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Studies on noncommutative algebraic geometry and generalized complex geometry

Research Project

Project/Area Number 16K13746
Research Category

Grant-in-Aid for Challenging Exploratory Research

Allocation TypeMulti-year Fund
Research Field Algebra
Research InstitutionOsaka University

Principal Investigator

Okawa Shinnosuke  大阪大学, 理学研究科, 准教授 (60646909)

Co-Investigator(Kenkyū-buntansha) 後藤 竜司  大阪大学, 理学研究科, 教授 (30252571)
Project Period (FY) 2016-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2017: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywords非可換代数幾何学 / AS正則代数 / 一般化された複素構造 / 導来圏 / 非可換射影空間 / 正則Poisson構造 / Hirzebruch曲面 / 非可換del Pezzo曲面 / ポアソン構造
Outline of Final Research Achievements

We generalized the classes of noncommutative algebras corresponding to noncommutative projective planes and noncommutative quadrics so that any noncommutative del Pezzo surface correspond to one of these classes of algebras. Also we partially generalized the correspondence between those algebras and commutative algebro-geometric data.
We gave a conjectural HKR isomorphism for Deligne-Mumford stacks, and confirmed it in several interesting examples. Inspired by this, we defined the notion of generalized complex orbifold.
We found a class of noncommutative graded algebras which yield noncommutative weighted projective 3-spaces P(1,1,1,2), and found the corresponding Poisson geometry on the commutative P(1,1,1,2). These are related to the geometry of noncommutative/Poisson del Pezzo surfaces of degree 2.

Academic Significance and Societal Importance of the Research Achievements

非可換射影幾何学、一般化された複素幾何のどちらにとっても、非可換/一般化されたdel Pezzo曲面は最も重要で基本的な例である。非可換射影幾何学においては射影平面と2次曲面の場合を除いて基礎づけに不満があったが、それを補う形で一般の非可換del Pezzo曲面を定義するようなAS正則代数のクラスを定義することができた。また、orbifoldの非可換変形に関する理解が進み、思った以上に豊かな現象が起きていることがわかった。さらに、Poisson幾何との対応を参照することで、高次元の新たなAS正則代数のクラスが発見できた。これらは今後研究対象となるべきものである。

Report

(5 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (39 results)

All 2020 2019 2018 2017 2016 Other

All Int'l Joint Research (9 results) Journal Article (3 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 3 results) Presentation (24 results) (of which Int'l Joint Research: 21 results,  Invited: 24 results) Remarks (2 results) Funded Workshop (1 results)

  • [Int'l Joint Research] Universiteit Antwerpen(ベルギー)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] FWO(ベルギー)

    • Related Report
      2018 Research-status Report
  • [Int'l Joint Research] ICTP(イタリア)

    • Related Report
      2018 Research-status Report
  • [Int'l Joint Research] Carleton University(カナダ)

    • Related Report
      2018 Research-status Report
  • [Int'l Joint Research] University of Edinburgh(英国)

    • Related Report
      2018 Research-status Report
  • [Int'l Joint Research] FWO(ベルギー)

    • Related Report
      2017 Research-status Report
  • [Int'l Joint Research] University of New South Wales(オーストラリア)

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

    • Related Report
      2017 Research-status Report
  • [Int'l Joint Research] Edinburgh University(英国)

    • Related Report
      2017 Research-status Report
  • [Journal Article] An example of birationally inequivalent projective symplectic varieties which are D-equivalent and L-equivalent2020

    • Author(s)
      Shinnosuke Okawa
    • Journal Title

      Mathematische Zeitschrift

      Volume: - Issue: 1-2 Pages: 459-464

    • DOI

      10.1007/s00209-020-02519-3

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] The class of the affine line is a zero divisor in the Grothendieck ring: via G2-Grassmannians2019

    • Author(s)
      Atsushi Ito, Makoto Miura, Shinnosuke Okawa, Kazushi Ueda
    • Journal Title

      Journal of Algebraic Geometry

      Volume: 28 Issue: 2 Pages: 245-250

    • DOI

      10.1090/jag/731

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Surfaces of globally F-regular type are of Fano type2017

    • Author(s)
      Shinnosuke Okawa
    • Journal Title

      Tohoku Mathematical Journal

      Volume: 69(1) Pages: 35-42

    • Related Report
      2016 Research-status Report
    • Peer Reviewed
  • [Presentation] Exceptional collections on the Hirzebruch surface of degree 22020

    • Author(s)
      Shinnosuke Okawa
    • Organizer
      Derived categories and geometry of algebraic varieties
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Moduli space of semiorthogonal decompositions2020

    • Author(s)
      Shinnosuke Okawa
    • Organizer
      Shafarevich Seminar at Steklov Institute of Mathematics
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Deformations of semiorthogonal decompositions and application to symmetric products of curves2019

    • Author(s)
      Shinnosuke Okawa
    • Organizer
      Interaction Between Algebraic Geometry and QFT
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Defining noncommutative del Pezzo surfaces as AS-regular I-algebras2018

    • Author(s)
      Shinnosuke Okawa
    • Organizer
      MFO workshop: Interactions between Algebraic Geometry and Noncommutative Algebra
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] On the definition of noncommutative del Pezzo surfaces2018

    • Author(s)
      Shinnosuke Okawa
    • Organizer
      Positivity in Algebraic Geometry
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] On the definition of noncommutative del Pezzo surfaces2018

    • Author(s)
      Shinnosuke Okawa
    • Organizer
      HOMOLOGICAL METHODS IN ALGEBRA AND GEOMETRY II
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] On the definition of noncommutative del Pezzo surfaces2018

    • Author(s)
      Shinnosuke Okawa
    • Organizer
      Differential, Algebraic and Topological Methods in Complex Algebraic Geometry
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Noncommutative del Pezzo surfaces as AS-regular I-algebras2018

    • Author(s)
      Shinnosuke Okawa
    • Organizer
      Noncommutative deformations and moduli spaces
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] On the definition of noncommutative del Pezzo surfaces2018

    • Author(s)
      Shinnosuke Okawa
    • Organizer
      Higher dimensional algebraic geometry
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Derived equivalence and Grothendieck ring of varieties2017

    • Author(s)
      Shinnosuke Okawa
    • Organizer
      Seoul Seminar on Algebraic Geometry-4
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Derived Equivalence and Grothendieck Ring of Varieties2017

    • Author(s)
      Shinnosuke Okawa
    • Organizer
      Higher Dimensional Algebraic Geometry
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Noncommutative del Pezzo surfaces and their moduli spaces2017

    • Author(s)
      Shinnosuke Okawa
    • Organizer
      Classification and Moduli theory of algebraic varieties
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Noncommutative rigidity of the moduli stack of stable pointed curves2017

    • Author(s)
      Shinnosuke Okawa
    • Organizer
      非可換代数幾何学とその周辺
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Noncommutative del Pezzo surfaces and their moduli space2017

    • Author(s)
      Shinnosuke Okawa
    • Organizer
      第23回複素幾何シンポジウム
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Compact moduli of marked noncommutative del Pezzo surfaces2016

    • Author(s)
      Shinnosuke Okawa
    • Organizer
      Generalized Geometry and Noncommutative Algebra
    • Place of Presentation
      Oxford University, UK
    • Year and Date
      2016-12-05
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Noncommutative projective planes and their moduli spaces2016

    • Author(s)
      大川新之介
    • Organizer
      静岡代数学セミナー
    • Place of Presentation
      静岡大学
    • Year and Date
      2016-11-25
    • Related Report
      2016 Research-status Report
    • Invited
  • [Presentation] On derived equivalence and Grothendieck ring of varieties2016

    • Author(s)
      大川新之介
    • Organizer
      都の西北代数幾何学シンポジウム
    • Place of Presentation
      早稲田大学
    • Year and Date
      2016-11-15
    • Related Report
      2016 Research-status Report
    • Invited
  • [Presentation] Minimal model theory for Brauer pairs2016

    • Author(s)
      Shinnosuke Okawa
    • Organizer
      Categorical and analytic invariants in Algebraic geometry IV
    • Place of Presentation
      東京大学Kavli IPMU
    • Year and Date
      2016-11-14
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Derived equivalence and Grothendieck ring of varieties2016

    • Author(s)
      Shinnosuke Okawa
    • Organizer
      Workshop on spherical varieties
    • Place of Presentation
      Yau Mathematical Sciences Center, Tsinghua University, China
    • Year and Date
      2016-10-31
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Compact moduli of marked noncommutative del Pezzo surfaces2016

    • Author(s)
      Shinnosuke Okawa
    • Organizer
      Non-commutative, derived and homotopical methods in geometry
    • Place of Presentation
      Universiteit Antwerpen, Belgium
    • Year and Date
      2016-09-19
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Noncommutative Hirzebruch surfaces2016

    • Author(s)
      Shinnosuke Okawa
    • Organizer
      Categorical and analytic invariants in Algebraic geometry 3
    • Place of Presentation
      Higher School of Economics, Russia
    • Year and Date
      2016-09-12
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Compact moduli of marked noncommutative del Pezzo surfaces2016

    • Author(s)
      大川新之介
    • Organizer
      代数学シンポジウム
    • Place of Presentation
      佐賀大学
    • Year and Date
      2016-09-07
    • Related Report
      2016 Research-status Report
    • Invited
  • [Presentation] Noncommutative Hirzebruch surfaces2016

    • Author(s)
      Shinnosuke Okawa
    • Organizer
      School and Workshop on Homological Methods in Algebra and Geometry
    • Place of Presentation
      African Institute for Mathematical Sciences, Ghana
    • Year and Date
      2016-08-01
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] On noncommutative Hirzebruch surfaces2016

    • Author(s)
      Shinnosuke Okawa
    • Organizer
      Non-commutative crepant resolutions, Ulrich Modules and generalizations of the Mckay correspondence
    • Place of Presentation
      京都大学数理解析研究所
    • Year and Date
      2016-06-13
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research / Invited
  • [Remarks]

    • URL

      http://www.math.sci.osaka-u.ac.jp/~okawa/index.html

    • Related Report
      2017 Research-status Report
  • [Remarks]

    • URL

      http://www.math.sci.osaka-u.ac.jp/~okawa/

    • Related Report
      2016 Research-status Report
  • [Funded Workshop] 非可換代数幾何学とその周辺2017

    • Related Report
      2017 Research-status Report

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Published: 2016-04-21   Modified: 2022-02-22  

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