Updated on 2024/03/30

写真a

 
TAMARU Hiroshi
 
Organization
Graduate School of Science Department of Mathematics Professor
School of Science Department of Mathematics
Title
Professor
Affiliation
Institute of Science

Position

  • Graduate School of Science Department of Mathematics 

    Professor  2022.04 - Now

  • School of Science Department of Mathematics 

    Professor  2022.04 - Now

Degree

  • 博士(理学) ( Sophia University )

Research Areas

  • Natural Science / Geometry  / GEOMETRY

Professional Memberships

  • The Mathematical Society of Japan

      Domestic

Committee Memberships (off-campus)

  • 連携会員   日本学術会議  

    2023.10 - Now 

  • 評議員(中国・四国支部)   日本数学会  

    2018.03 - 2019.02 

  • 拡大幹事会委員   日本数学会幾何学分科会  

    2011.08 - Now 

Papers

  • On the moduli spaces of left-invariant Riemannian metrics on Lie groups --- a report on the one-dimensional case Invited

    Hiroshi Tamaru

    Proceedings of The 24th International Workshop on Differential Geometry & Related Fields   249 - 257   2023.11

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    Publishing type:Research paper (international conference proceedings)  

  • A classification of left-invariant Lorentzian metrics on some nilpotent Lie groups Reviewed

    Yuji Kondo, Hiroshi Tamaru

    Tohoku Mathematical Journal   75 ( 1 )   89 - 117   2023.03

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    Publishing type:Research paper (scientific journal)   International / domestic magazine:International journal  

    DOI: 10.2748/tmj.20211122

  • 左不変リーマン計量のモジュライ空間が1 次元となるLie 群について Invited

    部分多様体幾何とリー群作用 2022 記録集   137 - 149   2023

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    Publishing type:Research paper (conference, symposium, etc.)  

  • A classification of left-invariant symplectic structures on some Lie groups Reviewed International coauthorship

    Luis Pedro Castellanos Moscoso, Hiroshi Tamaru

    Beiträge zur Algebra und Geometrie   64 (2023)   471 - 491   2022.05

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    Authorship:Lead author, Last author, Corresponding author   Publishing type:Research paper (scientific journal)   International / domestic magazine:International journal  

    DOI: 10.1007/s13366-022-00643-1

  • A Lie theoretic interpretation of realizations of some contact metric manifolds Invited Reviewed

    Takahiro Hashinaga, Akira Kubo, Yuichiro Taketomi, Hiroshi Tamaru

    New Horizons in Differential Geometry and Its Related Fields   71 - 90   2022.05

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    Publishing type:Research paper (international conference proceedings)   International / domestic magazine:International journal  

    DOI: 10.1142/9789811248108_0005

  • A commutativity condition for subsets in quandles --- a generalization of antipodal subsets Invited Reviewed

    Akira Kubo, Mika Nagashiki, Takayuki Okuda, Hiroshi Tamaru

    Contemporary Mathematics   777   103 - 125   2022.05

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    Publishing type:Research paper (scientific journal)   International / domestic magazine:International journal  

    DOI: 10.1090/conm/777/15631

  • Quandles from the viewpoint of symmetric spaces --- a survey Invited

    Hiroshi Tamaru

    OCAMI Reports 2021   9   100 - 113   2022.02

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    Publishing type:Research paper (conference, symposium, etc.)  

    DOI: 10.24544/ocu.20220209-001

  • Codimension one Ricci soliton subgroups of solvable Iwasawa groups Reviewed

    Dominguez-Vazquez Miguel, Sanmartin-Lopez Victor, Tamaru Hiroshi

    JOURNAL DE MATHEMATIQUES PURES ET APPLIQUEES   152   69 - 93   2021.08( ISSN:0021-7824

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.matpur.2021.05.008

  • Remarks on totally geodesic complex curves in Hermitian symmetric spaces Invited

    Akira Kubo, Takayuki Okuda, Hiroshi Tamaru

    Proceedings of The 23rd International Differential Geometry Workshop on Submanifolds in Homogeneous Spaces & Related Topics   129 - 139   2021

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    Publishing type:Research paper (international conference proceedings)   Kind of work:Joint Work  

  • Dynkin indices for totally geodesic submanifolds in compact symmetric spaces Invited

    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

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    Publishing type:Research paper (international conference proceedings)   Kind of work:Joint Work   International / domestic magazine:International journal  

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

    Shinobu Fujii, Hiroshi Tamaru

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

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    Publishing type:Research paper (international conference proceedings)   Kind of work:Joint Work  

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

    Sadahiro Maeda, Hiroshi Tamaru, Hiromasa Tanabe

    Kodai Mathematical Journal   41 ( 2 )   315 - 331   2018

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    Publishing type:Research paper (scientific journal)   Kind of work:Joint Work  

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

    Yuichiro Taketomi, Hiroshi Tamaru

    Transformation Groups   23 ( 1 )   257 - 270   2018

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    Publishing type:Research paper (scientific journal)   Kind of work:Joint Work  

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

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

    Journal of Geometry and Physics   123   221 - 234   2018

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    Publishing type:Research paper (scientific journal)   Kind of work:Joint Work  

  • The solvable models of noncompact real two-plane Grassmannians and some applications Invited Reviewed International coauthorship

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

    Springer Proceedings in Mathematics & Statistics   203   311 - 321   2017

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    Publishing type:Research paper (international conference proceedings)   Kind of work:Joint Work  

  • Three-dimensional solvsolitons and the minimality of the corresponding submanifolds Reviewed

    Takahiro Hashinaga, Hiroshi Tamaru

    International Journal of Mathematics   28 ( 6 )   1750048   2017

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    Publishing type:Research paper (scientific journal)   Kind of work:Joint Work  

  • On the moduli spaces of left-invariant pseudo-Riemannian metrics on Lie groups Reviewed

    Akira Kubo, Kensuke Onda, Yuichiro Taketomi, Hiroshi Tamaru

    Hiroshima Mathematical Journal   46 ( 3 )   357 - 374   2016.11

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    Publishing type:Research paper (scientific journal)   Kind of work:Joint Work  

  • On Classification of Quandles of Cyclic Type Reviewed

    Kamada Seiichi, Tamaru Hiroshi, Wada Koshiro

    TOKYO JOURNAL OF MATHEMATICS   39 ( 1 )   157 - 171   2016.06( ISSN:0387-3870

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    Publishing type:Research paper (scientific journal)  

  • Milnor-type theorems for left-invariant Riemannian metrics on Lie groups Reviewed

    Takahiro Hashinaga, Hiroshi Tamaru, Kazuhiro Terada

    Journal of the Mathematical Society of Japan   68 ( 2 )   669 - 684   2016.04

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    Publishing type:Research paper (scientific journal)   Kind of work:Joint Work  

  • The space of left-invariant Riemannian metrics Invited Reviewed

    Hiroshi Tamaru

    Springer Proceedings in Mathematics & Statistics   154   315 - 326   2016

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    Publishing type:Research paper (international conference proceedings)   Kind of work:Single Work  

  • Flat connected finite quandles Reviewed

    Yoshitaka Ishihara, Hiroshi Tamaru

    Proceedings of the American Mathematical Society   144 ( 11 )   4959 - 4971   2016

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    Publishing type:Research paper (scientific journal)   Kind of work:Joint Work  

  • Homogeneous Ricci soliton hypersurfaces in the complex hyperbolic spaces Reviewed

    Takahiro Hashinaga, Akira Kubo, Hiroshi Tamaru

    Tohoku Mathematical Journal   68 ( 4 )   559 - 568   2016

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    Publishing type:Research paper (scientific journal)   Kind of work:Joint Work  

  • Naturally reductive homogeneous real hypersurfaces in a nonflat complex space form Invited Reviewed

    Sadahiro Maeda, Hiroshi Tamaru

    Topology and its Applications   196 ( B )   675 - 683   2015.12

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    Publishing type:Research paper (international conference proceedings)   Kind of work:Joint Work  

  • Moment maps and isoparametric hypersurfaces in spheres --- Hermitian cases Reviewed

    Shinobu Fujii, Hiroshi Tamaru

    Transformation Groups   20 ( 2 )   417 - 436   2015.06

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    Publishing type:Research paper (scientific journal)   Kind of work:Joint Work  

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Presentations

  • リー群上の左不変な幾何構造について:モジュライ空間と特別な構造の存在・非存在問題 Invited Domestic conference

    名工大幾何学講演会 2024  2024.03 

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    Presentation type:Oral presentation (invited, special)  

    Venue:名古屋工業大学  

  • Left-invariant geometric structures on Lie groups and their moduli spaces Invited International conference

    Hiroshi Tamaru

    The 4th International Conference on Geometry, Analysis, and Numerics in Differential Geometry  2024.02 

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    Presentation type:Oral presentation (invited, special)  

    Venue:Rexxam Hall, Kagawa  

  • リー群上の左不変な幾何構造について:モジュライ空間と特別な構造の存在・非存在問題 Invited Domestic conference

    立命館大学幾何学セミナー  2024.01 

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    Presentation type:Oral presentation (invited, special)  

    Venue:立命館大学  

  • Quandles from the viewpoint of symmetric spaces Invited Domestic conference

    Hiroshi Tamaru

    2023.11 

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    Presentation type:Oral presentation (invited, special)  

  • Quandles from the viewpoint of symmetric spaces Invited International conference

    Hiroshi Tamaru

    7th Tunisian-Japanese Conference: Geometric and Harmonic Analysis on Homogeneous Spaces and Applications  2023.11 

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    Presentation type:Oral presentation (invited, special)  

    Venue:Monastir, Tunisia  

  • On the moduli spaces of left-invariant Riemannian metrics on Lie groups Invited International conference

    Hiroshi Tamaru

    Representation Theory and Differential Geometry on homogeneous spaces  2023.09 

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    Presentation type:Oral presentation (invited, special)  

    Venue:Osaka Metropolitan University  

  • On the moduli spaces of left-invariant Riemannian metrics on Lie groups Invited International conference

    Hiroshi Tamaru

    The 21st OCAMI-RIRCM Joint Differential Geometry Workshop  2023.08 

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    Presentation type:Oral presentation (invited, special)  

    Venue:Pukyong National University, Korea  

  • On the moduli spaces of left-invariant Riemannian metrics on Lie groups Invited International conference

    Hiroshi Tamaru

    Mini-Workshop: Global Analysis and Geometry  2023.03 

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    Presentation type:Oral presentation (invited, special)  

    Venue:Osaka Metropolitan University  

  • Lie groups whose moduli spaces of left-invariant Riemannian metrics are one-dimensional Invited Domestic conference

    Hiroshi Tamaru

    2023.03 

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    Presentation type:Oral presentation (invited, special)  

  • Geometry of some nilpotent Lie groups with left-invariant metrics Invited Domestic conference

    Hiroshi Tamaru

    2022.11 

  • Introduction to quandles and discrete symmetric spaces Invited International conference

    Hiroshi Tamaru

    Geometry of symmetric spaces and group actions  2022.02 

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    Presentation type:Oral presentation (invited, special)  

  • Codimension one Ricci soliton subgroups of solvable Iwasawa groups Invited International conference

    Hiroshi Tamaru

    The 6th China-Japan Geometry Conference  2021.12 

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    Presentation type:Oral presentation (invited, special)  

  • Milnor-type theorems for left-invariant pseudo-Riemannian metrics Invited Domestic conference

    Hiroshi Tamaru

    Workshop: 擬リーマン多様体の幾何の諸相   2021.12 

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    Presentation type:Oral presentation (invited, special)  

  • Introduction to quandles from the viewpoint of symmetric spaces Invited Domestic conference

    Hiroshi Tamaru

    北海道大学幾何学コロキウム  2021.11 

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    Presentation type:Oral presentation (invited, special)  

  • Quandles from the viewpoint of symmetric spaces - a survey Invited Domestic conference

    Hiroshi Tamaru

    カンドルと対称空間  2021.11 

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    Presentation type:Oral presentation (invited, special)  

  • Codimension one Ricci soliton subgroups of solvable Iwasawa groups Invited Domestic conference

    Hiroshi Tamaru

    対称空間と群作用の幾何学  2021.09 

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    Presentation type:Oral presentation (invited, special)  

  • Totally geodesic surfaces in symmetric spaces and applications Invited International conference

    Hiroshi Tamaru

    The 23rd International Differential Geometry Workshop on Submanifolds in Homogeneous Spaces and Related Topics - The 19th RIRCM-OCAMI Joint Differential Geometry Workshop  2021.07 

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    Presentation type:Oral presentation (invited, special)  

  • A commutativity condition for subsets in symmetric spaces and quandles Invited Domestic conference

    Hiroshi Tamaru

    部分多様体論と関連する幾何構造研究の深化と融合  2021.06 

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    Presentation type:Oral presentation (invited, special)  

  • Codimension one Ricci soliton subgroups of solvable Iwasawa groups Invited Domestic conference

    Hiroshi Tamaru

    部分多様体幾何とリー群作用 2020   2021.03 

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    Presentation type:Oral presentation (general)  

  • A commutativity condition for subsets in quandles --- a generalization of antipodal subsets Invited Domestic conference

    Hiroshi Tamaru

    筑波大学微分幾何学セミナー (online)  2021.01 

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    Presentation type:Oral presentation (general)  

  • Quandles and discrete symmetric spaces Invited Domestic conference

    Hiroshi Tamaru

    第15回代数・解析・幾何学セミナー  2020.02 

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    Presentation type:Oral presentation (general)  

    Venue:鹿児島大学  

  • Quandles and discrete symmetric spaces Invited Domestic conference

    Hiroshi Tamaru

    淡路島幾何学研究集会 2020  2020.01 

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    Presentation type:Oral presentation (general)  

    Venue:南あわじ市阿那賀地区公民館  

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

    Hiroshi Tamaru

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

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    Presentation type:Oral presentation (general)  

    Venue:olorado Convention Center  

  • Geometry of homogeneous hypersurfaces in noncompact symmetric spaces Invited International conference

    Hiroshi Tamaru

    Symmetry and shape - Celebrating the 60th birthday of Prof. J. Berndt  2019.10 

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    Presentation type:Oral presentation (general)  

    Venue:Universidade de Santiago de Compostela  

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

    Hiroshi Tamaru

    The 22nd International Workshop on Differential Geometry of Submanifolds in Symmetric Spaces and Related Problems  2019.08 

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    Presentation type:Oral presentation (general)  

    Venue:Kyungpook National University  

  • On the moduli spaces of left-invariant geometric structures Invited International conference

    Hiroshi Tamaru

    Workshop on geometric analysis and homogeneous geometry  2019.06 

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    Presentation type:Oral presentation (general)  

    Venue:The University of Queensland  

  • Geometry of homogeneous hypersurfaces in noncompact symmetric spaces Invited Domestic conference

    Hiroshi Tamaru

    第2回水戸幾何小研究集会  2019.06 

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    Presentation type:Oral presentation (general)  

    Venue:茨城大学  

  • Moment maps and isoparametric hypersurfaces in spheres Invited International conference

    Hiroshi Tamaru

    Workshop on the Isoparametric Theory  2019.06 

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    Presentation type:Oral presentation (general)  

    Venue:Beijing Normal University  

  • サッカーの幾何学:変分法に基づくゴールキーパーの最適位置 Domestic conference

    Hiroshi Tamaru

    淡路島幾何学研究集会 2019  2019.01 

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    Presentation type:Oral presentation (general)  

  • カンドルおよび対称空間内のある種の部分集合 Invited Domestic conference

    Hiroshi Tamaru

    部分多様体論・湯沢2018  2018.11 

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    Presentation type:Oral presentation (invited, special)  

  • Symmetric spaces, submanifold geometry, and left-invariant metrics Domestic conference

    Hiroshi Tamaru

    大阪市立大学数学研究所談話会  2018.10 

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    Presentation type:Oral presentation (general)  

  • Discrete symmetric spaces, quandles, and their subsets Domestic conference

    Hiroshi Tamaru

    広島大学数学教室談話会  2018.07 

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    Presentation type:Oral presentation (general)  

  • Flat quandles, graphs, and subsets in symmetric spaces Invited Domestic conference

    Hiroshi Tamaru

    第35回代数的組合せ論シンポジウム  2018.06 

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    Presentation type:Oral presentation (invited, special)  

    Venue:広島工業大学  

  • Examples of weakly reflective submanifolds in noncompact symmetric spaces International conference

    Hiroshi Tamaru

    Hiroshima Differential Geometry Day 2018  2018.04 

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    Presentation type:Oral presentation (general)  

    Venue:Hiroshima University  

  • Left-invariant pseudo-Riemannian metrics on some Lie groups Invited International conference

    Hiroshi Tamaru

    Geometry of Submanifolds and Integrable Systems  2018.03 

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    Presentation type:Oral presentation (invited, special)  

    Venue:Osaka City University  

  • Flat quandles and finite subsets in symmetric spaces Invited Domestic conference

    Hiroshi Tamaru

    Hakata Workshop Winter Meeting 2018: Discrete Mathematics and its Applications  2018.02 

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    Presentation type:Oral presentation (invited, special)  

    Venue:リファレンス駅東ビル  

  • Left-invariant pseudo-Riemannian metrics on some solvable Lie groups International conference

    Hiroshi Tamaru

    AMS Special Session on Nilpotent and Solvable Geometry  2018.01 

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    Presentation type:Oral presentation (general)  

    Venue:San Diego, California  

  • Symmetric spaces, submanifold geometry, and solvmanifolds Invited International conference

    Hiroshi Tamaru

    Capital Normal University-Hiroshima University Joint Conference on Mathematics  2017.09 

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    Presentation type:Oral presentation (invited, special)  

    Venue:Capital Normal University, China  

  • Left-invariant metrics and submanifold geometry Invited International conference

    Hiroshi Tamaru

    Lie Group Actions in Riemannian Geometry  2017.06 

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    Presentation type:Oral presentation (invited, special)  

    Venue:Dartmouth College, USA  

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Grant-in-Aid for Scientific Research

  • カンドルと対称空間と組み合わせ論の横断的研究

    Grant-in-Aid for Challenging Research (Pioneering)/(Exploratory)  2023.04

  • 対称空間の幾何学の深化と応用および離散化

    Grant-in-Aid for Scientific Research(B)  2023

  • 対称空間の幾何学の深化と応用および離散化

    Grant-in-Aid for Scientific Research(B)  2023

  • 対称空間の幾何学の深化と応用および離散化

    Grant-in-Aid for Scientific Research(B)  2022

  • カンドルと対称空間と組み合わせ論の横断的研究

    Grant-in-Aid for Challenging Research (Pioneering)/(Exploratory)  2022

  • リーマン多様体の局所等長埋め込み問題に現れる可積分条件と不変式

    Grant-in-Aid for Scientific Research(C)  2022

  • カンドルと対称空間と組み合わせ論の横断的研究

    挑戦的研究 (萌芽)  2019.04

  • カンドルおよび離散的対称空間の構造理論の構築

    Grant-in-Aid for Challenging Research (Pioneering)/(Exploratory)  2016.04

  • 等質リーマン多様体の局所等長埋め込みと可積分条件

    Grant-in-Aid for Scientific Research(C)  2016.04

  • 左不変な幾何構造の部分多様体論的研究

    Grant-in-Aid for Scientific Research(B)  2014.04

  • Quandles and discrete symmetric spaces

    Grant-in-Aid for Challenging Research (Pioneering)/(Exploratory)  2012.04

  • Geometry of solvable Lie groups and submanifold geometry

    Grant-in-Aid for Young Scientists(B)  2008

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Incentive donations / subsidies

  • 対称空間の部分多様体の微分幾何と関連する問題

    文部科学省  2020.04

Other subsidies, etc.

  • 共同利用・共同研究拠点形成事業費補助金(数学研究所)

    文部科学省  特色ある共同研究拠点の整備の推進事業~機能強化支援~  2023.04

Charge of on-campus class subject

  • 数学要論A

    2022   Weekly class   Undergraduate

  • 位相数学 II 演習

    2022   Weekly class   Undergraduate

  • 位相数学 II

    2022   Weekly class   Undergraduate

  • 位相数学 II 演習

    2021     Undergraduate

  • 位相数学 II

    2021     Undergraduate

  • 幾何学特論 I

    2021     Graduate school

  • 幾何学講義 I

    2021     Undergraduate

  • 解析 I

    2021     Undergraduate

  • 位相数学 I

    2020     Undergraduate

  • 位相数学 I 演習

    2020     Undergraduate

  • 幾何学講義 IV

    2020     Undergraduate

  • 幾何学特論 IV

    2020     Graduate school

  • 解析 I

    2019     Undergraduate

  • 位相数学 I

    2019     Undergraduate

  • 位相数学 I 演習

    2019     Undergraduate

  • 基礎数学 B

    2019     Undergraduate

  • 数学基礎演習 II

    2019     Undergraduate

  • 基礎数学 B

    2018     Undergraduate

  • 解析 II

    2018     Undergraduate

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Charge of off-campus class subject

  • 幾何学特別講義2

    2023.12
    Institution:Tokyo Metropolitan University

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    Level:Postgraduate 

  • 数学特別講義 1

    2022.11

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    Level:Undergraduate (specialized) 

Faculty development activities

  • FD活動への貢献  2020

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    FD 研修会「大学院数学教育および全学的数学教育における遠隔授業」開催

Number of instructed thesis, researches

  • 2023

    Number of instructed the graduation thesis:Number of graduation thesis reviews:2

    [Number of instructed the Master's Program] (previous term):[Number of instructed the Master's Program] (letter term):1

    [Number of master's thesis reviews] (chief):[Number of master's thesis reviews] (vice-chief):0

    [Number of doctoral thesis reviews] (chief):[Number of doctoral thesis reviews] (vice-chief):0

  • 2022

    [Number of instructed the Master's Program] (previous term):

    [Number of master's thesis reviews] (chief):[Number of master's thesis reviews] (vice-chief):2

    [Number of doctoral thesis reviews] (vice-chief):2

  • 2021

    Number of instructed the graduation thesis:Number of graduation thesis reviews:1

    [Number of instructed the Master's Program] (previous term):[Number of instructed the Master's Program] (letter term):1

    [Number of master's thesis reviews] (chief):[Number of master's thesis reviews] (vice-chief):3

    [Number of doctoral thesis reviews] (chief):[Number of doctoral thesis reviews] (vice-chief):1

Original item・Special report (Education Activity)

  • 2021

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    Original item:数学科2年生担任

  • 2020

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    Original item:数学科1年生担任

Foreigner acceptance

  • 2022

    foreigners accepted :1

  • 2021

    International Students :1

  • 2020

    foreigners accepted :1

    International Students :1

  • 2019

    foreigners accepted :1

    International Students :1

  • 2018

    foreigners accepted :1

Job title

  • Job title within the department

    Organization for Research Promotion 数学研究所 

    所長  2023.04