Updated on 2024/04/19

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 14

  1. 全学教育企画委員   全学教育企画委員  

    2023.4 - 2024.3   

  2. 教務委員会   教務委員  

    2022.4 - 2024.3   

  3. 教務委員会   教務委員  

    2020.4 - 2021.3   

  4. 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   

  5. 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   

  6. 広報・談話会委員会   広報・談話会委員  

    2019.4 - 2020.3   

  7. 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   

  8. 図書委員会   図書委員  

    2018.4 - 2019.3   

  9. 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   

  10. 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   

  11. 広報談話会委員会   広報談話会委員  

    2015.4 - 2017.3   

  12. 一年生指導委員   一年生指導委員  

    2015.4 - 2016.3   

  13. 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   

  14. 広報談話会委員会   広報談話会委員  

    2014.4 - 2015.3   

▼display all

Awards 3

  1. 日本数学会代数学賞

    2014.3   日本数学会  

     More details

    Country:Japan

  2. 井上研究奨励賞

    2006.2   井上財団  

     More details

    Country:Japan

  3. 日本数学会建部賢弘奨励賞

    2004.9   日本数学会  

     More details

    Country:Japan

 

Papers 30

  1. 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

  2. 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

  3. The l-adic hypergeometric function and associators

    Furusho, H

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

  4. 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

     More details

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

    DOI: 10.5802/afst.1749

  5. THE PENTAGON EQUATION AND THE CONFLUENCE RELATIONS Reviewed

    Furusho, H

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

     More details

    Language:Japanese  

    DOI: 10.1353/ajm.2022.0018

    Web of Science

  6. 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

     More details

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

  7. Analytic continuation of multiple polylogarithms in positive characteristic Reviewed

    Furusho, H

    TUNISIAN JOURNAL OF MATHEMATICS   Vol. 4 ( 3 )   2022

  8. 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

     More details

  9. 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

     More details

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

    DOI: 10.1142/S1793042120500190

    Web of Science

  10. 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

     More details

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

  11. 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

     More details

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

    DOI: 10.1093/imrn/rnx084

    Web of Science

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

    Furusho Hidekazu

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

     More details

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

    DOI: 10.1016/j.jalgebra.2018.03.023

    Web of Science

  13. 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

     More details

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

    DOI: 10.1353/ajm.2017.0002

    Web of Science

  14. 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

     More details

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

    DOI: 10.1007/s00029-016-0233-2

    Web of Science

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

    Furusho Hidekazu

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

     More details

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

    DOI: 10.4171/QT/91

    Web of Science

  16. 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

     More details

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

  17. Around associators Invited Reviewed

    Hidekazu Furusho

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

     More details

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

  18. 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

     More details

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

  19. 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

     More details

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

  20. Double shuffle relation for associators Reviewed

    Hidekazu Furusho

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

     More details

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

  21. Pentagon and hexagon equations Reviewed

    Hidekazu Furusho

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

     More details

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

  22. Algebraic cycles and motivic generic iterated integrals Reviewed

    Hidekazu Furusho, Amir Jafari

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

     More details

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

  23. 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

     More details

    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

     More details

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

    Hidekazu Furusho

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

     More details

    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.

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

    Hidekazu Furusho

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

     More details

    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.

  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

     More details

    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 I -- p-adic multiple polylogarithms and the p-adic KZ equation Reviewed

    Hidekazu Furusho

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

     More details

    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.

  29. 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

     More details

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

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

    Hidekazu Furusho

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

     More details

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

▼display all

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 

     More details

    Language:Japanese

Presentations 91

  1. 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)

     More details

    Event date: 2024.2 - 2024.3

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Madhava Lecture Hall, ICTS Bengaluru   Country:India  

  2. 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)

     More details

    Event date: 2024.2 - 2024.3

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Madhava Lecture Hall, ICTS Bengaluru   Country:India  

  3. 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)

     More details

    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  

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

    Hidekazu Furusho

    2023.11.24 

     More details

    Event date: 2023.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  5. 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 

     More details

    Event date: 2023.11

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

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

  6. 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)

     More details

    Event date: 2023.9

    Venue:Les Diablerets, Switzerland,   Country:Switzerland  

  7. 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

     More details

    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  

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

    Hidekazu Furusho

    NCTS Number Theory Seminar  2023.5.4 

     More details

    Event date: 2023.5

    Language:English   Presentation type:Oral presentation (general)  

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

  9. Associateurs et theorie des moules Invited International conference

    Hidekazu Furusho

    Seminnaire Quantique  2023.3.14 

     More details

    Event date: 2023.3

    Language:French   Presentation type:Oral presentation (general)  

    Venue:Strasbourg University   Country:France  

  10. 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)

     More details

    Event date: 2022.9

    Venue:Hilton Niseko Village, Hokkaido Japan   Country:Japan  

  11. 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)

     More details

    Event date: 2022.9

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

    Venue:オンライン   Country:Japan  

  12. 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

     More details

    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  

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

    Hidekazu Furusho

    Seminnaire Quantique  2022.4.27 

     More details

    Event date: 2022.4

    Language:English   Presentation type:Oral presentation (general)  

    Country:France  

  14. 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 

     More details

    Event date: 2022.3

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

    Country:Japan  

  15. 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.

     More details

    Event date: 2022.1

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Zoomによるオンライン開催  

  16. 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

     More details

    Event date: 2021.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:九州大学   Country:Japan  

  17. 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

     More details

    Event date: 2021.6

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Zoomによるオンライン開催  

  18. 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)

     More details

    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  

  19. Analytic continuation of Carlitz multiple polylogarithms Invited International conference

    Hidekazu Furusho

    NCTS Seminar on Number Theory  2020.12.11  Cheih-yu Chang

     More details

    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  

  20. Four groups related to associators Invited

    Hidekazu Furusho

    2020.2.13 

     More details

    Event date: 2020.2

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

  21. 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

     More details

    Event date: 2019.7

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

    Venue:The Centre de Recherches Mathématiques   Country:Canada  

  22. 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)

     More details

    Event date: 2019.6

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

    Venue:Kyushu University   Country:Japan  

  23. 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

     More details

    Event date: 2019.5

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

    Venue:Tokyo university   Country:Japan  

  24. 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

     More details

    Event date: 2019.5

    Language:Japanese  

    Venue:大阪体育大学   Country:Japan  

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

    Hidekazu Furusho

    NCTS Seminar on Number Theory  2019.4.10 

     More details

    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  

  26. 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 

     More details

    Event date: 2019.3

    Language:English   Presentation type:Oral presentation (general)  

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

  27. Betti side of the double shuffle theory Invited

    Hidekazu Furusho

    Low dimensional topology and number theory XI 

     More details

    Event date: 2019.3

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  28. Kontsevich's eye, Lie graphs and associators

    Hidekazu Furusho

    Arithmetic and Algebraic Geometry 2019 

     More details

    Event date: 2019.1

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Tokyo University   Country:Japan  

  29. 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」 

     More details

    Event date: 2018.9

    Language:Japanese   Presentation type:Oral presentation (general)  

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

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

    Hidekazu Furusho

    International Workshop on Arithmetic Geometry and Quantum Field Theory 

     More details

    Event date: 2018.8

    Language:English   Presentation type:Oral presentation (general)  

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

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

    Hidekazu Furusho

    Taiwan-Japan Joint Workshop on Multiple Zeta Values 

     More details

    Event date: 2018.8

    Language:English   Presentation type:Oral presentation (general)  

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

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

    Hidekazu Furusho

    Algebraic Lie Theory and Representation Theory (ALTReT) 2018 

     More details

    Event date: 2018.5

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

    Country:Japan  

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

    Hidekazu Furusho

    Poisson geometry of moduli spaces, associators and quantum field theory 

     More details

    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  

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

    Hidekazu Furusho

    Periods and Regulators 

     More details

    Event date: 2018.1

    Language:English   Presentation type:Oral presentation (general)  

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

  35. p-adic multiple zeta values Invited

    Hidekazu Furusho

    Combinatoire et Theorie de Nombres 

     More details

    Event date: 2017.12

    Language:English   Presentation type:Oral presentation (general)  

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

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

    Hidekazu Furusho

    Seminaire tournant de theorie des nombres 

     More details

    Event date: 2017.5

    Language:English   Presentation type:Oral presentation (general)  

    Venue:l'Institut Fourier, Grenoble   Country:France  

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

    Hidekazu Furusho

    Geometry of Moduli Space of Low Dimensional Manifolds 

     More details

    Event date: 2016.12

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

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

    Hidekazu Furusho

    Workshop on Grothendieck-Teichmuller Theories 

     More details

    Event date: 2016.7

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Tianjin, China   Country:China  

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

    Hidekazu Furusho

    Low dimensional topology and number theory VIII, 

     More details

    Event date: 2016.3

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

    Country:Japan  

  40. 結び目へのガロア作用

    代数的整数論とその周辺 

     More details

    Event date: 2015.11 - 2015.12

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

    Country:Japan  

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

    Hidekazu Furusho

    Zeta Functions of Several Variables and Applications 

     More details

    Event date: 2015.9

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

    Country:Japan  

  42. Desingularization of multiple zeta functions International conference

    Hidekazu Furusho

    GRT, MZVs and associators 

     More details

    Event date: 2015.8

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

    Country:Switzerland  

  43. 結び目と多重ゼータ値

    関西多重ゼータ研究会 

     More details

    Event date: 2015.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  44. p-adic multiple zeta values International conference

    Hidekazu Furusho

    Seminnaire Groupes de Lie et espaces de modules 

     More details

    Event date: 2015.4

    Language:English   Presentation type:Oral presentation (general)  

    Country:Switzerland  

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

    Hidekazu Furusho

    S\'{e}minnaire Quantique 

     More details

    Event date: 2015.3

    Language:English   Presentation type:Oral presentation (general)  

    Country:France  

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

    Hidekazu Furusho

    2015 TIMS Winter School on Number Theory 

     More details

    Event date: 2015.2

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

    Country:Taiwan, Province of China  

  47. p-adic multiple zeta values International conference

    Hidekazu Furusho

    PMI Number Theory Seminar 

     More details

    Event date: 2015.1

    Language:English   Presentation type:Oral presentation (general)  

    Country:Korea, Republic of  

  48. アソシエーターにまつわるエトセトラ

    東北大学談話会 

     More details

    Event date: 2014.11

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

    Country:Japan  

  49. Multiple zeta values and associators International conference

    Hidekazu Furusho

    Tresses et Arithmetique 

     More details

    Event date: 2014.10

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

    Country:France  

  50. Four groups related to associators International conference

    Hidekazu Furusho

    Homotopical Algebra, Operads and Grothendieck-Teichmüller groups 

     More details

    Event date: 2014.9

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

    Country:France  

  51. Galois action on knots International conference

    Hidekazu Furusho

    Intelligence of Low-dimensional Topology 

     More details

    Event date: 2014.5

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

    Country:Japan  

  52. Various topics around associators

    Hidekazu Furusho

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

     More details

    Event date: 2014.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  53. Four groups related to associators International conference

    Hidekazu Furusho

    Japanese Turkish Joint Geometry Meeting 

     More details

    Event date: 2013.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Turkey  

  54. Four groups related to associators International conference

    Hidekazu Furusho

    General Mathematics Seminar 

     More details

    Event date: 2013.10

    Language:English   Presentation type:Oral presentation (general)  

    Country:Luxembourg  

  55. 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 

     More details

    Event date: 2013.9 - 2013.10

    Language:English   Presentation type:Oral presentation (general)  

    Country:Spain  

  56. Galois action on knots International conference

    Hidekazu Furusho

    Motivic Galois Groups 

     More details

    Event date: 2013.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:Hungary  

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

    Hidekazu Furusho

    Seminar on Algebra, Geometry and Physics 

     More details

    Event date: 2013.7

    Language:English   Presentation type:Oral presentation (general)  

    Country:Germany  

  58. Galois action on knots International conference

    Hidekazu Furusho

    MPI-Oberseminar 

     More details

    Event date: 2013.6

    Language:English   Presentation type:Oral presentation (general)  

    Country:Germany  

  59. Galois action on knots International conference

    Hidekazu Furusho

    Higher Structures in Topology and Number Theory 

     More details

    Event date: 2013.4

    Language:English   Presentation type:Oral presentation (general)  

    Country:United Kingdom  

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

    Hidekazu Furusho

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

     More details

    Event date: 2013.4

    Language:English   Presentation type:Oral presentation (general)  

    Country:United Kingdom  

  61. p-adic multiple zeta values International conference

    Hidekazu Furusho

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

     More details

    Event date: 2013.1

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

    Country:United Kingdom  

  62. Galois action on knots International conference

    Hidekazu Furusho

    Low-Dimensional Topology and Number Theory 

     More details

    Event date: 2012.8 - 2012.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:Germany  

  63. Galois action on knots International conference

    Hidekazu Furusho

    Periods and Motives 

     More details

    Event date: 2012.7

    Language:English   Presentation type:Oral presentation (general)  

    Country:Spain  

  64. p-adic multiple polylogarithms International conference

    Hidekazu Furusho

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

     More details

    Event date: 2012.6

    Language:English   Presentation type:Oral presentation (general)  

    Country:France  

  65. On GT-actions International conference

    Hidekazu Furusho

    Colloque à l'occasion des 80 ans de Pierre Cartier 

     More details

    Event date: 2012.6

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

    Country:France  

  66. Galois action on knots

    Hidekazu Furusho

     More details

    Event date: 2012.4

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  67. On Galois action on knots International conference

    Hidekazu Furusho

    Low dimensional topology and number theory IV  

     More details

    Event date: 2012.3

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  68. Around associators International conference

    Hidekazu Furusho

    Automorphic forms and Galois representations 

     More details

    Event date: 2011.7

    Language:English   Presentation type:Oral presentation (general)  

    Country:United Kingdom  

  69. Double shuffle for associators International conference

    Hidekazu Furusho

    Mathematische Arbeitstagung 2011 

     More details

    Event date: 2011.6 - 2011.7

    Language:English   Presentation type:Oral presentation (general)  

    Country:Germany  

  70. On Associators International conference

    Hidekazu Furusho

    The motivic fundamental group  

     More details

    Event date: 2011.5

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

    Country:Netherlands  

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

    Hidekazu Furusho

    Various Aspects of Multiple Zeta Values 

     More details

    Event date: 2010.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

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

    Arithmetic Geometry Workshop 2010 

     More details

    Event date: 2010.8

    Language:Japanese  

  73. 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 

     More details

    Event date: 2010.5

    Language:English  

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

    Motives and Homotopy Theory of Schemes 

     More details

    Event date: 2010.5

    Language:English  

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

    Quantum Groups and Quantum Topology 

     More details

    Event date: 2010.4

    Language:English  

  76. Pentagon and hexagon equations

    P-adic Special Functions & Arithmetic Geometry 

     More details

    Event date: 2009.10

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

    Country:Japan  

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

    第54回代数学シンポジウム 

     More details

    Event date: 2009.8

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

    Country:Japan  

  78. Double shuffle relation for associators International conference

    Anabelian Geometry 

     More details

    Event date: 2009.8

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

  79. Grothendieck-Teichmuller group International conference

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

     More details

    Event date: 2009.1

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

  80. Pentagon and hexagon equations International conference

    Multiple Polylogarithms and Moduli Spaces Day 

     More details

    Event date: 2007.11

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

  81. Pentagon and hexagon equations of GT International conference

    GTEM Workshop Arithmetic of Curves and Covers 

     More details

    Event date: 2007.11

    Language:English  

  82. Pentagon and hexagon equations International conference

    Arithmetic Algebraic Geometry Conference 

     More details

    Event date: 2007.10

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

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

    Arithmetic Algebraic Geometry 

     More details

    Event date: 2007.9

    Language:English   Presentation type:Oral presentation (general)  

  84. 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」 

     More details

    Event date: 2007.7

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

    Country:Japan  

  85. p進多重ゼータ値

     More details

    Event date: 2007.7

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

    Country:Japan  

  86. Pentagon and Hexagons

    Motives, related topics, applications 

     More details

    Event date: 2007.3

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

    Country:Japan  

  87. 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 

     More details

    Event date: 2007.2

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

    Country:Japan  

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

    UK-Japan Winter School, Number Theory, 

     More details

    Event date: 2007.1

    Language:English  

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

    Arithmetic Galois Theory and Related Moduli Spaces, 

     More details

    Event date: 2006.10

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

    Country:Japan  

  90. p-adic multiple zeta values International conference

    Motives and Periods 

     More details

    Event date: 2006.6

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

  91. Algebraic cycles and motivic generic iterated integrals International conference

    Red Lodge Conference 

     More details

    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 

      More details

    Grant type:Competitive

KAKENHI (Grants-in-Aid for Scientific Research) 13

  1. 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

      More details

    Authorship:Principal investigator 

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

  2. 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

      More details

    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。

  3. 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)

      More details

    Authorship:Coinvestigator(s) 

  4. 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 - 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

      More details

    Authorship:Coinvestigator(s) 

    (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.

  5. 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

      More details

    Authorship:Coinvestigator(s) 

    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.
    前年度に得たエル進多重ポリログ関数に関するOi-Ueno型関数等式に加えて,エル進トリログ関数に関する Landen型関数等式についての結果を白石伝助と共著論文 "Landen's trilogarithm functional equation and l-adic Galois multiple polylogarithms"としてまとめた.また前年度に得られたマグナス型非可換多項式と半シャッフル多項式の双対性について投稿した論文 "Demi-shuffle duals of Magnus polynomials in a free associative algebra"の改訂作業を進める中で主要な補題の一つに別証明が得られたため,これを追加する形で改訂し,査読つき専門誌Algebraic Combinatorics誌から受理の報せを受け取った。レベル3のテータ関数を用いた楕円曲線の退化に対応するトロピカルサイクルに関する梶原-金子-野辺-津田の超離散化の理論を,レベル4で具体化するプロジェクトをR.S.Tarmidiとともに進めた.研究協力者の小川裕之氏と金英子氏との共著論文の続編として,初期位相を一般にしたリサジュー曲線上の3点運動について解析を進め,モジュラー曲面の普遍被覆のファレイ充填系の切断列を与える記号列に対する主要公式を導き,計算機を用いたシミュレーションによる検証を行った.研究分担者の河澄響矢に協力し,第14回日本数学会季期研究所 New Aspects of Teichmueller theoryの連続講義部門の企画(2022年7月19日~22日学習院大学、7月25日~29日東京大学)に協力した. 研究分担者の森下昌紀と協力しWorkshop "Low dimensional topology and number theory XIV" を九州大学において2023年3月27日~30日に対面形式で開催し,数論トポロジーと関連する諸理論の最新の成果について情報を得た.
    コロナ感染情況の中で対面での打合せが不十分な面があったが、遠隔ツールを用いた支援体制を整えたことにより、一定程度の補完が可能になった。
    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 .

  6. モチヴィックガロア群と多重ゼータ値から広がる数学ー整数論からの解放ー

    Grant number:18H01110  2018.4 - 2023.3

    科学研究費助成事業  基盤研究(B)

    古庄 英和, 田坂 浩二, 大野 泰生, 安田 正大

      More details

    Authorship:Principal investigator 

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

    新しい研究としてl-進超幾何関数なる超幾何関数のl-進エタール類似を導入して研究を始めた。この関数に対してGaussの超幾何定理のl-進類似及びEulerの変換公式の類似を証明した。 前年度から開始した正標数の多重ポリログの解析接続についての研究も続行した。Artin-Schreir方程式を使って正標数の多重ポリログ関数の定義域を全空間まで広げて解析接続することを示し、新しく導入したモノドロミー加群の概念を用いて論文を整備し改訂した。この論文はTunisian Journalより掲載が決まった。Associator関係式(associatorsの定義関係式)と合流関係式が同値になるという論文を査読者の意見に基づいて論文を改訂した。 査読に何年もかかったがようやく掲載Amer.J.Mathにて掲載されることになった。Komiyama氏との共著を大幅に書き直した。最初の版でmouldsで記述した議論はすべてbimouldsに一般化した。この論文ではKashiwara-Vergneリー代数をEcalleのmould理論を用いた再解釈を与え、これよりこれの二重次数版からGoncharvのdihedralリー代数への埋め込みを実現している。この論文はAnn.Fac.Sc.Toulouseより掲載が決まった。Enriquez氏と共同で行なっている多重ゼータ値のdouble shuffle関係式に関するRacinetの理論のBetti側の理論に関するシリーズ共著3本の最初の一編目はSelecta.Mathより掲載されることになった。この一連の研究が終わってから、調和余積から定まる2種類の固定化部分群が一致しさらにそれらがRacinetのダブルシャッフル群とも一致するという結果が得られたので新たな共著論文を執筆した。分担者の田坂氏は、純奇多重ゼータ値の次元関連する行列のランクに関するBrownの予想についての肯定的な結果を提示した。また大野氏は中筋氏との共同研究により、多重ゼータ値の双対公式および一般化双対公式をSchur多重ゼータ値へ拡張することに成功した。
    コロナ禍のために直接対面で研究討議する機会が減ったために全体的に研究速度が緩かったと思う。シリーズ論文「The Betti side of the double shuffle theory、 I ,II, III」が長大であったせいか査読に思いの外時間がかかり長く待たされた。待っている間にこのシリーズ論文の大規模改訂を数回行ったためにさらに査読を長引かせることになってしまったのも一因であろう。上述の通り、この研究の続きとして調和余積から定まる2種類の固定化部分群が一致しさらにそれらがRacinetのダブルシャッフル群とも一致するという結果が得られたので新たな共著論文「The stabilizer bitorsors of the module and algebra harmonic coproducts are equal」を執筆したが、この論文での議論と記号に合わせるために先のシリーズ論文を書き直さなかればならなくなったことがこの大規模改訂の要因である。
    コロナ禍が落ち着き次第、今まで不自由していた対面での研究交流を積極的に図っていく。新たな共著論文「The stabilizer bitorsors of the module and algebra harmonic coproducts are equal」で行っている議論が複雑すぎているため、議論を見通し良く整備して論文をより読みやすくする必要がある。
    私が論文「The $\ell$-adic hypergeometric function and associators」で導入したl-進超幾何関数が、超幾何関数の全うな類似と皆に納得してもらえるよう、超幾何関数たるべき性質をさらに探し出してい可なければならない。また有限超幾何関数やDworkのp進超幾何関数との関係は現時点では全く不明であり、この二つの関連を探ることは重要な課題である。
    多重ゼータ値の研究においてmould理論は今後重要性が高まるであろう。さまざまな研究者達が使えるように、正しい定式化を与えながら理論の整備を続けていく。

  7. 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

      More details

    Authorship:Principal investigator 

    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。

  8. 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

      More details

    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.

  9. 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

      More details

    Authorship:Coinvestigator(s) 

    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.

  10. 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

      More details

    Authorship:Collaborating Investigator(s) (not designated on Grant-in-Aid) 

    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.

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

    Grant number:26287006  2014.4 - 2019.3

    Nakamura Hiroaki

      More details

    Authorship:Coinvestigator(s) 

    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.

  12. 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

      More details

    Authorship:Collaborating Investigator(s) (not designated on Grant-in-Aid) 

    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.

  13. 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)

      More details

    Authorship:Principal investigator 

▼display all

 

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

▼display all

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 3

  1. 出前講義、向陽高校

    Role(s):Lecturer

    2020.11

  2. 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

  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  NHKカルチャー  2018.7

     More details

    Audience: General