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Number theory of real quadratic fields from the perspective of non-holomorphic modular forms

Research Project

Project/Area Number 20K14292
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 11010:Algebra-related
Research InstitutionKyushu University (2022-2023)
Nagoya University (2020-2021)

Principal Investigator

Matsusaka Toshiki  九州大学, 数理学研究院, 助教 (60868157)

Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2023: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2022: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2020: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Keywordsモックモジュラー形式 / 双曲型アイゼンシュタイン級数 / サイクル積分 / Rademacher記号 / モジュラー結び目 / 偽テータ関数 / 量子不変量 / 多重Bernoulli数 / 双曲型Eisenstein級数 / 実二次体 / 双曲アイゼンシュタイン級数
Outline of Research at the Start

モジュラー形式のフーリエ係数には,数論的に重要な情報が様々に現れる.これをカスプのまわりでの様子と見るならば,虚二次点や実二次点のまわりにおいては,どのような現象が見られるだろうか.本研究テーマは,ヘッケやピーターソンに由来するこの3種のフーリエ係数の数論的な役割について,この十数年の間に急速に進展している多種の非正則なモジュラー形式の理論を導入し,また相互に影響を与え発展させることで,その解明を目指すものである.

Outline of Final Research Achievements

We investigated a mysterious analytic object introduced over 80 years ago, known as the “cycle integrals” of modular forms, using the recent advancements in the theory of mock modular forms. Our perspectives on number theory and topology differ from the original motivation behind the notion of the cycle integrals. As a result, for instance, although the cycle integrals of the number-theoretical object called the elliptic modular j-function remain mysterious, we discovered that considering further cycle integrals of their generating function provides a geometric information, such as the number of intersections of a certain pair of geodesics.

Academic Significance and Societal Importance of the Research Achievements

極めて古典的な対象であるにも関わらず,その数論的な役割が謎に包まれていた「サイクル積分」について,その数論的な側面に留まらず,トポロジーの研究との深い繋がりを見出せたことは,意外性もあり,今後の研究に大きな展望を与えるものである.また,モックモジュラー形式という,比較的新しく,また未だ国内に専門家が多くなかった理論を積極的に導入して,その新たな応用を与えたことも,意義が大きいと考える.

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

    (74 results)

All 2024 2023 2022 2021 2020 Other

All Int'l Joint Research (4 results) Journal Article (22 results) (of which Int'l Joint Research: 5 results,  Peer Reviewed: 15 results,  Open Access: 8 results) Presentation (45 results) (of which Int'l Joint Research: 11 results,  Invited: 33 results) Remarks (3 results)

  • [Int'l Joint Research] University of Public Service(ハンガリー)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] University of Public Service(ハンガリー)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] University of Novi Sad(セルビア)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] University of Public Service(ハンガリー)

    • Related Report
      2020 Research-status Report
  • [Journal Article] Modular Transformations of Homological Blocks for Seifert Fibered Homology 3-Spheres2024

    • Author(s)
      Matsusaka Toshiki、Terashima Yuji
    • Journal Title

      Communications in Mathematical Physics

      Volume: 405 Issue: 2 Pages: 1-25

    • DOI

      10.1007/s00220-024-04939-2

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] How long can k-Gobel sequences remain integers?2024

    • Author(s)
      Rinnosuke Matsuhira, Toshiki Matsusaka, Koki Tsuchida
    • Journal Title

      The American Mathematical Monthly

      Volume: -

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Curious congruences for cyclotomic polynomials II2023

    • Author(s)
      Matsusaka Toshiki、Shibukawa Genki
    • Journal Title

      Research in Number Theory

      Volume: 10 Issue: 1 Pages: 1-9

    • DOI

      10.1007/s40993-023-00489-z

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Arithmetic Dijkgraaf?Witten invariants for real quadratic fields, quadratic residue graphs, and density formulas2023

    • Author(s)
      Deng Yuqi、Kurimaru Riku、Matsusaka Toshiki
    • Journal Title

      Research in Number Theory

      Volume: 9 Issue: 4 Pages: 1-16

    • DOI

      10.1007/s40993-023-00471-9

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] 葉廣級数と偽テータ関数に関する余録2023

    • Author(s)
      松坂俊輝
    • Journal Title

      2023早稲田整数論研究集会報告集

      Volume: -

    • Related Report
      2023 Annual Research Report
  • [Journal Article] 円分多項式に関する奇妙な合同式について2023

    • Author(s)
      松坂俊輝
    • Journal Title

      RIMS共同研究(公開型)「解析的整数論とその周辺」(2023),数理解析研究所講究録

      Volume: -

    • Related Report
      2023 Annual Research Report
  • [Journal Article] REMARKABLE RELATIONS BETWEEN THE CENTRAL BINOMIAL SERIES, EULERIAN POLYNOMIALS, AND POLY-BERNOULLI NUMBERS, LEADING TO STEPHAN'S OBSERVATION2023

    • Author(s)
      Beata Benyi, Toshiki Matsusaka
    • Journal Title

      Kyushu Journal of Mathematics

      Volume: 77 Issue: 1 Pages: 149-158

    • DOI

      10.2206/kyushujm.77.149

    • ISSN
      1340-6116, 1883-2032
    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Modular knots, automorphic forms, and the Rademacher symbols for triangle groups2023

    • Author(s)
      Toshiki Matsusaka, Jun Ueki
    • Journal Title

      Research in the Mathematical Sciences

      Volume: 10, Article number 4 Issue: 1

    • DOI

      10.1007/s40687-022-00366-8

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Hikami’s observations on unified WRT invariants and false theta functions2023

    • Author(s)
      Toshiki Matsusaka
    • Journal Title

      "Low dimensional topology and number theory" Springer Proceedings in Mathematics & Statistics

      Volume: -

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] A hyperbolic analogue of the Rademacher symbol2023

    • Author(s)
      Toshiki Matsusaka
    • Journal Title

      Mathematische Annalen

      Volume: - Issue: 3 Pages: 2843-2886

    • DOI

      10.1007/s00208-023-02588-9

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] テータ関数の2つの様式「擬テータ」と「偽テータ」2023

    • Author(s)
      Toshiki Matsusaka
    • Journal Title

      第6回数理新人セミナー報告集

      Volume: -

    • Related Report
      2022 Research-status Report
  • [Journal Article] Combinatorial aspects of poly-Bernoulli polynomials and poly-Euler numebrs2022

    • Author(s)
      Beata Benyi, Toshiki Matsusaka
    • Journal Title

      Journal de Theorie des Nombres de Bordeaux

      Volume: Tome 34, 3 Issue: 3 Pages: 917-939

    • DOI

      10.5802/jtnb.1234

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Bijective enumerations for symmetrized poly-Bernoulli polynomials2022

    • Author(s)
      Minoru Hirose, Toshiki Matsusaka, Ryutaro Sekigawa, Hyuga Yoshizaki
    • Journal Title

      The Electronic Journal of Combinatorics

      Volume: 29, 3 Issue: 3

    • DOI

      10.37236/10598

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] 量子モジュラー形式とSeifert多様体に対するhomological blockの保型変換則2022

    • Author(s)
      Toshiki Matsusaka
    • Journal Title

      RIMS共同研究(公開型)「保型形式,保型L関数とその周辺」(2022), 数理解析研究所講究録

      Volume: -

    • Related Report
      2022 Research-status Report
  • [Journal Article] Ramanujan’s mock theta functions and mock modular forms (Japanese, survey)2021

    • Author(s)
      Toshiki Matsusaka
    • Journal Title

      RIMS Kokyuroku Bessatsu, Algebraic Number Theory and Related Topics 2020

      Volume: 印刷中

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] On the behavior of multiple zeta-functions with identical arguments on the real line2021

    • Author(s)
      Kohji Matsumoto, Toshiki Matsusaka, Ilija Tanackov
    • Journal Title

      Journal of Number Theory

      Volume: 印刷中

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] 三角群のモジュラー結び目に関するRademacher記号と2-コサイクルについて2021

    • Author(s)
      Toshiki Matsusaka
    • Journal Title

      研究集会「結び目の数理III」報告集

      Volume: -

    • Related Report
      2021 Research-status Report
    • Open Access
  • [Journal Article] 三角群に関するRademacher記号とモジュラー結び目2021

    • Author(s)
      Toshiki Matsusaka
    • Journal Title

      第66回代数学シンポジウム報告集

      Volume: -

    • Related Report
      2021 Research-status Report
    • Open Access
  • [Journal Article] 多重Bernoulli数の組合せ的解釈とStephanの観察について2021

    • Author(s)
      Toshiki Matsusaka
    • Journal Title

      数理解析研究所講究録「解析的整数論とその周辺」

      Volume: 印刷中

    • Related Report
      2021 Research-status Report
    • Open Access
  • [Journal Article] On the Combinatorics of Symmetrized Poly-Bernoulli Bumbers2021

    • Author(s)
      Beata Benyi, Toshiki Matsusaka
    • Journal Title

      The Electronic Journal of Combinatorics

      Volume: 28 Issue: 1

    • DOI

      10.37236/9743

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Linear Diophantine equations in Piatetski-Shapiro sequences2021

    • Author(s)
      Toshiki Matsusaka, Kota Saito
    • Journal Title

      Acta Arithmetica

      Volume: -

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Symmetrized poly-Bernoulli numbers and combinatorics2020

    • Author(s)
      Toshiki Matsusaka
    • Journal Title

      Journal of Integer Sequences

      Volume: 23

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Modular knots, automorphic forms, and the Rademacher symbols2024

    • Author(s)
      Toshiki Matsusaka
    • Organizer
      2024 Workshop on Number Theory and Algebra
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Tales of integers2024

    • Author(s)
      Toshiki Matsusaka
    • Organizer
      2024 Workshop on Number Theory and Algebra
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] How long can k-Gobel sequences remain integers?2024

    • Author(s)
      Toshiki Matsusaka
    • Organizer
      第17回ゼータ若手研究集会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Introduction to quantum modular forms & discontinuity property of Habiro series2024

    • Author(s)
      Toshiki Matsusaka
    • Organizer
      Low dimensional topology and number theory XV
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 崩れた保型性を持つq-級数について2024

    • Author(s)
      Toshiki Matsusaka
    • Organizer
      研究集会「q級数とその周辺」
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] Kaneko's val function and a hyperbolic analogue of Rademacher's symbol2024

    • Author(s)
      Toshiki Matsusaka
    • Organizer
      UNIST Number Theory Seminar
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Discontinuity property of a certain Habiro series at roots of unity2023

    • Author(s)
      Toshiki Matsusaka
    • Organizer
      International Seminar on Automorphic Forms
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Curious congruences for cyclotomic polynomials2023

    • Author(s)
      Toshiki Matsusaka
    • Organizer
      RIMS共同研究(公開型)「解析的整数論とその周辺」
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] How long can k-Gobel sequences remain integers?2023

    • Author(s)
      Toshiki Matsusaka
    • Organizer
      第149回日本数学会九州支部例会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 双曲Rademacher記号2023

    • Author(s)
      Toshiki Matsusaka
    • Organizer
      数論合同セミナー
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] モックモジュラー形式と数論2023

    • Author(s)
      Toshiki Matsusaka
    • Organizer
      数理談話会
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] Rogers再訪: Baileyペアと偽テータ関数2023

    • Author(s)
      Toshiki Matsusaka
    • Organizer
      第2回大分数論研究集会
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] 中央二項級数の負の整数点での値2023

    • Author(s)
      Toshiki Matsusaka
    • Organizer
      第148回日本数学会九州支部例会
    • Related Report
      2022 Research-status Report
  • [Presentation] テータ関数の2つの様式「擬テータ」と「偽テータ」2023

    • Author(s)
      Toshiki Matsusaka
    • Organizer
      第6回数理新人セミナー
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] Hikami’s observations on unified WRT invariants and false theta functions2023

    • Author(s)
      Toshiki Matsusaka
    • Organizer
      Gauge Fields in Arithmetic, Topology&Physics
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Hikami’s observations on unified WRT invariants and false theta functions2023

    • Author(s)
      Toshiki Matsusaka
    • Organizer
      2023早稲田整数論研究集会
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] Variations on a function of Rademacher2022

    • Author(s)
      Toshiki Matsusaka
    • Organizer
      九大代数学セミナー
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] モックモジュラー形式の理論および最近の進展について2022

    • Author(s)
      Toshiki Matsusaka
    • Organizer
      2022年度八王子数論セミナー「モックテータ関数」
    • Related Report
      2022 Research-status Report
  • [Presentation] フィールズ賞が分かりたい~ほんの少しの理解を目指して 2022~2022

    • Author(s)
      Toshiki Matsusaka
    • Organizer
      MathPower2022
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] Piatetski-Shapiro列における不定方程式の解について2022

    • Author(s)
      Toshiki Matsusaka
    • Organizer
      2022大分熊本整数論研究集会
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] 8次元球充填問題について2022

    • Author(s)
      Toshiki Matsusaka
    • Organizer
      ウインクあいちセミナー
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] Modular transformation formulas for homological blocks2022

    • Author(s)
      Toshiki Matsusaka
    • Organizer
      RIMS conference "Automorphic forms, automorphic L-functions and related topics"
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Modular transformations of homological blocks for Seifert fibered homology 3-spheres2022

    • Author(s)
      Toshiki Matsusaka
    • Organizer
      Low dimensional topology and number theory XIII
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] Ramanujanのモックテータ関数とモックモジュラー形式について(サーベイ)2021

    • Author(s)
      Toshiki Matsusaka
    • Organizer
      解析数論セミナー
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] Stephan's observation on the central binomial series2021

    • Author(s)
      Toshiki Matsusaka
    • Organizer
      九大多重ゼータセミナー
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] Ramanujanのモックテータ関数とモックモジュラー形式について(サーベイ)2021

    • Author(s)
      Toshiki Matsusaka
    • Organizer
      東北大学代数セミナー
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] Triangle modular knots and Rademacher symbols2021

    • Author(s)
      Toshiki Matsusaka
    • Organizer
      代数学シンポジウム
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] 多重Bernoulli数の組合せ論2021

    • Author(s)
      Toshiki Matsusaka
    • Organizer
      2021大分整数論研究集会
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] 数の愛好家2021

    • Author(s)
      Toshiki Matsusaka
    • Organizer
      若手研究者の今を知る「アカデミックフラッシュ」
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] 中央二項級数に関するStephanの観察について2021

    • Author(s)
      Toshiki Matsusaka
    • Organizer
      RIMS共同研究(公開型)「解析的整数論とその周辺」
    • Related Report
      2021 Research-status Report
  • [Presentation] Bijective enumerations for symmetrized poly-Bernoulli polynomials2021

    • Author(s)
      Toshiki Matsusaka
    • Organizer
      九大多重ゼータセミナー
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] Estermann zeta functions and cycle integrals2021

    • Author(s)
      Toshiki Matsusaka
    • Organizer
      月例報告会
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] Extnsions of the combinatorics of poly-Bernoulli numbers2021

    • Author(s)
      Toshiki Matsusaka
    • Organizer
      第56回関西多重ゼータ研究会
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] Modular knots, automorphic forms, and the Rademacher symbols for triangle groups2021

    • Author(s)
      Toshiki Matsusaka
    • Organizer
      NCTS Seminar on Number Theory
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] On the combinatorics of symmetrized poly-Bernoulli numbers (joint work with Beata Benyi)2021

    • Author(s)
      Toshiki Matsusaka
    • Organizer
      第14回ゼータ若手研究集会
    • Related Report
      2020 Research-status Report
  • [Presentation] Piatetski-Shapiro列における不定方程式の解について (joint work with Kota Saito)2021

    • Author(s)
      Toshiki Matsusaka
    • Organizer
      九州代数的整数論2021春
    • Related Report
      2020 Research-status Report
  • [Presentation] Eisenstein series associated to binary quadratic forms2020

    • Author(s)
      Toshiki Matsusaka
    • Organizer
      九大多重ゼータセミナー
    • Related Report
      2020 Research-status Report
    • Invited
  • [Presentation] Rademacher 記号の双曲類似2020

    • Author(s)
      Toshiki Matsusaka
    • Organizer
      第19回仙台広島整数論集会
    • Related Report
      2020 Research-status Report
  • [Presentation] アイゼンシュタイン級数の三幅対2020

    • Author(s)
      Toshiki Matsusaka
    • Organizer
      日本数学会2020年度秋季総合分科会
    • Related Report
      2020 Research-status Report
  • [Presentation] トーラス結び目と三角群のモックモジュラー形式(植木潤氏との共同研究)2020

    • Author(s)
      Toshiki Matsusaka
    • Organizer
      研究集会「東北結び目セミナー2020」
    • Related Report
      2020 Research-status Report
  • [Presentation] Linking numbers and modular forms for the triangle groups (joint work with Jun Ueki)2020

    • Author(s)
      Toshiki Matsusaka
    • Organizer
      Japan Europe Number Theory Exchange Seminar
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Two analogues of the Rademacher symbol2020

    • Author(s)
      Toshiki Matsusaka
    • Organizer
      International Seminar on Automorphic Forms
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 対称化多重Bernoulli数の組合せ的解釈について (joint work with Beata Benyi)2020

    • Author(s)
      Toshiki Matsusaka
    • Organizer
      津田塾大学整数論ワークショップ
    • Related Report
      2020 Research-status Report
    • Invited
  • [Presentation] サイクル積分とモックモジュラー形式に関する最近の進展2020

    • Author(s)
      Toshiki Matsusaka
    • Organizer
      RIMS共同研究(公開型)「代数的整数論とその周辺」2020
    • Related Report
      2020 Research-status Report
    • Invited
  • [Presentation] 三角群のモジュラー結び目に関するRademacher記号と2-コサイクル (joint work with Jun Ueki)2020

    • Author(s)
      Toshiki Matsusaka
    • Organizer
      研究集会「結び目の数理III」
    • Related Report
      2020 Research-status Report
  • [Remarks] Toshiki Matsusaka

    • URL

      https://sites.google.com/site/tmatsusaka556/

    • Related Report
      2023 Annual Research Report 2022 Research-status Report 2021 Research-status Report 2020 Research-status Report
  • [Remarks] Friday Tea Time Zoom Seminar

    • URL

      https://sites.google.com/view/fridayteatime/

    • Related Report
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Published: 2020-04-28   Modified: 2025-01-30  

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