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Promotion of the study of curves, surfaces and hypersurfaces with singularities from the view point of differential geometry

Research Project

Project/Area Number 26247005
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field Geometry
Research InstitutionTokyo Institute of Technology

Principal Investigator

UMEHARA MASAAKI  東京工業大学, 情報理工学院, 教授 (90193945)

Co-Investigator(Kenkyū-buntansha) 山田 光太郎  東京工業大学, 理学院, 教授 (10221657)
間下 克哉  法政大学, 理工学部, 教授 (50157187)
橋本 英哉  名城大学, 理工学部, 教授 (60218419)
大仁田 義裕  大阪市立大学, 大学院理学研究科, 教授 (90183764)
小磯 深幸  九州大学, マス・フォア・インダストリ研究所, 教授 (10178189)
小池 直之  東京理科大学, 理学部, 教授 (00281410)
Rossman W.F (ROSSMAN W.F)  神戸大学, 理学(系)研究科(研究院), 教授 (50284485)
Project Period (FY) 2014-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥32,890,000 (Direct Cost: ¥25,300,000、Indirect Cost: ¥7,590,000)
Fiscal Year 2018: ¥6,630,000 (Direct Cost: ¥5,100,000、Indirect Cost: ¥1,530,000)
Fiscal Year 2017: ¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Fiscal Year 2016: ¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Fiscal Year 2015: ¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Fiscal Year 2014: ¥7,150,000 (Direct Cost: ¥5,500,000、Indirect Cost: ¥1,650,000)
Keywords微分幾何学 / 曲面 / 超曲面 / 特異点 / 極大曲面 / ガウス曲率 / 半正定値計量 / 曲線 / 波面
Outline of Final Research Achievements

Kossowski metrics characterize the singularities appeared on wave fronts. We (the head investigator and his research group) investigated global properties of them. In particular, we showed that Each Kossowski metric induces a unique coherent tangent bundle. Using this, two Gauss-Bonnet type formulas were obtained. Also, we showed the existence of four distinct cuspidal edges along a given space curve with the same first fundamental form in Euclidean 3-space. On the other hand, using analytic extension formula along fold singularities, we construct several families of real analytic entire zero-mean curvature graphs of mixed type in Lorentz-Minkowski 3-space.

Academic Significance and Societal Importance of the Research Achievements

本研究は,ここ数年の研究代表者の特異点をもつ曲線・曲面の研究の 継続・発展である.特異点論では従来,主に特異点の微分位相幾何学的な性質を研究してきましたが,本研究は「特異点にも曲がり具合を測る新たな不変量を導入し,特異点の微分幾何学的な解明」を目標としております.研究代表者等の研究を契機に,最近では特異点の研究者との研究交流も頻繁になされるようになり,今後,研究が進展すれば,幾何とトポロジーに新しい分野をもたらす可能性があり,国内外の関連する分野の研究者に大きな活力を与えると思われます.

Report

(6 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Annual Research Report
  • 2016 Annual Research Report
  • 2015 Annual Research Report
  • 2014 Annual Research Report
  • Research Products

    (36 results)

All 2019 2018 2017 2016 2015 2014 2013

All Journal Article (18 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 17 results,  Open Access: 6 results,  Acknowledgement Compliant: 9 results) Presentation (16 results) (of which Int'l Joint Research: 2 results,  Invited: 9 results) Book (1 results) Funded Workshop (1 results)

  • [Journal Article] Analytic extension of exceptional constant mean curvature  one catenoids in de Sitter 3-space2019

    • Author(s)
      S. Fujimori,Y. Kawakami, M. Kokubu,W. Rossman, M. Umehara, K. Yamada
    • Journal Title

      Math. J. Okayama Univ.

      Volume: 印刷中

    • NAID

      120006778830

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Hypersurfaces with light-like points in a Lorentzian manifold2019

    • Author(s)
      M. Umehara, K. Yamada
    • Journal Title

      Journal of Goemetric Analysis

      Volume: 印刷中 Issue: 4 Pages: 1-33

    • DOI

      10.1007/s12220-018-00118-7

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Isometric realization of cross caps as formal power series and its applications2019

    • Author(s)
      HONDA Atsufumi、NAOKAWA Kosuke、UMEHARA Masaaki、YAMADA Kotaro
    • Journal Title

      Hokkaido Mathematical Journal

      Volume: 48 Issue: 1 Pages: 1-44

    • DOI

      10.14492/hokmj/1550480642

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Surfaces with light-like points in Lorentz-Minkowski 3-space with applications2018

    • Author(s)
      Masaaki Umehara, Kotaro Yamada
    • Journal Title

      Springer Proceedings of Mathematics and Statics

      Volume: 211 Pages: 253-273

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 特異点の微分幾何学ー3次元時空の極大曲面をテーマにしてー2018

    • Author(s)
      梅原雅顕
    • Journal Title

      応用数理

      Volume: 28 Pages: 86-89

    • NAID

      130007491674

    • Related Report
      2018 Annual Research Report
  • [Journal Article] Isometric realization of cross caps as formal power series and its applications2018

    • Author(s)
      A. Honda, K. Naokawa, M. Umehara, K. Yamada
    • Journal Title

      Hokkaido Mathmatical Journal

      Volume: 印刷中

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Analytic extension of Jorge-Meeks type maximal surfaces in Lorentz-Minkowski 3-space2017

    • Author(s)
      S.Fujimori, Y. Kawakami, M. Kokubu, W. Rossman, M. Umehara, K. Yamada
    • Journal Title

      Osaka Journal of Mathematics

      Volume: 54 Pages: 249-272

    • NAID

      120006312701

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Quadrics and Scherk towers2017

    • Author(s)
      Fujimori S.、Hertrich-Jeromin U.、Kokubu M.、Umehara M.、Yamada K.
    • Journal Title

      Monatshefte f?r Mathematik

      Volume: - Issue: 2 Pages: 249-279

    • DOI

      10.1007/s00605-017-1075-5

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] An index formula for a bundle homomorphism of the tangent bundle into a vector bundle of the same rank, and its applications2017

    • Author(s)
      K. Saji, M. Umehara and K. Yamada
    • Journal Title

      Journal of the Mathematical Society of Japan

      Volume: 69 Issue: 1 Pages: 417-457

    • DOI

      10.2969/jmsj/06910417

    • NAID

      130005310476

    • ISSN
      0025-5645, 1881-1167, 1881-2333
    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Analytic extension of Jorge-Meeks type maximal surfaces in Lorentz-Minkowski 3-space2017

    • Author(s)
      S. Fujimori, Y. Kawakami, M. Kokubu, W. Rossman, M. Umehara, K. Yamada
    • Journal Title

      Osaka Journal of Mathematics

      Volume: 印刷中

    • NAID

      120006312701

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] C^1-umbilics with arbitrarily high indices2017

    • Author(s)
      N. Ando, T. Fujiyama and M. Umehara
    • Journal Title

      Pasific Journal of Mathematics

      Volume: 288 Issue: 1 Pages: 1-27

    • DOI

      10.2140/pjm.2017.288.1

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Mixed type surfaces with bounded mean curvature in 3-dimensional space-times2017

    • Author(s)
      A. Honda, M. Koiso, M. Kokubu, M. Umehara and Kotaro Yamada
    • Journal Title

      Diff. Geom. and its Appl.

      Volume: 52 Pages: 64-77

    • DOI

      10.1016/j.difgeo.2017.03.009

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] Entite zero-mean curvature graphs of mixed type in Lorents-Minkowski 3-space2016

    • Author(s)
      S. Fujimori, Y. Kawakami, M. Kokubu, W. Rossman, M. Umehara, K. Yamada
    • Journal Title

      Quart. J. Math.

      Volume: 67 Pages: 1-37

    • DOI

      10.1093/qmath/haw038

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Isometric deformations of cuspidal edges2016

    • Author(s)
      K. Naokawa, M. Umehara, and K. Yamada
    • Journal Title

      Tohoku Math. J.

      Volume: 68

    • NAID

      130008106069

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Intrinsic properties of surfaces with singularities2015

    • Author(s)
      M. Hasegawa, A. Honda, K. Naokawa, K. Saji, M. Umehara, K. Yamada
    • Journal Title

      International Journal of Mathatematics

      Volume: 26 Issue: 04 Pages: 1-34

    • DOI

      10.1142/s0129167x1540008x

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] Zero mean curvature surfaces in Lorentz-Minkowski 3-space and 2-dimensional fluid mechanics2015

    • Author(s)
      S. Fujimori, Y. W. Kim, S.-E. Koh, W. Rossman, H. Shin, M. Umehara,K. Yamada and S.-D. Yang
    • Journal Title

      Math. J. Okayama Univ.

      Volume: 57

    • NAID

      120005525349

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] Zero mean curvature surfaces in Lorentz-Minkowski 3-space which change type across a light-like line2015

    • Author(s)
      S. Fujimori, Y. W. Kim, S.-E. Koh, W. Rossman, H. Shin, M. Umehara, K. Yamada and S.-D. Yang
    • Journal Title

      Osaka J. Math.

      Volume: 52

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] Intrinsic invariants of cross caps Selecta Mathematica2013

    • Author(s)
      Masaru Hasegawa, Atsufumi Honda, Kosuke Naokawa, Masaaki Umehara and Kotaro Yamada
    • Journal Title

      Online First

      Volume: 20130730 Issue: 3 Pages: 769-785

    • DOI

      10.1007/s00029-013-0134-6

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] 流体力学的双対性を用いた時空の極大曲面に対する Bernstein 型の定理の拡張について2019

    • Author(s)
      赤嶺新太郎,梅原雅顕,山田光太郎
    • Organizer
      日本数学会2019年度年会(於:東京工業大学)
    • Related Report
      2018 Annual Research Report
  • [Presentation] 3次元球面の平坦トーラスの外的直径について2019

    • Author(s)
      梅原雅顕
    • Organizer
      名城研究集会「多様体上の種々の幾何構造の融合」(於:名城大学)
    • Related Report
      2018 Annual Research Report
  • [Presentation] Hypersurfaces with light-like points in Lorentzian manifolds2018

    • Author(s)
      梅原雅顕
    • Organizer
      15th International Workshop on Real and Complex Singularities(於:ブラジル,サンパウロ大学・サンカルロス校)
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] Constant Mean Curvature Hypersurfaces with light-like points in Lorentzian manifolds2018

    • Author(s)
      梅原雅顕
    • Organizer
      Geometric shape generation (於:ウィーン工科大)
    • Related Report
      2018 Annual Research Report
  • [Presentation] 時空の極大曲面とEuclid空間の極小曲面の流体力学的双対性とその応用2018

    • Author(s)
      梅原雅顕
    • Organizer
      部分多様体論・湯沢2018(於:湯沢グランドホテル)
    • Related Report
      2018 Annual Research Report
  • [Presentation] 時空の平均曲率一定曲面上の光的な点における直線定理2018

    • Author(s)
      梅原雅顕
    • Organizer
      福岡大学微分幾何研究会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Maximal surfaces in Lorentz-Minkowski-space containing light-like lines2018

    • Author(s)
      梅原 雅顕
    • Organizer
      泉屋周一先生退職記念研究集会
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Surfaces with light-like points in Lorentz-Minkowski 3-space2018

    • Author(s)
      梅原 雅顕
    • Organizer
      International workshop "Geometry of Submanifolds and Integrable System"
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 特異点の微分幾何学「3次元時空の極大曲面をテーマにして」2017

    • Author(s)
      梅原 雅顕
    • Organizer
      日本応用数理学会2017年度 年会・総合講演
    • Related Report
      2017 Annual Research Report
    • Invited
  • [Presentation] 3次元時空の極大曲面の解析的延長について2017

    • Author(s)
      梅原 雅顕
    • Organizer
      北海道大学・数学教室談話会
    • Place of Presentation
      北海道大学
    • Related Report
      2016 Annual Research Report
    • Invited
  • [Presentation] 特異点をもつ曲面の幾何学2016

    • Author(s)
      梅原 雅顕
    • Organizer
      第63回幾何学シンポジウム
    • Place of Presentation
      岡山大学・理学部
    • Related Report
      2016 Annual Research Report
    • Invited
  • [Presentation] Indices of isolated umbilics on surfaces2015

    • Author(s)
      梅原 雅顕
    • Organizer
      Geometric Analysis in Geometery and Topology 2015
    • Place of Presentation
      東京理科大学・森戸記念館
    • Year and Date
      2015-11-15
    • Related Report
      2015 Annual Research Report
    • Invited
  • [Presentation] 曲面の臍点の指数について2015

    • Author(s)
      梅原 雅顕
    • Organizer
      福岡大学微分幾何研究会
    • Place of Presentation
      福岡大学セミナーハウス
    • Year and Date
      2015-11-01
    • Related Report
      2015 Annual Research Report
    • Invited
  • [Presentation] 半正定値計量と曲面の特異点2014

    • Author(s)
      梅原 雅顕
    • Organizer
      部分多様体論・湯沢2014
    • Place of Presentation
      湯沢グランドホテル
    • Year and Date
      2014-11-21
    • Related Report
      2014 Annual Research Report
    • Invited
  • [Presentation] 特異点をもつ曲面の等長変形について2014

    • Author(s)
      梅原 雅顕
    • Organizer
      広島幾何学研究集会2014
    • Place of Presentation
      広島大学理学部
    • Year and Date
      2014-10-10
    • Related Report
      2014 Annual Research Report
    • Invited
  • [Presentation] Geometry of Surfaces with singularities2014

    • Author(s)
      梅原 雅顕
    • Organizer
      微分幾何学国際研究集会Transformations and Singularities
    • Place of Presentation
      ウィーン工科大学
    • Year and Date
      2014-09-17
    • Related Report
      2014 Annual Research Report
    • Invited
  • [Book] 特異点をもつ曲線と曲面の微分幾何学2017

    • Author(s)
      梅原 雅顕・山田光太郎・佐治 健太郎
    • Total Pages
      319
    • Publisher
      丸善出版
    • ISBN
      9784621302156
    • Related Report
      2017 Annual Research Report
  • [Funded Workshop] Japan-Austria Joint Workshop Transformations and Singularities2016

    • Place of Presentation
      東京工業大学・大岡山キャンパス
    • Year and Date
      2016-02-19
    • Related Report
      2015 Annual Research Report

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Published: 2014-04-04   Modified: 2020-03-30  

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