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An approach to soliton theory by the method of the Sato Grassmannian and multi-variate sigma functions

Research Project

Project/Area Number 15K04907
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Basic analysis
Research InstitutionTsuda University

Principal Investigator

Nakayashiki Atsushi  津田塾大学, 学芸学部, 教授 (10237456)

Research Collaborator Yamada Yasuhiko  
Inoue Rei  
Project Period (FY) 2015-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2017: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2016: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2015: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Keywords一般化ソリトン / KP方程式 / 通常3重点 / 佐藤グラスマン / リーマンテータ関数 / 多変数シグマ関数 / タウ関数 / 準周期解 / 一般化ソリトン解 / 可約代数曲線 / 超楕円曲線 / ソリトン解 / ブシネ方程式 / 特異有理曲線 / 通常n重点 / KP階層 / (n,s)曲線 / Giambelli公式 / シューア関数 / テータ関数解 / 通常2重点
Outline of Final Research Achievements

The KP equation describes shallow water waves and is known to possess soliton solutions. It has several other solutions. The class of solutions expressed by theta functions is one of them. They describe periodic solutions for example.A theta function solution is associated with a complex algebraic curve which, geometrically, is considered as a surface with several holes. If we tend the period to infinity of a periodic solution, then the solution approaches to a soliton solution. The KP equation has hidden symmetries. Then a theta function solution has several independent periods. Therefore there are several ways to tend periods to infinity. Consequently various curious solutions can appear as limits of a theta function solution. However there were technical difficulties in taking these limits.

In the present research we have overcome these difficulties by the method of the Sato Grassmannian and computed limits of theta function solutions for various families of plane algebraic curves.

Academic Significance and Societal Importance of the Research Achievements

ソリトンは非線形波動の一種で厳密な解析が可能であることから数学的にも応用上も多方面から研究されてきた。ソリトンを記述する方程式はソリトンの他にも様々な解を持つ。テータ関数解はその一つでソリトンはその極限であると考えられている。極限を厳密に計算することは種々の観点から興味のある問題であるが技術的に難しい問題であった。本研究では佐藤グラスマンの方法という新しい方法を提案しそれが確かにテータ関数解の極限の計算に有効であることを様々な例で実証した。この方法は平坦でない波の上に出来るソリトンやrogue wavesなど最近活発に研究されている問題に新しい研究方法を提供すると期待される。

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

    (15 results)

All 2019 2018 2017 2016 2015 Other

All Int'l Joint Research (2 results) Journal Article (4 results) (of which Peer Reviewed: 4 results,  Open Access: 2 results) Presentation (9 results) (of which Int'l Joint Research: 5 results,  Invited: 7 results)

  • [Int'l Joint Research] 国立大学 Kyiv-Mohyla Academy(ウクライナ)

    • Related Report
      2018 Annual Research Report
  • [Int'l Joint Research] キエフ・モヒーラ アカデミー国立大学(ウクライナ)

    • Related Report
      2017 Research-status Report
  • [Journal Article] On reducible degeneration of hyperelliptic curves and soliton solutions2019

    • Author(s)
      Atsushi Nakayashiki
    • Journal Title

      Symmetry,Integrability and Geometry:Methods and Applications

      Volume: 15-009

    • DOI

      10.3842/sigma.2019.009

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Degeneration of trigonal curves and solutions of the KP-hierarchy2018

    • Author(s)
      Atsushi Nakayashiki
    • Journal Title

      Nonlinearity

      Volume: 31 Issue: 8 Pages: 3567-3590

    • DOI

      10.1088/1361-6544/aabf00

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] On the expansion coefficients of KP tau function2017

    • Author(s)
      Atsushi Nakayashiki, Soichi Okada, Yoko Shigyo
    • Journal Title

      Journal of Integrable Systems

      Volume: 2 Issue: 1 Pages: 1-23

    • DOI

      10.1093/integr/xyx007

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Tau function approach to theta functions2015

    • Author(s)
      Atsushi Nakayashiki
    • Journal Title

      International Mathematics Research Notices

      Volume: rnv297 Issue: 17 Pages: 1-47

    • DOI

      10.1093/imrn/rnv297

    • Related Report
      2015 Research-status Report
    • Peer Reviewed
  • [Presentation] Tau function approach to degenerations of hyperelliptic sigma functions2018

    • Author(s)
      Atsushi Nakayashiki
    • Organizer
      BIRS workshop "Tau Functions of Integrable Systems and Their Applications"
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 佐藤グラスマンは解の具体的計算に使える2018

    • Author(s)
      Atsushi Nakayashiki
    • Organizer
      可積分系ウィンタースクールat本庄早稲田
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] Solutions of the KP-hierarchy corresponding to degenerate trigonal curves2017

    • Author(s)
      Atsushi Nakayashiki
    • Organizer
      Physics and Mathematics of Nonlinear Phenomena, 50 years of I.S.T.
    • Related Report
      2017 Research-status Report
  • [Presentation] Degeneration of trigonal curves and corresponding solutions of the KP-hierarchy2017

    • Author(s)
      Atsushi Nakayashiki
    • Organizer
      Workshop on Calabi-Yau manifolds, Arithmetic, Geometry and Physics
    • Related Report
      2017 Research-status Report
  • [Presentation] 特異有理曲線から構成されるKP階層の解について2016

    • Author(s)
      中屋敷 厚
    • Organizer
      可積分系数理の現状と展望
    • Place of Presentation
      京都大学
    • Year and Date
      2016-09-05
    • Related Report
      2016 Research-status Report
    • Invited
  • [Presentation] Singular rational curves and solutions of the KP hierarchy2016

    • Author(s)
      Atsushi Nakayashiki
    • Organizer
      Infinite Analysis 16 Summer School, Integrable Hierarchies and Beyond
    • Place of Presentation
      Nagoya University
    • Year and Date
      2016-08-29
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] On the character formula of the D-module associated to KdV hierarchy2016

    • Author(s)
      Atsushi Nakayashiki
    • Organizer
      KIAS workshop on integrable systems and related topics
    • Place of Presentation
      Korea Institute for Advanced Study, Seoul, Korea
    • Year and Date
      2016-06-21
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Character formulae of some D-modules on hyperelliptic Jacobians2015

    • Author(s)
      Atsushi Nakayashiki
    • Organizer
      Geometry Days in Novosibirsk
    • Place of Presentation
      Sobolev Institute of Mathematics, Novosibirsk,Russia
    • Year and Date
      2015-08-26
    • Related Report
      2015 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] On a combinatorial structure of some D-modules on Abelian varieties2015

    • Author(s)
      Atsushi Nakayashiki
    • Organizer
      Tsuda College Mini-Workshop on Calabi Yau varieties:Arithmetic Geometry and Physics
    • Place of Presentation
      Tsuda College
    • Year and Date
      2015-08-05
    • Related Report
      2015 Research-status Report
    • Int'l Joint Research / Invited

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Published: 2015-04-16   Modified: 2023-07-20  

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