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Blowup phenomena in chemotaxis system

Research Project

Project/Area Number 23K20222
Project/Area Number (Other) 20H01814 (2020-2023)
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeMulti-year Fund (2024)
Single-year Grants (2020-2023)
Section一般
Review Section Basic Section 12020:Mathematical analysis-related
Research InstitutionTokyo Gakugei University

Principal Investigator

溝口 紀子  東京学芸大学, 教育学部, 准教授 (00251570)

Co-Investigator(Kenkyū-buntansha) 中西 賢次  京都大学, 数理解析研究所, 教授 (40322200)
高田 了  東京大学, 大学院数理科学研究科, 准教授 (50713236)
Project Period (FY) 2020-04-01 – 2025-03-31
Project Status Granted (Fiscal Year 2024)
Budget Amount *help
¥17,550,000 (Direct Cost: ¥13,500,000、Indirect Cost: ¥4,050,000)
Fiscal Year 2024: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2023: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2022: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2021: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2020: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Keywordsblowup / chemotaxis / 爆発 / Hamilton-Jacobi / 走化性方程式系 / Keller-Segel / 爆発現象 / Keller-Segel系
Outline of Research at the Start

走化性方程式系は生物学におけるバクテリアの集中現象を定式化したものである。また、高次元で拡散項が退化している場合は宇宙物理学への応用がある。特異性が現れる現象は数学的には有限時間での解の爆発と定義される。本研究では、それらの方程式に対して爆発後の解の弱解としての延長について研究する。また、爆発する解のエネルギーは時間が爆発時刻に近づくときにどのように変化するかについて研究する。さらに解が有限時間で爆発するような特徴をもつ他の方程式との類似点や相違点を考察することにより解の爆発が起こるメカニズムを研究する。

Outline of Annual Research Achievements

研究代表者は、走化性方程式系や関連する非線形方程式であるHamilton-Jacobi方程式の解の爆発や爆発した解の爆発時間後の弱解としての挙動を研究した。走化性方程式系では退化した場合も含めて総合的な結果にまとめてから論文の形にしたいと考えている。Hamilton-Jacobi方程式では得られた結果を多次元空間や確率論への応用も含めた形で完成させたいと考えて、それを進めているところであり、それらが完成した後に論文の形にしたいと考えている。
解の爆発を考えるとき、その対極にある時間大域的に存在する解の性質を調べることは重要である。研究分担者の中西賢二は、非線形Klein-Gordon方程式の多重ソリトン周辺の大域ダイナミクスについて調べ、有限時間内に爆発しなければ元の数以下のソリトンと分散波に漸近することを示した(多重ソリトン近傍に限定されたソリトン分解予想)。定数係数偏微分作用素またはフーリエ積作用素と解析的非線形項から成る非常に一般的な非線形偏微分方程式系に対して、フーリエ変換の台が半空間内にあるという制限下で、緩増加超関数より広い超関数空間を構成し、初期値問題の時間大域適切性を示した。研究分担者の高田了は、全空間において非斉次項付き半線形分数冪熱方程式の可解性に関して研究を行い、可解性に関して最適な特異性を許容する弱型Zygmund空間に属する非斉次項に対して同方程式の時間局所可解性を証明した。

Current Status of Research Progress
Current Status of Research Progress

2: Research has progressed on the whole more than it was originally planned.

Reason

非線形偏微分方程式系では、解の有限時間における爆発を研究するとき、対極にある時間大域的な解の挙動を調べることは重要である。そのためには時間変化を伴う解の挙動だけでなく時間大域解の定常解の近くでの性質を調べることは基本的な方法である。また、解の特異性は有限時間だけでなく時刻無限大でも起こりうる。走化性方程式系だけでなく、研究分担者からもそれぞれの研究からの観点で意見を出してもらいながら、解の特異性が現れるような関連する方程式も研究することによって非線形問題において特異性の発現にかかわるメカニズムを研究した。完成度の高い結果を得ることを目指した研究をすすめることができていると考えている。全体的にみて、おおむね順調に進展していると思われる.。

Strategy for Future Research Activity

近年では数学は理学や工学などの自然科学系だけでなくデータサイエンスや経済学などにも幅広く応用され、以前より数学の社会的なニーズも高まっている。研究組織で得られた数学的な結果が応用では実際にどのような現象に対応するかを知ることは、数学を応用する観点だけでなく応用分野からの問題提起によって新しい数学の理論や手法が求められ数学自身の発展を促す効果も大きい。
走化性方程式系に類似した性質をもつ放物型方程式との関連だけでなく視野を広げて、他の方程式や代数学、幾何学など数学の他の分野における理論や手法も取り込むことによって研究を進展させる。本研究では、意図的に異なる方程式の研究者を研究分担者として研究組織を構成しているが、研究組織内での共同研究だけでなく、結果の予測やモデルのシミュレーションが必要になれば数値解析の専門家にも協力してもらう。また、走化性方程式系やviscous Hamilton-Jacobi方程式は、生物学、宇宙物理学、金融工学などへの応用も期待される研究対象なので、応用分野の研究者との議論することも取り入れる。

Report

(4 results)
  • 2023 Annual Research Report
  • 2022 Annual Research Report
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • Research Products

    (44 results)

All 2024 2023 2022 2021 2020 2019

All Journal Article (14 results) (of which Int'l Joint Research: 5 results,  Peer Reviewed: 14 results,  Open Access: 3 results) Presentation (30 results) (of which Int'l Joint Research: 17 results,  Invited: 30 results)

  • [Journal Article] Global solutions for the rotating magnetohydrodynamics system in the scaling critical Sobolev space2024

    • Author(s)
      Ryo Takada, Keiji Yoneda
    • Journal Title

      Funkcial. Ekvac.(accepted)

      Volume: -

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Global dynamics around and away from solitons2023

    • Author(s)
      Kenji Nakanishi
    • Journal Title

      International Congress of Mathematicians, Berlin, Germany

      Volume: 5 Pages: 3822-3840

    • DOI

      10.4171/icm2022-5

    • ISBN
      9783985470631, 9783985475636
    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] The Zakharov system in di mension d\geq42023

    • Author(s)
      Timothy Candy, Sebastian Herr, Kenji Nakanishi
    • Journal Title

      J. Eur. Math. Soc.

      Volume: 25 Pages: 3177-3228

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Large time behavior of solutions to the 3D rotating Navier-Stokes equations2023

    • Author(s)
      Takanari Egashira, Ryo Takada
    • Journal Title

      J. Math. Fluid Mech.

      Volume: 25 Issue: 1 Pages: 23-31

    • DOI

      10.1007/s00021-023-00767-x

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Global wellposedness for the energy-critical Zakharov system below the ground state2021

    • Author(s)
      Candy Timothy、Herr Sebastian、Nakanishi Kenji
    • Journal Title

      Advances in Mathematics

      Volume: 384 Pages: 107746-107746

    • DOI

      10.1016/j.aim.2021.107746

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] The Zakharov system in 4D radial energy space below the ground state2021

    • Author(s)
      Guo Zihua、Nakanishi Kenji
    • Journal Title

      American Journal of Mathematics

      Volume: 143 Issue: 5 Pages: 1527-1600

    • DOI

      10.1353/ajm.2021.0039

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Asymptotic limit of fast rotation for the incompressible Navier-Stokes equations in a 3D layer2021

    • Author(s)
      Hiroki Ohyama and Ryo Takada
    • Journal Title

      Journal of Evolution Equations

      Volume: 21 Issue: 2 Pages: 2591-2629

    • DOI

      10.1007/s00028-021-00697-z

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Failure of scattering to solitary waves for long-range nonlinear Schrodinger equations2021

    • Author(s)
      Murphy Jason、Nakanishi Kenji
    • Journal Title

      Discrete & Continuous Dynamical Systems - A

      Volume: 41 Issue: 3 Pages: 1507-1517

    • DOI

      10.3934/dcds.2020328

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Higher-order interpolation inequalities with weights for radial functions2021

    • Author(s)
      Ryo Takada and Keiji Yoneda
    • Journal Title

      Nonlinear Analysis

      Volume: 203 Pages: 112158-112158

    • DOI

      10.1016/j.na.2020.112158

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Criterion on initial energy for finite-time blowup in parabolic-parabolic Keller-Segel system2020

    • Author(s)
      Noriko Mizoguchi
    • Journal Title

      SIAM J. Math. Anal

      Volume: 52 Issue: 6 Pages: 5840-5864

    • DOI

      10.1137/19m1280570

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Finite-time blowup in Cauchy problem of parabolic-parabolic chemotaxis system2020

    • Author(s)
      Noriko Mizoguchi
    • Journal Title

      J. Math. Pures Appl.

      Volume: 136 Pages: 203-238

    • DOI

      10.1016/j.matpur.2019.10.004

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Non-uniqueness for an energy-critical heat equation on R22020

    • Author(s)
      Ibrahim Slim、Kikuchi Hiroaki、Nakanishi Kenji、Wei Juncheng
    • Journal Title

      Mathematische Annalen

      Volume: 380 Issue: 1-2 Pages: 317-348

    • DOI

      10.1007/s00208-020-01961-2

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Long time solutions for the 2D inviscid Boussinesq equations with strong stratification2020

    • Author(s)
      Takada Ryo
    • Journal Title

      manuscripta math.

      Volume: - Issue: 1-2 Pages: 223-250

    • DOI

      10.1007/s00229-019-01174-1

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Determination of blowup type in the parabolic-parabolic Keller-Segel system2019

    • Author(s)
      N. Mizoguchi
    • Journal Title

      Math. Ann.

      Volume: 印刷中 Issue: 1-2 Pages: 39-60

    • DOI

      10.1007/s00208-018-1772-y

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Presentation] Large time behavior of global solutions to the rotating Navier-Stokes equations2024

    • Author(s)
      Ryo Takada
    • Organizer
      Geometric PDE and Applied Analysis Seminar, Okinawa Institute of Science and Technology
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] Global dynamics and threshold manifolds around solitons2023

    • Author(s)
      Kenji Nakanishi
    • Organizer
      Hamiltonian and dispersive PDEs, Rome, Italy
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Global wellposedness of general evolution PDE on the Four ier half space2023

    • Author(s)
      Kenji Nakanishi
    • Organizer
      International Conference on Recent Advances in Nonl inear PDEs and their Applications, Hong Kong, China
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Global dynamics around multi-solitons to the nonlinear Klein-Gordon equation2023

    • Author(s)
      Kenji Nakanishi
    • Organizer
      Nonlinear dispersive and wave equations, Recent developments and future directions, Australia
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Large time behavior of global solutions to the Navier-Stokes equations with the Coriolis force2023

    • Author(s)
      Ryo Takada
    • Organizer
      応用数理解析セミナー, 東北大学
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] Global solutions for rotating MHD equations in the critical space, Recent development of mathematical geophysics2023

    • Author(s)
      Ryo Takada
    • Organizer
      The 10th International Congress on Industrial and Applied Mathematics, Waseda Univ.
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Large time behavior of global solutions to the Navier-Stokes equations with the Coriolis force2023

    • Author(s)
      Ryo Takada
    • Organizer
      MSJ-KMS Joint Meeting 2023, Tohoku Univ.
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Large time behavior of global solutions to the rotating Navier-Stokes equations2023

    • Author(s)
      Ryo Takada
    • Organizer
      Workshop on Recent Developments in Evolutionary Equations and Related Topics, National Taiwan Univ., Taipei, TAIWAN
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Large time behavior of global solutions to the rotating Navier-Stokes equations2023

    • Author(s)
      Ryo Takada
    • Organizer
      East Asian Workshop on Partial Differential Equations from Kinetics and Continuum Mechanics in Tokyo,Tokyo Institute of Technology
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Global dynamics around and away from solitons2022

    • Author(s)
      Kenji Nakanishi
    • Organizer
      In ternational Congress of Mathematicians 2022(online)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Global dynamics around multi-solitons for nonlinear Klein- Gordon equations2022

    • Author(s)
      Kenji Nakanishi
    • Organizer
      Mathematical Analysis of Nonlinear Dispersive and Wave Equations, Waseda Univ.
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Global dynamics around multi-solitons for the nonlinear K lein-Gordon equation2022

    • Author(s)
      Kenji Nakanishi
    • Organizer
      New trends in Mathematics of Dispersive, Inte grable and Nonintegrable Models in Fluids, Waves and Quantum Physics", 場所: BIRS Canada
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] On the Hartree equation in the Schatten class2022

    • Author(s)
      Kenji Nakanishi
    • Organizer
      T he 19th Linear and Nonlinear Waves, Osaka Univ.
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Global solutions for the incompressible rotating MHD system in the scaling critical Sobolev space2022

    • Author(s)
      Ryo Takada
    • Organizer
      応用解析研究会, 早稲田大学
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Global solutions for the incompressible rotating MHD equations in the scaling critical Sobolev space2022

    • Author(s)
      Ryo Takada
    • Organizer
      神楽坂解析セミナー, 東京理科大学
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Global solutions for the incompressible rotating MHD equations in the scaling critical Sobolev space2022

    • Author(s)
      Ryo Takada
    • Organizer
      International Workshop on PDEs arising in Fluid Dynamics, KAIST(online)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 回転成層流体に現れる分散性と異方性の数学解析2022

    • Author(s)
      Ryo Takada
    • Organizer
      東京大学数理科学講演会, 東京大学
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Global solutions for the incompressible rotating MHD equations in the scaling critical Sobolev space2022

    • Author(s)
      Ryo Takada
    • Organizer
      NLPDEセミナー, 京都大学
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Global solutions for the incompressible rotating MHD equations in the scaling critical Sobolev space2022

    • Author(s)
      Ryo Takada
    • Organizer
      解析セミナー, 神戸大学
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Global solutions for the incompressible rotating MHD equations in the scaling critical Sobolev space2022

    • Author(s)
      Ryo Takada
    • Organizer
      International Workshop on Multi-Phase Flows: Analysis, Modelling and Numerics, Waseda Univ.
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Global solutions for the incompressible rotating MHD system in the scaling critical Sobolev space2022

    • Author(s)
      Rho Takada
    • Organizer
      East Asian Workshop on Partial Differential Equations in Fluid Dynamics
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Long Time Behavior and Singularity Formation in PDEs-Part III \\ Classification of GBU and RBC behaviors in the viscous Hamilton-Jacobi equation2021

    • Author(s)
      Noriko Mizoguchi
    • Organizer
      Long Time Behavior and Singularity Form ation in PDEs, SITE Conference, NYU (Abu Dhabi)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Global dynamics around two‐solitons for the damped nonlin ear Klein‐Gordon equation2021

    • Author(s)
      Kenji Nakanishi
    • Organizer
      Long Time Behavior and Singularity Form ation in PDEs, SITE Conference, NYU (Abu Dhabi)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Global wellposedness for the Zakharov system in 4D below t he ground state2021

    • Author(s)
      Kenji Nakanishi
    • Organizer
      International Workshop on Recent Advances in Nonli near Partial Differential Equations, Chaina
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] Trudinger-Moser 不等式の最大化問題の境界非線形項2021

    • Author(s)
      中西賢次
    • Organizer
      偏微分方程式の解の幾何的様相, 京都大学数理解析研究所
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] Asymptotic limit of fast rotation for the incompressible Navier-Stokes equations in a 3D layer2021

    • Author(s)
      高田了
    • Organizer
      東京大学解析学火曜セミナー
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] Fast rotation limit for the incompressible Navier-Stokes equations in a 3D layer2021

    • Author(s)
      高田了
    • Organizer
      鳥取PDE研究集会
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] Fast rotation limit for the incompressible Navier-Stokes equations in a 3D layer2021

    • Author(s)
      Rho Takada
    • Organizer
      Mathematical Analysis of Viscous Incompressible Fluid
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Fast rotation limit for the incompressible Navier-Stokes equations in a 3D layer2021

    • Author(s)
      高田了
    • Organizer
      東工大数理解析セミナー
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] Singularity formation and regularization at multiple times in the viscous Hamilton-Jacobi equation2020

    • Author(s)
      Noriko Mizoguchi
    • Organizer
      『応用解析』研究会, 早稲田大学
    • Related Report
      2020 Annual Research Report
    • Invited

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Published: 2020-04-28   Modified: 2024-12-25  

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