TAMARU Hiroshi

写真a

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Title

Professor

Laboratory location

Sugimoto Campus

Research Areas 【 display / non-display

GEOMETRY

Association Memberships 【 display / non-display

  • The Mathematical Society of Japan

Current Career 【 display / non-display

  • Osaka City University   Graduate School of Science   Mathematics and Physics Course   Professor  

 

Published Papers 【 display / non-display

  • Moment maps and isoparametric hypersurfaces in spheres --- some recent results

    Shinobu Fujii, Hiroshi Tamaru

    Proceedings of the 22nd International Workshop on Differential Geometry of Submanifolds in Symmetric Spaces and Related Problems  2019  [Invited]

  • Dynkin indices for totally geodesic submanifolds in compact symmetric spaces

    Takayuki Okuda, Akira Kubo, Hiroshi Tamaru

    Proceedings of the 22nd International Workshop on Differential Geometry of Submanifolds in Symmetric Spaces and Related Problems    195 - 200 2019  [Invited]

  • Curvature properties of homogeneous real hypersurfaces in nonflat complex space forms

    Sadahiro Maeda, Hiroshi Tamaru, Hiromasa Tanabe

    Kodai Mathematical Journal  41 ( 2 ) 315 - 331 2018  [Refereed]

  • On the nonexistence of left-invariant Ricci solitons --- a conjecture and examples

    Yuichiro Taketomi, Hiroshi Tamaru

    Transformation Groups  23 ( 1 ) 257 - 270 2018  [Refereed]

  • Realizations of some contact metric manifolds as Ricci soliton real hypersurfaces

    Jong Taek Cho, Takahiro Hashinaga, Akira Kubo, Yuichiro Taketomi, Hiroshi Tamaru

    Journal of Geometry and Physics  123   221 - 234 2018  [Refereed]

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Conference Activities & Talks 【 display / non-display

  • Left-invariant metrics and submanifold geometry of noncompact symmetric spaces

    Hiroshi Tamaru  [Invited]

    AMS Special Session on Differential Geometry and Global Analysis, Honoring the Memory of Tadashi Nagano (1930-2017)  (olorado Convention Center)  2020.01 

  • Geometry of homogeneous hypersurfaces in noncompact symmetric spaces

    Hiroshi Tamaru  [Invited]

    Symmetry and shape - Celebrating the 60th birthday of Prof. J. Berndt  (Universidade de Santiago de Compostela)  2019.10 

  • Moment maps and isoparametric hypersurfaces in spheres --- some recent results

    Hiroshi Tamaru  [Invited]

    The 22nd International Workshop on Differential Geometry of Submanifolds in Symmetric Spaces and Related Problems  (Kyungpook National University)  2019.08 

  • On the moduli spaces of left-invariant geometric structures

    Hiroshi Tamaru  [Invited]

    Workshop on geometric analysis and homogeneous geometry  (The University of Queensland)  2019.06 

  • Moment maps and isoparametric hypersurfaces in spheres

    Hiroshi Tamaru  [Invited]

    Workshop on the Isoparametric Theory  (Beijing Normal University)  2019.06 

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Grant-in-Aid for Scientific Research 【 display / non-display

  • Quandles and discrete symmetric spaces

    Project/Area Number : 24654012  Grant-in-Aid for challenging Exploratory Research Representative

    Project Year :

    2012.04
    -
    2015.03
     

    Partaker : AGAOKA Yoshio, SHIBUYA Kazuhiro, KAMADA Seiichi

     View Summary

    We introduced the notion of two-point homogeneous quandles, which is an analogy of the notion of two-point homogeneous Riemannian manifolds, and classified those with finite cardinality (The prime cardinality case has been completed by the Principal Investigator, and other case by a Research Partner). We also defined the notion of flat quandles, and classified finite connected ones. The notion of flatness was not defined by curvatures, but a characterization of flat Riemannian symmetric spaces in terms of the transformation groups.

  • Geometry of solvable Lie groups and submanifold geometry

    Project/Area Number : 20740040  Grant-in-Aid for Young Scientists(B) Representative

    Project Year :

    2008
    -
    2011
     

     View Summary

    We established a framework for studying left-invariant Riemannian metrics on Lie groups in terms of submanifold geometry. As applications, we have obtained a general procedure to get Milnor-type theorems, and a characterization of algebraic Ricci solitons in terms of submanifold geometry in three-dimensional cases. We have also studied homogeneous submanifolds in noncompact symmetric spaces, and obtained a classification of hyperpolar foliations and a rough classification of cohomogeneity one actions. Results on geometric properties of some particular submanifolds have also been obtained.

 

Other educational activity and Special note 【 display / non-display

  • Contribution to FD activities

    (2020)

  • Class teacher

    (2020)

 

Foreigner acceptance 【 display / non-display

  • Academic year : 2020

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    Number of foreigners accepted
    1
    Number of International Students
    1

    China

  • Academic year : 2019

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    Number of foreigners accepted
    1
    Number of International Students
    1

    China

  • Academic year : 2018

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    Number of foreigners accepted
    1

    China