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Explicit study on generalized spherical functions and archimedean zeta integrals

Research Project

Project/Area Number 19K03452
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 11010:Algebra-related
Research InstitutionSeikei University

Principal Investigator

Ishii Taku  成蹊大学, 理工学部, 教授 (60406650)

Project Period (FY) 2019-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2022: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2019: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Keywords保型L関数 / アルキメデスゼータ積分 / Whittaker関数
Outline of Research at the Start

保型形式のゼータ関数をその積分表示によって調べるため、積分表示の無限素点における成分である「アルキメデスゼータ積分」を具体的に計算する。まず保型形式のフーリエ展開に寄与する「一般化された球関数」の明示公式を球関数を特徴付ける偏微分方程式系を手掛かりに導出し、続いて球関数の積分変換であるアルキメデスゼータ積分を計算する。

Outline of Final Research Achievements

We derive systems of partial differential equations satisfied by Whittaker functions and Shalika functions on GL(4,R), and obtained explicit formulas of them in several cases.
We compute arichimedean zeta integrals for automorphic L-functions in the following cases: (a)Bump-Friedberg integrals for the standard and the exterior square L-functions on GL(4), (b) Rankin-Selberg L-functions on GL(n)×GL(n), GL(n)×GL(n-1), (c) Bump-Friedberg-Ginzburg integrals for the standard and the spinor L-functions on GSp(2).

Academic Significance and Societal Importance of the Research Achievements

保型形式という高い対称性を兼ね備えた関数に対するゼータ関数(保型L関数)は、様々な整数論的なゼータ関数と結びつくと考えられている重要な研究対象である。保型L関数を積分表示式(ゼータ積分)によって研究する上でネックとなるのが「悪い素点」における解析であり、そのうち無限素点における研究をゼータ積分を直接計算することで実行した。

Report

(6 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (7 results)

All 2023 2022 2021 2020

All Journal Article (2 results) (of which Peer Reviewed: 2 results) Presentation (4 results) (of which Int'l Joint Research: 1 results,  Invited: 4 results) Funded Workshop (1 results)

  • [Journal Article] Calculus of archimedean Rankin-Selberg integrals with recurrence relations2022

    • Author(s)
      Ishii Taku, Miyazaki Tadashi
    • Journal Title

      Representation Theory of the American Mathematical Society

      Volume: 26 Issue: 25 Pages: 714-763

    • DOI

      10.1090/ert/618

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Archimedean zeta integrals for GL(3)×GL(2)2022

    • Author(s)
      Hirano Miki, Ishii Taku, Miyazaki Tadashi
    • Journal Title

      Memoirs of the American Mathematical Society

      Volume: 278 Issue: 1366 Pages: 1-122

    • DOI

      10.1090/memo/1366

    • NAID

      40020756994

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Presentation] Generalized spherical functions and archimedean zeta integrals on GSp(2,R)2022

    • Author(s)
      石井卓
    • Organizer
      第2回仙台保型形式小集会π_∞
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] Whittaker functions on GL(4,R) and archimedean zeta integrals2022

    • Author(s)
      平野幹、石井卓、宮崎直
    • Organizer
      保型形式、保型L関数とその周辺
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Whittaker functions on GL(4,R) and archimedean zeta integrals2021

    • Author(s)
      石井卓
    • Organizer
      第8回京都保型形式研究集会
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] 非正則2次Siegel保型形式のFourier展開に現れる球関数について2020

    • Author(s)
      石井卓
    • Organizer
      第65回代数学シンポジウム
    • Related Report
      2020 Research-status Report
    • Invited
  • [Funded Workshop] 保型表現の解析的・数論的研究2023

    • Related Report
      2022 Research-status Report

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Published: 2019-04-18   Modified: 2025-01-30  

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