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2018 Fiscal Year Annual Research Report

Pursuit of explicit representation formula using elliptic and analysis of the global bifurcation structure

Research Project

Project/Area Number 15K04972
Research InstitutionRyukoku University

Principal Investigator

四ツ谷 晶二  龍谷大学, 理工学部, 教授 (60128361)

Co-Investigator(Kenkyū-buntansha) 森田 善久  龍谷大学, 理工学部, 教授 (10192783)
Project Period (FY) 2015-04-01 – 2019-03-31
Keywords非線形境界値問題 / 完全楕円積分 / 楕円関数 / 交差拡散方程式 / 反応拡散方程式 / 極限方程式 / 非局所 / 線形化固有値問題
Outline of Annual Research Achievements

交差拡散方程式(cross-diffusion 方程式)については,交差拡散の効果をあらわすパラメータを無限大とにした定常極限方程式の場合,および,パラメータが十分大の場合に,拡散係数が定常解存在域の上限に近づいた状況での空間多次元の安定な定常解の存在についての画期的な定理を Y. Lou 教授,W.-M. Ni 教授との共著論文として欧文誌に発表した.
空間1次元で一般的な定常極限方程式に対しては,これまでずっと定常解は高々2個存在すると思われていたが,拡散係数が極めて小さいとき,定常解が3個存在するパラメータ領域が存在することを,楕円関数を用いた解の表示式に基づく,半解析的方法により数値的に示した.さらに,線形化方程式を離散化して行列の一般化固有値問題を導出して,固有値の様子を詳細に調べて,線形化安定性・不安定性を数値的に明らかにした.これらのことを,森竜樹博士,鈴木貴教授との共著論文として欧文誌に発表した.解の一意性と重複度については,半解析的方法より,パラメータに応じての,それらの変化を数値的に状況把握した.一意性の成立状況での数学的証明は成功しているが,計算が余りにも膨大となってしまったので,欧文誌に発表のために証明の簡明化と改良に取り組んでいる.
細胞極性を記述するある数理モデルにおいて,拡散係数を無限大とした定常極限方程式の大域的解構造を解明し,森竜樹博士,久藤衡介教授,辻川亨教授との共著論文として欧文誌に発表した.
関連する新しい数理モデルとして,非線形項が解の定積分値で定まる,非局所項を含む,Neumann 境界条件下での空間1次元 Allen-Cahn 方程式の定常解の大域的分岐構造を,久藤教授,森博士,辻川教授との共著論文として欧文誌に発表した.
さらに,空間1次元 Allen-Cahn 方程式の線形化固有値問題等についての共著論文を欧文誌に発表した.

  • Research Products

    (16 results)

All 2019 2018

All Journal Article (4 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 4 results) Presentation (12 results) (of which Int'l Joint Research: 10 results,  Invited: 10 results)

  • [Journal Article] Entire solutions to reaction-diffusion equations in multiple half-lines with a junction2019

    • Author(s)
      S. Jimbo and Y. Morita
    • Journal Title

      J. Differential Equations

      Volume: 267 Pages: 1247-1276

    • DOI

      10.1016/j.jde.2019.02.008

    • Peer Reviewed
  • [Journal Article] Global solution branches for a nonlocal Allen-Cahn equation2018

    • Author(s)
      K. Kuto, T. Mori, T. Tsujikawa and S. Yotsutani
    • Journal Title

      J. of Differential Equations

      Volume: 264 Pages: 5928-5949

    • DOI

      10.1016/j.jde.2018.01.025

    • Peer Reviewed
  • [Journal Article] Numerical approach to existence and stability of stationary solutions to a SKT cross-diffusion equation2018

    • Author(s)
      T. Mori, T. Suzuki and S. Yotsutani
    • Journal Title

      Mathematical Models and Methods in Applied Sciences

      Volume: 28 Pages: 2191-2210

    • DOI

      10.1142/S0218202518400122

    • Peer Reviewed
  • [Journal Article] Stability and spectral comparison of a reaction-diffusion system with mass conservation2018

    • Author(s)
      E. Latos, T. Suzuki, and Y. Morita
    • Journal Title

      J. Dyn. Diff. Equat.

      Volume: 30 Pages: 823-844

    • DOI

      10.1007/s10884-018-9650-6

    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Solution structure of stationary solutions of a limiting SKT cross-diffusion equation2019

    • Author(s)
      Y. Lou, T. Mori, W.-M. Ni, S. Yamakawa and S. Yotsutani
    • Organizer
      The 10th Taiwan-Japan Joint Workshop for Young Scholars in Applied Mathematics
    • Int'l Joint Research / Invited
  • [Presentation] Global bifurcation structure of a limiting system to the SKT competition model with cross-diffusion2018

    • Author(s)
      S. Yotsutani
    • Organizer
      RIMS 共同研究(公開型)常微分方程式の定性的理論および数理モデル研究への応用
    • Int'l Joint Research / Invited
  • [Presentation] Numerical approach to existence and stability of stationary solutions to a SKT cross-diffusion equation2018

    • Author(s)
      森 竜 樹, 鈴 木 貴, 四 ツ 谷 晶 二
    • Organizer
      日本数学会2018年度秋季総合分科会 応用数学分科会
  • [Presentation] SKT交差拡散定常極限方程式の解の多重度と安定性の数値解析2018

    • Author(s)
      森 竜樹, 鈴木 貴, 四ツ谷 晶二
    • Organizer
      日本応用数理学会2018年度年会
  • [Presentation] Existence, nonexistence, multiplicity, and numerical stability of solutions for the SKT cross-diffusion stationary limiting equation2018

    • Author(s)
      T. Mori, Y. Lou, H. Matsubara, W.-M. Ni, S. Sukekuni and S. Yotsutani
    • Organizer
      The 12th AIMS Conference on Dynamical Systems, Differential Equations and Applications, Taipei, Taiwan
    • Int'l Joint Research / Invited
  • [Presentation] Bifurcation structure of steady states for the one-dimensional nonlocal Allen-Cahn equation2018

    • Author(s)
      K. Kuto, Y. Miyamoto, T. Mori, T. Tsujikawa and S. Yotsutani
    • Organizer
      The 12th AIMS Conference on Dynamical Systems, Differential Equations and Applications, Taipei, Taiwan
    • Int'l Joint Research / Invited
  • [Presentation] On the asymptotic form of solutions of the Tadjbakhsh-Odeh`s variational problem2018

    • Author(s)
      M. Murai and S. Yotsutani
    • Organizer
      The 12th AIMS Conference on Dynamical Systems, Differential Equations and Applications, Taipei, Taiwan
    • Int'l Joint Research / Invited
  • [Presentation] Turing-type instability in coupled equations of bulk and lateral diffusions2018

    • Author(s)
      Y. Morita
    • Organizer
      ReaDiNet2018
    • Int'l Joint Research / Invited
  • [Presentation] Entire solutions to reaction-diffusion equations in a domain of star graph2018

    • Author(s)
      Y. Morita
    • Organizer
      The 43rd Sapporo Symposium on Partial Differential Equations
    • Int'l Joint Research / Invited
  • [Presentation] Entire solutions of reaction-diffusion equations in multiple semi-infinite intervals with a junction2018

    • Author(s)
      Y. Morita
    • Organizer
      The 12th AIMS Conference on Dynamical Systems, Differential Equations and Applications
    • Int'l Joint Research / Invited
  • [Presentation] Turing-type instability of diffusion equations with mass transport through the boundary2018

    • Author(s)
      Y. Morita
    • Organizer
      The 12th AIMS Conference on Dynamical Systems, Differential Equations and Applications_
    • Int'l Joint Research / Invited
  • [Presentation] Entire solutions to a reaction-diffusion equation in a domain of half-lines with a junction2018

    • Author(s)
      Y. Morita
    • Organizer
      Infinite Dimensional and Stochastic Dynamical Systems
    • Int'l Joint Research / Invited

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Published: 2019-12-27  

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