to equilibria for the fractional Cahn-Hilliard systems.

Academic Significance and Societal Importance of the Research Achievements

拡散現象や相転移現象のような不可逆過程については、前世紀に物理学の古典論が確立し、その後、様々な現象の解析に適用されてきた。しかしその過程に於いて、古典論の予測から大きく逸脱する不可逆現象が多々発見されるようになり、古典論の見直しに対する強い動機をもたらした。ここで扱う非整数階微分や非線形拡散は古典論の修正に効果的であり、多くの注目を集めている。本研究課題の研究成果はそのような新しい構造を伴う数学的対象に対して、十分な汎用性と応用性を兼ね備えた理論を与え、この分野の研究に於いて1つの基盤となるものと考える。数学的基盤が整備されることで応用研究の土台が整い、広範な分野への波及効果が期待される。

Report

(6 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (49 results)

All 2023 2022 2021 2020 2019 2018 Other

All Int'l Joint Research (13 results) Journal Article (6 results) (of which Int'l Joint Research: 4 results,  Peer Reviewed: 6 results,  Open Access: 2 results) Presentation (25 results) (of which Int'l Joint Research: 7 results,  Invited: 18 results) Remarks (4 results) Funded Workshop (1 results)

  • [Int'l Joint Research] ウィーン大学(オーストリア)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] パヴィア大学(イタリア)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] ミュンヘン工科大学/ドレスデン工科大学(ドイツ)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] University of Pavia/University of Trento(イタリア)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] Technical University of Munich/Technical University of Dresden(ドイツ)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] University of Vienna(オーストリア)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] ウィーン大学(オーストリア)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] パヴィア大学(イタリア)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] パヴィア大学(イタリア)

    • Related Report
      2019 Research-status Report
  • [Int'l Joint Research] ドレスデン工科大学(ドイツ)

    • Related Report
      2019 Research-status Report
  • [Int'l Joint Research] University of Pavia/IMATI-CNR/University of Milan/University of Trento(イタリア)

    • Related Report
      2018 Research-status Report
  • [Int'l Joint Research] Technical University Munich/Helmholtz Center Munich/Technical University of Dresden(ドイツ)

    • Related Report
      2018 Research-status Report
  • [Int'l Joint Research] University of Vienna(オーストリア)

    • Related Report
      2018 Research-status Report
  • [Journal Article] Local well-posedness for Fr?mond’s model of complete damage in elastic solids2022

    • Author(s)
      AKAGI GORO、SCHIMPERNA GIULIO
    • Journal Title

      European Journal of Applied Mathematics

      Volume: 33 Issue: 2 Pages: 309-327

    • DOI

      10.1017/s0956792521000024

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Traveling wave dynamics for Allen-Cahn equations with strong irreversibility2022

    • Author(s)
      Akagi Goro、Kuehn Christian、Nakamura Ken-Ichi
    • Journal Title

      Transactions of the American Mathematical Society

      Volume: 375 Pages: 3173-3238

    • DOI

      10.1090/tran/8583

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Correction to: Weighted Energy-Dissipation approach to doubly nonlinear problems on the half line2021

    • Author(s)
      Akagi Goro、Melchionna Stefano、Stefanelli Ulisse
    • Journal Title

      Journal of Evolution Equations

      Volume: 21 Issue: 4 Pages: 5203-5207

    • DOI

      10.1007/s00028-021-00698-y

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] The Cauchy problem for the Finsler heat equation2020

    • Author(s)
      G. Akagi, K. Ishige, R. Sato
    • Journal Title

      Adv. Calc. Var.

      Volume: 13 Issue: 3 Pages: 257-278

    • DOI

      10.1515/acv-2017-0048

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Fractional flows driven by subdifferentials in Hilbert spaces2019

    • Author(s)
      Akagi Goro
    • Journal Title

      Israel Journal of Mathematics

      Volume: 234 Issue: 2 Pages: 809-862

    • DOI

      10.1007/s11856-019-1936-9

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Convergence of solutions for the fractional Cahn-Hilliard system2019

    • Author(s)
      Akagi Goro、Schimperna Giulio、Segatti Antonio
    • Journal Title

      Journal of Functional Analysis

      Volume: 276 Issue: 9 Pages: 2663-2715

    • DOI

      10.1016/j.jfa.2019.01.006

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Rate of convergence to asymptotic profiles for fast diffusion on domains via energy methods2023

    • Author(s)
      Goro Akagi
    • Organizer
      ReaDiNet 2023: International conference on parabolic and stochastic models in mathematical biology, パリ・サクレー大学
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Rate of convergence to asymptotic profiles for fast diffusion on domains via energy methods2023

    • Author(s)
      Goro Akagi
    • Organizer
      OIST conference ``Geometric PDEs and Applications'' Okinawa Institute of Science and Technology Graduate University (OIST)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Quantitative analysis of asymptotic profiles for fast diffusion on domains2023

    • Author(s)
      赤木 剛朗
    • Organizer
      第35回非線形発展方程式セミナー@KUE, 京都教育大学
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Rate of convergence to asymptotic profiles for fast diffusion on domains via energy methods2023

    • Author(s)
      赤木 剛朗
    • Organizer
      Workshop on Analysis in Kagurazaka 2023, 東京理科大学
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Rates of convergence to asymptotic profiles for fast diffusion on domains2023

    • Author(s)
      Goro Akagi
    • Organizer
      Research Group on Applied Mathematics and Modeling, Faculty of Mathematics, University of Vienna
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Rates of convergence to nondegenerate asymptotic profiles for fast diffusion on domains2023

    • Author(s)
      赤木 剛朗
    • Organizer
      非線形現象の数値シミュレーションと解析2023, 北海道大学
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Rate of convergence to nondegenerate asymptotic profiles for fast diffusion on domains2023

    • Author(s)
      赤木 剛朗
    • Organizer
      Saga Workshop on Partial Differential Equations, 佐賀大学
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Rate of convergence to asymptotic profiles for fast diffusion on domains via energy methods2023

    • Author(s)
      Goro Akagi
    • Organizer
      Oberseminar Dynamics, Technische Universitaet Muenchen
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Rate of convergence to asymptotic profiles for fast diffusion on domains via an energy method2023

    • Author(s)
      赤木 剛朗
    • Organizer
      7th camp Homogenization and its related topics, 東北大学大学院理学研究科数学専攻
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] 非整数階時間微分を含む発展方程式の可解性 とその応用2023

    • Author(s)
      赤木 剛朗, 中島 慶人(登壇者)
    • Organizer
      日本数学会 2023 年度年会, 実函数論分科会, 中央大学
    • Related Report
      2022 Annual Research Report
  • [Presentation] Maximal regularity of distributional solutions to degenerate elliptic systems for locally integrable data2023

    • Author(s)
      赤木 剛朗, 宮川 寛基(登壇者)
    • Organizer
      日本数学会 2023 年度年 会, 函数方程式論分科会, 中央大学
    • Related Report
      2022 Annual Research Report
  • [Presentation] On some quasistatic evolution equation arising from fracture mechanics2023

    • Author(s)
      赤木 剛朗, 佐藤 光汰朗(登壇者)
    • Organizer
      日本数学会 2023 年度年会, 函数方程式論分科会, 中央大 学
    • Related Report
      2022 Annual Research Report
  • [Presentation] Evolution equations with irreversibility constraints2022

    • Author(s)
      Goro Akagi
    • Organizer
      Inverse Problems and Control for PDEs and the Hamilton-Jacobi Equation: French-Italian-Japanese conference (via Zoom), CIRM-Luminy
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Rate of convergence to asymptotic profiles for fast diffusion equations2022

    • Author(s)
      赤木 剛朗
    • Organizer
      研究集会「非線型の諸問題」
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Rate of convergence to nondegenerate asymptotic profiles for fast diffusion2022

    • Author(s)
      赤木 剛朗
    • Organizer
      鳥取 PDE 研究集会
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Recent developments on finite-time extinction of energy solutions for fast diffusion equations on domains2022

    • Author(s)
      赤木 剛朗
    • Organizer
      「有限時間特異性」勉強会 第7回
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Rate of convergence to nondegenerate asymptotic profiles for fast diffusion2022

    • Author(s)
      赤木 剛朗
    • Organizer
      熊本大学応用解析セミナー
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Existence of energy solutions to fractional nonlinear diffusion equationsposed on bounded domains2022

    • Author(s)
      Florian Salin(登壇者), 赤木 剛朗
    • Organizer
      日本数学会 2022 年度秋 季総合分科会, 北海道大学
    • Related Report
      2022 Annual Research Report
  • [Presentation] A framework for proving existence of local-energy solutions to doubly-nonlinear diffusion equations with growing initial data2021

    • Author(s)
      赤木剛朗
    • Organizer
      応用数学セミナー, 東北大学大学院理学研究科数学専攻
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] Goro Akagi2021

    • Author(s)
      Rates of convergence to non-degenerate asymptotic profiles for fast diffusion equations via an energy method
    • Organizer
      BIRS-CMO Workshop ``New Trends in Nonlinear Diffusion: a Bridge between PDEs, Analysis and Geometry'', Banff International Research Station for Mathematical Innovation and Discovery (BIRS)
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Qualitative space-time homogenization for the porous medium equation2021

    • Author(s)
      岡 大将(登壇者)、赤木 剛朗
    • Organizer
      日本数学会 2021 年度年会函数方程式分科会
    • Related Report
      2020 Research-status Report
  • [Presentation] Corrector results for space-time homogenization of nonlinear diffusion2021

    • Author(s)
      岡 大将(登壇者)、赤木 剛朗
    • Organizer
      日本数学会 2021 年度年会函数方程式分科会
    • Related Report
      2020 Research-status Report
  • [Presentation] Fractional gradient flows in Hilbert spaces2019

    • Author(s)
      赤木剛朗
    • Organizer
      第 701 回『応用解析』研究会, 早稲田大学
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] Fractional Cahn-Hilliard system and Lojasiewicz-Simon gradient inequality2019

    • Author(s)
      赤木剛朗
    • Organizer
      偏微分方程式セミナー, 北海道大学
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] Fractional gradient flows in Hilbert spaces2019

    • Author(s)
      Goro Akagi
    • Organizer
      AMS Spring Central and Western Joint Sectional Meeting
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Remarks] Webpage of Goro Akagi

    • URL

      http://www.math.tohoku.ac.jp/~akagi/

    • Related Report
      2022 Annual Research Report
  • [Remarks] Website of Goro Akagi

    • URL

      http://www.math.tohoku.ac.jp/~akagi/

    • Related Report
      2021 Research-status Report
  • [Remarks] Webpage of Goro Akagi

    • URL

      http://www.math.tohoku.ac.jp/~akagi/index.html

    • Related Report
      2020 Research-status Report 2018 Research-status Report
  • [Remarks] http://www.math.tohoku.ac.jp/~akagi/index.html

    • Related Report
      2019 Research-status Report
  • [Funded Workshop] International Conference "Viscosity Solutions and Related Topics"2018

    • Related Report
      2018 Research-status Report

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Published: 2018-07-25   Modified: 2025-11-20  

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