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Differential geometry of surfaces with Weierstrass-type representaion formulae

Research Project

Project/Area Number 21K03226
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 11020:Geometry-related
Research InstitutionHiroshima University

Principal Investigator

Fujimori Shoichi  広島大学, 先進理工系科学研究科(理), 教授 (00452706)

Project Period (FY) 2021-04-01 – 2025-03-31
Project Status Completed (Fiscal Year 2024)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2024: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2023: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2022: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Keywordsワイエルシュトラス型表現公式 / 極小曲面 / 極大曲面 / 特異点 / 解析的拡張性 / 解析的拡張 / 解析的延長 / 回転不変 / 平均曲率0曲面
Outline of Research at the Start

本研究では、ワイエルシュトラス型表現公式をもつ曲面の族の構成方法や特異点の振る舞い、ならびにある種の特異点から生じる曲面の解析的拡張性を、主に微分幾何学的手法を用いて解析する。
ワイエルシュトラス型表現公式として、特に3次元Euclid空間内の極小曲面、3次元Minkowski空間内の空間的極大曲面や平均曲率0曲面、および3次元de Sitter空間内の空間的平均曲率1曲面を考察の対象とする。
これらの曲面が共有する性質や、1 部の曲面のみがもつ特別な性質を解明することが本研究の目的である。

Outline of Final Research Achievements

We studied surfaces with Weierstrass-type representation formulas, in particular minimal surfaces in Euclidean 3-space and (spacelike) maximal surfaces in Minkowski 3-space, as well as analytic extendability of certain surfaces with Weierstrass representation formulas, and surfaces whose Gaussian curvature is rotationally invariant. We then obtained some new results on the construction and classification of some surfaces. We also determined analytic extendability of some surfaces.

Academic Significance and Societal Importance of the Research Achievements

ユークリッド空間の周期的極小曲面は界面活性剤の膜や細胞のラメラ構造等の数学的モデルであることが知られており、数学者だけでなく物理学者、化学者、生物学者にとっても重要な研究対象である。本研究では主に複素解析的手法を用いて研究を行なったが、得られた結果は物理や化学、生物等の分野でも応用されることが期待される。
一方、ミンコフスキー空間の極大曲面に現れる錐的特異点は代数多様体等にも表れる特異点であり、特異点論の発展にも寄与すると思われる。

Report

(5 results)
  • 2024 Annual Research Report   Final Research Report ( PDF )
  • 2023 Research-status Report
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (21 results)

All 2024 2023 2022 Other

All Int'l Joint Research (8 results) Journal Article (3 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 3 results,  Open Access: 3 results) Presentation (8 results) (of which Int'l Joint Research: 6 results,  Invited: 6 results) Remarks (2 results)

  • [Int'l Joint Research] Indiana University South Bend/University of Notre Dame(米国)

    • Related Report
      2024 Annual Research Report
  • [Int'l Joint Research] Korea University(韓国)

    • Related Report
      2024 Annual Research Report
  • [Int'l Joint Research] Indiana University South Bend(米国)

    • Related Report
      2023 Research-status Report
  • [Int'l Joint Research] Korea University(韓国)

    • Related Report
      2023 Research-status Report
  • [Int'l Joint Research] Indiana University South Bend(米国)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] Korea University(韓国)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] Indiana University South Bend/University of Notre Dame(米国)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] Korea University(韓国)

    • Related Report
      2021 Research-status Report
  • [Journal Article] Higher genus nonorientable maximal surfaces in the Lorentz-Minkowski 3-space2023

    • Author(s)
      Fujimori Shoichi and Kaneda Shin
    • Journal Title

      Tohoku Mathematical Journal

      Volume: 75 Issue: 1 Pages: 1-14

    • DOI

      10.2748/tmj.20210907b

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Analytic extensions of constant mean curvature one geometric catenoids in de Sitter 3-space2022

    • Author(s)
      Shoichi Fujimori, Yu Kawakami, Masatoshi Kokubu, Wayne Rossman, Masaaki Umehara, Kotaro Yamada and Seong-Deog Yang
    • Journal Title

      Differential Geometry and Its Applications

      Volume: 84 Pages: 101924-101924

    • DOI

      10.1016/j.difgeo.2022.101924

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Higher genus nonorientable maximal surfaces in the Lorentz-Minkowski 3-space2022

    • Author(s)
      Shoichi Fujimori and Shin Kaneda
    • Journal Title

      Tohoku Mathematical Journal

      Volume: -

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 同心円状または平行直線状の等K線をもつ曲面について2024

    • Author(s)
      藤森祥一, 川上裕, 國分雅敏
    • Organizer
      日本数学会秋季総合分科会
    • Related Report
      2024 Annual Research Report
  • [Presentation] Zero mean curvature surfaces in Lorentz Minkowski spaces I, II, III2024

    • Author(s)
      Shoichi Fujimori
    • Organizer
      Discussion meeting on zero mean curvature surfaces
    • Related Report
      2024 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Deformations of minimal surfaces and their limits2024

    • Author(s)
      Shoichi Fujimori
    • Organizer
      SGU Special Lectures "Integrabilities in Differential Geometry, and their Applications"
    • Related Report
      2024 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Nonorientable maximal surfaces with one end in the Lorentz-Minkowski 3-space2023

    • Author(s)
      Shoichi Fujimori
    • Organizer
      The 3rd Conference on Surfaces, Analysis, and Numerics
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Genus three embedded doubly periodic minimal surfaces with parallel ends2022

    • Author(s)
      Shoichi Fujimori
    • Organizer
      RIMS Workshop (Type A) Applications of Harmonic Maps and Higgs Bundles to Differential Geometry
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Examples of minimal surfaces in Euclidean 3-space2022

    • Author(s)
      Shoichi Fujimori
    • Organizer
      Discussion meeting on zero mean curvature surfaces in the Lorentz-Minkowski space and related areas
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Higher genus nonorientable maximal surfaces in the Lorentz-Minkowski 3-space2022

    • Author(s)
      Shoichi Fujimori
    • Organizer
      The 7th Japan-China Geometry Conference
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 高種数の向き付け不可能な極大曲面について2022

    • Author(s)
      藤森祥一, 金田伸
    • Organizer
      日本数学会年会
    • Related Report
      2021 Research-status Report
  • [Remarks] 藤森祥一のホームページ

    • URL

      https://home.hiroshima-u.ac.jp/fujimori/index-j.html

    • Related Report
      2024 Annual Research Report
  • [Remarks] 藤森祥一のウェブページ

    • URL

      https://home.hiroshima-u.ac.jp/fujimori/index-j.html

    • Related Report
      2023 Research-status Report 2022 Research-status Report 2021 Research-status Report

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Published: 2021-04-28   Modified: 2026-01-16  

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