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Affine fibrations on algebraic varieties and algebraic group actions

Research Project

Project/Area Number 15K04831
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Algebra
Research InstitutionKwansei Gakuin University

Principal Investigator

MASUDA Kayo  関西学院大学, 理工学部, 教授 (40280416)

Co-Investigator(Kenkyū-buntansha) 宮西 正宜  関西学院大学, 特定プロジェクト研究センター, 客員研究員 (80025311)
Research Collaborator GURJAR Rajendra. V.  
RUSSELL Peter  
Project Period (FY) 2015-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2017: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2015: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Keywordsアファインファイブレーション / 加法群の作用 / ユニポテント群の作用 / 加法群の代数的作用 / 局所べき零微分 / アフィンファイブレーション / 消去問題 / 局所冪零微分 / factorially closed
Outline of Final Research Achievements

We worked on the affine fibration structures on affine algebraic varieties obtained as the quotient morphism by the algebraic group actions of the additive or unipotent groups. We succeeded to some extent in describing the fibration structure such as the singular fibers when the variety is nonsingular and factorial. Especially when the variety is a threefold, the structure can be described to a great extent.

Academic Significance and Societal Importance of the Research Achievements

アファイン空間は代数幾何学におけるもっとも基本的かつ重要な対象であるにもかかわらず,その代数幾何学的本質が十分わかっているとは言い難い.実際,アファイン空間上の代数群の作用,特に加法群などのユニポテント群の作用がどのようなものかは,3次元以上の高次元の場合はよくわかっていない.本研究の成果は,アファイン空間を含むようなあるクラスの高次元アファイン代数多様体の代数幾何学的構造の解明につながるものである.

Report

(5 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • 2015 Research-status Report
  • Research Products

    (32 results)

All 2019 2018 2017 2016 2015 Other

All Int'l Joint Research (5 results) Journal Article (9 results) (of which Int'l Joint Research: 8 results,  Peer Reviewed: 8 results,  Open Access: 2 results,  Acknowledgement Compliant: 5 results) Presentation (12 results) (of which Int'l Joint Research: 11 results,  Invited: 12 results) Book (1 results) Remarks (4 results) Funded Workshop (1 results)

  • [Int'l Joint Research] Indian Institute of Technology(インド)

    • Related Report
      2018 Annual Research Report
  • [Int'l Joint Research] McGill University(カナダ)

    • Related Report
      2018 Annual Research Report
  • [Int'l Joint Research] Tata Institute of Fundamental Research(インド)

    • Related Report
      2017 Research-status Report
  • [Int'l Joint Research] McGill University(カナダ)

    • Related Report
      2017 Research-status Report
  • [Int'l Joint Research] Warsaw University(ポーランド)

    • Related Report
      2017 Research-status Report
  • [Journal Article] Affine space fibrations2018

    • Author(s)
      R.V. Gurjar, K. Masuda, M. Miyanishi
    • Journal Title

      Oberwolfach Preprints

      Volume: 19

    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Journal Article] Affine threefolds admitting Ga-actions2018

    • Author(s)
      Gurjar R. V.、Koras M.、Masuda K.、Miyanishi M.、Russell P.
    • Journal Title

      Mathematische Annallen

      Volume: - Issue: 3-4 Pages: 1-26

    • DOI

      10.1007/s00208-017-1622-3

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Unipotent group actions on projective varieties2017

    • Author(s)
      R. V. Gurjar, K. Masuda, M. Miyanishi
    • Journal Title

      Advanced Studies in Pure Mathematics

      Volume: 75 Pages: 119-162

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Families of hypersurfaces with noncancellation property2017

    • Author(s)
      K. Masuda
    • Journal Title

      Proceedings of American Mathematical Society

      Volume: 145 Issue: 4 Pages: 1439-1452

    • DOI

      10.1090/proc/13489

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Wild Z/pZ-actions on algebraic surfaces2017

    • Author(s)
      宮西正宜
    • Journal Title

      Journal of Algebras

      Volume: 477 Pages: 360-389

    • DOI

      10.1016/j.jalgebra.2016.12.025

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Unipotent group actions on projective varieties2017

    • Author(s)
      R.V.Gurjar, K. Masuda, M. Miyanishi
    • Journal Title

      Advanced Studies in Pure Mathematics

      Volume: 未定

    • Related Report
      2015 Research-status Report
    • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Pure subrings of commutative rings2016

    • Author(s)
      宮西正宜
    • Journal Title

      Nagoya Mathematical Journal

      Volume: 221 Issue: 1 Pages: 33-68

    • DOI

      10.1017/nmj.2016.2

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Affine threefoldswith A^2-fibrations2016

    • Author(s)
      R.V.Gurjar, K. Masuda, M. Miyanishi
    • Journal Title

      Transformation Groups

      Volume: 未定

    • Related Report
      2015 Research-status Report
    • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Factorially closed subrings of commutative rings2015

    • Author(s)
      S. Chakraborty, R.V. Gurjar, M. Miyanishi
    • Journal Title

      Algebra and Number Theory

      Volume: 9 Issue: 5 Pages: 1137-1158

    • DOI

      10.2140/ant.2015.9.1137

    • Related Report
      2015 Research-status Report
    • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
  • [Presentation] Hypersurfaces with Ga-actions2019

    • Author(s)
      K. Masuda
    • Organizer
      アフィン代数幾何学研究集会
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Triviality of affine space fibrations2019

    • Author(s)
      M. Miyanishi
    • Organizer
      Conference in Geometry and Representations
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Triviality of affine space fibrations2019

    • Author(s)
      M. Miyanishi
    • Organizer
      The 17th Affine Algebraic Geometry Meeting
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Affine space fibration2018

    • Author(s)
      M. Miyanishi
    • Organizer
      Conference on Algebraic Geometry
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Forms of A^3 with unipotent group actions2018

    • Author(s)
      Kayo Masuda
    • Organizer
      Polynomial Rings and Affine Algebraic Geometry
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Singular fibers of A^1-fibrations2018

    • Author(s)
      Masayoshi Miyanishi
    • Organizer
      Polynomial Rings and Affine Algebraic Geometry
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Geometry of Artin -Schreier coverings2018

    • Author(s)
      Masayoshi Miyanishi
    • Organizer
      The 16th Affine Algebraic Geometry Meeting
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] G_a-actions in positive characteristic2018

    • Author(s)
      宮西 正宜
    • Organizer
      野田代数幾何学シンポジウム
    • Related Report
      2017 Research-status Report
    • Invited
  • [Presentation] A remark on the generalized Jacobian conjecture for A^2/G2017

    • Author(s)
      宮西 正宜
    • Organizer
      Higher-dimensional birational geometry, holomorphic dynamics and their interactions
    • Place of Presentation
      Singapore (Singapore)
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Remarks on the generalized Jacobian conjecture for A^2/G2017

    • Author(s)
      宮西 正宜
    • Organizer
      第15回アフィン代数幾何学研究集会
    • Place of Presentation
      関西学院大学大阪梅田キャンパス(大阪府・大阪市)
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Singular fibers of A^1-fibrations on affine threefolds2016

    • Author(s)
      宮西 正宜
    • Organizer
      第14回アフィン代数幾何学研究集会
    • Place of Presentation
      関西学院大学大阪梅田キャンパス(大阪府・大阪市)
    • Year and Date
      2016-03-07
    • Related Report
      2015 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Affine threefolds with G_a-actions2016

    • Author(s)
      宮西 正宜
    • Organizer
      Complex affine geometry, hyperbolicity and complex analsis
    • Place of Presentation
      Grenoble (France)
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research / Invited
  • [Book] Algebraic Varieties and Automorphism Groups2017

    • Author(s)
      K. Masuda, T. Kishimoto, H. Kojima, M. Miyanishi, M. Zaidenberg
    • Total Pages
      474
    • Publisher
      Mathematical Society of Japan
    • ISBN
      9784864970488
    • Related Report
      2017 Research-status Report
  • [Remarks] 増田研究室

    • URL

      https://sci-tech.ksc.kwansei.ac.jp/~kayo/

    • Related Report
      2018 Annual Research Report
  • [Remarks] 宮西正宜のホームページ

    • URL

      http://www10.plala.or.jp/masamiyanishi/miya/

    • Related Report
      2018 Annual Research Report 2017 Research-status Report 2016 Research-status Report 2015 Research-status Report
  • [Remarks] 関西学院大学理工学部数理科学科増田研究室

    • URL

      http://sci-tech.ksc.kwansei.ac.jp/~kayo/index.html

    • Related Report
      2017 Research-status Report 2016 Research-status Report
  • [Remarks] 増田研究室

    • URL

      http://sci-tech.ksc.kwansei.ac.jp/~kayo/

    • Related Report
      2015 Research-status Report
  • [Funded Workshop] 第16回アフィン代数幾何学研究集会2018

    • Related Report
      2017 Research-status Report

URL: 

Published: 2015-04-16   Modified: 2020-03-30  

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