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2018 Fiscal Year Final Research Report

Various constructions of real analytic automorphic forms on real hyperbolic spaces and their application to various research fields

Research Project

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Project/Area Number 16K05065
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Algebra
Research InstitutionWaseda University (2018)
Kumamoto University (2016-2017)

Principal Investigator

Narita Hiro-aki  早稲田大学, 理工学術院, 教授 (70433315)

Co-Investigator(Renkei-kenkyūsha) Murase Atsushi  京都産業大学, 理学部, 教授 (40157772)
Project Period (FY) 2016-04-01 – 2019-03-31
Keywords実解析的保型形式 / 逆定理 / テータリフト / 実双曲空間 / 特殊Bessel模型 / 局所Maass関係式 / 非緩増加な保型形式
Outline of Final Research Achievements

One fundamental problem in the theory of automorphic forms is to extend the research of automorphic forms of one complex variable to those of multi-variables. Though there are many directions of such extensions, the fundamental aim of this research project is to construct non-holomorphic real analytyic automorphic forms. In the project I have succeeded in constructing real analytic cusp forms on real hyperbolic spaces (which is a natural higher-dmensional generalization of the complex upper half plane). More precisely I have carried out such constructions for 5-dimensional and 8n+1 dimensional cases for arbitrary positive integer n. In addition, I have also provided a general theory relevant to the constructions in terms of the theory of automorphic representations.

Free Research Field

整数論、保型形式論

Academic Significance and Societal Importance of the Research Achievements

まず, 実解析的カスプ形式を具体的構成を与えた研究は極めて少ないことは、今回の研究成果の意義を強調するものであろう. また8n+1次元実双曲空間上のカスプ形式については、「テータリフト」という方法で構成したが、非調和的な多項式を含む試験関数により構成を与えた. このような例は多変数の保型形式の枠組みで私は見たことがない. 直交群についてArtherの内視分類理論による保型表現の大きな分類理論が確立されているが, 今回の成果はその分類理論の成果の外にある結果である. また構成したカスプ形式の非消滅も証明したが,既存の方法に比べ初等的な方法で証明したことも本研究成果の意義を示すものである.

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Published: 2020-03-30  

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