Updated on 2025/03/30

写真a

 
FURUSHO, Hidekazu
 
Organization
Graduate School of Mathematics Division of Mathematics Social Mathematics Professor
Graduate School
Graduate School of Mathematics
Undergraduate School
School of Science Department of Mathematics
Title
Professor

Degree 1

  1. 博士(理学) ( 2003.9   京都大学 ) 

Research Interests 2

  1. Algebraic Geometry

  2. Number Theory

Committee Memberships 18

  1. 多元数理科学研究科   専攻主任  

    2024.4 - 2025.3   

  2. 有山委員   有山委員会  

    2024.4 - 2025.3   

  3. 将来計画委員会   将来計画委員  

    2024.4 - 2025.3   

  4. 将来構想委員   将来構想委員  

    2024.4 - 2025.3   

  5. 全学教育企画委員   全学教育企画委員  

    2023.4 - 2024.3   

  6. 教務委員会   教務委員  

    2022.4 - 2024.3   

  7. 教務委員会   教務委員  

    2020.4 - 2021.3   

  8. G30教育生活連絡会議委員   G30教育生活連絡会議委員  

    2020.4 - 2021.3   

  9. 日本数学コンクール実行委員会   日本数学コンクール実行委員  

    2019.4 - 2021.3   

  10. 広報・談話会委員会   広報・談話会委員  

    2019.4 - 2020.3   

  11. 図書委員会   図書委員  

    2018.4 - 2019.3   

  12. ホームカミングディ実行委員会   ホームカミングディ実行委員会  

    2018.4 - 2019.3   

  13. IR本部会議WGアソシエイトメンバー委員   IR本部会議WGアソシエイトメンバー委員  

    2018.4 - 2019.3   

  14. IR本部会議WGアソシエイトメンバー委員   IR本部会議WGアソシエイトメンバー委員  

    2017.4 - 2018.3   

  15. 広報談話会委員会   広報談話会委員  

    2015.4 - 2017.3   

  16. 一年生指導委員   一年生指導委員  

    2015.4 - 2016.3   

  17. 日本数学会中部支部評議員   日本数学会中部支部評議員  

    2015.4 - 2016.3   

  18. 広報談話会委員会   広報談話会委員  

    2014.4 - 2015.3   

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Awards 3

  1. 日本数学会代数学賞

    2014.3   日本数学会  

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    Country:Japan

  2. 井上研究奨励賞

    2006.2   井上財団  

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    Country:Japan

  3. 日本数学会建部賢弘奨励賞

    2004.9   日本数学会  

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    Country:Japan

 

Papers 32

  1. Notes on Kashiwara-Vergne and double shuffle Lie algebras Invited Reviewed

    Hidekazu Furusho and Nao Komiyama

    Low Dimensional Topology and Number Theory Fukuoka, Japan, March 15–18, 2022. In Memory of Professor Toshie Takata     2025.3

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    Authorship:Lead author, Last author, Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)  

    DOI: https://doi.org/10.1007/978-981-97-3778-9

  2. The stabilizer bitorsors of the module and algebra harmonic coproducts are equal

    Enriquez, B; Furusho, H

    ADVANCES IN MATHEMATICS   Vol. 463   2025.3

  3. The Betti side of the double shuffle theory. III. Bitorsor structures Reviewed

    Enriquez, B; Furusho, H

    SELECTA MATHEMATICA-NEW SERIES   Vol. 29 ( 2 )   2023.4

  4. The Betti side of the double shuffle theory. II. Double shuffle relations for associators Reviewed

    Enriquez, B; Furusho, H

    SELECTA MATHEMATICA-NEW SERIES   Vol. 29 ( 1 )   2023.2

  5. The l-adic hypergeometric function and associators

    Furusho, H

    TUNISIAN JOURNAL OF MATHEMATICS   Vol. 5 ( 1 ) page: 1 - 29   2023

  6. Kashiwara-Vergne and dihedral bigraded Lie algebras in mould theory Reviewed

    Hidekazu Furusho and Nao Komiyama

    Ann. Fac. Sci. Toulouse Math   Vol. XXXII ( 4 ) page: 655 - 725   2023

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

    DOI: 10.5802/afst.1749

  7. THE PENTAGON EQUATION AND THE CONFLUENCE RELATIONS Reviewed

    Furusho, H

    AMERICAN JOURNAL OF MATHEMATICS   Vol. 144 ( 4 ) page: 873 - 894   2022.8

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    Language:Japanese  

    DOI: 10.1353/ajm.2022.0018

    Web of Science

  8. On relations among multiple zeta values obtained in knot theory Invited Reviewed

    Hidekazu Furusho

    the Advanced Lectures in Mathematics (ALM) book series   Vol. 49   page: 73 - 89   2022

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

  9. Analytic continuation of multiple polylogarithms in positive characteristic Reviewed

    Furusho, H

    TUNISIAN JOURNAL OF MATHEMATICS   Vol. 4 ( 3 )   2022

  10. The Betti side of the double shuffle theory. I. The harmonic coproducts Reviewed

    Enriquez, B; Furusho, H

    SELECTA MATHEMATICA-NEW SERIES   Vol. 27 ( 5 )   2021.11

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  11. Galois action on knots II: proalgebraic string links and knots Invited Reviewed

    Hidekazu Furusho

    Periods in Quantum Field Theory and Arithmetic" Springer Proceedings in Mathematics & Statistics   Vol. 314   page: 541--591   2020.3

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  12. p-adic multiple L-functions and cyclotomic multiple harmonic values Reviewed

    Furusho Hidekazu, Jarossay David

    INTERNATIONAL JOURNAL OF NUMBER THEORY   Vol. 16 ( 2 ) page: 361 - 375   2020.3

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

    DOI: 10.1142/S1793042120500190

    Web of Science

  13. A Stabilizer Interpretation of Double Shuffle Lie Algebras Reviewed

    Enriquez Benjamin, Furusho Hidekazu

    INTERNATIONAL MATHEMATICS RESEARCH NOTICES   Vol. 2018 ( 22 ) page: 6870 - 6907   2018.11

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

    DOI: 10.1093/imrn/rnx084

    Web of Science

  14. On the coefficients of the Alekseev-Torossian associator Reviewed

    Furusho Hidekazu

    JOURNAL OF ALGEBRA   Vol. 506   page: 364 - 378   2018.7

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

    DOI: 10.1016/j.jalgebra.2018.03.023

    Web of Science

  15. DESINGULARIZATION OF COMPLEX MULTIPLE ZETA-FUNCTIONS Reviewed

    Furusho Hidekazu, Komori Yasushi, Matsumoto Kohji, Tsumura Hirofumi

    AMERICAN JOURNAL OF MATHEMATICS   Vol. 139 ( 1 ) page: 147 - 173   2017.2

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

    DOI: 10.1353/ajm.2017.0002

    Web of Science

  16. Fundamentals of p-adic multiple L-functions and evaluation of their special values Reviewed

    Furusho Hidekazu, Komori Yasushi, Matsumoto Kohji, Tsumura Hirofumi

    SELECTA MATHEMATICA-NEW SERIES   Vol. 23 ( 1 ) page: 39 - 100   2017.1

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

    DOI: 10.1007/s00029-016-0233-2

    Web of Science

  17. Galois action on knots I: Action of the absolute Galois group Reviewed

    Furusho Hidekazu

    QUANTUM TOPOLOGY   Vol. 8 ( 2 ) page: 295 - 360   2017

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

    DOI: 10.4171/QT/91

    Web of Science

  18. p-adic Eisenstein-Kronecker series for CM elliptic curves and the Kronecker limit formulas, Reviewed

    Hidekazu Furusho, Shinichi Kobayashi, Kenichi Bannai

    Nagoya Math Journal   Vol. 219   page: 269-302   2015

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

  19. Around associators Invited Reviewed

    Hidekazu Furusho

    Automorphic forms and Galois representations 2   ( 415 ) page: 105-117   2014

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

  20. Mixed Pentagon, octagon and Broadhurst duality equation Reviewed

    Benjamin Enriquez, Hidekazu Furusho

    Journal of Pure and Applied Algebra   Vol. 216 ( 4 ) page: 982-995   2012

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

  21. Geometric interpretation of double shuffle relation for multiple L-values Reviewed

    Hidekazu Furusho

    Galois-Teichm\"{u}ller theory and Arithmetic Geometry, Advanced Studies in Pure Math   Vol. 63   page: 163-187   2012

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

  22. Double shuffle relation for associators Reviewed

    Hidekazu Furusho

    Annals of Mathematics   Vol. 174 ( 1 ) page: 341-360   2011

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

  23. Pentagon and hexagon equations Reviewed

    Hidekazu Furusho

    Annals of Mathematics   Vol. 171 ( 1 ) page: 545-556   2010

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  24. p-adic multiple zeta values II -- tannakian interpretations Reviewed

    Hidekazu Furusho

    Amer.J.Math   Vol. 129 ( 4 ) page: 1105-1144   2007

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    We establish a tannakian formalism of $p$-adic multiple polylogarithms
    and $p$-adic multiple zeta values introduced in our previous paper
    via a comparison isomorphism between
    a de Rham fundamental torsor and a rigid fundamental torsor
    of the projective line minus three points
    and also discuss its Hodge and \'{e}tale analogues.
    As an application we give a way to erase log poles of
    $p$-adic multiple polylogarithms and introduce
    overconvergent $p$-adic multiple polylogarithms
    which might be $p$-adic multiple analogue of
    Zagier's single-valued complex polylogarithms.

  25. Algebraic cycles and motivic generic iterated integrals Reviewed

    Hidekazu Furusho, Amir Jafari

    Mathematical Research Letters   Vol. 14 ( 6 ) page: 923-942   2007

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

  26. Regularization and generalized double shuffle relations for p-adic multiple zeta values Reviewed

    Hidekazu Furusho, Amir Jafari

    Compositio Math   Vol. 143   page: 1089-1107   2007

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

  27. The double shuffle relations for p-adic multiple zeta values Invited Reviewed

    Hidekazu Furusho, Amnon Besser

    AMS Contemporary Math   Vol. 416   page: 9-29   2006

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

    We give a proof of double shuffle relations for $p$-adic multiple zeta values
    by developing higher dimensional version of tangential base points and
    discussing a relationship with two (and one) variable $p$-adic multiple
    polylogarithms.

  28. p-adic multiple zeta values -- a precis. p-adic mathmatical physics Invited Reviewed

    Hidekazu Furusho

    Amer.Inst.Phys   Vol. 826   page: 222-236   2006

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

    This is an expose of the theory of $p$-adic multiple zeta value
    developped by the author.
    This theory is almost parallel to the story of the complex case.
    $p$-adic multiple polylogarithm, which is a $p$-adic function,
    is constructed by Coleman's $p$-adic iterated integration theory.
    $p$-adic multiple zeta value is defined to be its special value at $1$.
    Many nice properties of $p$-adic multiple zeta value is shown.
    $p$-adic KZ equation is also introduced and the $p$-adic Drinfel'd associator
    is constructed from two fundamental solutions of the $p$-adic KZ equation.
    A relation of $p$-adic multiple zeta value with
    the $p$-adic Drinfel'd associator as well as
    its relation with the fundamental group of the projective line minus
    three points is established.

  29. Multiple zeta values and Grothendieck-Teichm\"{u}ller groups Invited Reviewed

    Hidekazu Furusho

    AMS Contemporary Math   Vol. 416   page: 49-82   2006

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

    We get a canonical embedding from the spectrum of the algebra
    of multiple zeta values modulo $\pi^2$ into the graded version of
    the Grothendieck-Teichm\"{u}ller group
    by using relations of the Drinfel'd associator.
    On the other hand, it is known that the
    rational pro-$l$ Galois image algebraic group
    is embedded into the Grothendieck-Teichm\"{u}ller
    pro-algebraic group for each prime $l$.
    Via these embeddings, we get two kinds of relationship
    between the spectrum of the algebra of multiple zeta values and
    the pro-$l$ Galois image algebraic group.

  30. p-adic multiple zeta values I -- p-adic multiple polylogarithms and the p-adic KZ equation Reviewed

    Hidekazu Furusho

    Inventiones Mathematicae   Vol. 155 ( 2 ) page: 253-286   2004

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

    Our main aim in this paper is to give a foundation of the theory of
    $p$-adic multiple zeta values.
    We introduce (one variable) $p$-adic multiple polylogarithms
    by Coleman's $p$-adic iterated integration theory.
    We define $p$-adic multiple zeta values to be special values of
    $p$-adic multiple polylogarithms.
    We consider the $p$-adic KZ equation and introduce the
    $p$-adic Drinfel'd associator
    by using certain two fundamental solutions of the $p$-adic KZ equation.
    We show that our $p$-adic multiple polylogarithms appear
    as coefficients of
    a certain fundamental solution of the $p$-adic KZ equation
    and our $p$-adic multiple zeta values appear
    as coefficients of the $p$-adic Drinfel'd associator.
    We show various properties of $p$-adic multiple zeta values,
    which are sometimes analogous to the complex case
    and are sometimes peculiar to the $p$-adic case,
    via the $p$-adic KZ equation.

  31. The multiple zeta value algebra and the stable derivation algebra Reviewed

    Hidekazu Furusho

    Publ. Res. Inst. Math. Sci.   Vol. 39 ( 4 ) page: 695-720   2003

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  32. Geometric and arithmetic subgroups of the Grothendieck-Teichm\"{u}ller group Reviewed

    Hidekazu Furusho

    Mathematical Research Letters   Vol. 10 ( 1 ) page: 97-108   2003

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Books 1

  1. 結び目とGrothendieck-Teichmüller群

    古庄英和, 小谷久寿,新甫洋史( Role: Joint author)

    九州大学マス・フォア・インダストリ研究所  2016.2 

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    Language:Japanese

Presentations 97

  1. Kontsevich’s eye, Lie graphs and associators Invited International conference

    Hidekazu Furusho

    Low dimensional topology and number theory XV  2025.3.27 

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    Event date: 2025.3

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

  2. p-adic hypergeometric function and p-adic multiple polylogarithms Invited International conference

    Hidekazu Furusho

    Seminaire Combinatoire et Theorie des Nombres ICJ  2024.12.17 

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    Event date: 2024.12

    Language:English   Presentation type:Oral presentation (general)  

    Venue:ICJ, Universite Lyon 1   Country:France  

  3. The Betti side of double shuffle relations Invited International coauthorship International conference

    Hidekazu Furusho

    Seminar on periods and motives  2024.10.25  Jin Cao (THU), Ma Luo (ECNU), Jie Zhou (THU)

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    Event date: 2024.10

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Yau Mathematical Center, Tsing Hua University, Beijin   Country:China  

  4. Betti counterpart of the double shuffle group Invited International coauthorship International conference

    Hidekazu Furusho

    NCTS Seminar on Number Theory  2024.8.8  Chieh-Yu Chang (NTHU)

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    Event date: 2024.8

    Language:English   Presentation type:Oral presentation (general)  

    Venue:National Tsing Hua University, Hsinchu   Country:Taiwan, Province of China  

  5. On relations among multiple zeta values obtained in knot theory Invited

    Hidekazu Furusho

    Workshop on multiple zeta values, L-functions and related fields  2024.6.8  Jiahao Cheng, Nanchang Hangkong University (程家豪, 南昌航空大学)Jiangtao Li, Central South University (李江涛, 中南大学)Ma Luo, East China Normal University (罗马, 华东师范大学)Zhonghua Li, Tongji University (李忠华, 同济大学)Weiping Wang, Zhejiang Sci-Tech University (王伟平, 浙江理工大学)Ce Xu, Anhui Normal University (徐策, 安徽师范大学)Jianqiang Zhao, The Bishop’s School (赵健强, 美国毕夏普学校)

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    Event date: 2024.6

    Language:English   Presentation type:Oral presentation (keynote)  

    Venue:Anhui Normal University Wuhu   Country:China  

  6. p-adic hypergeometric function and p-adic multiple polylogarithm Invited International conference

    Hidekazu Furusho

    Follow-Up Workshop: "Periods in Physics, Number Theory and Algebraic Geometry"  2024.4.25  Spencer Bloch (Chicago), Herbert Gangl (Durham), Vasily Golyshev (Trieste), Fernando Rodriguez Villegas (Trieste), Don Zagier (Bonn)

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    Event date: 2024.4

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Hausdorff Institute for Mathematics, Bonn,   Country:Germany  

  7. An introduction to KZ associator Invited International conference

    Hidekazu Furusho

    Grothendieck-Teichmuller Theory  2024.2.27  Pierre Lochak (CNRS and IMJ-PRG, Paris, France) and Devendra Tiwari (Bhaskaracharya Pratishthana, Pune, India)

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    Event date: 2024.2 - 2024.3

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Madhava Lecture Hall, ICTS Bengaluru   Country:India  

  8. On confluence relation Invited International conference

    Hidekazu Furusho

    Grothendieck-Teichmuller Theory  2024.2.29  Pierre Lochak (CNRS and IMJ-PRG, Paris, France) and Devendra Tiwari (Bhaskaracharya Pratishthana, Pune, India)

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    Event date: 2024.2 - 2024.3

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Madhava Lecture Hall, ICTS Bengaluru   Country:India  

  9. アソシエーターと mould 理論

    古庄英和

    代数的整数論とその周辺2023  2023.12.14  千田雅隆(東京電機大学),三枝洋一(東京大学),甲斐亘(東北大学)

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    Event date: 2023.12

    Language:Japanese   Presentation type:Oral presentation (general)  

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

  10. p-adic hypergeometric function related with p-adic multiple polylogarithms Invited

    Hidekazu Furusho

    2023.11.24 

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    Event date: 2023.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  11. p-adic multiple zeta values, p-adic multiple polylogarithms and p-adic multiple L-functions I, II, III Invited

    Hidekazu Furusho

    Mini-course lectures  2023.11 

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    Event date: 2023.11

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

    Venue:Beijing International Center for Mathematical Research,   Country:China  

  12. Associators in mould theory Invited

    Hidekazu Furusho

    Mapping class groups: pronilpotent and cohomological approaches  2023.9.21  Christine Vespa (University of Strasbourg), Gwenael Massuyeau (University of Burgundy), Hiroaki Nakamura (Osaka University, Japan), Nariya Kawazumi (University of Tokyo), Takuya Sakasai (University of Tokyo)

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    Event date: 2023.9

    Venue:Les Diablerets, Switzerland,   Country:Switzerland  

  13. 正標数多重ポリログの解析接続 Invited

    古庄英和

    第68回 代数学シンポジウム  2023.8.31  髙橋 篤史

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    Event date: 2023.8 - 2023.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋大学多元数理科学研究科   Country:Japan  

  14. p-adic hypergeometric function related with p-adic multiple polylogarithms Invited

    Hidekazu Furusho

    NCTS Number Theory Seminar  2023.5.4 

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    Event date: 2023.5

    Language:English   Presentation type:Oral presentation (general)  

    Venue:National Tsing Hua University   Country:Taiwan, Province of China  

  15. Associateurs et theorie des moules Invited International conference

    Hidekazu Furusho

    Seminnaire Quantique  2023.3.14 

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    Event date: 2023.3

    Language:French   Presentation type:Oral presentation (general)  

    Venue:Strasbourg University   Country:France  

  16. On l-adic and p-adic hypergeometric functions

    Hidekazu Furusho

    L-functions and Motives in Niseko 2022  2022.9.11  Masanori Asakura (Hokkaido University), Noriyuki Otsubo (Chiba University) , Seidai Yasuda (Hokkaido University)

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    Event date: 2022.9

    Venue:Hilton Niseko Village, Hokkaido Japan   Country:Japan  

  17. Mould理論とKashiwara-Vergne Lie代数 II Invited

    古庄英和

    リーマン面に関連する位相幾何学  2022.9.6  河澄響矢 (東大数理) 田所勇樹 (木更津高専) 久野雄介 (津田塾大学) 佐藤正寿 (東京電機大学)

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    Event date: 2022.9

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

    Venue:オンライン   Country:Japan  

  18. 調和余積の 2 種類の固定化部分群について Invited International coauthorship

    古庄英和

    多重ゼータ値の諸相  2022.5.20  田坂 浩二

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    Event date: 2022.5

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

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

  19. On two stabilizers related to harmonic coproducts Invited International coauthorship International conference

    Hidekazu Furusho

    Seminnaire Quantique  2022.4.27 

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    Event date: 2022.4

    Language:English   Presentation type:Oral presentation (general)  

    Country:France  

  20. Kashiwara-Vergne Lie algebra and Goncharov’s dihedral Lie algebra in mould theory Invited International conference

    Low dimensional topology and number theory XIII  2022.3.17 

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    Event date: 2022.3

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

    Country:Japan  

  21. Associators and an l-adic analogue of Gauss's hypergeometric function Invited International conference

    Hidekazu Furusho

    Johnson homomorphisms and related topics  2022.1.12  Nariya Kawazumi, Gwénaël Massuyeau, Hiroaki Nakamura, Takuya Sakasai, Christine Vespa.

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    Event date: 2022.1

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Zoomによるオンライン開催  

  22. ℓ-進超幾何関数 Invited

    古庄英和

    九大多重ゼータセミナー(拡大版)  2021.11.23  金子昌信

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    Event date: 2021.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:九州大学   Country:Japan  

  23. Artin-Schreier equation and Carlitz multiple polylogarithms Invited International conference

    Hidekazu Furusho

    Japan Europe Number Theory Exchange Seminar  2021.6.1  Henrik Bachmann, Nils Matthes

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    Event date: 2021.6

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Zoomによるオンライン開催  

  24. ダブルシャッフル群の Betti 対応物 (Benjamin Enriquez 氏 (University of Strasbourg) との共同研究) Invited International coauthorship

    早稲田大学整数論研究集会  2021.3.23  橋本 喜一朗 (早稲田大学),尾崎 学 (早稲田大学),成田 宏秋 (早稲田大学), 坂田 裕 (早稲田大学高等学院),青木 琢哉 (早稲田大学)

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    Event date: 2021.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:早稲田大学数理科学研究所(Zoom によるオンライン開催)   Country:Japan  

  25. Analytic continuation of Carlitz multiple polylogarithms Invited International conference

    Hidekazu Furusho

    NCTS Seminar on Number Theory  2020.12.11  Cheih-yu Chang

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    Event date: 2020.12

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

    Venue:NTHU, Online seminar   Country:Taiwan, Province of China  

  26. Four groups related to associators Invited

    Hidekazu Furusho

    2020.2.13 

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    Event date: 2020.2

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

  27. The associator relation and the confluence relations International conference

    Hidekazu Furusho

    Expansions, Lie Algebras, and Invariants,  2019.7.25  Anton Alekseev, Dror Bar-Natan, and Roland van der Veen

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    Event date: 2019.7

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

    Venue:The Centre de Recherches Mathématiques   Country:Canada  

  28. On a relation of Hirose and Sato Invited International conference

    Hidekazu Furusho

    Multiple zeta values and related topics  2019.6.11  Minoru Hirose (Kyushu University), Masataka Ono (Kyushu University) Tomokazu Onozuka (Kyushu University), Nobuo Sato (Kyushu University)

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    Event date: 2019.6

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

    Venue:Kyushu University   Country:Japan  

  29. Kontsevich's eye, Lie graphs and associators Invited International conference

    Hidekazu Furusho

    Workshop: Johnson homomorphisms and related topics 2019  2019.5.16  Shinobu Hikami, Nariya Kawazumi, Gwénaël Massuyeau, Hiroaki Nakamura, Takuya Sakasai, Christine Vespa

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    Event date: 2019.5

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

    Venue:Tokyo university   Country:Japan  

  30. 調和余積のBetti対応物とDeligne-寺杣プロジェクト Invited International coauthorship

    関西多重ゼータ研究会  2019.5.11  関西多重ゼータ研究会

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    Event date: 2019.5

    Language:Japanese  

    Venue:大阪体育大学   Country:Japan  

  31. On Relations among Multiple Zeta Values Obtained in Knot Theory Invited International conference

    Hidekazu Furusho

    NCTS Seminar on Number Theory  2019.4.10 

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    Event date: 2019.4

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

    Venue:National Tsing Hua University,   Country:Taiwan, Province of China  

  32. p-adic multiple L-functions and cyclotomic multiple harmonic values. Invited International conference

    Hidekazu Furusho

    Special Session on Arithmetic and Transcendence of Special Functions and Special Values 

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    Event date: 2019.3

    Language:English   Presentation type:Oral presentation (general)  

    Venue:University of Hawaii at Manoa, Honolulu, USA   Country:United States  

  33. Betti side of the double shuffle theory Invited

    Hidekazu Furusho

    Low dimensional topology and number theory XI 

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    Event date: 2019.3

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  34. Kontsevich's eye, Lie graphs and associators

    Hidekazu Furusho

    Arithmetic and Algebraic Geometry 2019 

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    Event date: 2019.1

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Tokyo University   Country:Japan  

  35. アイについて... Invited

    古庄 英和

    第26回整数論サマースクール 「多重ゼータ値」 

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    Event date: 2018.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:伊良湖シーパーク&スパ   Country:Japan  

  36. On the coefficients of the Alekseev Torossian associator Invited International conference

    Hidekazu Furusho

    International Workshop on Arithmetic Geometry and Quantum Field Theory 

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    Event date: 2018.8

    Language:English   Presentation type:Oral presentation (general)  

    Venue:KIAS, Seoul, South Korea   Country:Korea, Republic of  

  37. On a relation of Hirose and Sato Invited International conference

    Hidekazu Furusho

    Taiwan-Japan Joint Workshop on Multiple Zeta Values 

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    Event date: 2018.8

    Language:English   Presentation type:Oral presentation (general)  

    Venue:National Taiwan University   Country:Taiwan, Province of China  

  38. Associators and Kontsevich's eye (1) and (2) Invited

    Hidekazu Furusho

    Algebraic Lie Theory and Representation Theory (ALTReT) 2018 

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    Event date: 2018.5

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

    Country:Japan  

  39. A Betti counterpart of the harmonic coproduct (I) Invited International conference

    Hidekazu Furusho

    Poisson geometry of moduli spaces, associators and quantum field theory 

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    Event date: 2018.4 - 2018.6

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Simons Center for Geometry and Physics, Stony Brook, USA   Country:United States  

  40. A Betti counterpart of the harmonic coproduct (I) Invited International conference

    Hidekazu Furusho

    Periods and Regulators 

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    Event date: 2018.1

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Hausdorff Research Institute for Mathematics, Bonn   Country:France  

  41. p-adic multiple zeta values Invited

    Hidekazu Furusho

    Combinatoire et Theorie de Nombres 

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    Event date: 2017.12

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Institut Camille Jordan, Universite Claude Bernard Lyon 1,   Country:France  

  42. The stabilizer of the harmonic coproduct and Racinet's double shuffle group Invited

    Hidekazu Furusho

    Seminaire tournant de theorie des nombres 

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    Event date: 2017.5

    Language:English   Presentation type:Oral presentation (general)  

    Venue:l'Institut Fourier, Grenoble   Country:France  

  43. Kontsevich's eye and associators I and II Invited

    Hidekazu Furusho

    Geometry of Moduli Space of Low Dimensional Manifolds 

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    Event date: 2016.12

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  44. A stabilizer interpretation of the double shuffle Lie algebra Invited

    Hidekazu Furusho

    Workshop on Grothendieck-Teichmuller Theories 

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    Event date: 2016.7

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Tianjin, China   Country:China  

  45. Complex and p-adic multiple zeta functions International conference

    Hidekazu Furusho

    Low dimensional topology and number theory VIII, 

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    Event date: 2016.3

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

    Country:Japan  

  46. 結び目へのガロア作用

    代数的整数論とその周辺 

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    Event date: 2015.11 - 2015.12

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

    Country:Japan  

  47. p-adic multiple L-functions and p-adic multiple polylogarithms International conference

    Hidekazu Furusho

    Zeta Functions of Several Variables and Applications 

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    Event date: 2015.9

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

    Country:Japan  

  48. Desingularization of multiple zeta functions International conference

    Hidekazu Furusho

    GRT, MZVs and associators 

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    Event date: 2015.8

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

    Country:Switzerland  

  49. 結び目と多重ゼータ値

    関西多重ゼータ研究会 

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    Event date: 2015.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  50. p-adic multiple zeta values International conference

    Hidekazu Furusho

    Seminnaire Groupes de Lie et espaces de modules 

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    Event date: 2015.4

    Language:English   Presentation type:Oral presentation (general)  

    Country:Switzerland  

  51. Complex and p-adic multiple zeta functions International conference

    Hidekazu Furusho

    S\'{e}minnaire Quantique 

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    Event date: 2015.3

    Language:English   Presentation type:Oral presentation (general)  

    Country:France  

  52. p-adic multiple zeta values (I)-(IV) International conference

    Hidekazu Furusho

    2015 TIMS Winter School on Number Theory 

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    Event date: 2015.2

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

    Country:Taiwan, Province of China  

  53. p-adic multiple zeta values International conference

    Hidekazu Furusho

    PMI Number Theory Seminar 

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    Event date: 2015.1

    Language:English   Presentation type:Oral presentation (general)  

    Country:Korea, Republic of  

  54. アソシエーターにまつわるエトセトラ

    東北大学談話会 

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    Event date: 2014.11

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

    Country:Japan  

  55. Multiple zeta values and associators International conference

    Hidekazu Furusho

    Tresses et Arithmetique 

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    Event date: 2014.10

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

    Country:France  

  56. Four groups related to associators International conference

    Hidekazu Furusho

    Homotopical Algebra, Operads and Grothendieck-Teichmüller groups 

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    Event date: 2014.9

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

    Country:France  

  57. Galois action on knots International conference

    Hidekazu Furusho

    Intelligence of Low-dimensional Topology 

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    Event date: 2014.5

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

    Country:Japan  

  58. Various topics around associators

    Hidekazu Furusho

    2014 Mathematical Society of Japan, annual meeting, Award Lecture for 2014 Algebra Prize 

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    Event date: 2014.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  59. Four groups related to associators International conference

    Hidekazu Furusho

    Japanese Turkish Joint Geometry Meeting 

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    Event date: 2013.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Turkey  

  60. Four groups related to associators International conference

    Hidekazu Furusho

    General Mathematics Seminar 

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    Event date: 2013.10

    Language:English   Presentation type:Oral presentation (general)  

    Country:Luxembourg  

  61. Desingularization of complex multiple zeta-functions and fundamentals of p-adic multiple L-functions International conference

    Hidekazu Furusho

    Exploratory Workshop, New Approaches To Multiple Zeta Values 

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    Event date: 2013.9 - 2013.10

    Language:English   Presentation type:Oral presentation (general)  

    Country:Spain  

  62. Galois action on knots International conference

    Hidekazu Furusho

    Motivic Galois Groups 

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    Event date: 2013.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:Hungary  

  63. Desingularization of complex multiple zeta-functions and fundamentals of p-adic multiple L-functions International conference

    Hidekazu Furusho

    Seminar on Algebra, Geometry and Physics 

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    Event date: 2013.7

    Language:English   Presentation type:Oral presentation (general)  

    Country:Germany  

  64. Galois action on knots International conference

    Hidekazu Furusho

    MPI-Oberseminar 

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    Event date: 2013.6

    Language:English   Presentation type:Oral presentation (general)  

    Country:Germany  

  65. Galois action on knots International conference

    Hidekazu Furusho

    Higher Structures in Topology and Number Theory 

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    Event date: 2013.4

    Language:English   Presentation type:Oral presentation (general)  

    Country:United Kingdom  

  66. On multiple L-functions and their p-adic analogues International conference

    Hidekazu Furusho

    Grothendieck-Teichm\"{u}ller theory and Multiple Zeta Values 

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    Event date: 2013.4

    Language:English   Presentation type:Oral presentation (general)  

    Country:United Kingdom  

  67. p-adic multiple zeta values International conference

    Hidekazu Furusho

    Introductory Workshop of Grothendieck-Teichm\"{u}ller Groups, Deformation and Operads 

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    Event date: 2013.1

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

    Country:United Kingdom  

  68. Galois action on knots International conference

    Hidekazu Furusho

    Low-Dimensional Topology and Number Theory 

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    Event date: 2012.8 - 2012.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:Germany  

  69. Galois action on knots International conference

    Hidekazu Furusho

    Periods and Motives 

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    Event date: 2012.7

    Language:English   Presentation type:Oral presentation (general)  

    Country:Spain  

  70. p-adic multiple polylogarithms International conference

    Hidekazu Furusho

    Polylogarithmes en alg\`{e}bre et en topologie 

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    Event date: 2012.6

    Language:English   Presentation type:Oral presentation (general)  

    Country:France  

  71. On GT-actions International conference

    Hidekazu Furusho

    Colloque à l'occasion des 80 ans de Pierre Cartier 

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    Event date: 2012.6

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

    Country:France  

  72. Galois action on knots

    Hidekazu Furusho

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    Event date: 2012.4

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  73. On Galois action on knots International conference

    Hidekazu Furusho

    Low dimensional topology and number theory IV  

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    Event date: 2012.3

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  74. Around associators International conference

    Hidekazu Furusho

    Automorphic forms and Galois representations 

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    Event date: 2011.7

    Language:English   Presentation type:Oral presentation (general)  

    Country:United Kingdom  

  75. Double shuffle for associators International conference

    Hidekazu Furusho

    Mathematische Arbeitstagung 2011 

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    Event date: 2011.6 - 2011.7

    Language:English   Presentation type:Oral presentation (general)  

    Country:Germany  

  76. On Associators International conference

    Hidekazu Furusho

    The motivic fundamental group  

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    Event date: 2011.5

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

    Country:Netherlands  

  77. Geometric interpretation of double shuffle relations for multiple L-values

    Hidekazu Furusho

    Various Aspects of Multiple Zeta Values 

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    Event date: 2010.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  78. Motivic Hopf algebra and tree Hopf algebra (joint work with A. Jafari)

    Arithmetic Geometry Workshop 2010 

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    Event date: 2010.8

    Language:Japanese  

  79. Motivic Galois group, Grothendieck-Teichmuller group and double shuffle group

    Des associateurs de Drinfeld \`{a} ceux de Kashiwara-Vergne et lien avec les invariants de noeuds g\'{e}n\'{e}ralis\'{e}s 

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    Event date: 2010.5

    Language:English  

  80. The motivic Galois group, the Grothendieck–Teichm¨uller group and the double shuffle group International conference

    Motives and Homotopy Theory of Schemes 

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    Event date: 2010.5

    Language:English  

  81. The motivic Galois group, the Grothendieck–Teichm¨uller group and the double shuffle group

    Quantum Groups and Quantum Topology 

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    Event date: 2010.4

    Language:English  

  82. Pentagon and hexagon equations

    P-adic Special Functions & Arithmetic Geometry 

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    Event date: 2009.10

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

    Country:Japan  

  83. Motivic Galois group,Grothendieck-Teichm¨uller group and double shuffle group

    第54回代数学シンポジウム 

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    Event date: 2009.8

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

    Country:Japan  

  84. Double shuffle relation for associators International conference

    Anabelian Geometry 

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    Event date: 2009.8

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

  85. Grothendieck-Teichmuller group International conference

    Séminaire M.A.T. : autour des travaux d'A. Grothendieck 

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    Event date: 2009.1

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

  86. Pentagon and hexagon equations International conference

    Multiple Polylogarithms and Moduli Spaces Day 

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    Event date: 2007.11

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

  87. Pentagon and hexagon equations of GT International conference

    GTEM Workshop Arithmetic of Curves and Covers 

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    Event date: 2007.11

    Language:English  

  88. Pentagon and hexagon equations International conference

    Arithmetic Algebraic Geometry Conference 

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    Event date: 2007.10

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

  89. Double shuffle relations for p-adic multiple zeta values International conference

    Arithmetic Algebraic Geometry 

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    Event date: 2007.9

    Language:English   Presentation type:Oral presentation (general)  

  90. ポリログとフロベニウス

    夏の学校 「多重ゼータ値とモティーフ」 

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    Event date: 2007.7

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

    Country:Japan  

  91. p進多重ゼータ値

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    Event date: 2007.7

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

    Country:Japan  

  92. Pentagon and Hexagons

    Motives, related topics, applications 

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    Event date: 2007.3

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

    Country:Japan  

  93. p進多重ゼータ値

    名古屋大学多元数理科学研究科談話会 

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    Event date: 2007.2

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

    Country:Japan  

  94. p-adic analogue of multiple zeta values International conference

    UK-Japan Winter School, Number Theory, 

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    Event date: 2007.1

    Language:English  

  95. Survey of Drinfel'd's work on GT and its associated quantumn groups

    Arithmetic Galois Theory and Related Moduli Spaces, 

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    Event date: 2006.10

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

    Country:Japan  

  96. p-adic multiple zeta values International conference

    Motives and Periods 

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    Event date: 2006.6

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

  97. Algebraic cycles and motivic generic iterated integrals International conference

    Red Lodge Conference 

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    Event date: 2006.4

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

▼display all

Research Project for Joint Research, Competitive Funding, etc. 1

  1. ゼータ関数とモティーフの理論の多様性

    2015.9 - 2018.3

    大幸財団第25回自然科学系学術研究助成 

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    Grant type:Competitive

KAKENHI (Grants-in-Aid for Scientific Research) 16

  1. Multiple zeta values, multiple q-zeta values and multiple Eisenstein series.

    Grant number:24KF0150  2024.10 - 2026.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for JSPS Fellows

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    Authorship:Principal investigator 

    Grant amount:\1000000 ( Direct Cost: \1000000 )

  2. 多重ゼータ値の次世代的研究

    Grant number:24K21510  2024.6 - 2027.3

    科学研究費助成事業  挑戦的研究(萌芽)

    古庄 英和

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    Authorship:Principal investigator 

    Grant amount:\6110000 ( Direct Cost: \4700000 、 Indirect Cost:\1410000 )

    多重ゼータ値の研究は整数論のみならずさまざまな研究分野と繋がっていることが指摘されている。本研究では整数論以外の他分野との関わりとして、Ecalleによって80年代頃に提唱されたmould理論に注目し、mould理論を整備しながら多重ゼータ値のダブルシャッフル関係式の研究への応用を図る。また、整数論内部の研究として、今まで提出されている多重ゼータ値の種々の変種について背後に共通して存する幾何学的な側面を重視しながら多角的に研究を行い各研究の相関関係を強化していく。

  3. アソシエーターから広がる数学

    Grant number:24K00520  2024.4 - 2029.3

    科学研究費助成事業  基盤研究(B)

    古庄 英和, 久野 雄介, 安田 正大

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    Authorship:Principal investigator 

    Grant amount:\16380000 ( Direct Cost: \12600000 、 Indirect Cost:\3780000 )

    アソシエーターの概念は実に様々な研究領域と繋がっていることが認識されており、近年活発な研究が国際的に行われ出してきている。本研究では主にmould理論、多重ゼータ値のダブルシャッフル関係式の幾何学的側面の理論、Grothendieck-Teichmuller理論、柏原-Vergne予想の研究を通して、アソシエーターに関連する研究の裾野をさらに広げていき、背後に潜む様々な理論の繋がりを追求していく。

  4. 多重L値のダブルシャッフル関係式の幾何学

    Grant number:23KF0230  2023.11 - 2026.3

    科学研究費助成事業  特別研究員奨励費

    古庄 英和, YADDADEN KHALEF

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    Authorship:Principal investigator 

    Grant amount:\2000000 ( Direct Cost: \2000000 )

    本研究は、ラシネのダブルシャッフル群、ドリンフェルトのグロタンディーク・タイヒミューラー群のエンリケによる円分拡大版、調和余積の固定化部分群の3者の関係について幾何学的な背景を明らかにしながら、多重ゼータ値や多重L値の冪級数表示より誘導される調和余積の幾何学的由来を分担者のヤダデン氏が考案した接合積の技術を用いながらベッチサイドの研究も合わせて解明させていく。
    本特別研究員はフランスで今まで行ってきたRacinetの多重L値のダブルシャッフル群の幾何学的な側面の考察、及びFurusho-Enriquezによるダブルシャッフル理論のBetti側の研究を、日本に来てからも精力的に研究を推し進めている。本研究員はこれまでの研究状況について、名古屋大学にて2023年11月9日に開催された研究報告会と九州大学にて2024年2月15日 ~ 2月18日において開催された「第 17 回ゼータ若手研究集会において「Double shuffle torsor of cyclotomic MZVs and stabilizers of de Rham and Betti coproducts」というタイトルで研究発表を行っている。また、研究をさらに推進すべく2023年 12月 11日 ~ 15日に京都大学数理解析研究所で開催された「代数的整数論とその周辺」の集会、及び2024年 2月 26日 ~ 3月 1日にインドのBangaloreのICTS研究所で開催されたdiscussion meeting "Grothendieck-Teichmuller theory"に参加し参加者たちと研究討議を盛んに行った。
    今までフランスで行ってきた研究を続けている。国内の研究集会に参加し国内の研究者達と交流を深めることで日本で流行っている研究も少しずつ取り入れている。
    研究内容に幅を持たせていく。具体的にはRacinetのダブルシャッフルリー代数だけでなくGoncharovの二面的リー代数の研究との関わりについても研究対象に加えていく。

  5. 数論的対象の背後にある幾何学の発見・構築を通じたL関数・ガロア表現の研究

    Grant number:23K20782  2023.4 - 2026.3

    科学研究費助成事業  基盤研究(B)

    安田 正大, 古庄 英和, 山下 剛

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    Authorship:Coinvestigator(s) 

    (A) 幾何的な p 進表現のモジュライ空間を統制する幾何的の理論化.
    (B) モジュラーシンボルの拡張, 結合子関係式の考察と多重ゼータ値への応用.
    (C) 局所新形式の理論の構築
    (D) CM モチーフの特殊値に関する Beilinson 予想の確立.
    について, 幾何学的な新視点を導入し研究を行う. また(A) と技術的に関連のある研究テーマとして p 進数体の絶対ガロア群の外部自己同型など, 従来と異なる方向への応用についても研究を行う.
    本年度の研究代表者の主な研究実績は次の3つである:1.研究分担者の山下氏と共同で、p 進数のなす体を基礎体とする 2 次元クリスタリン表現の整格子を Wach 加群を用いて具体的に調べる共同研究の成果を精密に検討し、詳細を論文にまとめる作業を進めた。その結果、今まで得られていた結果を精密化することができ、特に tres ramifie と呼ばれる還元を持つ場合の構造を詳しく調べることができた。このことによって、2 次元クリスタリン局所変形環の構造が tres ramifie の場合にも詳しく調べることができると期待される。2.近藤智氏と共同で、非アルキメデス局所体上の中心斜体の既約許容表現についての局所新形式の理論を開拓した。特に、general と呼ばれる既約 smooth 表現のクラスについてはかなりまとまった結果をえることができ、成果を論文をまとめる作業を進めた。3.p 進体 Q_p の絶対ガロア群の外部自己同型のなす群を、Q_p の代数閉包上の有理数値関数で適当な条件のなす集合に埋め込むことに成功した。
    研究分担者の山下は、上記1.の共同研究に加え、次の2つの研究を行った。4.Heilbronn 仮想指標の理論を一般化した捻り Heilbronn 仮想指標の理論をつくった。5. 遠アーベル幾何学における p 進セクション予想についての研究を進めた。
    研究分担者の古庄は、KZ 結合子の視点から p 進超幾何関数の研究を行い、p 進長期化関数と p 進多重ポリログとの関係について調べた。
    所属機関における研究以外の業務の割合が増え、研究代表者が研究に使える時間が、当初の予定よりも少なくなってしまったことが主な理由である。そのため、局所体の絶対ガロア群の外部自己同型の構造、および Fermat モチーフの L 関数についての計算について、いくつかの詳しい計算結果および、研究を推進するための多くのアイディアを得たが、それらを実際に実行することができなかった。また分担者の古庄氏の協力を仰ぎながら braid Lie algebra についての研究をする予定であったがそれも叶わなかった。また、本年度は prismatic cohomology や condensed mathematics などの技術の習得に多くの時間を配分することにしたため、成果の発表をほとんど行うことができなかった。
    研究推進のためには、遠アーベル幾何や K3 曲面などについての専門的知識が有用になりそうであるため、今まで想定していなかったこれらの分野の専門家との交流を積極的におこない、効率よく研究を進められるようにする計画である。また、braid Lie algebra についての研究を遠アーベル幾何におけるアイディアを用いて行う予定である。
    本年度は研究代表者の論文発表が少なく、見かけ上業績が少なくなっているが、本年度中に掲載確定した論文がいくつかあり、来年度中に出版されることを見込んでいる。

  6. Why is the multiple zeta value so ubiquitous?

    Grant number:21H04430  2021.4 - 2026.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

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  7. 数論的対象の背後にある幾何学の発見・構築を通じたL関数・ガロア表現の研究

    Grant number:21H00969  2021.4 - 2023.3

    科学研究費助成事業  基盤研究(B)

    安田 正大, 古庄 英和, 山下 剛

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    (A) 法 p 還元の計算を一般の半安定表現に拡張し, 柔軟性の高い整係数 p 進Hodge 理論の構築を目指す. また保型形式の slope を調べる手法を開発し Taylor-Wiles 系の議論を展開する.
    (B) Harder-Raghuram の手法を用いて複シャッフル空間についての代表者による予想を証明する. さらに modular symbol の概念を拡張してモジュラ複体と対応する理論を構築する.
    (C) Hilbert modular 多様体と Kummer 多様体の間の代数的対応を探し出す. さらに Fermat 曲線と関係する場合に, Beilinson 予想の確立を試みる.
    研究代表者は 2022 年度に,(A) 幾何的な p 進表現のモジュライ空間を統制する幾何的の理論化,(B) CM モチーフの特殊値に関する Beilinson 予想の確立,(C) 局所新形式の理論の構築 (D) 局所体の外部自己同型の p 進表現への影響,についての研究を行った.(A) については, 分担者の山下とともに Wach 加群と超幾何多項式を用いたクリスタリン表現の法 p 還元の計算についての共著論文の作成を進めた.また西硲拓哉氏の協力を仰ぎ, prisimatic site や Breuil-Kisin 加群を用いたクリスタリン表現の還元の手法についての知見を深めた.また (A) と関連する研究として,小林真一氏,太田和惟氏と共同で,半円分Zp拡大の局所イプシロンの構成法について研究を行った.(B) については, Hilbert モジュラー曲面の被覆に関する研究に着手した.(C) については, 近藤智氏と共同で, p 進体上の一般線形群の generic とは限らない既約許容表現に対する essential vector について,および中心的斜体の乗法群の表現に関する局所新形式についての研究を行い,また跡部発氏,大井雅雄氏と共同で奇数次ユニタリ群上の局所新形式の研究を行った. (D) については,p進体の絶対ガロア群の外部自己同型に関する河相の結果をもとに従来のp進表現の理論を見直すプロジェクトに着手した.研究分担者の古庄は,p進超幾何関数の研究を始め, この関数のみたす関数等式を示した.研究分担者の山下は宇宙際 Teichmuller 理論の拡張を研究するとともに,捻り Heilbronn 仮想指標を導入し有限群論を用いて Artin L関数の零点について研究した.
    局所新形式の理論について,研究が非常に順調に進展している.その他の研究についても少しずつ成果が出始めているが,論文としてまとめるには至っていない.また,局所体の外部自己同型についての研究では,今後取り組むべき多くの興味深い問題やその解決についての構想が得られた.
    成果が生まれつつある局所新形式の理論,および今後の興味深い発展が期待できる局所体の絶対ガロア群の外部自己同型についての研究を重点的に行う,後者の研究のために,国内外の関連分野の専門家との交流を積極的に行う,また得られた成果を論文にまとめる作業にも十分な時間を確保できるようにする.

  8. 数論トポロジーと種々のモノドロミー不変量の新たな展開

    Grant number:20H00115  2020.4 - 2025.3

    科学研究費助成事業  基盤研究(A)

    中村 博昭, 角皆 宏, 河澄 響矢, 森下 昌紀, 星 明考, 伊吹山 知義, 古庄 英和, 高橋 浩樹, 小笠原 健

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    本研究では,ガロア・タイヒミュラー群の普遍モノドロミー表現,正則逆ガロア問題に関わるリフトと特殊化,モノドロミー不変量としての種々の数論的関数の醸成,の三つの柱に集約される新しい観点からの方法を導入し,数論トポロジーに対する有機的な構造解析を進める.理論的考察とともに計算機による実例計算とを総合して数論側とトポロジー側との類似性比較に関する詳細な理解を追求するとともに,両者を繋ぐバイパス構築の手がかりに関わる数学的構造の理解の深化を目指す.
    昨年度に引き続き,研究室の大学院生 R.S.TarmidiとのトロピカルEdwards曲線の2パラメータ族について研究を進め,トロピカル平滑性が成り立つ条件を明示的に与えた.この共同研究をH.Nakamura, R.S.Tarmidi"On a two-parameter family of tropical Edwards curves" としてまとめて投稿し,Kyushu Journal of Mathematicsから掲載決定の報せを受け取った.分担者の河澄響矢を含む国際共同企画の一環として Workshop "Mapping class groups: pronilpotent and cohomological approaches"をSwissMAP Research Station in Les Diableretsにおいて,2023年9月17--22日の期間に実施し,ジョンソン準同型のほか関係する数論とトポロジーの関係する最新理論について研究交流を促進した.とくに分担者の古庄英和は"Associators in mould theory"というタイトルで講演を行い,最新の研究成果について報告をした.また分担者の森下昌紀と協力して,九州大学において国際研究集会"Low dimensional topology and number theory XV"を年度末の2024年3月5~8日に実施し,最新の成果について情報交換を行った.
    研究代表者が共著者の一人である論文(Eiko KIN, Hiroaki NAKAMURA, Hiroyuki OGAWA: Lissajous 3-braids, Journal of the Mathematical Society of Japan, Vol. 75 No. 1 (2023), pp. 195--228)および分担者の伊吹山知義が共著者の一人である論文(Hiraku ATOBE, Masataka CHIDA, Tomoyoshi IBUKIYAMA, Hidenori KATSURADA, Takuya YAMAUCHI: Harder's conjecture I, Journal of the Mathematical Society of Japan, Vol. 75, No. 4 (2023), pp. 1339--1408)が,2024年の3月に大阪公立大学にて開催された日本数学会の年会において,JMSJ論文賞を受賞した.
    コロナ感染状況の終息期になり,対面によるディスカッションが少しずつ可能になったことより,当初から想定していた研究活動が行えるようになった.
    引き続き,分担者や研究協力者の方たちを中心とした協力関係を進め,研究課題を追求する.

  9. Mathematics arising from motivic Galois groups and multiple zeta values

    Grant number:18H01110  2018.4 - 2023.3

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

    FURUSHO HIDEKAZU

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    Authorship:Principal investigator 

    Grant amount:\12220000 ( Direct Cost: \9400000 、 Indirect Cost:\2820000 )

    To make clearer a relationship of the motivic Galois group  and multiple zweta values with various fields of mathematics, I conducted researches, particularly on associators, and obtained the following results:
    geometric interpretation of the harmonic coproduct of multiple zeta values, equality of two stabilizers related with harmonic coproducts, mould theoretical formulation of associators, mould theoretic interpretation of Kashiwara-Vergne Lie algebra and Goncharov's dihedral Lie algebra, construction of l-adic hyper geometric function, construction of p-adic hypergeometric function, analytic continuation of positive characteristic version of multiple polylogarithms, equivalence between associator relations and confluence relations.

  10. 多重ゼータ値と多重Eisenstein級数の代数的, 幾何的な研究

    Grant number:16F16021  2016.4 - 2018.3

    科学研究費助成事業  特別研究員奨励費

    古庄 英和, BACHMANN HENRIK

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    Grant amount:\2300000 ( Direct Cost: \2300000 )

    多重ゼータ値とはここ四半世紀で研究が盛んになった研究対象であり、多重Eisenstein級数とはGangl, Kaneko Zagier (2006)により導入された二重Eisenstein級数を一般化した級数のことである。Bachamann氏は外国人特別研究員として採用されていた1年間、国内のさまざまなセミナー、研究集会に足繁く出向き国内の若手の研究者たちと複数の共同研究を同時進行で行い、この多重ゼータ値と多重Eisenstein級数について精力的に研究を続けてきた。主だった業績として以下の4つが挙げられる:
    1).多重Eisenstein級数の微分に関する研究:多重Eisenstein級数は、depthが1,2,3の場合において多重Eisenstein級数に関連するある種のq級数が微分作用素で閉じていることを計算により示した。
    2).補間Schur多重ゼータ値の研究:多重ゼータ値や多重ゼータスター値を一般化した補間多重ゼータ値という多項式とYoung図形より構成されるSchur多重ゼータ値が知られている。これら二者をつなげる補間Schur多重ゼータ値という多項式を導入し基本的な性質を導いた。
    3).円分的有限多重ゼータ値の研究:円分的有限多重ゼータ値を導入して、これの基本的な代数的構造の基本的性質、特殊値、有限多重ゼータ値のq類似とのつながりについての結果を得た。
    4).Schur多重ゼータ値の和公式の類似の研究:多重ゼータ値や多重ゼータスター値と同様にSchur多重ゼータ値に対しても和公式の類似が成り立つことを示した。
    翌年度、交付申請を辞退するため、記入しない。
    翌年度、交付申請を辞退するため、記入しない。

  11. Motivic Galois group(Fostering Joint International Research)

    Grant number:15KK0159  2016 - 2019

    Fund for the Promotion of Joint International Research (Fostering Joint International Research)

    FURUSHO HIDEKAZU

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    Authorship:Principal investigator 

    Grant amount:\14300000 ( Direct Cost: \11000000 、 Indirect Cost:\3300000 )

    To make clearer a relationship of the motivic Galois group with various fields of mathematics, I conducted researches, particularly on multiple zeta values and associators, and obtained the following results:
    geometric interpretation of the harmonic coproduct of multiple zeta values and constructions of its Betti counterpart, a method to calculate coefficients of the Alekseev-Torossian associator, relationship of associator relations and relations among multiple zeta values obtained in knot theory, relations between p-adic multiple L-functions and cyclotomic multiple harmonic values.

  12. Adelic new methods on arithemetic geometry and their applications to p-adic Hodge theory and multiple L-functions

    Grant number:15H03610  2015.4 - 2020.3

    Yasuda Seidai

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    The research representative and Go Yamashita have constructed families of Wach modules of rank two and applied them to the study of crystalline deformation rings of dimension two. He and Satoshi Kondo have constructed lifts of the zeta elements in motivic cohomologies of Drinfeld modular varieties to their integral models satisfying norm relations, and have constructed a theory of topoi related to monoids. He and Yusuke Sugiyama have introduced a new notion of pseudo-tameness and, by using them, have proved that any algebraic curve over an algebraically closed field has a tame morphism to the projective line. He has introduced the derived double shuffle spaces and has applied them to show a double shuffle analogue of Broadhurst-Kreimer conjecture in depth four. He has found that a suitable quotient of a Hilber modular surface related to the L-function of a certain curve of genus is a Kummer surface.

  13. Research on number theoretic properties of zeta functions in several variables

    Grant number:15K04788  2015.4 - 2018.3

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

    TSUMURA Hirofumi, MATSUMOTO Kohji, KOMORI Yasushi, FURUSHO Hidekazu

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    The main aim in this research is to study what is called the zeta function which plays an important role in number theory and investigate their properties. In particular, we studied zeta functions in several variables mainly from the viewpoint of the analytic aspect. We studied the Witten zeta function in several variables which was defined based on Witten's work, and also the Arakawa-Kaneko zeta function defined by Tsuneo Arakawa and Masanobu Kaneko. Our main result is consider the number theoretic properties of these zeta functions,and consequently we obtained unknown properties of them and gave new results.

  14. Studies on arithmetic invariants arising from mutual interactions between Galois groups and fundamental groupoids

    Grant number:26287006  2014.4 - 2019.3

    Nakamura Hiroaki

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    We found various properties of arithmetic functions arising from Galois representations in arithmetic fundamental groupoids. We investigated behaviors of Galois-polylogarithmic functions and derived a formula that relates their normalized special values on p-adic inertia group with standard p-adic polylogarithmic values. Elaborating the composition law for the Eisenstein invariants of universal monodromy representation in affine elliptic curves, we established a new foundation toward subsequent studies in arithmetic Galois monodromy theory.

  15. A study on algebraic and analytic behavior of multiple zeta-functions and multiple automorphic L-functions

    Grant number:25287002  2013.4 - 2018.3

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

    Matsumoto Kohji, TSUMURA HIROFUMI, KANEKO MASANOBU, OHNO YASUO, SHOJI MAYUMI, FURUSHO HIDEKAZU, YAMASAKI YOSHINORI, UMEGAKI YUMIKO, NAKAMURA TAKASHI

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    The present research has dealt with various multiple series, such as multiple zeta-functions of Euler-Zagier type, a more general class of zeta-functions of root systems, and also the same type of series with Fourier coefficients of modular forms on the numerators. The main results obtained in the period of the present research are the structure theory and functional relations for zeta-functions of root systems, or more general multiple zeta-functions associated with Lie groups; evaluation of values of multiple series involving hyperbolic functions; numerical computations on the zeros multiple zeta-functions; the proof of two types of functional equations for double zeta-functions involving Fourier coefficients of modular forms on the numerator; the idea of desingularized multiple zeta-functions and the development of the theory of p-adic multiple zeta-functions.

  16. モチヴィックガロア群-数論幾何学を越えて-

    2012.4 - 2016.3

    科学研究費補助金  若手研究(A)

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Teaching Experience (On-campus) 10

  1. 線形代数学II

    2018

  2. 線形代数学I

    2018

  3. 線形代数学II

    2016

  4. 線形代数学I

    2016

  5. 代数学要論I

    2016

  6. 線形代数学II

    2015

  7. 線形代数学I

    2015

  8. 代数学要論I

    2015

  9. 数理科学展望III /数理科学展望I(英語)

    2012

  10. 代数学特論I

    2010

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Teaching Experience (Off-campus) 3

  1. 数学特別講義H

    2014.4 - 2015.3 Tohoku University)

  2. 数理科学特別講義VII

    2012.4 - 2013.3 Kyushu University)

  3. 数理科学特別講義Ⅷ

    2011.4 - 2012.3 The University of Tokyo)

 

Social Contribution 4

  1. 出前講義、豊田西高校

    Role(s):Lecturer

    2023.11

  2. 出前講義、向陽高校

    Role(s):Lecturer

    2020.11

  3. NHKカルチャー, 数学散策

    Role(s):Lecturer

    NHKカルチャー  NHKカルチャー, 数学散策  2019.2

  4. NHKカルチャー, 数学散策

    Role(s):Lecturer

    NHKカルチャー  NHKカルチャー, 数学散策  NHKカルチャー  2018.7

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    Audience: General