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Study of invariant Einstein metics on compact homogeneous spaces

Research Project

Project/Area Number 16K05130
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Geometry
Research InstitutionOsaka University

Principal Investigator

sakane yusuke  大阪大学, その他部局等, 名誉教授 (00089872)

Research Collaborator Andreas Arvanitoyeorgos  
Marina Statha  
Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2017: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2016: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords等質アインシュタイン計量 / コンパクト単純リー群 / Stiefel多様体 / リッチテンソル / グレブナー基底 / 一般化された旗多様体 / 一般化されたWallach空間 / アインシュタイン計量 / コンパクト等質空間 / Stiefel 多様体 / 一般化されたWallack空間 / リッチ曲率 / 幾何学 / アインシュタイン多様体 / コンパクトリー群
Outline of Final Research Achievements

For invariant Einstein metrics on compact homogeneous spaces, the cases of simple Lie groups and Stiefel manifolds are mainly studied. In 1979 D'Atri and Ziller investigated naturally reductive Einstein metrics on compact Lie groups and produced a large number of such Einstein metrics. They also asked whether there exist Einstein metrics on compact Lie groups that are not naturally reductive.
We have worked here these problems. We have shown the existence of new Einstein metrics on SU(n) which are not naturally reductive, by using generalized flag manifolds and generalized Wallach spaces. We have also shown the existence of new Einstein metrics on Stiefel manifolds.

Academic Significance and Societal Importance of the Research Achievements

D’AtriとZillerの提出したアインシュタイン計量の存在問題に関して、本研究により、未解決であった SU(5) の場合が解決し、残りは SU(3), SU(4), SO(5)の3つの場合になった。これまでは、アインシュタイン計量を調べるためのリッチテンソルの形は、対角化されていたが、本研究では、対角成分以外の成分を調べる方法が必要となり、これを含めて研究し、成果を得ることができた。また、Stiefel多様体についても、閉部分群をうまく取り不変な計量の範囲を適当なものにすることにより新しいアインシュタイン計量の存在を示せた点に学術的意義がある。

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (19 results)

All 2021 2019 2018 2017 2016 Other

All Int'l Joint Research (3 results) Journal Article (4 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 4 results,  Open Access: 1 results) Presentation (9 results) (of which Int'l Joint Research: 3 results,  Invited: 8 results) Remarks (3 results)

  • [Int'l Joint Research] University of Patras(ギリシャ)

    • Related Report
      2018 Annual Research Report
  • [Int'l Joint Research] パトラ大学(ギリシャ)

    • Related Report
      2017 Research-status Report
  • [Int'l Joint Research] パトラ大学(ギリシャ)

    • Related Report
      2016 Research-status Report
  • [Journal Article] Invariant Einstein metrics on SU(N) and complex Stiefel manifolds(掲載決定)2021

    • Author(s)
      Arvanitoyeorgos Andreas, Sakane Yusuke, Statha Marina
    • Journal Title

      Tohoku Mathematical Journal

      Volume: -

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] EINSTEIN METRICS ON SPECIAL UNITARY GROUPS SU(2n)(掲載決定)2019

    • Author(s)
      Arvanitoyeorgos Andreas, Sakane Yusuke, Statha Marina
    • Journal Title

      Recent Topics in Differential Geometry and its Related Fields, Proceedings of ICDG 2018, World Scientific

      Volume: - Pages: 1-23

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] New homogeneous Einstein metrics on quaternionic Stiefel manifolds2018

    • Author(s)
      Arvanitoyeorgos Andreas、Sakane Yusuke、Statha Marina
    • Journal Title

      Advances in Geometry

      Volume: 18 Issue: 4 Pages: 509-524

    • DOI

      10.1515/advgeom-2018-0014

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] HOMOGENEOUS EINSTEIN METRICS ON COMPLEX STIEFEL MANIFOLDS AND SPECIAL UNITARY GROUPS2017

    • Author(s)
      ARVANITOYEORGOS Andreas、SAKANE Yusuke、STATHA Marina
    • Journal Title

      Contemporary Perspectives in Differential Geometry and its Related Fields, Proceedings of the 5th International Colloquium on Differential Geometry and its Related Fields

      Volume: なし Pages: 1-20

    • DOI

      10.1142/9789813220911_0001

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Presentation] Invariant Einstein metrics on Stiefel manifolds2018

    • Author(s)
      坂根 由昌
    • Organizer
      The 5th workshop "Complex Geometry and Lie Groups"
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Homogeneous Einstein metrics on Stiefel manifolds2018

    • Author(s)
      坂根 由昌
    • Organizer
      The 6th meeting ICDG 2018 (International Colloquium on Differential Geometry)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] コンパクト等質空間上の不変なアインシュタイン計量について2018

    • Author(s)
      坂根由昌
    • Organizer
      第25回沼津改め静岡研究会
    • Related Report
      2017 Research-status Report
    • Invited
  • [Presentation] SU(n) 上の等質アインシュタイン計量について2017

    • Author(s)
      坂根由昌
    • Organizer
      日本数学会2017年度年会
    • Place of Presentation
      首都大学東京, 東京都八王子市
    • Year and Date
      2017-03-24
    • Related Report
      2016 Research-status Report
  • [Presentation] コンパクト等質空間上のアインシュタイン計量について2017

    • Author(s)
      坂根由昌
    • Organizer
      小磯憲史先生退職記念研究集会
    • Place of Presentation
      大阪大学大学院理学研究科, 大阪府豊中市
    • Year and Date
      2017-03-13
    • Related Report
      2016 Research-status Report
    • Invited
  • [Presentation] コンパクト単純リー群上の不変なアインシュタイン計量について2017

    • Author(s)
      坂根由昌
    • Organizer
      第24回 沼津研究会
    • Place of Presentation
      沼津工業高等専門学校, 静岡県沼津市
    • Year and Date
      2017-03-06
    • Related Report
      2016 Research-status Report
    • Invited
  • [Presentation] コンパクト単純リー群上の不変なアインシュタイン計量について2017

    • Author(s)
      坂根由昌
    • Organizer
      多様体上の計量と幾何構造
    • Place of Presentation
      名城大学天白キャンパス, 愛知県名古屋市
    • Year and Date
      2017-03-03
    • Related Report
      2016 Research-status Report
    • Invited
  • [Presentation] コンパクト等質空間上のアインシュタイン計量について2017

    • Author(s)
      坂根由昌
    • Organizer
      山口佳三先生退職記念研究集会
    • Related Report
      2017 Research-status Report
    • Invited
  • [Presentation] New homogeneous Einstein metrics on SU(N)2016

    • Author(s)
      坂根由昌
    • Organizer
      ICDG2016
    • Place of Presentation
      Veliko Tarnovo University, Veliko Tarnovo, Bulgaria
    • Year and Date
      2016-09-06
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research / Invited
  • [Remarks] Yusuke Sakane

    • URL

      http://www4.math.sci.osaka-u.ac.jp/~sakane/

    • Related Report
      2018 Annual Research Report
  • [Remarks]

    • URL

      http://www.math.sci.osaka-u.ac.jp/~sakane/

    • Related Report
      2017 Research-status Report
  • [Remarks] Yusuke Sakane

    • URL

      http://www.math.sci.osaka-u.ac.jp/~sakane/

    • Related Report
      2016 Research-status Report

URL: 

Published: 2016-04-21   Modified: 2020-03-30  

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