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Development of anabelian geometry for local fields

Research Project

Project/Area Number 20K14285
Research Category

Grant-in-Aid for Early-Career Scientists

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

Principal Investigator

Minamide Arata  京都大学, 数理解析研究所, 特定助教 (60802717)

Project Period (FY) 2020-04-01 – 2025-03-31
Project Status Completed (Fiscal Year 2024)
Budget Amount *help
¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2023: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2022: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2021: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2020: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Keywords遠アーベル幾何 / 完備離散付値体 / スリム性 / エラスティック性 / 強非分解性 / 強内的非分解性 / 単遠アーベル幾何 / 宇宙際タイヒミューラー理論 / 副有限群 / ヘンゼル離散付値体 / 絶対ガロア群 / 準有限体 / グロタンディーク・タイヒミューラー群 / 連正規閉部分群 / アルティン・シュライアー理論 / 単遠アーベル的復元アルゴリズム / 遠アーベル幾何学 / 局所体 / 単遠アーベル幾何学
Outline of Research at the Start

数論に現れる代表的な体として、数体と局所体がある。数体の場合、その絶対ガロア群が、元の数体の構造を完全に決定することが知られている。(いわゆる、ノイキルヒ・内田の定理。)一方、局所体の場合、一般にこのような現象が成り立たないことが知られている。
従って、局所体の場合、「その絶対ガロア群が、元の局所体の構造をどれだけ知っているか」という問いは非常に興味深い問題である。実際、このような問いについて、これまでに様々な研究がなされてきた。
本研究では、(1) 群論的性質の解析、(2) 単遠アーベル幾何学 の視点から、先行研究の更なる発展を目指す。

Outline of Final Research Achievements

(1)We introduced the notion of strong internal indecomposability, which is a stronger property than both slimness and strong indecomposability. (2)We proved that the absolute Galois groups of complete discrete valuation fields of residue characteristic p>0 (which may be regarded as generalizations of local fields) and their almost pro-p-maximal quotients satisfy elasticity and strong internal indecomposability. We also established a ``subnormal version" of this result. (3)We generalized representative results in mono-anabelian geometry for p-adic local fields to the case of mixed-characteristic complete discrete valuation fields whose residue fields are infinite and satisfy certain finiteness conditions. (4)We proved that the outomorphism groups of nonabelian topologically finitely generated free profinite groups satisfy strong indecomposability. (5)We established a ``\mu_6-version" of inter-universal Teichmuller theory. As an application, we obtained explicit Diophantine inequalities.

Academic Significance and Societal Importance of the Research Achievements

本研究で導入した強内的非分解性には、強非分解性と比較して、「逆極限を取る操作と相性が良い」という利点がある。この利点を活用することで、従来直接強非分解性を確認することが難しかった副有限群についても、(より強い性質である)強内的非分解性を確認することが可能になった。現在、この性質の遠アーベル幾何への応用についても研究を進めており、今後大きな発展の余地があると期待している。また、局所体に対する代表的な単遠アーベル幾何的結果を(特別な)剰余無限な完備離散付値体のクラスの場合に一般化できたこと、そして、遠アーベル幾何の副有限群論・数論幾何への応用に関する新たな結果が得られたことも意義深いと考えている。

Report

(6 results)
  • 2024 Annual Research Report   Final Research Report ( PDF )
  • 2023 Research-status Report
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (37 results)

All 2024 2023 2022 2021 2020 Other

All Int'l Joint Research (1 results) Journal Article (6 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 6 results,  Open Access: 1 results) Presentation (30 results) (of which Int'l Joint Research: 19 results,  Invited: 25 results)

  • [Int'l Joint Research] University of Nottingham(英国)

    • Related Report
      2020 Research-status Report
  • [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 automorphism groups of the profinite braid groups2022

    • Author(s)
      Minamide Arata、Nakamura Hiroaki
    • Journal Title

      American Journal of Mathematics

      Volume: 144 Issue: 5 Pages: 1159-1176

    • DOI

      10.1353/ajm.2022.0034

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Internal indecomposability of profinite groups2022

    • Author(s)
      Minamide Arata、Tsujimura Shota
    • Journal Title

      Advances in Mathematics

      Volume: 409 Pages: 108689-108689

    • DOI

      10.1016/j.aim.2022.108689

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Anabelian group-theoretic properties of the absolute Galois groups of discrete valuation fields2022

    • Author(s)
      Minamide Arata、Tsujimura Shota
    • Journal Title

      Journal of Number Theory

      Volume: - Pages: 298-334

    • DOI

      10.1016/j.jnt.2021.12.006

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] グロタンディーク・タイヒミューラー群と関連したある直積分解について2020

    • Author(s)
      Arata Minamide
    • Journal Title

      RIMS Kokyuroku Bessatsu

      Volume: B83 Pages: 195-203

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Etale fundamental groups2024

    • Author(s)
      Arata Minamide
    • Organizer
      Introductory Talks on Anabelian Geometry and the IUT Theory
    • Related Report
      2024 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Anabelian geometry for hyperbolic curves2024

    • Author(s)
      Arata Minamide
    • Organizer
      Introductory Talks on Anabelian Geometry and the IUT Theory
    • Related Report
      2024 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Anabelian geometry for p-adic local fields2024

    • Author(s)
      Arata Minamide
    • Organizer
      Introductory Talks on Anabelian Geometry and the IUT Theory
    • Related Report
      2024 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Introduction to inter-universal Teichmuller theory2024

    • Author(s)
      Arata Minamide
    • Organizer
      Introductory Talks on Anabelian Geometry and the IUT Theory
    • Related Report
      2024 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 遠アーベル幾何の副有限群論への応用について2024

    • Author(s)
      南出 新
    • Organizer
      東京電機大学数学講演会
    • Related Report
      2024 Annual Research Report
    • Invited
  • [Presentation] On the essential logical structure of inter-universal Teichmuller theory I2024

    • Author(s)
      南出 新
    • Organizer
      2024早稲田整数論研究集会
    • Related Report
      2023 Research-status Report
    • Invited
  • [Presentation] On the essential logical structure of inter-universal Teichmuller theory II2024

    • Author(s)
      南出 新
    • Organizer
      2024早稲田整数論研究集会
    • Related Report
      2023 Research-status Report
    • Invited
  • [Presentation] On the essential logical structure of inter-universal Teichmuller theory III2024

    • Author(s)
      南出 新
    • Organizer
      2024早稲田整数論研究集会
    • Related Report
      2023 Research-status Report
    • Invited
  • [Presentation] On the strong indecomposability of the Grothendieck-Teichmuller group2023

    • Author(s)
      Arata Minamide
    • Organizer
      Lille Arithmetic Homotopy and Galois Theory Day 2023
    • Related Report
      2023 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] The injectivity portion of combinatorial cuspidalization for FC-admissible outer automorphisms I2022

    • Author(s)
      南出 新
    • Organizer
      2022年度(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 injectivity portion of combinatorial cuspidalization for FC-admissible outer automorphisms II2022

    • Author(s)
      南出 新
    • Organizer
      2022年度(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] A combinatorial version of the Grothendieck Conjecture for outer representations of NN-type2022

    • Author(s)
      南出 新
    • Organizer
      2022年度(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 surjectivity portion of combinatorial cuspidalization for FC-admissible outer automorphisms2022

    • Author(s)
      南出 新
    • Organizer
      2022年度(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 Grothendieck-Teichmuller group as an open subgroup of the outer automorphism group of the etale fundamental group of a configuration space2022

    • Author(s)
      南出 新
    • Organizer
      2022年度(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] 副有限組紐群の外部自己同型群について2022

    • Author(s)
      南出 新
    • Organizer
      京都大学数学教室談話会
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] The Grothendieck-Teichmuller group and the outer automorphism groups of the profinite braid groups2021

    • Author(s)
      Minamide Arata
    • Organizer
      Foundations and Perspectives of Anabelian Geometry
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] The injectivity portion of combinatorial cuspidalization for FC-admissible outer automorphisms I2021

    • Author(s)
      Minamide Arata
    • Organizer
      Combinatorial Anabelian Geometry and Related Topics
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] The injectivity portion of combinatorial cuspidalization for FC-admissible outer automorphisms II2021

    • Author(s)
      Minamide Arata
    • Organizer
      Combinatorial Anabelian Geometry and Related Topics
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] The Grothendieck-Teichmuller group as an open subgroup of the outer automorphism group of the etale fundamental group of a configuration space2021

    • Author(s)
      Minamide Arata
    • Organizer
      Combinatorial Anabelian Geometry and Related Topics
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Log-Theta Lattice: Symmetries and Indeterminacies I2021

    • Author(s)
      Minamide Arata
    • Organizer
      Invitation to Inter-universal Teichmuller Theory
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Log-Theta Lattice: Symmetries and Indeterminacies II2021

    • Author(s)
      Minamide Arata
    • Organizer
      Invitation to Inter-universal Teichmuller Theory
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Log-Theta Lattice: Symmetries and Indeterminacies III2021

    • Author(s)
      Minamide Arata
    • Organizer
      Invitation to Inter-universal Teichmuller Theory
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Explicit Estimates in Inter-universal Teichmuller Theory I2021

    • Author(s)
      Minamide Arata
    • Organizer
      Inter-universal Teichmuller Theory Summit 2021
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Explicit Estimates in Inter-universal Teichmuller Theory II2021

    • Author(s)
      Minamide Arata
    • Organizer
      Inter-universal Teichmuller Theory Summit 2021
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Anabelian group-theoretic properties of the absolute Galois groups of Henselian discrete valuation fields2021

    • Author(s)
      Minamide Arata
    • Organizer
      3rd Kyoto-Hefei Workshop on Arithmetic Geometry
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 宇宙際タイヒミューラー理論における明示的評価2021

    • Author(s)
      南出 新
    • Organizer
      代数的整数論とその周辺 2021
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] Log-Theta Lattice: Symmetries and Indeterminacies2021

    • Author(s)
      Arata Minamide
    • Organizer
      Promenade in Inter-universal Teichmuller Theory
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] The outer automorphism groups of the profinite braid groups2021

    • Author(s)
      Arata Minamide
    • Organizer
      Homotopic and Geometric Galois Theory
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Explicit Estimates in Inter-universal Teichmuller Theory2021

    • Author(s)
      Arata Minamide
    • Organizer
      Promenade in Inter-universal Teichmuller Theory
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Hodge Theaters2020

    • Author(s)
      Arata Minamide
    • Organizer
      Promenade in Inter-universal Teichmuller Theory
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research / Invited

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Published: 2020-04-28   Modified: 2026-01-16  

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