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1990 Fiscal Year Final Research Report Summary

Automorphic Forms and Number Theory

Research Project

Project/Area Number 01540042
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 代数学・幾何学
Research InstitutionKyoto University

Principal Investigator

YAMAUCHI Masatoshi  Kyoto University Yoshida College Assistant Professor, 教養部, 助教授 (30022651)

Co-Investigator(Kenkyū-buntansha) NISHIYAMA Kyo  Kyoto University Yoshida College Assistant Professor, 教養部, 助教授 (70183085)
MATUKI Toshiko  Kyoto University Yoshida College Assistant Professor, 教養部, 助教授 (20157283)
GYOUJYA Akihiko  Kyoto University Yoshida College Assistant Professor, 教養部, 助教授 (50116026)
FUJIKI Akira  Kyoto University Yoshida College Assistant Professor, 教養部, 助教授 (80027383)
SAITOU Hiroshi  Kyoto University Yoshida College Assistant Professor, 教養部, 助教授 (20025464)
Project Period (FY) 1989 – 1990
KeywordsPrehomogenous Space / L-function / Gauss sum / Representation of quaternions / Hecke operator / Kahler manifold / Representation of Lie groups / flagmanifold
Research Abstract

This research is mainly concerned with the field of modular forms and related topics. We believe we could obtain many fruitful results. The main results are as follows :
(1) H. Saito proves the functional equations of L functions with respect to the prehomogeneous space of the binary quadratic forms and gives their residues. Furthormore H. Saito defines the gaussian sum with respect to the matrix attached to the quadratic character of the quadratic forms over the finite field and showing this sum is a natural generalization of the classical gaussian sum, he gives some important applications to the prehomogeneous space of symmetric matrices and Siegel modular forms.
(2) H. Saito and M. Yamauchi consider the irreducible representation of the multiplicative group of the quaternion algebra over the local field and give an explicit form of the restrictions to Cartan subgroups and the character of these representations. Owing to this result, they give an application to the trace formula of Hec … More ke operators and give many important numerical examples of characteristic polynomials of Hecke operators for the modular groups of higher levels (cowork with H. Hijikata).
(3) A. Fujiki shows that the equivalence classes M of the representations from the fundamental group of the compact Kahler manifold to the complex reductive algebraic groups has the structure of the hyper Kahler space which admits a special C actions. Further in the associated Calabi family he showsthat the general fibre is isomorphic to M and special fibre is isomorphic to the moduli space of the Higgs bundle corresponding to the above representation.
(4) The open orbit of the prehomogenenous space acting the reductive algebraic group is an affine variety if and only if the space is regular. A. Gyoja gives a counter example to the conjecture that the regularity is a sufficient condition for the nonreductive case.
(5) T. Matuki describes the mapping which maps any representations of semisimple Lie groups to the principal series representations by the orbit structure over the flag manifolds. And for the classical simple Lie groups, he gives the symbolical expressions of the orbit structure of the flag manifolds. (cowork with T. Ohshima)
(6) K. Nishiyama defines the harmonic oscillator representation for the ortosymplectic Lie superalgebra and shows that it gives a unitary representation. This is an analogy of the Weil representations of the ordinary symplectic group. He also determines the wave front set of the Weil representations. Less

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] 斎藤 裕: "A generation of Gauss sums and its applications to Siegel modularforms and αーfunctions" preprint.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 斎藤 裕: "Pepresentations of quaternuion algefras over local fields and trace formulas of Hecke operators" preprint.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 藤木 明: "Hyperhahlen struature on the moduli space of flat bundles" preprint.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 行者 明彦: "A counterexample in the theory of Prehomogeneous uector space" Proc.Japan Acod.66(1990). 66. 26-29 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 松本 敏彦: "Embeddingo of Piscrete Seiues into Principal series" Proceedings of a Corference Held in Copenhagen August to September. 147-175 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 西田 享: "Oscillator Representations for Orthosymplectic A lgefras" Journal of Algefra. 129. 231-261 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hiroshi, Saito: "A generalization of Gauss sums and its application to Siegel modularforms and associated with the vector space of quadratic forms"

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hiroshi, Saito: "Representations of quaternion algebras over local fields and trace formulas of Hecke operators"

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Akira, Fujiki: "Hyperkahler structure on the moduli space of flat bundles"

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Akihiko, Gyojya: "A counterexample in the theory of Prehomogeneous vector spaces" proc. Japan Acad.V. 66. 26-27 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Toshihiko, Matuki: "Embeddings of Discrete Series into Principal series" Proc. Conference Held Copenhagen. 147-175

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kyo, Nishiyama: "Oscillator Representations for Orthosymplectic Algebras" Journal of Algebra. V. 129. 231-262

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1993-08-12  

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