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F-singularities and singularities in birational geometry in characteristic zero(Fostering Joint International Research)

Research Project

Project/Area Number 15KK0152
Research Category

Fund for the Promotion of Joint International Research (Fostering Joint International Research)

Allocation TypeMulti-year Fund
Research Field Algebra
Research InstitutionThe University of Tokyo

Principal Investigator

Takagi Shunsuke  東京大学, 大学院数理科学研究科, 教授 (40380670)

Research Collaborator TANAKA Hiromu  東京大学, 大学院数理科学研究科, 准教授 (50724514)
Cascini Paolo  Imperial College London, Department of Mathematics, 教授
Project Period (FY) 2016 – 2018
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥11,310,000 (Direct Cost: ¥8,700,000、Indirect Cost: ¥2,610,000)
KeywordsF特異点 / 大域的F正則多様体 / Fano型多様体 / 判定イデアル / 数値的Q-Gorenstein / 代数幾何学 / F正則特異点 / 特異点の変形 / 対数的Fano多様体 / 正標数 / WO有理特異点
Outline of Final Research Achievements

A projective variety over an algebraically closed field of characteristic zero is said to be of globally F-regular type if its modulo p reduction is globally F-regular for almost all p. In joint work with Paolo Cascini, we discuss a conjecture of Karl Schwede and Karen Smith, which says that a projective variety of globally F-regular type is of Fano type. In particular, we prove that their conjecture holds if the variety is a 3-dimensional smooth projective variety with nef anti-canonical divisor.

Academic Significance and Societal Importance of the Research Achievements

Schwede・Smithの予想はF特異点論と双有理幾何学を結びつける重要な予想であり、この予想が肯定的に解決されれば、F特異点論を用いたFano型多様体の研究が可能になる。Schwede・Smithの予想は2次元の場合に正しいことが知られていたが、高次元の場合についてはほとんど何もわかっていなかった。今回初めて3次元の結果が得られたが、これをきっかけに高次元の研究が加速することが期待される。

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (13 results)

All 2019 2018 2017 Other

All Int'l Joint Research (1 results) Journal Article (3 results) (of which Peer Reviewed: 3 results) Presentation (5 results) (of which Int'l Joint Research: 1 results,  Invited: 5 results) Remarks (2 results) Funded Workshop (2 results)

  • [Int'l Joint Research] Imperial College London(英国)2017

    • Related Report
      2018 Annual Research Report
  • [Journal Article] General hyperplane sections of threefolds in positive characteristic2019

    • Author(s)
      Kenta Sato and Shunsuke Takagi
    • Journal Title

      Journal of the Institute of Mathematics of Jussieu

      Volume: in press

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Finitistic test ideals on numerically Q-Gorenstein varieties2018

    • Author(s)
      Shunsuke Takagi
    • Journal Title

      J. Algebra

      Volume: 印刷中 Pages: 266-279

    • DOI

      10.1016/j.jalgebra.2018.08.003

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] General hyperplane sections of threefolds in positive characteristic2018

    • Author(s)
      Kenta Sato and Shunsuke Takagi
    • Journal Title

      Journal of the Institute of Mathematics of Jussieu

      Volume: 印刷中 Issue: 2 Pages: 647-661

    • DOI

      10.1017/s1474748018000166

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Presentation] 代数多様体の特異点論と正標数の手法2019

    • Author(s)
      高木 俊輔
    • Organizer
      日本数学会2019年度年会
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] On threefolds of globally F-regular type2019

    • Author(s)
      Shunsuke Takagi
    • Organizer
      AMS Spring Central and Western Sectional Meeting, Special Session on Commutative Algebra and its Environs
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] General hyperplane sections of threefolds in positive characteristic2018

    • Author(s)
      Shunsuke Takagi
    • Organizer
      Pure Maths Colloquium, University of Sheffield
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] Vanishing theorems on globally F-regular varieties2018

    • Author(s)
      Shunsuke Takagi
    • Organizer
      Algebraic Geometry Seminar, University of Cambridge
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] General hyperplane sections of threefolds in positive characteristic2017

    • Author(s)
      Shunsuke Takagi
    • Organizer
      The London Geometry and Topology Seminar
    • Related Report
      2017 Research-status Report
    • Invited
  • [Remarks] Shunsuke Takagi

    • URL

      https://www.ms.u-tokyo.ac.jp/~stakagi/

    • Related Report
      2018 Annual Research Report 2017 Research-status Report
  • [Remarks] Shunsuke Takagi

    • URL

      http://www.ms.u-tokyo.ac.jp/~stakagi/

    • Related Report
      2016 Research-status Report
  • [Funded Workshop] London-Tokyo Workshop In Birational Geometry2018

    • Related Report
      2018 Annual Research Report
  • [Funded Workshop] Cambridge-Tokyo Algebraic Geometry workshop 20172017

    • Place of Presentation
      Cambridge大学
    • Year and Date
      2017-03-16
    • Related Report
      2016 Research-status Report

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Published: 2016-10-04   Modified: 2020-03-30  

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