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Intrinsicity associated to anabelian objects

Research Project

Project/Area Number 21K03162
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 11010:Algebra-related
Research InstitutionKyoto University

Principal Investigator

Hoshi Yuichiro  京都大学, 数理解析研究所, 准教授 (50456761)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2023: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2022: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2021: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Keywords遠アーベル幾何学 / 双曲的代数曲線 / p進タイヒミュラー理論 / 可解閉ガロア拡大 / 内在的ホッジ・テイト性 / モノドロミー充満 / 三点基次数 / 正準持ち上げ / 正準フロベニウス持ち上げ / 遠アーベル予想 / 数体 / p進ガロア表現 / 安定還元 / 四点基 / 単アーベル的構成アルゴリズム / ガロアセクション / 準モノドロミー充満 / 安定束 / ヤコビ和 / 遠アーベル的内在性 / 単遠アーベル的構成アルゴリズム / 代数的基本群
Outline of Research at the Start

本研究は,遠アーベル的な対象に付随する様々な内在性を確立して,そして,それらの間の相互的な関係性を深く理解することを主要な目標としている.より具体的には,以下の三つのテーマを軸として,遠アーベル的な対象に付随する内在性の研究を行う.
(A)代数多様体に対する遠アーベル的内在性の研究
(B)遠アーベル的内在性を活用した単遠アーベル的構成アルゴリズムの研究
(C)遠アーベル的対象に付随する内在性の数論への応用の模索

Outline of Final Research Achievements

The study of geometrically pro-l anabelian geometry for hyperbolic algebraic curves over finite fields, as well as the study of tripod-degrees, may be regarded as one important aspect of this research project. In particular, the study of this research project has established an affirmative solution to the anabelian conjecture for the geometrically pro-l fundamental groups of split tripods over the field of p elements for a suitable pair of prime numbers (p, l). This result is the first nontrivial result in the study of geometrically pro-l anabelian geometry for hyperbolic algebraic curves over finite fields. Moreover, this research project has established many results, for instance, in the study of mono-anabelian/bi-anabelian geometry for solvably closed Galois extensions of number fields and in the study of intrinsic Hodge-Tate-ness of p-adic representations of the absolute Galois groups of mixed-characteristic local fields.

Academic Significance and Societal Importance of the Research Achievements

遠アーベル幾何学を中心的観点とする双曲的代数曲線の研究は,先行研究が数少なく,本研究で得られた様々な成果には,当該研究領域の今後の研究の指針になり得るものも多分に含まれていると評価している.具体的には,本研究によって,例えば,有限体上の特別な双曲的代数曲線の幾何学的副l遠アーベル予想が解決された.この研究は,より一般的な双曲的代数曲線に対する同予想の解決の指針となるであろうと評価している.また,数体の可解閉ガロア拡大に付随するガロア群に対する単アーベル的構成アルゴリズムの確立は,当該分野の自然な「古典的問題」の1つであった.そのような古典的問題の解決には,充分な学術的意義があると考えられる.

Report

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

    (39 results)

All 2024 2023 2022 2021 2020 Other

All Journal Article (18 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 18 results,  Open Access: 1 results) Presentation (17 results) (of which Int'l Joint Research: 9 results,  Invited: 4 results) Book (1 results) Remarks (2 results) Funded Workshop (1 results)

  • [Journal Article] An upper bound on the generic degree of the generalized Verschiebung for rank two stable bundles2024

    • Author(s)
      Hoshi Yuichiro、Wakabayashi Yasuhiro
    • Journal Title

      Journal of Pure and Applied Algebra

      Volume: 228 Issue: 6 Pages: 107605-107605

    • DOI

      10.1016/j.jpaa.2024.107605

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] The Geometry of Hyperbolic Curvoids2023

    • Author(s)
      Hoshi Yuichiro
    • Journal Title

      Publications of the Research Institute for Mathematical Sciences

      Volume: 59 Issue: 1 Pages: 1-55

    • DOI

      10.4171/prims/59-1-1

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] FROBENIUS-AFFINE STRUCTURES AND TANGO CURVES2023

    • Author(s)
      HOSHI YUICHIRO
    • Journal Title

      Nagoya Mathematical Journal

      Volume: 250 Pages: 385-409

    • DOI

      10.1017/nmj.2022.36

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] On the injectivity of the homomorphisms from the automorphism groups of fields to the outer automorphism groups of the absolute Galois groups2023

    • Author(s)
      Hoshi Yuichiro、Tsujimura Shota
    • Journal Title

      Research in Number Theory

      Volume: 9 Issue: 2

    • DOI

      10.1007/s40993-023-00445-x

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Galois-theoretic characterization of geometric isomorphism classes of quasi-monodromically full hyperbolic curves with small numerical invariants2023

    • Author(s)
      Hoshi Yuichiro、Iijima Yu
    • Journal Title

      Journal of Algebra

      Volume: 634 Pages: 480-511

    • DOI

      10.1016/j.jalgebra.2023.07.026

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] A Note on Fields Generated by Jacobi Sums2023

    • Author(s)
      Hoshi Yuichiro
    • Journal Title

      Mathematical Journal of Okayama University

      Volume: 65 Issue: 1 Pages: 117-123

    • DOI

      10.18926/mjou/64004

    • URL

      https://ousar.lib.okayama-u.ac.jp/64004

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Group-theoreticity of numerical invariants and distinguished subgroups of configuration space groups2022

    • Author(s)
      Hoshi Yuichiro、Minamide Arata、Mochizuki Shinichi
    • Journal Title

      Kodai Mathematical Journal

      Volume: 45 Issue: 3 Pages: 295-348

    • DOI

      10.2996/kmj45301

    • ISSN
      0386-5991, 1881-5472
    • Year and Date
      2022-11-30
    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Explicit estimates in inter-universal Teichmüller theory2022

    • Author(s)
      Mochizuki Shinichi、Fesenko Ivan、Hoshi Yuichiro、Minamide Arata、Porowski Wojciech
    • Journal Title

      Kodai Mathematical Journal

      Volume: 45 Issue: 2 Pages: 175-236

    • DOI

      10.2996/kmj45201

    • ISSN
      0386-5991, 1881-5472
    • Year and Date
      2022-06-30
    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] The absolute anabelian geometry of quasi-tripods2022

    • Author(s)
      Hoshi Yuichiro
    • Journal Title

      Kyoto Journal of Mathematics

      Volume: 62 Issue: 1 Pages: 179-224

    • DOI

      10.1215/21562261-2022-0005

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] On the outer automorphism groups of the absolute Galois groups of mixed-characteristic local fields2022

    • Author(s)
      Hoshi Yuichiro、Nishio Yu
    • Journal Title

      Research in Number Theory

      Volume: 8 Issue: 3

    • DOI

      10.1007/s40993-022-00354-5

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Introduction to Mono-anabelian Geometry2022

    • Author(s)
      Hoshi Yuichiro
    • Journal Title

      Publications mathe?matiques de Besanc?on. Alge?bre et the?orie des nombres

      Volume: - Pages: 5-44

    • DOI

      10.5802/pmb.42

    • Related Report
      2022 Research-status Report 2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Mono-anabelian reconstruction of solvably closed Galois extensions of number fields2022

    • Author(s)
      Hoshi Yuichiro
    • Journal Title

      J. Math. Sci. Univ. Tokyo

      Volume: 29 Pages: 257-283

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Ramification of torsion points on a curve with superspecial reduction over an absolutely unramified base2022

    • Author(s)
      Hoshi Yuichiro
    • Journal Title

      Tohoku Mathematical Journal

      Volume: 74 Issue: 4 Pages: 521-534

    • DOI

      10.2748/tmj.20210604

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] A Note on Torsion Points on Ample Divisors on Abelian Varieties2022

    • Author(s)
      Hoshi Yuichiro
    • Journal Title

      Mathematical Journal of Okayama University

      Volume: 64 Issue: 1 Pages: 1-11

    • DOI

      10.18926/mjou/62792

    • NAID

      120007172129

    • URL

      https://ousar.lib.okayama-u.ac.jp/62792

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] 遠アーベル幾何学の進展2022

    • Author(s)
      星裕一郎
    • Journal Title

      数学

      Volume: 74 Pages: 1-30

    • NAID

      40022816334

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] A note on the existence of Tango curves2021

    • Author(s)
      Hoshi Yuichiro
    • Journal Title

      Kodai Mathematical Journal

      Volume: 44 Issue: 1 Pages: 77-80

    • DOI

      10.2996/kmj44105

    • NAID

      130008000458

    • ISSN
      0386-5991, 1881-5472
    • Year and Date
      2021-03-18
    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Pseudo-rigid p-torsion finite flat commutative group schemes2021

    • Author(s)
      Hoshi Yuichiro
    • Journal Title

      Journal of Number Theory

      Volume: 229 Pages: 261-276

    • DOI

      10.1016/j.jnt.2021.04.026

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] On the Geometric Subgroups of the Etale Fundamental Groups of Varieties over Real Closed Fields2020

    • Author(s)
      Yuichiro Hoshi、Takahiro Murotani、Shota Tsujimura
    • Journal Title

      Mathematische Zeitschrift

      Volume: - Issue: 1-2 Pages: 215-229

    • DOI

      10.1007/s00209-020-02593-7

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Presentation] Mono-anabelian Reconstruction of Solvably Closed Galois Extensions of Number Fields2024

    • Author(s)
      Hoshi Yuichiro
    • Organizer
      第 19 回代数・解析・幾何学セミナー
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] On the Geometricity of Adelic Galois Sections of Hyperbolic Curves I2024

    • Author(s)
      星裕一郎
    • Organizer
      Anabelian Geometry in Tokyo 2024
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] On the Geometricity of Adelic Galois Sections of Hyperbolic Curves II2024

    • Author(s)
      星裕一郎
    • Organizer
      Anabelian Geometry in Tokyo 2024
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] Combinatorial anabelian geometry in the absence of group-theoretic cuspidality2022

    • Author(s)
      Hoshi Yuichiro
    • Organizer
      第29回整数論サマースクール“組み合わせ論的遠アーベル幾何学”
    • Related Report
      2022 Research-status Report
  • [Presentation] Partial combinatorial cuspidalization for F-admissible outomorphisms2022

    • Author(s)
      Hoshi Yuichiro
    • Organizer
      第29回整数論サマースクール“組み合わせ論的遠アーベル幾何学”
    • Related Report
      2022 Research-status Report
  • [Presentation] Synchronization of tripods I2022

    • Author(s)
      Hoshi Yuichiro
    • Organizer
      第29回整数論サマースクール“組み合わせ論的遠アーベル幾何学”
    • Related Report
      2022 Research-status Report
  • [Presentation] Synchronization of tripods II2022

    • Author(s)
      Hoshi Yuichiro
    • Organizer
      第29回整数論サマースクール“組み合わせ論的遠アーベル幾何学”
    • Related Report
      2022 Research-status Report
  • [Presentation] Glueability of combinatorial cuspidalizations I2022

    • Author(s)
      Hoshi Yuichiro
    • Organizer
      第29回整数論サマースクール“組み合わせ論的遠アーベル幾何学”
    • Related Report
      2022 Research-status Report
  • [Presentation] Glueability of combinatorial cuspidalizations II2022

    • Author(s)
      Hoshi Yuichiro
    • Organizer
      第29回整数論サマースクール“組み合わせ論的遠アーベル幾何学”
    • Related Report
      2022 Research-status Report
  • [Presentation] The Absolute Anabelian Geometry of Quasi-tripods2021

    • Author(s)
      Hoshi Yuichiro
    • Organizer
      Foundations and Perspectives of Anabelian Geometry
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] A Combinatorial Anabelian Result for Stable Log Curves over Log Points2021

    • Author(s)
      Hoshi Yuichiro
    • Organizer
      Combinatorial Anabelian Geometry and Related Topics
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Combinatorial Anabelian Geometry in the Absence of Group-theoretic Cuspidality2021

    • Author(s)
      Hoshi Yuichiro
    • Organizer
      Combinatorial Anabelian Geometry and Related Topics
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Synchronization of Tripods and Glueability of Combinatorial Cuspidalizations2021

    • Author(s)
      Hoshi Yuichiro
    • Organizer
      Combinatorial Anabelian Geometry and Related Topics
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Applications to the Theory of Tempered Fundamental Groups2021

    • Author(s)
      Hoshi Yuichiro
    • Organizer
      Combinatorial Anabelian Geometry and Related Topics
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Multiradial Representations and Log-volume Estimates2021

    • Author(s)
      Hoshi Yuichiro
    • Organizer
      Inter-universal Teichmuller Theory Summit 2021
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] On the Galois Orbit Version of Inter-universal Teichmuller Theory I: a Progress Report2021

    • Author(s)
      Hoshi Yuichiro
    • Organizer
      Inter-universal Teichmuller Theory Summit 2021
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] On the Galois Orbit Version of Inter-universal Teichmuller Theory II: a Progress Report2021

    • Author(s)
      Hoshi Yuichiro
    • Organizer
      Inter-universal Teichmuller Theory Summit 2021
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Book] Topics surrounding the combinatorial anabelian geometry of hyperbolic curves II-tripods and combinatorial cuspidalization2022

    • Author(s)
      Hoshi Yuichiro、Mochizuki Shinichi
    • Total Pages
      173
    • Publisher
      Springer Singapore
    • ISBN
      9789811910968
    • Related Report
      2022 Research-status Report
  • [Remarks] 星裕一郎のホームページ

    • URL

      https://www.kurims.kyoto-u.ac.jp/~yuichiro/index.html

    • Related Report
      2023 Annual Research Report 2022 Research-status Report 2021 Research-status Report
  • [Remarks] Yuichiro HOSHI's Home Page

    • URL

      https://www.kurims.kyoto-u.ac.jp/~yuichiro/index_e.html

    • Related Report
      2023 Annual Research Report 2022 Research-status Report 2021 Research-status Report
  • [Funded Workshop] 3rd Kyoto-Hefei Workshop on Arithmetic Geometry2021

    • Related Report
      2021 Research-status Report

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Published: 2021-04-28   Modified: 2025-01-30  

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