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Geometry of arithmetic varieties and arithmetic positivity

Research Project

Project/Area Number 20K03548
Research Category

Grant-in-Aid for Scientific Research (C)

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

Principal Investigator

Ikoma Hideaki  四天王寺大学, 教育学部, 准教授 (90533638)

Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2023: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2022: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2021: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2020: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Keywords代数幾何学 / アラケロフ幾何学 / 数論的多様体 / 数論的正値性
Outline of Research at the Start

代数多様体上の有理点の研究を行う上で、計量の付いた直線束のノルムの小さい大域切断を考えることが大変重要です。例えばこのような切断は、超越数論における補助関数の役割を果たします。私はこのノルムの小さい切断に、零点集合上の重複度の条件(基底条件)を課した上で、その存在や個数の問題を考えました。本研究の目的は、計量付き直線束と基底条件の組に対して高さ関数を定義し、それを有理点の問題に応用することです。具体的な計算が可能な、曲線の場合やトーリック多様体の場合を確認した後、一般の場合を調べる計画です。

Outline of Final Research Achievements

A central concern in Arakelov geometry is to study the number of small sections of an adelic line bundle. Arithmetic volume function is a birational invariant that counts the numbers of small sections of high powers of an adelic line bundle. The main purpose of this research is to establish in its most general form differentiability of the arithmetic volume function over the cone of big pairs of adelic Cartier divisors and Cartier divisors. In the first year, in a joint work with Huayi Chen, I proposed a construction of arithmetic Okounkov bodies for subfinite linear series. I wrote a book on Faltings's big theorem with Moriwaki and Kawaguchi. In the second year, I published papers on continuity of arithmetic volume function and on differentiability of arithmetic volume function along adelic Cartier divisors. I also published in an arXiv a manuscript on one-sided differentiability of arithmetic volume function at the boundary in special cases.

Academic Significance and Societal Importance of the Research Achievements

代数多様体上の有理点の研究を行う上で、計量の付いた直線束のノルムの小さい大域切断を考えることが大変重要です。例えばこのような切断は、Faltingsの大定理の証明において、超越数論における補助関数の役割を果たしています。私はこのノルムの小さい切断に基底条件を課した上で、その存在や個数の問題を考えました。初年度に新型コロナウイルスが流行し、業務が多忙化したため、計画よりも予定が遅れてしまいましたが、当初の目的であった微分可能性について一般的な証明の方針を得ることはできました。またYuanとZhangによって開多様体上の同程度分布定理が示されたため、その関係についても鋭意研究を進めていきます。

Report

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

    (5 results)

All 2022 2021 2019 Other

All Int'l Joint Research (1 results) Journal Article (1 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (2 results) (of which Int'l Joint Research: 2 results,  Invited: 2 results) Book (1 results)

  • [Int'l Joint Research] IMJ-PRG(フランス)

    • Related Report
      2020 Research-status Report
  • [Journal Article] On subfiniteness of graded linear series2019

    • Author(s)
      Chen Huayi、Ikoma Hideaki
    • Journal Title

      European Journal of Mathematics

      Volume: 6 Issue: 2 Pages: 367-399

    • DOI

      10.1007/s40879-019-00349-0

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Differentiability of the arithmetic volume function for pairs2022

    • Author(s)
      Hideaki Ikoma
    • Organizer
      Intercity Seminar on Arakelov Geometry near Madrid
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Differentiability of the arithmetic volume function for pairs2021

    • Author(s)
      Hideaki Ikoma
    • Organizer
      Arithmetic algebraic geometry and mathematical physics in honor of the 60th birthday of Professor Atsushi Moriwaki
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Book] The Mordell Conjecture: A Complete Proof from Diophantine Geometry2022

    • Author(s)
      Hideaki Ikoma, Shu Kawaguchi, Atsushi Moriwaki
    • Total Pages
      150
    • Publisher
      Cambridge University Press
    • ISBN
      9781108845953
    • Related Report
      2021 Research-status Report

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Published: 2020-04-28   Modified: 2025-01-30  

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