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Research of arithmetic fundamental groups of hyperbolic curves

Research Project

Project/Area Number 20740010
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeSingle-year Grants
Research Field Algebra
Research InstitutionKyoto University

Principal Investigator

HOSHI Yuichiro  Kyoto University, 数理解析研究所, 助教 (50456761)

Project Period (FY) 2008 – 2009
Project Status Completed (Fiscal Year 2009)
Budget Amount *help
¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2009: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2008: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Keywords遠アーベル幾何 / 数論的基本群 / 双曲的曲線 / 配置空間 / 外Galois表現 / 組み合わせ論的カスプ化 / モノドロミー充満 / Galois切断 / 副p切断予想 / tame-blind / truncated Barsotti-Tate群 / 組み合わせ論版Grothendieck予想
Research Abstract

By a joint work with Shinichi Mochizuki, we proved the injectivity portion of the combinatorial cuspidalization; moreover, as an arithmetic application of this injectivity, we obtained the faithfulness of the outer Galois representations associated to hyperbolic curves over number or p-adic local fields. Next, I introduced the notion of monodromic fullness for hyperbolic curves and proved an anabelian conjecture-type result for certain monodromically full hyperbolic curves of genus zero. Finally, I proved that in general, the pro-p section conjecture for hyperbolic curves over number fields, as well as p-adic local fields, cannot be resolved in the affirmative.

Report

(3 results)
  • 2009 Annual Research Report   Final Research Report ( PDF )
  • 2008 Annual Research Report
  • Research Products

    (16 results)

All 2010 2009 2008

All Journal Article (4 results) (of which Peer Reviewed: 4 results) Presentation (12 results)

  • [Journal Article] Absolute anabelian cuspidalizations of configuration spaces of proper hyperbolic curves over finite fields2009

    • Author(s)
      星裕一郎
    • Journal Title

      Publications of the Research Institute for Mathematical Sciences Vol.45

      Pages: 661-744

    • NAID

      110007190374

    • Related Report
      2009 Final Research Report
    • Peer Reviewed
  • [Journal Article] Absolute anabelian cuspidalizations of configuration spaces of proper hyperbolic curves over finite fields2009

    • Author(s)
      星裕一郎
    • Journal Title

      Publications of the Research Institute for Mathematical Sciences 45

      Pages: 661-744

    • NAID

      110007190374

    • Related Report
      2009 Annual Research Report
    • Peer Reviewed
  • [Journal Article] The exactness of the log homotopy sequence2009

    • Author(s)
      星裕一郎
    • Journal Title

      Hiroshima Mathematical Journal 39-1

      Pages: 6-121

    • NAID

      110007014253

    • Related Report
      2008 Annual Research Report
    • Peer Reviewed
  • [Journal Article] On the fundamental groups of log configuration schemes2009

    • Author(s)
      星裕一郎
    • Journal Title

      Mathematical Journal of Okayam University 51

      Pages: 1-26

    • NAID

      120002309380

    • Related Report
      2008 Annual Research Report
    • Peer Reviewed
  • [Presentation] モノドロミー充満な種数0の双曲的曲線の同型類のGalois理論的特徴付け2010

    • Author(s)
      星裕一郎
    • Organizer
      複素幾何と代数幾何の若手研究集会
    • Place of Presentation
      熊本大学
    • Year and Date
      2010-02-18
    • Related Report
      2009 Annual Research Report
  • [Presentation] Existence of nongeometric pro-p Galois sections of hyperbolic curves2010

    • Author(s)
      星裕一郎
    • Organizer
      The arithmetic of fundamental groups
    • Place of Presentation
      ハイデルベルグ大学(ドイツ)
    • Year and Date
      2010-02-11
    • Related Report
      2009 Annual Research Report 2009 Final Research Report
  • [Presentation] Galois-theoretic characterization of isomorphism classes of monodromically full hyperbolic curves of genus zero2010

    • Author(s)
      星裕一郎
    • Organizer
      Torsion of Abelian Schemes and Rational Points on Moduli spaces
    • Place of Presentation
      ボルドー第一大学(フランス)
    • Year and Date
      2010-01-27
    • Related Report
      2009 Final Research Report
  • [Presentation] Galois-theoretic characterization of isomorphism classes of monodromically full hyperbolic curves of genus zero2010

    • Author(s)
      星裕一郎
    • Organizer
      Torsion of Abelian Schemes and Rational Points on Moduli Spaces
    • Place of Presentation
      ボルドー第1大学(フランス)
    • Year and Date
      2010-01-27
    • Related Report
      2009 Annual Research Report
  • [Presentation] On the combinatorial cuspidalizations and the faithfulness of the outer Galois representations of hyperbolic curves (joint work with Shinichi Mochizuki)2009

    • Author(s)
      星裕一郎
    • Organizer
      Anabelian Geometry
    • Place of Presentation
      ケンブリッジ大学(イギリス)
    • Year and Date
      2009-08-27
    • Related Report
      2009 Final Research Report
  • [Presentation] On the combinatorial cuspidalizations and the faithfulness of the outer Galois representations of hyperbolic curves (joint work with Shinichi Mochizuki)2009

    • Author(s)
      星裕一郎
    • Organizer
      Anabelian Geometry
    • Place of Presentation
      ケンブリッジ大学(英国)
    • Year and Date
      2009-08-27
    • Related Report
      2009 Annual Research Report
  • [Presentation] 遠アーベル幾何学について2009

    • Author(s)
      星裕一郎
    • Organizer
      第六回城崎新人セミナー
    • Place of Presentation
      城崎町大会議館
    • Year and Date
      2009-02-18
    • Related Report
      2009 Final Research Report
  • [Presentation] 双曲的曲線に対する組み合わせ論的カスプ化(望月新一氏との共同研究)2009

    • Author(s)
      星裕一郎
    • Organizer
      超平面配置のさまざまな側面
    • Place of Presentation
      神戸大学
    • Year and Date
      2009-02-13
    • Related Report
      2008 Annual Research Report
  • [Presentation] 双曲的曲線の組み合わせ論的カスプ化(望月新一氏との共同研究)2009

    • Author(s)
      星裕一郎
    • Organizer
      超平面配置のさまざまな側面
    • Place of Presentation
      神戸大学
    • Year and Date
      2009-02-12
    • Related Report
      2009 Final Research Report
  • [Presentation] 双曲的曲線の組み合わせ論的カスプ化と外ガロア作用の忠実性(望月新一氏との共同研究)2008

    • Author(s)
      星裕一郎
    • Organizer
      代数的整数論とその周辺
    • Place of Presentation
      京都大学数理解析研究所
    • Year and Date
      2008-12-09
    • Related Report
      2009 Final Research Report
  • [Presentation] 双曲的曲線の組み合わせ論的カスプ化と外ガロア作用の忠実性(望月新一氏との共同研究)2008

    • Author(s)
      星裕一郎
    • Organizer
      代数的整数論とその周辺
    • Place of Presentation
      京都大学
    • Year and Date
      2008-12-09
    • Related Report
      2008 Annual Research Report
  • [Presentation] 遠アーベル幾何学について2008

    • Author(s)
      星裕一郎
    • Organizer
      第6回城崎新人セミナー
    • Place of Presentation
      兵庫県豊岡市城崎町大会議館
    • Year and Date
      2008-02-18
    • Related Report
      2008 Annual Research Report

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Published: 2008-04-01   Modified: 2016-04-21  

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