Updated on 2025/09/30

写真a

 
NAOE HIRONOBU
 
Organization
School of Science Assistant Professor
Title
Assistant Professor
External link

Degree

  • 博士(理学) ( 東北大学 )

  • 修士(理学) ( 東北大学 )

Research Interests

  • Topology

  • 4次元多様体

  • Turaev のシャドウ

  • Lefschetz fibration

Research Areas

  • Natural Science / Geometry  / Geometry

Education

  • Tohoku University   理学研究科

    2015.4 - 2018.3

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  • Tohoku University   理学研究科

    2013.4 - 2015.3

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  • Tohoku University   理学部   数学科

    2009.4 - 2013.3

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Research History

  • Tokyo Institute of Technology   School of Science   Assistant Professor

    2024.5

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  • Chuo University   Faculty of Science and Engineering Department of Mathematics

    2024.4

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  • Keio University   Faculty of Economics

    2023.10

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  • 中央大学理工学部助教

    2019.4 - 2024.3

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  • 東北大学大学院理学研究科数学専攻助教

    2018.4

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Professional Memberships

Papers

  • The special shadow-complexity of #k(S1 × S3) Reviewed

    Hironobu Naoe

    Journal of Knot Theory and Its Ramifications   34 ( 05 )   2025.3

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:World Scientific Pub Co Pte Ltd  

    The special shadow-complexity is an invariant of closed [Formula: see text]-manifolds defined by Costantino using Turaev’s shadows. We show that for any positive integer [Formula: see text], the special shadow-complexity of the connected sum of [Formula: see text] copies of [Formula: see text] is exactly [Formula: see text].

    DOI: 10.1142/s0218216525500142

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  • Some lower bounds for the Kirby-Thompson invariant Reviewed

    Nobutaka Asano, Hironobu Naoe, Masaki Ogawa

    Mathematical Research Letters   31 ( 6 )   1611 - 1637   2025

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:International Press of Boston  

    DOI: 10.4310/mrl.250210225353

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  • Shadows of 2–knots and complexity Reviewed

    Hironobu Naoe

    Algebraic & Geometric Topology   24 ( 8 )   4651 - 4695   2024.12

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Mathematical Sciences Publishers  

    DOI: 10.2140/agt.2024.24.4651

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  • Positive flow-spines and contact 3-manifolds, II Reviewed

    Ippei Ishii, Masaharu Ishikawa, Yuya Koda, Hironobu Naoe

    Annali di Matematica Pura ed Applicata (1923 -)   203 ( 3 )   1251 - 1266   2023.12

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    Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    DOI: 10.1007/s10231-023-01400-4

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    Other Link: https://link.springer.com/article/10.1007/s10231-023-01400-4/fulltext.html

  • Positive flow-spines and contact 3-manifolds Reviewed

    Ippei Ishii, Masaharu Ishikawa, Yuya Koda, Hironobu Naoe

    Annali di Matematica Pura ed Applicata (1923 -)   202 ( 5 )   2091 - 2126   2023.3

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    Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    DOI: 10.1007/s10231-023-01314-1

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    Other Link: https://link.springer.com/article/10.1007/s10231-023-01314-1/fulltext.html

  • Presentation of the fundamental groups of complements of shadows Reviewed

    Masaharu Ishikawa, Yuya Koda, Hironobu Naoe

    Essays in Geometry: Dedicated to Norbert A’Campo   557 - 588   2023

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    Language:English   Publishing type:Part of collection (book)  

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  • Four-manifolds with shadow-complexity one Reviewed

    Yuya Koda, Bruno Martelli, Hironobu Naoe

    Annales de la Faculté des sciences de Toulouse : Mathématiques, Serie 6   31 ( 4 )   1111 - 1212   2022

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

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  • Corks with large shadow-complexity and exotic 4-manifolds Reviewed

    Hironobu Naoe

    Experimental Mathematics   30 ( 2 )   157 - 171   2021

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

    DOI: 10.1080/10586458.2018.1514332

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  • Milnor fibration, A’Campo’s divide and Turaev’s shadow, Singularities Reviewed

    Masaharu Ishikawa, Hironobu Naoe

    Singularities ― Kagoshima 2017, Proceedings of the 5th Franco-Japanese-Vietnamese Symposium on Singularities   71 - 93   2020

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    Language:English   Publishing type:Research paper (international conference proceedings)  

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  • Shadows of acyclic 4-manifolds with sphere boundary Reviewed

    Yuya Koda, Hironobu Naoe

    Algebraic & Geometric Topology   20 ( 7 )   3707 - 3731   2020

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

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  • Mazur manifolds and corks with small shadow complexities Reviewed

    Hironobu Naoe

    Osaka Journal of Mathematics   55 ( 3 )   479 - 498   2018

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

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  • SHADOWS OF 4-MANIFOLDS WITH COMPLEXITY ZERO AND POLYHEDRAL COLLAPSING Reviewed

    Hironobu Naoe

    PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY   145 ( 10 )   4561 - 4572   2017.10

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

    DOI: 10.1090/proc/13595

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Presentations

  • 4次元多様体の組み合わせ的表示と不変量 Invited

    直江央寛

    大岡山談話会  2024.5 

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    Language:Japanese  

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  • 閉4次元多様体のシャドウと分類の手段

    直江央寛

    第1回トポロジー合宿セミナー  2025.3 

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    Language:Japanese  

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  • 4次元多様体の組み合わせ的表示と不変量 Invited

    直江央寛

    中央大学 幾何・トポロジー小研究集会  2024.7 

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    Language:Japanese  

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  • Turaev のシャドー

    トポロジー新人セミナー2014  2014.7 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:さんさ亭 (刈田郡蔵王町)  

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  • Shadows of acyclic 4-manifolds with sphere boundary

    北陸結び目セミナー2019  2019.10 

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    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 4次元ホモロジー球体の微分構造とシャドウ Invited

    大阪大学トポロジーセミナー  2019.10 

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

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  • Lefschetz fibrations of divides and shadows International conference

    Hironobu Naoe

    Hyper plane arrangements and Japanese Australian workshop on Real and Complex Singularities  2019.12 

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    Language:English   Presentation type:Poster presentation  

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  • Shadow による Mazur manifold の構成

    直江央寛

    東北大学 幾何セミナー  2014.11 

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

    Venue:東北大学 (仙台市)  

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  • Lefschetz fibrations of divides and shadows Invited

    直江央寛

    ひねる代数~Hurwitz actionとその周辺~  2020.1 

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    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Shadows of acyclic 4-manifolds with sphere boundary II

    直江央寛

    ハンドルセミナー  2019.7 

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

    Venue:東京大学 (東京)  

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  • Infinitely many corks with shadow complexity one Invited International conference

    Hironobu Naoe

    Topology and Geometry of Low-dimensional Manifolds  2015.10 

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    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:奈良女子大 (奈良市)  

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  • Turaev のシャドウとその複雑度 Invited

    直江央寛

    N-KOOKセミナー  2020.11 

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    Language:Japanese   Presentation type:Oral presentation (invited, special)  

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  • Infinitely many corks with special shadow complexity one

    東北大学 幾何セミナー  2015.11 

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

    Venue:東北大学 幾何セミナー  

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  • Infinitely many corks with special shadow complexity one

    直江央寛

    4次元トポロジー  2015.11 

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    Language:Japanese  

    Venue:大阪市立大学 (大阪市)  

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  • Infinitely many corks with special shadow complexity one

    直江央寛

    4次元トポロジー  2015.11 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:大阪市立大学 (大阪市)  

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  • シャドウによる無限個の Mazur 多様体および cork の構成

    直江央寛

    第 8 回 東北大学大学院理学研究科 6 専攻合同シンポジウム  2015.2 

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    Language:Japanese   Presentation type:Poster presentation  

    Venue:東北大学 (仙台市)  

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  • フロースパインと接触構造 Invited

    直江央寛

    接触構造、特異点、微分方程式及びその周辺  2020.1 

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    Language:Japanese   Presentation type:Oral presentation (invited, special)  

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  • Corks with shadow complexity one

    Hironobu Naoe

    Friday Seminar on Knot Theory  2015.7 

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

    Venue:大阪市立大学 (大阪市)  

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  • 4次元多様体のシャドウとレフシェッツファイバー空間 Invited

    直江央寛

    関東若手幾何セミナー  2020.2 

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    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:中央大学  

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  • Shadow から構成される cork と shadow complexity Invited

    直江央寛

    特異点と多様体の幾何学VI  2015.9 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:草津セミナーハウス (吾妻郡草津町)  

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  • Turaev's shadows and Lefschetz fibrations Invited

    直江央寛

    北海道大学 離散幾何構造セミナー  2020.10 

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    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Shadow complexity 1 をもつ無限個のコルクの族

    直江央寛

    東北結び目セミナー2015  2015.10 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:山形市保健センター (山形市)  

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  • Turaev's shadows and Lefschetz fibrations II Invited

    直江央寛

    北海道大学 離散幾何構造セミナー  2020.10 

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    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Infinitely many corks with special shadow complexity one

    直江央寛

    結び目の数学 VIII  2015.12 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:早稲田大学 (東京)  

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  • Shadows and complexities of 2-knots

    直江央寛

    拡大 KOOK セミナー 2022  2022.9 

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    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Shadows of 2-knots and complexity

    直江央寛

    北陸結び目セミナー 2022  2022.9 

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    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Infinitely many corks with special shadow complexity one Invited International conference

    Hironobu Naoe

    2016 East Asian Core Doctorial Forum on Mathematics  2016.1 

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    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:復旦大学 (中国)  

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  • Shadows of 2-knots and complexity

    直江央寛

    4次元トポロジー  2022.11 

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    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Infinitely many corks with special shadow complexity one International conference

    Hironobu Naoe

    The 11th East Asian School of Knots and Related Topics  2016.1 

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    Language:English   Presentation type:Oral presentation (general)  

    Venue:大阪市立大学 (大阪市)  

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  • Shadows of 2-knots and complexity Invited

    直江央寛

    広島大学 トポロジー・幾何セミナー  2022.11 

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    Language:Japanese  

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  • Positive flow-spines and contact 3-manifolds

    直江央寛

    日本数学会 2021 年度秋季総合分科会  2021.9 

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    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Presentation of the fundamental groups of complements of shadows

    直江央寛

    Branched Cover- ings, Degenerations, and Related Topics 2022  2022.3 

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    Language:Japanese   Presentation type:Oral presentation (invited, special)  

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  • On homology 4-balls with shadow complexity zero

    直江央寛

    4次元トポロジー  2016.11 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:大阪市立大学 (大阪市)  

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  • Acyclic 4-manifolds with shadow complexity zero and polyhedral collapsing

    Hironobu Naoe

    Mini-Workshop on 3- and 4-manifolds  2016.11 

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

    Venue:東北大学 (仙台市)  

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  • Homology 4-balls with complexity zero and collapsing of shadows

    直江央寛

    結び目の数学 IX  2016.12 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:日本大学 (東京)  

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  • The acyclic 4-manifolds with shadow complexity zero International conference

    Hironobu Naoe

    The 12th East Asian School of Knots and Related Topics  2017.2 

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    Language:English   Presentation type:Oral presentation (general)  

    Venue:東京大学 (東京)  

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  • Exotic な微分構造と shadow から構成するコルク

    第9回東北大学大学院理学研究科6専攻合同シンポジウム  2016.2 

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    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:東北大学 (仙台市)  

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  • Some lower bounds for the Kirby-Thompson invariant Invited

    直江央寛

    東工大トポロジーセミナー  2022.12 

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    Language:Japanese  

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  • Shadow から構成されるコルクと shadow complexity

    直江央寛

    Summer Workshop 2016 & Knotting Nagoya on Low-Dimensional Topology and its Ramifications  2016.6 

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    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:名城大学 (名古屋市)  

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  • Shadows of 4-manifolds and 2-knots Invited

    直江央寛

    対称性と幾何セミナー  2022.12 

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    Language:Japanese  

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  • Shadow complexity 0 の非輪状4次元多様体について Invited

    直江央寛

    ハンドルセミナー  2016.9 

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

    Venue:東京工業大学 (東京)  

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  • 4 次元多様体の影 Invited

    直江央寛

    トポロジー新人セミナー 2023  2023.8 

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    Presentation type:Oral presentation (invited, special)  

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  • Acyclic 4-manifolds with shadow complexity zero and polyhedral collapsing

    東北結び目セミナー2016  2016.10 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東北大学 (仙台市)  

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  • Shadow-complexity and trisection genus Invited

    Hironobu Naoe

    Topology of Singularities and Related Topics  2023.9 

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    Presentation type:Oral presentation (invited, special)  

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  • On corks with low shadow complexity International conference

    Hironobu Naoe

    Branched Coverings, Degenerations, and Related Topics 2017  2017.3 

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    Language:English   Presentation type:Poster presentation  

    Venue:東北学院大学 (多賀城市)  

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  • Shadow complexity が2以下のコルクについて

    直江央寛

    広島大学 トポロジー・幾何セミナー  2017.7 

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

    Venue:広島大学 (東広島市)  

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  • On corks with low shadow complexity

    直江央寛

    拡大KOOKセミナー2017  2017.8 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:大阪工業大学 (大阪市)  

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  • Shadow-complexity and trisection genus Invited

    Hironobu Naoe

    Seminari di geometria  2023.11 

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    Presentation type:Oral presentation (invited, special)  

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  • Shadow-complexity and trisection genus

    直江央寛

    結び目の数理 VI  2023.12 

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    Presentation type:Oral presentation (general)  

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  • Small and large shadow-complexities of corks and exotic 4-manifolds Invited

    直江央寛

    大阪大学4次元トポロジーセミナー  2017.12 

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

    Venue:大阪大学 (豊中市)  

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  • Large shadow-complexity of corks International conference

    Hironobu Naoe

    The 13th East Asian School of Knots and Related Topics  2018.1 

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    Language:English   Presentation type:Oral presentation (general)  

    Venue:KAIST (韓国)  

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  • Shadow-complexity of corks and exotic pairs of 4-manifolds Invited International conference

    Hironobu Naoe

    Branched Coverings, Degenerations, and Related Topics 2018  2018.3 

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    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:広島大学 (東広島市)  

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  • Corks and their shadow complexities

    直江央寛

    日本数学会2017年度秋季総合分科会  2017.9 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:山形大学 (山形市)  

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  • On corks having large shadow-complexity

    直江央寛

    東北結び目セミナー2017  2017.9 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:山形大学 (山形市)  

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  • On corks with low shadow-complexity Invited

    Hironobu Naoe

    Seminari di geometria  2017.10 

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

    Venue:ピサ大学 (イタリア)  

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  • Infinite family of corks having large shadow-complexity

    直江央寛

    4次元トポロジー  2017.11 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:大阪市立大学 (大阪市)  

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  • Infinitely many corks having large shadow-complexities

    直江

    日本数学会 2018 年度年会  2018.3 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京大学 (東京)  

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  • 閉4次元多様体のシャドウ複雑度 Invited

    直江央寛

    東北大学 談話会  2018.7 

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

    Venue:東北大学 (仙台市)  

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  • Lefschetz fibrations of divides and shadows Invited

    東京女子大学トポロジーセミナー  2018.7 

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

    Venue:東京女子大学 (東京)  

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  • Closed 4-manifolds with shadow-complexity one International conference

    Hironobu Naoe

    Four Dimensional Topology  2018.9 

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    Language:English   Presentation type:Oral presentation (general)  

    Venue:大阪市立大学 (大阪市)  

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  • 2-knots in shadows of 4-manifolds Invited International conference

    Hironobu Naoe

    Differential Topology 19  2019.3 

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    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:立命館大学 (東京)  

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  • Shadows of acyclic 4-manifolds with sphere boundary

    直江央寛

    ハンドルセミナー  2019.6 

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

    Venue:東京大学 (東京)  

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  • Lefschetz fibrations of divides and shadows International conference

    Hironobu Naoe

    The 6th Franco-Japanese-Vietnamese Symposium on Singularities  2018.9 

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    Language:English   Presentation type:Oral presentation (general)  

    Venue:Khanh Hoa 大学 (ベトナム)  

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  • Fibered links and Lefschetz fibrations of A’Campo’s divides via Turaev’s shadows

    直江央寛

    東北結び目セミナー 2018  2018.10 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:カレッジプラザ (秋田市)  

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  • Shadows and Milnor fibrations of divides

    直江央寛

    広島大学 トポロジー・幾何セミナー  2018.11 

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

    Venue:広島大学 (東広島市)  

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  • Shadows and Milnor fibrations of divides Invited

    直江央寛

    Kyoto Young Topologists Seminar  2018.12 

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

    Venue:京都大学 (京都市)  

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Awards

  • 東北大学 総長賞

    2018.3  

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  • 青葉理学振興会 振興会賞

    2018.2  

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  • 川井数理科学財団 修士論文川井賞

    2015.2  

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Research Projects

  • 力学的微分トポロジーによる葉層・接触・シンプレクティック構造の研究

    Grant number:23K20798  2021.4 - 2026.3

    日本学術振興会  科学研究費助成事業  基盤研究(B)

    三松 佳彦, 直江 央寛, 高倉 樹, 太田 啓史, 三好 重明, 粕谷 直彦

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    Grant amount:\10270000 ( Direct Cost: \7900000 、 Indirect Cost:\2370000 )

    余次元1横断的実解析的葉層に関して、平坦円周束に対する Mather-Thurston 写像の解析が進み、離散群の分類空間の間の写像として、左逆写像(すなわち、単射に対する射影)を許容することが厳密に証明され、BΓ の基本群(Haefliger 群)の構造の一部が理解された。また、Haefliger 群の2次のホモロジーを調べるために、曲面上の横断実解析的葉層のPoincare-Bendixon 理論を整備して、問題点を整理した。
    シンプレクティック構造の巻ってんからは、カスプ特異点の Milnor ファイバーに構成した Lefschetz fibration を Lagrangian fibration とすることにより、整アファイン構造を経て, 対応する Hirzebruch-井上曲面に定まる筈の b-symplectic 構造が復元できることが分かった。この計算により、一見多岐に分かれている本研究の幾つかのテーマが再び統括的に研究されるべきであることが再確認された。
    また、接触構造の観点からは一般化された Chern-Hamilton 予想(Reeb 流による計量の変形の L^2 積分をエネルギー汎関数とする変分問題の臨界点を求める)を完全に解決し、臨界点は測地型代数的Anosov流に付随するものであることが分かった。これも、やはり本研究の幾つかの研究対象の中心に Anosov 流があることを改めて認識させ、研究全体の進展を流すものとなっている。
    更に、接触幾何から Engel 構造の幾何へと展開するために、Cartan 幾何を枠組みとして取り入れるべきであるとの認識に至り、双接触構造(射影的Anosov流)と共にCartan幾何を応用するための基礎を固めた。

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  • 力学的微分トポロジーによる葉層・接触・シンプレクティック構造の研究

    Grant number:21H00985  2021.4 - 2026.3

    日本学術振興会  科学研究費助成事業  基盤研究(B)

    三松 佳彦, 直江 央寛, 高倉 樹, 太田 啓史, 三好 重明, 粕谷 直彦

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    Grant amount:\10270000 ( Direct Cost: \7900000 、 Indirect Cost:\2370000 )

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  • シャドウによる3次元・4次元多様体の幾何構造の研究

    Grant number:20K14316  2020.4 - 2024.3

    若手研究 

    直江央寛

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    Grant type:Competitive

    Grant amount:\4290000 ( Direct Cost: \3300000 、 Indirect Cost:\990000 )

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  • 4次元多様体のシャドウとファイバー構造に関する研究

    2018.8 - 2020.3

    研究活動スタート支援 

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    Grant type:Competitive

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  • Foliations, contact structures, and symplectic structures on 3,4, and 5 dimensional manifolds

    Grant number:17H02845  2017.4 - 2021.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    Mitsumatsu Yoshihiko

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    Grant amount:\9490000 ( Direct Cost: \7300000 、 Indirect Cost:\2190000 )

    Based on the construction of Lefschetz fibrations and the existence of Anosov systems, we explained the structures of certain closed symplectic 4-manifolds and the regular Poisson structures on the 5-sphere. It also yields that the foliation on the 5-sphere constructed by Lawson is understood as a foliated Lefschetz fibration over the Reeb foliation on the 3-sphere.

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  • シャドウによる4次元多様体のエキゾチック微分構造に関する研究

    2017.4 - 2018.3

    特別研究員奨励費 

    直江央寛

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    Authorship:Principal investigator  Grant type:Competitive

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Academic Activities

  • 「東京科学大学トポロジーセミナー」世話人

    Role(s): Planning, management, etc.

    直江央寛  2024.10

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  • 「第1回トポロジー合宿セミナー」世話人

    Role(s): Planning, management, etc.

    軽尾浩晃、直江央寛  2024.8 - 2025.3

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