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Arithmetic geometry related to the rigidity of hyperbolic algebraic curves

Research Project

Project/Area Number 18K03239
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) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2019: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Keywords双曲的代数曲線 / 遠アーベル幾何学 / p進タイヒミュラー理論 / 宇宙際タイヒミュラー理論 / 丹後構造 / 固有束 / 双曲的亜曲線 / 混標数局所体 / 準三点基 / 絶対版遠アーベル開基 / 単遠アーベル的復元アルゴリズム / 等分点 / ハッセ・ヴィット不変量 / 可積分接続 / 超特別還元 / 多重双曲的曲線 / 狭義単調減少型多重双曲的曲線 / 遠アーベル開基 / 組み合わせ論的遠アーベル幾何学 / p進Teichmuller理論 / 双曲的通常性 / 剛性
Outline of Final Research Achievements

One important result obtained in this research project is an affirmative solution to the absolute version of the anabelian conjecture for quasi-tripods over fields that belong to a certain wide class of generalized sub-p-adic fields. As an application of this result, one may conclude that an arbitrary smooth algebraic variety over a field that belongs to the wide class of generalized sub-p-adic fields admits an open basis that consists of absolutely anabelian algebraic varieties.
In this research project, as a joint work with Mochizuki, Fesenko, Minamide, and Porowski, a certain explicit Diophantine inequality has been established by refining some portions of inter-universal Teichmuller theory.
Moreover, as a joint work with Mochizuki and Tsujimura, we have established a certain group-theoretic construction of the absolute Galois group of the field of rational numbers from the point of view of combinatorial anabelian geometry.

Academic Significance and Societal Importance of the Research Achievements

遠アーベル幾何学,通常曲線の理論やp進タイヒミュラー理論のいずれも,先行研究は数少なく,本研究で得られた様々な成果には,それら研究領域の今後の研究の指針になり得るものも含まれていると評価している.また,より具体的には,本研究によって,例えば,広いクラスの基礎体の上で定義された任意の非特異代数多様体が遠アーベル多様体による開基を持つこと,その上,その絶対版の成立が明らかになった.基礎体が有理数体の有限生成拡大体である場合のこの問題は,遠アーベル幾何学における古典的な問題の1つである.そのような古典的な問題のより一般的な場合の解決,そして,その絶対版の解決には,充分な学術的意義があると考えられる.

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (25 results)

All 2021 2020 2019 2018 Other

All Journal Article (14 results) (of which Peer Reviewed: 14 results,  Open Access: 13 results) Presentation (5 results) (of which Int'l Joint Research: 5 results,  Invited: 5 results) Remarks (6 results)

  • [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
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Frobenius-Projective Structures on Curves in Positive Characteristic2020

    • Author(s)
      Hoshi Yuichiro
    • Journal Title

      Publications of the Research Institute for Mathematical Sciences

      Volume: 56 Issue: 2 Pages: 401-430

    • DOI

      10.4171/prims/56-2-5

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Reconstruction of profinite graphs from profinite groups of PIPSC-type2020

    • Author(s)
      HOSHI Yuichiro
    • Journal Title

      Hokkaido Mathematical Journal

      Volume: 49 Issue: 3 Pages: 399-430

    • DOI

      10.14492/hokmj/1607936535

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Homotopy sequences for varieties over curves2020

    • Author(s)
      Hoshi Yuichiro
    • Journal Title

      Kobe Journal of Mathematics

      Volume: 37 Pages: 41-66

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] A note on an anabelian open basis for a smooth variety2020

    • Author(s)
      Hoshi Yuichiro
    • Journal Title

      Tohoku Mathematical Journal

      Volume: 72 Issue: 4 Pages: 537-550

    • DOI

      10.2748/tmj.20190917a

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] On the supersingular divisors of nilpotent admissible indigenous bundles2019

    • Author(s)
      Hoshi Yuichiro
    • Journal Title

      Kodai Mathematical Journal

      Volume: 42 Issue: 1 Pages: 1-47

    • DOI

      10.2996/kmj/1552982501

    • NAID

      130007620566

    • ISSN
      0386-5991, 1881-5472
    • Year and Date
      2019-03-18
    • Related Report
      2019 Research-status Report 2018 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] A pro-l version of the congruence subgroup problem for mapping class groups of genus one2019

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

      Journal of Algebra

      Volume: 520 Pages: 1-31

    • DOI

      10.1016/j.jalgebra.2018.10.036

    • Related Report
      2019 Research-status Report 2018 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Mono-anabelian reconstruction of number fields2019

    • Author(s)
      Hoshi Yuichiro
    • Journal Title

      RIMS Kokyuroku Bessatsu

      Volume: B76 Pages: 1-77

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] A note on dormant opers of rank p-1 in characteristic p2019

    • Author(s)
      Hoshi Yuichiro
    • Journal Title

      Nagoya Mathematical Journal

      Volume: 235 Pages: 115-126

    • DOI

      10.1017/nmj.2018.4

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] 宇宙際 Teichmuller 理論入門2019

    • Author(s)
      Hoshi Yuichiro
    • Journal Title

      RIMS Kokyuroku Bessatsu

      Volume: B76 Pages: 79-183

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Topics in the anabelian geometry of mixed-characteristic local fields2019

    • Author(s)
      Hoshi Yuichiro
    • Journal Title

      Hiroshima Mathematical Journal

      Volume: 49 Issue: 3 Pages: 323-398

    • DOI

      10.32917/hmj/1573787035

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Hyperbolic ordinariness of hyperelliptic curves of lower genus in characteristic three2019

    • Author(s)
      Hoshi Yuichiro
    • Journal Title

      Kyushu Journal of Mathematics

      Volume: 73 Pages: 317-335

    • NAID

      130007871389

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] On the pro-p absolute anabelian geometry of proper hyperbolic curves2018

    • Author(s)
      Hoshi Yuichiro
    • Journal Title

      Journal of Mathematical Sciences, The University of Tokyo

      Volume: 25 Pages: 1-34

    • NAID

      120006903157

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Two categorical characterizations of local fields2018

    • Author(s)
      Hoshi Yuichiro
    • Journal Title

      Hiroshima Mathematical Journal

      Volume: 48 Issue: 3 Pages: 253-277

    • DOI

      10.32917/hmj/1544238027

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] The Absolute Anabelian Geometry of Quasi-tripods2021

    • Author(s)
      Hoshi Yuichiro
    • Organizer
      Homotopic and Geometric Galois Theory
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Mono-anabelian Transport in Inter-universal Teichmuller Theory2021

    • Author(s)
      Hoshi Yuichiro
    • Organizer
      Promenade in Inter-universal Teichmuller Theory
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] An Anabelian Open Basis for a Smooth Variety2019

    • Author(s)
      Hoshi Yuichiro
    • Organizer
      Fundamental groups: Geometry and Arithmetic
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] An introduction to nilpotent ordinary indigenous bundles via modular curves2018

    • Author(s)
      Hoshi Yuichiro
    • Organizer
      Witt Vectors, Deformations, and Absolute Geometry
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Nilpotent indigenous bundles in characteristic three2018

    • Author(s)
      Hoshi Yuichiro
    • Organizer
      Witt Vectors, Deformations, and Absolute Geometry
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [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
      2020 Annual Research Report
  • [Remarks] Yuichiro HOSHI's Home Page

    • URL

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

    • Related Report
      2020 Annual Research Report
  • [Remarks] 星 裕一郎 の ホームページ

    • URL

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

    • Related Report
      2019 Research-status Report
  • [Remarks] Yuichiro HOSHI's Home Page

    • URL

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

    • Related Report
      2019 Research-status Report
  • [Remarks] 星裕一郎@京大数理研

    • URL

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

    • Related Report
      2018 Research-status Report
  • [Remarks] Yuichiro HOSHI@RIMS

    • URL

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

    • Related Report
      2018 Research-status Report

URL: 

Published: 2018-04-23   Modified: 2022-01-27  

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