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Characterization of homogeneous spaces admitting flat geometric structures by means of invariants

Research Project

Project/Area Number 19540091
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Geometry
Research InstitutionHiroshima University

Principal Investigator

AGAOKA Yoshio  Hiroshima University, 大学院・理学研究科, 教授 (50192894)

Co-Investigator(Kenkyū-buntansha) TAMARU Hiroshi  広島大学, 大学院・理学研究科, 准教授 (50306982)
宇佐美 広介  広島大学, 大学院・理学研究科, 准教授 (90192509)
中山 裕道  広島大学, 大学院・理学研究科, 准教授 (30227970)
今野 均  広島大学, 大学院・理学研究科, 准教授 (00291477)
兼田 英二  大阪大学, 大学教育実践センター, 教授 (90116137)
Co-Investigator(Renkei-kenkyūsha) USAMI Hiroyuki  広島大学, 大学院・理学研究科, 准教授 (90192509)
NAKAYAMA Hiromichi  青山学院大学, 理工学部, 教授 (30227970)
KONNO Hitoshi  広島大学, 大学院・理学研究科, 准教授 (00291477)
KANEDA Eiji  大阪大学, 大学教育実践センター, 教授 (90116137)
Project Period (FY) 2007 – 2009
Project Status Completed (Fiscal Year 2009)
Budget Amount *help
¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2009: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2008: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2007: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Keywords微分幾何 / 射影構造 / 平坦 / 左不変 / リー群 / リー環 / 不変式 / 表現 / 平坦な射影構造 / 慨平坦 / リッチテンソル / ユニモジュラーリー群 / 可解リー群
Research Abstract

We study several conditions on homogeneous spaces (or Lie groups) in order that they admit flat geometric structures from the standpoint of invariant theory. In this research, we treat mainly projective and pseudo-Riemannian structures, and we succeed to obtain several necessary conditions to admit flat geometric structures for some cases. We also construct new homogeneous spaces admitting flat projective structures by using representation theory, and in addition, determine the existence or non-existence of almost flat pseudo-Riemannian structures on each 3-dimensional Lie group.

Report

(4 results)
  • 2009 Annual Research Report   Final Research Report ( PDF )
  • 2008 Annual Research Report
  • 2007 Annual Research Report
  • Research Products

    (30 results)

All 2010 2009 2008 2007 Other

All Journal Article (17 results) (of which Peer Reviewed: 14 results) Presentation (13 results)

  • [Journal Article] 3次元リー群上の左不変概平坦な計量について2010

    • Author(s)
      阿賀岡芳夫
    • Journal Title

      名城大学幾何学研究集会「多様体上の種々の幾何構造とその応用」アブストラクト

      Pages: 51-58

    • Related Report
      2009 Final Research Report
  • [Journal Article] Degree of triangle centers and a generalization of the Euler line2010

    • Author(s)
      Y. Agaoka
    • Journal Title

      Beitrage Algebra Geom. Vol.51,No.1

      Pages: 63-89

    • Related Report
      2009 Final Research Report
    • Peer Reviewed
  • [Journal Article] Degree of triangle centers and a generalization of the Euler line2010

    • Author(s)
      Y. Agaoka
    • Journal Title

      Beitrage Algebra and Geometry (掲載決定)

    • Related Report
      2009 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Elliptic quantum group U_p, q (sl_2), Hopf algebroid structure and elliptic hypergeometric series2009

    • Author(s)
      H. Konno
    • Journal Title

      J. Geom. Phys. Vol.59

      Pages: 1485-1511

    • Related Report
      2009 Final Research Report
    • Peer Reviewed
  • [Journal Article] 3角形の諸心とその不変量2008

    • Author(s)
      阿賀岡芳夫
    • Journal Title

      部分多様体論・湯沢2008」アブストラクト

      Pages: 19-24

    • Related Report
      2009 Final Research Report
  • [Journal Article] Local isometric imbeddings of Riemannian symmetric spaces and their rigidity2008

    • Author(s)
      Y. Agaoka, E. Kaneda
    • Journal Title

      Sugaku Expositions Vol.21,No.1

      Pages: 33-54

    • Related Report
      2009 Final Research Report
    • Peer Reviewed
  • [Journal Article] Elliptic quantum group U_p, q (sl_2) and vertex operators2008

    • Author(s)
      H. Konno
    • Journal Title

      J. Phys. A Math. Theoret. Vol.41

      Pages: 194012-194012

    • Related Report
      2009 Final Research Report
    • Peer Reviewed
  • [Journal Article] Lie groups locally isomorphic to generalized Heisenberg groups2008

    • Author(s)
      H. Tamaru, H. Yoshida
    • Journal Title

      Proc. Amer. Math. Soc. Vol.136,No.9

      Pages: 3247-3254

    • Related Report
      2009 Final Research Report
    • Peer Reviewed
  • [Journal Article] oncompact homogeneous Einstein manifolds attached to graded Lie algebras2008

    • Author(s)
      H. Tamaru
    • Journal Title

      Math. Z. Vol.259,No.1

      Pages: 171-186

    • Related Report
      2009 Final Research Report
    • Peer Reviewed
  • [Journal Article] Local isometric imbeddings of Riemannian symmetric spaces and their rigidity2008

    • Author(s)
      Y. Agaoka
    • Journal Title

      Sugaku Expositions 21

      Pages: 33-54

    • Related Report
      2008 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Lie groups locally isomorphic to generalized Heisenberg groups2008

    • Author(s)
      H. Tamaru
    • Journal Title

      Proc. Amer. Math. Soc. 136

      Pages: 3247-3254

    • Related Report
      2008 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Rigidity of the canonical isometric imbedding of the Hermitian symmetric space Sp(n)/U(n)2007

    • Author(s)
      Y. Agaoka, E. Kaneda
    • Journal Title

      Hokkaido Math. J. vol.36,No.3

      Pages: 615-640

    • Related Report
      2009 Final Research Report
    • Peer Reviewed
  • [Journal Article] 等長埋め込みの剛性について2007

    • Author(s)
      阿賀岡芳夫, 兼田英二
    • Journal Title

      「Symplectic Geometryとその周辺」講演予稿集

      Pages: 76-8

    • Related Report
      2009 Final Research Report
  • [Journal Article] Cohomogeneity one actions on noncompact symmetric spaces of rank one2007

    • Author(s)
      H. Tamaru, J. Berndt
    • Journal Title

      Trans. Amer. Math. Vol.359,No.7

      Pages: 3425-3438

    • Related Report
      2009 Final Research Report
    • Peer Reviewed
  • [Journal Article] Rigidity of the canonical isometric imbedding of the symplectic group Sp (n)2007

    • Author(s)
      Y. Agaoka
    • Journal Title

      Hokkaido Mathematical Journal 36

      Pages: 79-110

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Rigidity of the canonical isometric imbedding of the Hermitian symmetric spaces Sp (n) / U (n)2007

    • Author(s)
      Y. Agaoka
    • Journal Title

      Hokkaido Mathematical Journal 36

      Pages: 615-640

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Triangle centers defined by quadratic polynomials

    • Author(s)
      Y. Agaoka
    • Journal Title

      Math. J. Okayama Univ. (掲載決定)

    • Related Report
      2009 Final Research Report
    • Peer Reviewed
  • [Presentation] リー群上の左不変平坦な射影構造と不変式2010

    • Author(s)
      阿賀岡芳夫, 加藤宏尚
    • Organizer
      日本数学会
    • Place of Presentation
      慶応義塾大学
    • Year and Date
      2010-03-26
    • Related Report
      2009 Annual Research Report 2009 Final Research Report
  • [Presentation] 3角形の心のある標準的な集合について2010

    • Author(s)
      阿賀岡芳夫
    • Organizer
      日本数学会
    • Place of Presentation
      慶応義塾大学
    • Year and Date
      2010-03-26
    • Related Report
      2009 Final Research Report
  • [Presentation] 3次元リー群上の左不変概平坦な計量について2010

    • Author(s)
      阿賀岡芳夫
    • Organizer
      多様体上の種々の幾何構造とその応用
    • Place of Presentation
      名城大学
    • Year and Date
      2010-03-11
    • Related Report
      2009 Final Research Report
  • [Presentation] 2次式で定まる3角形の心と主直線2010

    • Author(s)
      阿賀岡芳夫
    • Organizer
      研究会「直観幾何学」
    • Place of Presentation
      熊本大学
    • Year and Date
      2010-02-13
    • Related Report
      2009 Final Research Report
  • [Presentation] 2次式で定まる3角形の心と, central lines2009

    • Author(s)
      阿賀岡芳夫
    • Organizer
      日本数学会
    • Place of Presentation
      大阪大学
    • Year and Date
      2009-09-25
    • Related Report
      2009 Final Research Report
  • [Presentation] オイラー線上の心を, 不変量で特徴付ける2009

    • Author(s)
      阿賀岡芳夫
    • Organizer
      日本数学会
    • Place of Presentation
      東京大学
    • Year and Date
      2009-03-28
    • Related Report
      2009 Final Research Report
  • [Presentation] オイラー線の一般化と, 3角形の心の次数2008

    • Author(s)
      阿賀岡芳夫
    • Organizer
      熊本幾何セミナー
    • Place of Presentation
      熊本大学
    • Year and Date
      2008-12-12
    • Related Report
      2009 Final Research Report
  • [Presentation] 3角形の諸心とその不変量2008

    • Author(s)
      阿賀岡芳夫
    • Organizer
      部分多様体論湯沢・2008
    • Place of Presentation
      湯沢グランドホテル
    • Year and Date
      2008-11-28
    • Related Report
      2009 Final Research Report
  • [Presentation] オイラー線の一般化と, 3角形の心の次数2008

    • Author(s)
      阿賀岡芳夫
    • Organizer
      日本数学会
    • Place of Presentation
      東京工業大学
    • Year and Date
      2008-09-26
    • Related Report
      2009 Final Research Report 2008 Annual Research Report
  • [Presentation] リー群上の左不変平坦な幾何構造2008

    • Author(s)
      阿賀岡芳夫
    • Organizer
      幾何学阿蘇研究集会
    • Place of Presentation
      休暇村南阿蘇
    • Year and Date
      2008-09-03
    • Related Report
      2009 Final Research Report
  • [Presentation] 3角形の「心」の次数, オイラー線の拡張2008

    • Author(s)
      阿賀岡芳夫
    • Organizer
      森本徹先生御退官記念研究集会
    • Place of Presentation
      奈良女子大学
    • Year and Date
      2008-03-18
    • Related Report
      2009 Final Research Report
  • [Presentation] 対称空間の局所等長埋め込み, 曲率不変量, 剛性2007

    • Author(s)
      阿賀岡芳夫
    • Organizer
      岡山幾何学談話会
    • Place of Presentation
      岡山理科大学
    • Year and Date
      2007-11-30
    • Related Report
      2009 Final Research Report
  • [Presentation] 等長埋め込みの剛性について2007

    • Author(s)
      阿賀岡芳夫, 兼田英二
    • Organizer
      Symplectic Geometryとその周辺
    • Place of Presentation
      岐阜経済大学
    • Year and Date
      2007-11-14
    • Related Report
      2009 Final Research Report

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Published: 2007-04-01   Modified: 2016-04-21  

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