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Torelli-type problem for singular algebraic curves

Research Project

Project/Area Number 15K13426
Research Category

Grant-in-Aid for Challenging Exploratory Research

Allocation TypeMulti-year Fund
Research Field Algebra
Research InstitutionOsaka University

Principal Investigator

Konno Kazuhiro  大阪大学, 理学研究科, 教授 (10186869)

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: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2016: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2015: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Keywords特異曲線 / トレリ型問題 / 周期写像 / 特異可約曲線 / トレリの定理 / 可約曲線 / 微小変形 / 特異代数曲線 / モノドロミー / ホッジ構造
Outline of Final Research Achievements

I studied the Torelli-type problem for numerically connected effective divisors on a non-singular complex projective surface. Due to its difficulty, I could not obtain a definitive result. I could show some new results during the course of the study, however, on (1) canonical base points of smooth multiple fibers, (2) the behavior of the canonical map for a not necessarily numerically 3-connected curves, or (3) the connectivity of the parameter space for deformations of normally minimal models of singular fibers in a pencil of algebraic curves.

Academic Significance and Societal Importance of the Research Achievements

非特異代数曲面がもつファイバー構造の特異ファイバーに関する新たな知見が得られた.非特異曲線が重複している場合には,その標準線形系の基点の現れ方がゴナリティー(射影直線への最小写像度)によって著しくことなることが判明した.また,より組み合わせ論的に複雑な曲線の標準写像についても部分曲線の振る舞いを解明できる可能性を提示できた.また,各成分の重複度や種数を固定したとき,ファイバーの等特異な変形を記述する空間が連結であることが示されるなど,今後の当該分野の研究発展に繋がる基礎的な成果を挙げることができた.

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

    (14 results)

All 2018 2017 2016 2015

All Journal Article (5 results) (of which Int'l Joint Research: 4 results,  Peer Reviewed: 5 results) Presentation (6 results) (of which Int'l Joint Research: 1 results,  Invited: 6 results) Book (2 results) Funded Workshop (1 results)

  • [Journal Article] Sextic curves with six double points on a conic2017

    • Author(s)
      K. Konno and E. Stagnaro
    • Journal Title

      Methods and Applications of Analysis

      Volume: 24 Issue: 2 Pages: 295-302

    • DOI

      10.4310/maa.2017.v24.n2.a6

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Normal canonical surfaces in projective 3-space2017

    • Author(s)
      K. Konno
    • Journal Title

      International Journal of Mathematics

      Volume: 28 Issue: 10 Pages: 1750076-1750076

    • DOI

      10.1142/s0129167x17500768

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Certain normal surface singularities of general type2017

    • Author(s)
      Konno Kazuhiro
    • Journal Title

      Methods and Applications of Analysis

      Volume: 24 Issue: 1 Pages: 71-97

    • DOI

      10.4310/maa.2017.v24.n1.a6

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Certain normal surface singularities of general type2017

    • Author(s)
      Kazuhiro Konno
    • Journal Title

      Methods and Applications of Analysis

      Volume: 印刷中

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] A note on smooth multiple fibers in pencils of algebraic curves2015

    • Author(s)
      Kazuhiro Konno
    • Journal Title

      Nihonkai Math. J.

      Volume: 26 Pages: 103-120

    • Related Report
      2015 Research-status Report
    • Peer Reviewed
  • [Presentation] Normal surface singularities and Yau cycles2018

    • Author(s)
      今野一宏
    • Organizer
      第5回代数幾何学研究集会-宇部-
    • Related Report
      2017 Research-status Report
    • Invited
  • [Presentation] Normal surface singularities and Yau cycles2017

    • Author(s)
      K. Konno
    • Organizer
      Algebraic Geometry Seminar, Dalian Universiry of Technology
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Canonical surfaces of degree 3n-3 in projective n-space2016

    • Author(s)
      Kazuhiro Konno
    • Organizer
      Algebraic Geometry Seminar
    • Place of Presentation
      East China Normal University
    • Year and Date
      2016-09-06
    • Related Report
      2016 Research-status Report
    • Invited
  • [Presentation] Canonical surfaces of degree 3n-3 in projective n-space2016

    • Author(s)
      今野一宏
    • Organizer
      第13回代数曲面ワークショップ
    • Place of Presentation
      高知工科大学
    • Year and Date
      2016-07-02
    • Related Report
      2016 Research-status Report
    • Invited
  • [Presentation] 平面6次曲線と標準曲面2016

    • Author(s)
      今野一宏
    • Organizer
      第11回 代数・解析・幾何学セミナー
    • Place of Presentation
      鹿児島大学理学部
    • Year and Date
      2016-02-15
    • Related Report
      2015 Research-status Report
    • Invited
  • [Presentation] 一般型代数曲面の多重標準写像と標準環2015

    • Author(s)
      今野一宏
    • Organizer
      第60回代数学シンポジウム
    • Place of Presentation
      静岡大学理学部
    • Year and Date
      2015-09-01
    • Related Report
      2015 Research-status Report
    • Invited
  • [Book] 平面代数曲線のはなし2017

    • Author(s)
      今野一宏
    • Total Pages
      170
    • Publisher
      内田老鶴圃
    • Related Report
      2016 Research-status Report
  • [Book] リーマン面と代数曲線2015

    • Author(s)
      今野一宏
    • Total Pages
      272
    • Publisher
      共立出版
    • Related Report
      2015 Research-status Report
  • [Funded Workshop] Branched coverings, Degenerations and Related Topics 20172017

    • Place of Presentation
      東北学院大学工学部
    • Year and Date
      2017-03-07
    • Related Report
      2016 Research-status Report

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Published: 2015-04-16   Modified: 2020-03-30  

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