Updated on 2024/07/28

Information

 

写真a

 
MORITA YOSUKE
 
Organization
Faculty of Mathematics Division of Algebra and Geometry Associate Professor
School of Sciences Department of Mathematics(Joint Appointment)
Graduate School of Mathematics Department of Mathematics(Joint Appointment)
Joint Graduate School of Mathematics for Innovation (Joint Appointment)
Title
Associate Professor
Profile
様々な幾何学の話題に興味があります。これまでは次のようなことを研究してきました: 1) 等質空間 G/H に、G の離散部分群が固有かつ自由に作用するとき、商空間は G/H を局所的なモデルとする多様体になり、Clifford−Klein 形と呼ばれています。私は「非 Riemann な等質空間が、コンパクトな Clifford-Klein 形をいつ持つか?」という問題を、主にコホモロジー的な手法を用いて探究してきました。 2) 位相力学系の研究に現れる Conley 指数と呼ばれるホモトピー的な不変量の、より簡明な定式化を提案しました。 大まかには「ホモトピー論の枠組みを使って、Lie 群論・微分幾何・力学系など、狭義の代数トポロジーからは少し離れたところにある問題に取り組む」というのが私の数学上の好みです。

Degree

  • Ph.D. (Mathematical Sciences)

Research History

  • 2017年4月 〜 2023年3月:京都大学 大学院理学研究科 数学教室 助教

Research Interests・Research Keywords

  • Research theme:A new framework for Conley index theory

    Keyword:Conley index, topological dynamics, Morse theory, condensed set

    Research period: 2019.2

  • Research theme:Clifford-Klein forms of non-Riemannian homogeneous spaces

    Keyword:Lie groups, homogeneous space, Clifford-Klein form, proper action

    Research period: 2013.6

Papers

  • Conley index theory without index pairs. I: The point-set level theory Reviewed International journal

    Yosuke Morita

    Journal of Fixed Point Theory and Applications   25 ( 1 )   Paper No. 15   2023.2

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1007/s11784-022-01037-5, 10.48550/arXiv.2109.10588

  • Cartan projections of some non-reductive subgroups and proper actions on homogeneous spaces Reviewed International journal

    Yosuke Morita

    Transformation Groups   2022.6

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1007/s00031-022-09736-6

  • Proof of Kobayashi's rank conjecture on Clifford–Klein forms Reviewed International journal

    71 ( 4 )   1153 - 1171   2019.10

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.2969/jmsj/78007800, 10.48550/arXiv.1705.06544

  • A cohomological obstruction to the existence of compact Clifford–Klein forms Reviewed International journal

    23 ( 3 )   1931 - 1953   2017.7

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1007/s00029-016-0295-1, 10.48550/arXiv.1601.07359

  • A topological necessary condition for the existence of compace Clifford-Klein forms Reviewed International journal

    Yosuke Morita

    Journal of Differential Geometry   100 ( 3 )   533 - 545   2015.7

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.4310/jdg/1432842364, 10.48550/arXiv.1310.7096

  • Correction to: Conley index theory without index pairs. I: The point-set level theory Reviewed International journal

    Yosuke Morita

    Journal of Fixed Point Theory and Applications   26   2023.12

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1007/s11784-023-01094-4

    Other Link: https://doi.org/10.1007/s11784-023-01094-4

  • Semisimple symmetric spaces that do not model any compact manifold Reviewed International journal

    Yosuke Morita

    Journal of Lie Theory   29 ( 2 )   493 - 510   2019.5

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.48550/arXiv.1811.01495

  • Homogeneous spaces of nonreductive type that do not model any compact manifold Reviewed International journal

    Yosuke Morita

    Publications of the Research Institute for Mathematical Sciences   53 ( 2 )   287 - 298   2017.5

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.4171/PRIMS/53-2-3

  • Semisimple symmetric spaces without compact manifolds locally modelled thereon Reviewed International journal

    Yosuke Morita

    Proceedings of the Japan Academy, Series A, Mathematical Sciences   91 ( 2 )   29 - 33   2015.2

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.3792/pjaa.91.29

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Presentations

  • Conley index theory and condensed sets Invited International conference

    Yosuke Morita

    Arbeitstagung 2023 on Condensed Mathematics  2023.6 

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    Event date: 2023.6

    Language:English   Presentation type:Oral presentation (general)  

    Country:Germany  

    Other Link: https://www.mpim-bonn.mpg.de/node/11707

  • The existence problem of compact Clifford-Klein forms Invited International conference

    2017.11 

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    Language:English  

    Country:Other  

    The existence problem of compact Clifford-Klein forms

  • 非 Riemann 等質空間のコンパクト商のコホモロジー Invited

    森田 陽介

    日本数学会2018年度秋季総合分科会(幾何学分科会、特別講演)  2018.9 

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    Language:Japanese  

    Venue:岡山大学   Country:Other  

  • 非 Riemann 等質空間のコンパクト商の存在問題 Invited

    森田陽介

    第68回幾何学シンポジウム(基調講演)  2021.9 

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    Language:Japanese  

    Venue:北海道大学(オンライン)   Country:Japan  

  • The existence problem of compact quotients of homogeneous spaces Invited International conference

    Yosuke Morita

    2024.11 

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    Event date: 2024.11

    Language:English   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Country:France  

    Other Link: https://irma.math.unistra.fr/seminaires/seminaire-geometrie-et-applications.html

  • The existence problem of compact quotients of pseudo-Riemannian homogeneous spaces Invited International conference

    Yosuke Morita

    Zariski dense subgroups, number theory and geometric applications  2024.1 

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    Event date: 2024.1

    Language:English   Presentation type:Oral presentation (general)  

    Country:India  

    Other Link: https://www.icts.res.in/program/ZDSG

  • The existence problem of compact Clifford-Klein forms of pseudo-Riemannian homogeneous spaces Invited International conference

    Yosuke Morita

    7th Tunisian-Japanese Conference "Geometric and Harmonic Analysis on Homogeneous Spaces and Applications" in Honor of Professor Toshiyuki Kobayashi  2023.11 

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    Event date: 2023.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Tunisia  

    Other Link: https://sites.google.com/view/tunisian-japanese-conference/home/2023-7th

  • The existence problem of compact quotients of homogeneous spaces Invited International conference

    Yosuke Morita

    2023.11 

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    Event date: 2023.11

    Language:English   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Country:France  

    Other Link: https://www.imo.universite-paris-saclay.fr/en/events/7171

  • コンパクト商を持たない非 Riemann 等質空間について Invited

    森田 陽介

    第62回実函数論・函数解析学合同シンポジウム  2023.8 

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    Event date: 2023.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:千葉大学   Country:Japan  

  • Sphere bundles, KO-theory, and vector fields on spheres (after Adams)

    Workshop on "Actions of Reductive Groups and Global Analysis"  2023.8 

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    Event date: 2023.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Conley 指数の定義について Invited

    森田 陽介

    2023.6 

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    Event date: 2023.6

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:九州大学   Country:Japan  

    Other Link: https://sites.google.com/view/geometry-and-topology/

  • 非 Riemann 等質空間の Clifford-Klein 形の幾何学 Invited

    森田 陽介

    九州大学数理談話会  2023.5 

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    Event date: 2023.5

    Language:Japanese  

    Venue:九州大学   Country:Japan  

  • Conley 指数理論の新しい定式化について Invited

    森田 陽介

    幾何学・トポロジー合同セミナー(九州大学)  2023.4 

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    Event date: 2023.4

    Language:Japanese  

    Venue:九州大学   Country:Japan  

  • A new framework for Conley index theory Invited International conference

    Yosuke Morita

    Low dimensional topology and number theory XIV  2023.3 

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    Event date: 2023.3

    Language:English  

    Country:Japan  

    A new framework for Conley index theory

  • The Conley index of topological dynamical systems

    Yosuke Morita

    2021.12 

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    Event date: 2021.12

    Language:English  

    Country:Japan  

    The Conley index of topological dynamical systems

  • Cohomological obstructions to the existence of compact Clifford–Klein forms International conference

    Berkeley–Tokyo Winter School "Geometry, Topology and Representation Theory" (student session)  2016.2 

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    Event date: 2016.2

    Language:English  

    Venue:University of California, Berkeley(アメリカ合衆国、バークレー)   Country:United States  

  • Cohomological obstructions to the existence of compact Clifford–Klein forms International conference

    Mathematical Symposium ENS Lyon–Todai (poster session)  2015.6 

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    Event date: 2015.6

    Language:English  

    Venue:ENS de Lyon(フランス、リヨン)   Country:France  

  • 簡約型等質空間がコンパクト商を持つための位相的制約

    森田 陽介

    2013年度表現論シンポジウム  2013.11 

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    Language:Japanese  

    Venue:マホロバ・マインズ三浦   Country:Other  

  • 等質空間がコンパクト商を持つための位相的制約

    森田 陽介

    表現論と調和解析の新たな進展  2014.6 

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    Language:Japanese  

    Venue:京都大学数理解析研究所   Country:Other  

  • Y. Benoist "Actions propres sur les espaces homogènes réductifs" Chapitre 4 の解説

    森田 陽介

    リー群の表現論と群作用についての研究会  2014.8 

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    Language:Japanese  

    Venue:玉原国際セミナーハウス   Country:Other  

  • A necessary condition for the existence of compact manifolds locally modelled on homogeneous spaces Invited

    2014.8 

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    Language:Japanese  

    Country:Other  

    A necessary condition for the existence of compact manifolds locally modelled on homogeneous spaces

  • A necessary condition for the existence of compact manifolds locally modelled on homogeneous spaces Invited International conference

    Rigidity School, Tokyo 2014 (2nd)  2014.11 

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    Language:English  

    Country:Other  

    A necessary condition for the existence of compact manifolds locally modelled on homogeneous spaces

  • 等質空間を局所モデルとするコンパクト多様体が存在するための障害 Invited

    森田 陽介

    広島大学トポロジー・幾何セミナー  2014.12 

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    Language:Japanese  

    Venue:広島大学   Country:Other  

  • A necessary condition for the existence of compact manifolds locally modelled on homogeneous spaces Invited International conference

    Yosuke Morita

    2015 East Asian Core Doctorial Forum on Mathematics  2015.1 

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    Language:English  

    Country:Taiwan, Province of China  

  • Volume forms and compact Clifford-Klein forms Invited International conference

    2015.2 

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    Language:English  

    Country:Other  

    Volume forms and compact Clifford-Klein forms

  • 等質空間がコンパクト商を持つための位相的制約

    森田 陽介

    日本数学会2015年度年会(函数解析学分科会、一般講演)  2015.3 

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    Language:Japanese  

    Venue:明治大学   Country:Other  

  • Proper actions on corank-one reductive homogeneous spaces (after Kassel)

    2015.8 

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    Language:Japanese  

    Country:Other  

    Proper actions on corank-one reductive homogeneous spaces (after Kassel)

  • A new cohomological obstruction to the existence of compact Clifford-Klein forms

    2015.8 

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    Language:Japanese  

    Country:Other  

    A new cohomological obstruction to the existence of compact Clifford-Klein forms

  • Homogeneous spaces locally modelling no compact manifold Invited

    2015.10 

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    Language:Japanese  

    Country:Other  

    Homogeneous spaces locally modelling no compact manifold

  • コンパクト Clifford-Klein 形の存在問題について

    森田 陽介

    2015年度表現論シンポジウム  2015.11 

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    Language:English  

    Venue:公共の宿 おおとり荘   Country:Other  

  • 等質空間を局所モデルとするコンパクト多様体が存在するための障害

    森田 陽介

    日本数学会2016年度年会(幾何学分科会、一般講演)  2016.3 

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    Language:Japanese  

    Venue:筑波大学   Country:Other  

  • A cohomological obstruction to the existence of compact Clifford-Klein forms Invited International conference

    Geometric Analysis on Discrete Groups  2016.5 

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    Language:English  

    Country:Other  

    A cohomological obstruction to the existence of compact Clifford-Klein forms

  • A cohomological obstruction to the existence of compact Clifford-Klein forms Invited International conference

    Yosuke Morita

    Geometry and Topology Seminar (University of Luxembourg)  2016.6 

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    Language:English  

    Country:Luxembourg  

  • A cohomological obstruction to the existence of compact Clifford-Klein forms Invited International conference

    Rigidity School, Nagoya 2016  2016.7 

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    Language:English  

    Country:Other  

    A cohomological obstruction to the existence of compact Clifford-Klein forms

  • A cohomological obstruction to the existence of compact Clifford-Klein forms Invited

    2016.8 

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    Language:Japanese  

    Country:Other  

    A cohomological obstruction to the existence of compact Clifford-Klein forms

  • A cohomological obstruction to the existence of compact Clifford-Klein forms International conference

    Yosuke Morita

    Group Actions and Dynamics Seminar (Yale University)  2016.9 

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    Language:English  

    Country:United States  

  • A cohomological obstruction to the existence of compact Clifford-Klein forms Invited International conference

    Yosuke Morita

    International Conference for the 70th Anniversary of Korean Mathematical Society (session: Geometric Group Theory and Dynamics of Group Actions)  2016.10 

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    Language:English  

    Country:Korea, Republic of  

  • A cohomological obstruction to the existence of compact Clifford-Klein forms and ε-family of semisimple symmetric spaces

    森田 陽介

    2016年度表現論シンポジウム  2016.11 

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    Language:Japanese  

    Venue:オキナワ グランメールリゾート   Country:Other  

  • Homogeneous spaces that do not model any compact manifold Invited

    2017.4 

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    Language:Japanese  

    Country:Other  

    Homogeneous spaces that do not model any compact manifold

  • 等質空間のコンパクト Clifford-Klein 形の存在に対するコホモロジー的障害 Invited

    森田 陽介

    微分トポロジーセミナー(京都大学)  2017.5 

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    Language:Japanese  

    Venue:京都大学   Country:Other  

  • 等質空間の Clifford-Klein 形のコホモロジーについて Invited

    森田 陽介

    幾何学セミナー(名古屋大学)  2017.5 

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    Language:Japanese  

    Venue:名古屋大学   Country:Other  

  • 等質空間上の固有な作用 Invited

    森田 陽介

    談話会(京都大学)  2017.6 

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    Language:Japanese  

    Venue:京都大学数理解析研究所   Country:Other  

  • Real cohomology of compact homogeneous spaces (after Cartan-Chevalley-Koszul-Weil)

    2017.8 

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    Language:Japanese  

    Country:Other  

    Real cohomology of compact homogeneous spaces (after Cartan-Chevalley-Koszul-Weil)

  • A cohomological obstruction to the existence of compact Clifford-Klein forms Invited International conference

    Yosuke Morita

    The Third Japanese-Spanish Workshop on Differential Geometry  2017.9 

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    Language:English  

    Country:Spain  

  • 等質空間の Clifford-Klein 形のコホモロジーについて

    森田 陽介

    広島幾何学研究集会 2017  2017.10 

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    Language:Japanese  

    Venue:広島大学   Country:Other  

  • 簡約型等質空間のコンパクト商と不変式

    森田 陽介

    2017年度表現論シンポジウム  2017.11 

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    Language:Japanese  

    Venue:かんぽの宿 石和   Country:Other  

  • 等質空間の Clifford-Klein 形のコホモロジーについて Invited

    森田 陽介

    ワークショップ:幾何学的群論の新展開  2018.2 

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    Language:Japanese  

    Venue:ルネッサ赤沢   Country:Other  

  • Cohomological obstructions to the existence of compact Clifford-Klein forms Invited International conference

    2018.7 

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    Language:English  

    Country:Korea, Republic of  

    Cohomological obstructions to the existence of compact Clifford-Klein forms

  • 等質空間の Clifford-Klein 形の幾何学 Invited

    森田 陽介

    幾何学特別講義2/先端幾何学特別講義2(集中講義、全10回、10月8日-12日)  2018.10 

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    Language:Japanese  

    Venue:首都大学東京   Country:Other  

  • Cartan projections of abelian horospherical subgroups and proper actions on homogeneous spaces Invited

    2019.7 

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    Language:Japanese  

    Country:Other  

    Cartan projections of abelian horospherical subgroups and proper actions on homogeneous spaces

  • A generalization of the ping-pong lemma

    2019.8 

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    Country:Other  

    A generalization of the ping-pong lemma

  • Cartan projections of some nonreductive subgroups Invited International conference

    Yosuke Morita

    2020.1 

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    Language:English  

    Country:France  

  • コンパクト Clifford–Klein 形と球面束

    森田陽介

    2020.8 

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    Language:Japanese  

    Venue:玉原国際セミナーハウス(オンライン)   Country:Other  

  • 非簡約な部分群の Cartan 射影とコンパクト Clifford–Klein 形の存在問題 Invited

    森田陽介

    リー群論・表現論セミナー(東京大学)  2021.6 

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    Language:Japanese  

    Venue:東京大学(オンライン)   Country:Other  

  • 非簡約な閉部分群の Cartan 射影と等質空間のコンパクト商 Invited

    森田陽介

    リー群論、表現論およびその周辺分野  2021.8 

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    Language:Japanese  

    Venue:京都大学数理解析研究所(オンライン)   Country:Other  

  • Conley 指数について

    森田陽介

    2021.8 

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    Language:Japanese  

    Venue:玉原国際セミナーハウス(オンライン)   Country:Japan  

  • 指数対を使わない Conley 指数理論 Invited

    森田陽介

    京都力学系セミナー  2021.11 

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    Language:Japanese  

    Venue:京都大学(オンライン)   Country:Japan  

  • Conley 指数の定義について Invited

    森田陽介

    リー群論・表現論セミナー(東京大学)  2021.12 

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    Language:Japanese  

    Venue:東京大学(オンライン)   Country:Japan  

  • Morse theory on the loop spaces of Lie groups and manifolds with hyperpolar actions (after Bott, Bott-Samelson, Conlon)

    Workshop on "Actions of Reductive Groups and Global Analysis"  2022.8 

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    Language:Japanese  

    Country:Japan  

    Morse theory on the loop spaces of Lie groups and manifolds with hyperpolar actions (after Bott, Bott-Samelson, Conlon)

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Professional Memberships

  • THE MATHEMATICAL SOCIETY OF JAPAN

Academic Activities

  • Screening of academic papers

    Role(s): Peer review

    2023

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:0

    Number of peer-reviewed articles in Japanese journals:0

    Proceedings of International Conference Number of peer-reviewed papers:1

    Proceedings of domestic conference Number of peer-reviewed papers:0

  • 世話人 International contribution

    ( オンライン ) 2022.2

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    Type:Competition, symposium, etc. 

Research Projects

  • 等質空間のコンパクト商とファイブレーション

    Grant number:24K16922  2024 - 2027

    日本学術振興会  科学研究費助成事業  若手研究

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    Authorship:Principal investigator  Grant type:Scientific research funding

  • Clifford-Klein形とDolbeaultコホモロジー

    Grant number:19K14529  2019 - 2023

    日本学術振興会  科学研究費助成事業  若手研究

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    Authorship:Principal investigator  Grant type:Scientific research funding

  • 簡約型等質空間と非簡約型等質空間のコンパクトClifford-Klein形

    Grant number:17H06784  2017 - 2018

    日本学術振興会  科学研究費助成事業  研究活動スタート支援

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    Authorship:Principal investigator  Grant type:Scientific research funding

  • 簡約型等質空間と非簡約型等質空間のコンパクトClifford-Klein形

    2017

    京都大学若手研究者スタートアップ研究費

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    Authorship:Principal investigator  Grant type:On-campus funds, funds, etc.

  • 指数定理と余随伴軌道に関する研究

    2014 - 2016

    日本学術振興会  特別研究員

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    Authorship:Principal investigator  Grant type:Joint research

FD Participation

  • 2023.4   Role:Participation   Title:令和5年度 第1回全学FD(新任教員の研修)

    Organizer:University-wide

Media Coverage

  • 記事名:『京都大学ガロア祭/問題と解説』 Newspaper, magazine

    『数学セミナー』(日本評論社)2021年12月号  2021.11

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    記事名:『京都大学ガロア祭/問題と解説』