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KUBOTA Ayako
Mathematics, Electronics and Informatics DivisionAssistant Professor
Mathematics

Researcher information

■ Career
  • Aug. 2024 - Present, Saitama University
  • Apr. 2023 - Jul. 2024, Waseda University
  • Apr. 2022 - Mar. 2023, Josai University
  • Apr. 2020 - Mar. 2023, Waseda University

Performance information

■ Paper
  • Stratified Mukai flop of type A and the associated invariant Hilbert scheme               
    Ayako Kubota; Yasunari Nagai
    Journal of Pure and Applied Algebra, Volume:229, Number:9, Sep. 2025, [Reviewed]
    Elsevier BV, Scientific journal
    DOI:https://doi.org/10.1016/j.jpaa.2025.108031
    DOI ID:10.1016/j.jpaa.2025.108031, ISSN:0022-4049
  • Invariant Hilbert scheme of the Cox realization of the nilpotent cone in $\mathfrak{sl}(n)$               
    Ayako Kubota
    McKay Correspondence, Mutation and Related Topics, Jan. 2023, [Reviewed]
    SPIE, In book
    DOI:https://doi.org/10.2969/aspm/08810517
    DOI ID:10.2969/aspm/08810517
  • INVARIANT HILBERT SCHEME RESOLUTION OF POPOV’S SL(2)-VARIETIES
    AYAKO KUBOTA
    Transformation Groups, Jul. 2020, [Reviewed]
    Springer Science and Business Media LLC, Scientific journal
    DOI:https://doi.org/10.1007/s00031-020-09592-2
    DOI ID:10.1007/s00031-020-09592-2, ISSN:1083-4362, eISSN:1531-586X
  • On minimality of the invariant Hilbert scheme associated to Popov’s $\mathit{SL}(2)$-variety               
    Ayako Kubota
    Proceedings of the Japan Academy, Series A, Mathematical Sciences, Volume:96, Number:7, First page:51, Last page:56, Jul. 2020, [Reviewed]
    Project Euclid, Scientific journal
    DOI:https://doi.org/10.3792/pjaa.96.010
    DOI ID:10.3792/pjaa.96.010, ISSN:0386-2194
■ Lectures, oral presentations, etc.
  • トーリック超ケーラー多様体の不変ヒルベルトスキームについて               
    May 2026
  • The invariant Hilbert scheme associated with a torus action               
    Nagoya Algebraic Geometry Workshop 2026, May 2026, [Invited]
  • Examples and non-examples of invariant Hilbert scheme resolutions               
    Symplectic singularities and related topics, Dec. 2025, [Invited]
  • Examples and non-examples of invariant Hilbert scheme resolutions               
    Workshop on Algebraic Geometry in Kanazawa, Dec. 2025, [Invited]
  • Examples of the invariant Hilbert scheme associated to the Cox realization of nilpo- tent orbit closures of type A               
    Algebraic Geometry Seminar, Sep. 2025, [Invited]
  • Examples of the invariant Hilbert scheme associated to the Cox realization of nilpotent orbit closures of type A               
    Japanese-European Symposium on Symplectic Varieties and Moduli Spaces, Sep. 2025, [Invited]
  • The invariant Hilbert scheme and the Cox realization of nilpotent orbit closures in sl(n)               
    Jul. 2025, [Invited]
  • Cox ring of type A nilpotent orbit with partition [a^k] and the associated invariant Hilbert scheme               
    May 2025, [Invited]
  • Cox実現の不変Hilbertスキームについて               
    May 2025, [Invited]
  • Some examples of the invariant Hilbert scheme of the nilpotent orbit closures of type A               
    Mar. 2025, [Invited]
  • Invariant Hilbert scheme and resolution of singularities of quotient varieties               
    Nov. 2024
  • Invariant Hilbert scheme and resolution of singularities of quotient varieties               
    Nov. 2024, [Invited]
  • Examples of the invariant Hilbert scheme of the Cox realization               
    Sep. 2024, [Invited]
  • Examples of the invariant Hilbert scheme of the Cox realization               
    Sep. 2024, [Invited]
  • 不変ヒルベルトスキームによる商多様体の特異点解消ついて               
    Aug. 2024, [Invited]
  • Cox実現の不変ヒルベルトスキームについて               
    Jul. 2024, [Invited]
  • Invariant Hilbert scheme of the Cox realization               
    Jun. 2024, [Invited]
  • On some examples of the invariant Hilbert scheme of the Cox realization               
    Apr. 2024, [Invited]
  • The invariant Hilbert scheme of the Cox realization               
    Dec. 2023, [Invited]
  • Invariant Hilbert scheme of the Cox realization               
    Oct. 2023, [Invited]
  • 不変ヒルベルトスキームによる商特異点の特異点解消について               
    Jul. 2023, [Invited]
  • Invariant Hilbert scheme of the Cox realization of the nilpotent cone of type A               
    Mar. 2023, [Invited]
  • Stratified Mukai flop and the associated invariant Hilbert scheme               
    Feb. 2023, [Invited]
  • Invariant Hilbert scheme of the Cox realization of the nilpotent cone of type A               
    Dec. 2022, [Invited]
  • Invariant Hilbert schemes and resolutions of quotient singularities               
    Sep. 2022, [Invited]
  • On the U-invariants of the ring of matrices               
    Mar. 2022, [Invited]
  • On the G-Hilbert scheme of the closure of the regular nilpotent orbit of type A               
    Sep. 2020, [Invited]
  • On the G-Hilbert scheme of the closure of the regular nilpotent orbit of type A               
    Jul. 2020, [Invited]
  • A型の極大冪零軌道閉包のG-Hilbertスキームについて               
    Jun. 2020, [Invited]
  • Invariant Hilbert schemes and resolutions of singularities of quasihomogeneous SL(2)-varieties               
    Feb. 2020, [Invited]
  • 不変Hilbertスキームによる準等質SL(2)-多様体の特異点解消               
    Dec. 2019, [Invited]
  • On minimality of the invariant Hilbert scheme associated with Popov's SL(2)-variety               
    Sep. 2019
  • On minimality of the invariant Hilbert scheme associated with Popov's SL(2)-variety               
    Sep. 2019, [Invited]
  • PopovのSL(2)-多様体に付随する不変Hilbertスキームの極小性について               
    May 2019
  • Invariant Hilbert scheme resolution of Popov's SL(2)-varieties               
    Nov. 2018, [Invited]
  • Invariant Hilbert scheme resolution of Popov's SL(2)-varieties               
    Sep. 2018
  • 準等質SL(2)-多様体について               
    Aug. 2018, [Invited]
  • Invariant Hilbert scheme resolution of Popov's SL(2)-varieties               
    Aug. 2018, [Invited]
  • Invariant Hilbert scheme resolution of Popov's SL(2)-varieties               
    Jun. 2018
  • 不変Hilbertスキームによる3次元アファイン正規準等質SL(2)-多様体の特異点解消               
    Jun. 2018, [Invited]
  • Invariant Hilbert scheme resolution of Popov's toric SL(2)-varieties               
    Apr. 2018, [Invited]
  • Invariant Hilbert scheme resolution of Popov's SL(2)-varieties               
    Mar. 2018
  • Invariant Hilbert scheme resolution of Popov's SL(2)-varieties               
    Mar. 2018
  • Invariant Hilbert scheme resolution of Popov's SL(2)-varieties               
    Feb. 2018, [Invited]
  • 不変Hilbertスキームとアファイン準等質SL(2)-多様体               
    Feb. 2017
  • Minimal generating set of a ring of invariants for vectors, linear forms, and matrices               
    Mar. 2016, [Invited]
■ Research projects
  • Birational models of the invariant Hilbert scheme               
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Early-Career Scientists, Apr. 2026 - Mar. 2031
    Saitama University, Principal investigator
    Grant amount(Total):4550000, Direct funding:3500000, Indirect funding:1050000
    Grant number:26K16956
  • The invariant Hilbert scheme associated to the Cox realization               
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Research Activity Start-up, Sep. 2020 - Mar. 2025
    Principal investigator
    Grant amount(Total):2600000, Direct funding:2000000, Indirect funding:600000
    A categorical quotient of an affine variety by an action of a reductive group is usually singular even if the original variety is smooth. One possible candidate for its resolution of singularities is known to be given by the invariant Hilbert scheme associated to that quotient presentation. As the behavior of the invariant Hilbert scheme depends on the quotient presentation of the variety, one can ask what is a good quotient construction of it.
    In this research, we focused on a construction called the Cox realization, which represents an affine normal variety with a finitely generated divisor group as a quotient of the spectrum of its Cox ring, and considered the associated invariant Hilbert scheme. This framework was applied to the case of nilpotent orbit closures of type A, particularly to the case when a nilpotent orbit has a unique or two Springer resolutions.
    Grant number:20K22313
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