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Geometric structure and combinatorial structure of 3-dimensional manifolds

Research Project

Project/Area Number 22340013
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Geometry
Research InstitutionHiroshima University

Principal Investigator

SAKUMA MAKOTO  広島大学, 理学(系)研究科(研究院), 教授 (30178602)

Co-Investigator(Kenkyū-buntansha) SHIMADA Ichiro  広島大学, 大学院理学研究科, 教授 (10235616)
DOI Hideo  広島大学, 大学院理学研究科, 講師 (72542810)
YASUI Koichi  広島大学, 大学院理学研究科, 助教 (70547009)
HIRANOUCHI Toshiro  広島大学, 大学院理学研究科, 助教 (59321203)
KAMADA Seiichi  大阪市立大学, 大学院理学研究科, 教授 (60254380)
KONO Masaharu  北見工業大学, 工学部, 教授 (40170203)
NIKKUNI Ryo  東京女子大学, 現代教養部, 准教授 (00401878)
土井 英雄  広島大学, 理学(系)研究科(研究院), 講師 (50197993)
平之内 俊郎  広島大学, 理学(系)研究科(研究院), 助教 (30532551)
Co-Investigator(Renkei-kenkyūsha) AKIYOSHI Hirotaka  大阪市立大学, 大学院, 准教授 (80397611)
HIRASAWA Mikami  名古屋工業大学, 工学研究科, 准教授 (00337908)
OHSHIKA Ken'ICHI  大阪大学, 大学院理学研究科, 教授 (70183225)
WADA Masaaki  大阪大学, 大学院理学研究科, 教授 (80192821)
MIYACHI Hideki  大阪大学, 大学院理学研究科, 教授 (40385480)
KIN Eiko  大阪大学, 大学院理学研究科, 准教授 (80378554)
KOBAYASHI Tsuyoshi  奈良女子大学, 理学部, 教授 (00186751)
YAMASHITA Yasushi  奈良女子大学, 理学部, 教授 (70239987)
MORIMOTO Kanji  甲南大学, 理学部, 教授 (90200443)
NAKANISHI Toshihiro  島根大学, 総合理工学部, 教授 (00172354)
KOMORI Yohei  大阪市立大学, 大学院理学研究科, 准教授 (70264794)
SUGAWA Toshiyuki  東北大学, 情報科学研究科, 教授 (30235858)
SHACKLETON Kenneth  東京大学, 数物連携宇宙研究機構, 特任研究員 (70536870)
Project Period (FY) 2010-04-01 – 2015-03-31
Project Status Completed (Fiscal Year 2014)
Budget Amount *help
¥16,250,000 (Direct Cost: ¥12,500,000、Indirect Cost: ¥3,750,000)
Fiscal Year 2014: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2013: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2012: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2011: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2010: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Keywords2-bridge knot / 2-bridge link / bridge decomposition / Heegaard splitting / McShane's identity / cusp shape / 写像類群 / 2橋結び目 / モノドロミー群 / Heckoid group / Heegaard decomposition / Heckoid orbifold / 2橋結び目 / small cancellation theory / McShaneの等式 / free period / 2橋球面 / 解消トンネル / 楕円的モンテシノス絡み目
Outline of Final Research Achievements

(1) Joint work with Donghi Lee: We established a variation of McShane’s identity for 2-bridge links. Moreover, we introduced the Heckoid orbifolds and proved that they are hyperbolic, and gave a systematic construction of epimorphisms from 2-bridge link groups onto Heckoid groups. Furthermore, we proved that these are the only upper-meridian pair preserving epimorphisms onto even Heckoid groups.
(2) Joint work with Ken’ichi Ohshika: We proved that for a Heegarrd surface S of a 3-manifold M with high Hempel distance, a certain natural mapping class group associated with S has a natural free decomposition. We also proved that if S is of bounded combinatorics then there is a nonempty open set U of the projective measured lamination space of S, such that any simple loop in U is not null-homntopic in M and that any two distinct simple loops in U are not homotopic in M.

Report

(6 results)
  • 2014 Annual Research Report   Final Research Report ( PDF )
  • 2013 Annual Research Report
  • 2012 Annual Research Report
  • 2011 Annual Research Report
  • 2010 Annual Research Report
  • Research Products

    (33 results)

All 2015 2014 2013 2012 2011 2010

All Journal Article (15 results) (of which Peer Reviewed: 15 results,  Acknowledgement Compliant: 4 results) Presentation (18 results) (of which Invited: 12 results)

  • [Journal Article] Homotopically equivalent simple loops on 2-bridge spheres in 2-bridge link complements (I)2014

    • Author(s)
      Donghi Lee and Makoto Sakuma
    • Journal Title

      Geom. Dedicata

      Volume: 171 Issue: 1 Pages: 1-28

    • DOI

      10.1007/s10711-013-9891-9

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Homotopically equivalent simple loops on 2-bridge spheres in 2-bridge link complements (II)2014

    • Author(s)
      Donghi Lee and Makoto Sakuma
    • Journal Title

      Geom. Dedicata

      Volume: 171 Issue: 1 Pages: 29-56

    • DOI

      10.1007/s10711-013-9888-4

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Homotopically equivalent simple loops on 2-bridge spheres in 2-bridge link complements (III)2014

    • Author(s)
      Donghi Lee and Makoto Sakuma
    • Journal Title

      Geom. Dedicata

      Volume: 171 Issue: 1 Pages: 57-91

    • DOI

      10.1007/s10711-013-9889-3

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] A variation of McShane’s identity for 2-bridge links and its possible generalization2014

    • Author(s)
      Hirotaka Akiyoshi, Donghi Lee and Makoto Sakuma
    • Journal Title

      RIMS Kokyuroku Bessatsu

      Volume: B48 Pages: 131-147

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Epimorphisms from 2-bridge link groups onto Heckoid groups (I)2013

    • Author(s)
      Donghi Lee and Makoto Sakuma
    • Journal Title

      Hiroshima Mathematical Journal of Mathematics

      Volume: 43 Pages: 239-264

    • Related Report
      2013 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Epimorphisms from 2-bridge link groups onto Heckoid groups (II)2013

    • Author(s)
      Donghi Lee and Makoto Sakuma
    • Journal Title

      Hiroshima Mathematical Journal of Mathematics

      Volume: 43 Pages: 265-284

    • Related Report
      2013 Annual Research Report
    • Peer Reviewed
  • [Journal Article] A variation of McShane's identity for 2-bridge links2013

    • Author(s)
      Donghi Lee and Makoto Sakuma
    • Journal Title

      Geometry and Topology

      Volume: 17 Issue: 4 Pages: 2061-2101

    • DOI

      10.2140/gt.2013.17.2061

    • Related Report
      2013 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Epimorphisms from 2-bridge link groups onto Heckoid orbifolds (I)2013

    • Author(s)
      Donghi Lee, Makoto Sakuma
    • Journal Title

      Hiroshima Journal of Mathematics

      Volume: (出版受理)

    • Related Report
      2011 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Epimorphisms from 2-bridge link groups onto Heckoid orbifolds (II)2013

    • Author(s)
      Donghi Lee, Makoto Sakuma
    • Journal Title

      Hiroshima Journal of Mathematics

      Volume: (出版受理)

    • Related Report
      2011 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Epimorphisms between 2-bridge links : Homotopically trivial simple loops on 2-bridge spheres2012

    • Author(s)
      Donghi Lee, Makoto Sakuma
    • Journal Title

      Proc. London Math. Soc.

      Volume: Vol.104 Issue: 2 Pages: 359-386

    • DOI

      10.1112/plms/pdr036

    • Related Report
      2012 Annual Research Report 2011 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Simple loops on 2-bridge spheres in Heckoid orbifolds for 2-bridge link complements2012

    • Author(s)
      Donghi Lee, Makoto Sakuma
    • Journal Title

      Electron. Res. Announc. Math. Sci.

      Volume: 19 Issue: 0 Pages: 97-111

    • DOI

      10.3934/era.2012.19.97

    • Related Report
      2012 Annual Research Report 2011 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Simple loops on 2-bridge spheres in 2-bridge link complements, Electron2011

    • Author(s)
      Donghi Lee, Makoto Sakuma
    • Journal Title

      Res. Announc. Math. Sci

      Volume: 18 Issue: 0 Pages: 97-111

    • DOI

      10.3934/era.2011.18.97

    • Related Report
      2011 Annual Research Report
    • Peer Reviewed
  • [Journal Article] On hyperbolic once-punctured torus bundles III : Comparing two tessellations of the complex plane2010

    • Author(s)
      Warren Dicks, Makoto Sakuma
    • Journal Title

      Topology and its applications

      Volume: 157 Pages: 1873-1899

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Quandles derived from dynamical systems and subsets which are closed under quandle operations2010

    • Author(s)
      Seiichi Kamada
    • Journal Title

      Topology and its applications

      Volume: 157 Pages: 298-301

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Generalized Zariski-van Kampen theorem and its application to Grassmannian dual varieties2010

    • Author(s)
      Ichiro, Shimada
    • Journal Title

      International Journal of Mathematics

      Volume: 21 Pages: 591-637

    • NAID

      120002598782

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Presentation] Mapping class group action on the space of geodesic rays of a punctured hyperbolic surface2015

    • Author(s)
      Makoto Sakuma
    • Organizer
      Low dimensional topology and number theory VI
    • Place of Presentation
      九州大学
    • Year and Date
      2015-03-25 – 2015-03-28
    • Related Report
      2014 Annual Research Report
    • Invited
  • [Presentation] Mapping class group action on the space of geodesic rays of a punctured hyperbolic surface2015

    • Author(s)
      Makoto Sakuma
    • Organizer
      Branched coverings, degenerations, and related topics 2015
    • Place of Presentation
      東北学院大学
    • Year and Date
      2015-02-22 – 2015-02-24
    • Related Report
      2014 Annual Research Report
    • Invited
  • [Presentation] Mapping class group action on the space of geodesic rays of a punctured hyperbolic surface2014

    • Author(s)
      Makoto Sakuma
    • Organizer
      Topology and Geometry of Low-dimensional Manifolds
    • Place of Presentation
      奈良学セミナーハウス
    • Year and Date
      2014-10-27 – 2014-10-30
    • Related Report
      2014 Annual Research Report
    • Invited
  • [Presentation] Mapping class group action on the space of geodesic rays of a punctured hyperbolic surface2014

    • Author(s)
      Makoto Sakuma
    • Organizer
      リーマン面に関連する位相幾何学
    • Place of Presentation
      東京大学
    • Year and Date
      2014-08-24 – 2014-08-28
    • Related Report
      2014 Annual Research Report
    • Invited
  • [Presentation] 8の字結び目補空間の双曲構造2013

    • Author(s)
      作間 誠
    • Organizer
      Encounter with Mathematics
    • Place of Presentation
      中央大学
    • Related Report
      2013 Annual Research Report
    • Invited
  • [Presentation] Simple loops on bridge spheres and Heegaard surfaces2013

    • Author(s)
      作間 誠
    • Organizer
      酒井健様お祝いの会
    • Place of Presentation
      武蔵野美術大学新宿サテライト教室
    • Related Report
      2013 Annual Research Report
  • [Presentation] Simple loops on bridge spheres and Heegaard surfaces2013

    • Author(s)
      Makoto Sakuma
    • Organizer
      Geometry Days 2013
    • Place of Presentation
      Sobolev Institute of Mathematics, Nobosivirsk, ロシア
    • Related Report
      2013 Annual Research Report
    • Invited
  • [Presentation] The space of Kleinian groups generated by two parabolic transformations2013

    • Author(s)
      Makoto Sakuma
    • Organizer
      Knots Indea
    • Place of Presentation
      Indian Institute of Science Education and Research (IISER) Mohali, インド
    • Related Report
      2013 Annual Research Report
    • Invited
  • [Presentation] Simple loops on bridge spheres and Heegaard surfaces2013

    • Author(s)
      作間 誠
    • Organizer
      日本数学会2013年度年会 トポロジー分科会特別講演
    • Place of Presentation
      京都大学
    • Related Report
      2012 Annual Research Report
    • Invited
  • [Presentation] Epimorphisms from 2-bridge links onto Heckoid groups2012

    • Author(s)
      Makoto Sakuma
    • Organizer
      Tokyo workshop on low-dimensional topology
    • Place of Presentation
      東京工業大学(招待講演)
    • Year and Date
      2012-03-22
    • Related Report
      2011 Annual Research Report
  • [Presentation] On Heckoid groups for 2-bridge links2012

    • Author(s)
      Makoto Sakuma
    • Organizer
      Low dimensional topology and number theorey IV
    • Place of Presentation
      九州大学(招待講演)
    • Year and Date
      2012-03-14
    • Related Report
      2011 Annual Research Report
  • [Presentation] End invariants of Heckoid groups for 2-bridge links2012

    • Author(s)
      Makoto Sakuma
    • Organizer
      RIMS合宿型セミナー「Representation spaces, twisted topological invariants and geometric structures of 3-manifolds」
    • Place of Presentation
      強羅静雲荘
    • Related Report
      2012 Annual Research Report
    • Invited
  • [Presentation] On Heckoid groups for 2-bridge links2012

    • Author(s)
      Makoto Sakuma
    • Organizer
      Group actions and applications in geometry, topology and analysis
    • Place of Presentation
      Kunming, Chaina
    • Related Report
      2012 Annual Research Report
    • Invited
  • [Presentation] Kleinian groups generated by two parabolic transformations2012

    • Author(s)
      Makoto Sakuma
    • Organizer
      研究集会「特異点と多様体の幾何学」
    • Place of Presentation
      山形大学
    • Related Report
      2012 Annual Research Report
    • Invited
  • [Presentation] Simple loops on 2-bridge spheres in even Heckoid orbifolds for 2-bridge links2012

    • Author(s)
      Makoto Sakuma
    • Organizer
      Low-dimensional Geometry and Topology
    • Place of Presentation
      東京工業大学
    • Related Report
      2012 Annual Research Report
    • Invited
  • [Presentation] Simple loops on 2-bridge spheres in 2-bridge link complements2011

    • Author(s)
      Makoto Sakuma
    • Organizer
      Aspects of Hyperbolicity in Geometry, Tbpology and Dynamics
    • Place of Presentation
      Warwick大学,UK(招待講演)
    • Year and Date
      2011-07-28
    • Related Report
      2011 Annual Research Report
  • [Presentation] Simple loops on 2-bridge spheres in 2-bridge link complements2011

    • Author(s)
      Makoto Sakuma
    • Organizer
      Workshop on low-dimensional topology in Shanghai and Suzhou
    • Place of Presentation
      華東師範大学,中国(招待講演)
    • Year and Date
      2011-05-15
    • Related Report
      2011 Annual Research Report
  • [Presentation] A variation of McShane's identity for 2-bridge links2010

    • Author(s)
      作間誠
    • Organizer
      Geometry, Topology and Dynamics of Character Varieties
    • Place of Presentation
      シンガポール国立大学シンガポール(招待講演)
    • Year and Date
      2010-08-13
    • Related Report
      2010 Annual Research Report

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Published: 2010-08-23   Modified: 2019-07-29  

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