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Spectra of Laplacians for Kaehler graphs

Research Project

Project/Area Number 16K05126
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Geometry
Research InstitutionNagoya Institute of Technology

Principal Investigator

Adachi Toshiaki  名古屋工業大学, 工学(系)研究科(研究院), 教授 (60191855)

Project Period (FY) 2016-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2019: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2018: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2017: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2016: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Keywordsケーラーグラフ / 隣接行列 / 正規性 / ゼータ関数 / 2色彩道 / 誘導グラフ / 隣接作用素 / 可換性 / 積グラフ / normal Kahler graphs / adjacency operators / vertex-transitive / product operations / 実超曲面 / 佐々木磁場 / 軌道の外的形状 / 佐々木空間形 / ペロン・フロベニウスの定理 / 2部グラフ / 最大固有値 / 閉二色彩道 / 頂点推移的 / 双対グラフ / 幾何学
Outline of Final Research Achievements

A Kaehler graph is formed by sets of vertices, of principal edges and of auxiliary edges. On this graph we consider (p,q)-bicolored paths which are formed by p-step paths of principal edges followed by q-step paths of auxiliary edges. We studied the (p,q)-zeta function, which is the generating function of closed (p,q)-bicolored paths, and showed that it is meromorphic on the whole plane. Though Kaehler graphs themselves are non-directed, their (p,q)-zeta functions have properties similar to those for directed graphs. Therefore, as a model corresponding to complex space forms, we considered normal Kaehler graphs which are regular and whose adjacency matrices obtained by principal and auxiliary edges are commutative. Under an assumption on a given Kaehler graph, we could show connectivity and non-bipartiteness of the (p,q)-derived graph for every pair (p,q) by studying eigenvalues of adjacency operators, and obtain poles of zeta functions only by properties of the Kaehler graph.

Academic Significance and Societal Importance of the Research Achievements

頂点と辺とからなるグラフは、古くからリーマン多様体の離散モデルとして扱われてきて、辺の連続である道は測地線に対応すると考えられ、辺による頂点の隣接性を表す隣接作用素は情報伝搬表示として多様体のラプラシアンに相当する物として考察されてきた。研究者は、幾何構造を持つリーマン多様体では測地線だけではなく幾何構造に付随した曲線族をも対象として考察し、幾何構造に対応する磁場のもとでの軌道の研究をしてきた。今回の研究ではこのような多様体の離散モデルを構成し、軌道やラプラシアンに相当する物を導入して基本性質を調べることで、複素等質多様体に対応する正規ケーラーグラフを得、この方面の研究の基礎が構築された。

Report

(7 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • 2018 Research-status Report
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (32 results)

All 2022 2021 2020 2019 2018 2017 2016 Other

All Int'l Joint Research (2 results) Journal Article (19 results) (of which Int'l Joint Research: 6 results,  Peer Reviewed: 19 results,  Open Access: 1 results,  Acknowledgement Compliant: 4 results) Presentation (9 results) (of which Int'l Joint Research: 5 results,  Invited: 4 results) Book (2 results)

  • [Int'l Joint Research] 内モンゴル民族大学(中国)

    • Related Report
      2018 Research-status Report
  • [Int'l Joint Research] 内蒙古民族大学数学学院(中国)

    • Related Report
      2017 Research-status Report
  • [Journal Article] A note on zeta functions of Ihara type for normal Kaehler graphs2022

    • Author(s)
      Adachi Toshiaki
    • Journal Title

      Discrete Mathematics

      Volume: 345 Issue: 2 Pages: 112688-112688

    • DOI

      10.1016/j.disc.2021.112688

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Kaehler graphs whose principal graphs are of Cartesian product type2022

    • Author(s)
      Adachi Toshiaki
    • Journal Title

      New Horizons in Differential Geometry and its Related Fields

      Pages: 209-231

    • DOI

      10.1142/9789811248108_0013

    • ISBN
      9789811248092, 9789811248108
    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Distances From Unbounded Trajectories to Their Limit-Strings on a Hadamard K?hler Manifold2021

    • Author(s)
      Adachi Toshiaki
    • Journal Title

      Results in Mathematics

      Volume: 76 Issue: 3

    • DOI

      10.1007/s00025-021-01464-9

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Regular and vertex-transitive Kaehler graphs having commutative principal and auxiliary adjacency operators2020

    • Author(s)
      Adachi Toshiaki、Chen Guanyuan
    • Journal Title

      Graphs and Combinatorics

      Volume: 36 Issue: 4 Pages: 933-958

    • DOI

      10.1007/s00373-020-02151-2

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Length spectrum of complete simply connected Sasakian space forms2020

    • Author(s)
      Adachi Toshiaki、Maeda Sadahiro
    • Journal Title

      Differential Geometry and its Applications

      Volume: 70 Pages: 101625-101625

    • DOI

      10.1016/j.difgeo.2020.101625

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Asymptotic behaviors of trajectories on a Hadamard Kaehler manifold2020

    • Author(s)
      SHI Qingsong、ADACHI Toshiaki
    • Journal Title

      Tokyo Journal of Mathematics

      Volume: 43 Issue: 2 Pages: 481-495

    • DOI

      10.3836/tjm/1502179311

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Eigenvalues of regular Kaehler graphs having commutative adjacency operators2020

    • Author(s)
      Toshiaki ADACHI
    • Journal Title

      Recent Topics in Differential Geometry and its Related Fields

      Pages: 83-106

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Extrinsic shapes of trajectories on real hypersurfaces of type (B) in a complex hyperbolic space2020

    • Author(s)
      Toshiaki ADACHI & Tuya BAO
    • Journal Title

      Recent Topics in Differential Geometry and its Related Fields

      Pages: 183-202

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Comparison theorem on trajectory-harps for Kaehler magnetic fields which are holomorphic at their arches2019

    • Author(s)
      Toshiaki ADACHI & Qingsong SHI
    • Journal Title

      Hokkaido Mathematical Journal

      Volume: 48 Pages: 427-441

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] A study on trajectory-horns for Kaehler magnetic fields2018

    • Author(s)
      Toshiaki ADACHI
    • Journal Title

      Contemporary Perspectives in Differential Geometry and its Related Fields

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Zeta functions for a Kaehler graph2018

    • Author(s)
      Toshiaki ADACHI, Yaermaimaiti TUERXUNMAIMAITI
    • Journal Title

      Kodai Mathematical Journal

      Volume: 41

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Accurate trajectory-harps for K\"ahler magnetic fields2018

    • Author(s)
      Toshiaki ADACHI
    • Journal Title

      Journal of Mathematical Society of Japan

      Volume: 70

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Extrinsic circular trajectories on geodesic spheres in a complex projective space2017

    • Author(s)
      Tuya BAO, Toshiaki ADACHI
    • Journal Title

      Osaka Journal of Mathematics

      Volume: 54 Pages: 737-747

    • NAID

      120006378348

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Horocycle trajectories and their limit-strings on a complex hyperbolic space2017

    • Author(s)
      Toshiaki ADACHI
    • Journal Title

      International Journal of Pure Mathematics

      Volume: 4 Pages: 37-40

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] Homogeneous Hopf hypersurfaces in a complex hyperbolic space and extrinsic shapes of their trajectories2017

    • Author(s)
      Tuya BAO, Toshiaki ADACHI
    • Journal Title

      International Jopurnal of Pure Mathematics

      Volume: 4 Pages: 22-25

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Characterizations of some homogeneous Hopf real hypersurfaces in a nonflat complex space form by extrinsic shapes of trajectories2016

    • Author(s)
      Bao TUYA, Toshiaki ADACHI
    • Journal Title

      Differential Geometry and its Applications

      Volume: 48 Pages: 104-118

    • DOI

      10.1016/j.difgeo.2016.06.007

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] A note on vertex-transitive Kaehler graphs2016

    • Author(s)
      Yaermaimaiti TUERXUNMAIMAITI, Toshiaki ADACHI
    • Journal Title

      Hokkaido Mathematical Journal

      Volume: 45

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Extrinsic circular trajectories on totally eta-umbilic real hypersurfaces in a complex hyperbolic space2016

    • Author(s)
      Bao TUYA, Toshiaki ADACHI
    • Journal Title

      Kodai Mathematical Journal

      Volume: 39

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Trajectories on real hypersurfaces of type A_2 which can be seen as circles in a complex hyperbolic space2016

    • Author(s)
      Toshiaki ADACHI
    • Journal Title

      Note di Matematica

      Volume: 37 Suppl 1

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Presentation] 「正規ケーラーグラフに対する井原型ゼータ関数」の習作2019

    • Author(s)
      足立俊明
    • Organizer
      還暦記念研究集会 「Hideya60」
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] Distance from unbounded trajectories to their limit-strings on a Hadamard Kaehler manifold2018

    • Author(s)
      Toshiaki ADACHI
    • Organizer
      Inteernational Conference on Recent Advances in Pure and Applied Mathematics 2018
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Asymptotic Behaviors of Trajectories on a Hadamard Kaehler manifold2018

    • Author(s)
      Toshiaki ADACHI
    • Organizer
      Geometric Days in Iasi 2018
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Eigenvalues of finite vertex-transitive Kaehler graphs and their Zeta Functions2018

    • Author(s)
      Toshiaki ADACHI
    • Organizer
      6th Inteernational Colloquium on Differential Geometry and its Related Fields
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Vertex-transitive K\"ahler graphs whose adjacency operators are commutative2017

    • Author(s)
      Toshiaki ADACHI
    • Organizer
      2nd Malta Conference in Graph Theory and Combinatorics
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Horocycle trajectories and their limit-strings on a complex hyperbolic space2017

    • Author(s)
      Toshiaki ADCHI
    • Organizer
      The 2017 International Conference on Differential Geometry and Applications
    • Related Report
      2017 Research-status Report
  • [Presentation] Homogeneous Hopf hypersurfaces in a complex hyperbolic space and extrinsic shapes of their trajectories2017

    • Author(s)
      Tuya BAO, Toshiaki ADCHI
    • Organizer
      The 2017 International Conference on Differential Geometry and Applications
    • Related Report
      2017 Research-status Report
  • [Presentation] アダマール・ケーラー多様体上の軌道ハープ2017

    • Author(s)
      足立俊明
    • Organizer
      2017年度福岡大学微分幾何研究会
    • Related Report
      2017 Research-status Report
    • Invited
  • [Presentation] Trajectory-harps and horns for Kaehler magnetic fields2016

    • Author(s)
      Toshiaki ADACHI
    • Organizer
      5th International Colloquium on Differential Geometry and its Related Fields
    • Place of Presentation
      Veliko Tarnovo, Bulgaria
    • Year and Date
      2016-09-06
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Book] New Horizons in Differential Geometry and its Related Fields2022

    • Author(s)
      Adachi Toshiaki, Hashimoto Hideya
    • Total Pages
      248
    • Publisher
      World Scientific Co.
    • ISBN
      9789811248092
    • Related Report
      2021 Annual Research Report
  • [Book] Recent Topics in Differential Geometry and its Related Fields2020

    • Author(s)
      Toshiaki ADACHI & Hideya HASHIMOTO
    • Total Pages
      209
    • Publisher
      World Scientific Co.
    • ISBN
      9789811206689
    • Related Report
      2019 Research-status Report

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Published: 2016-04-21   Modified: 2023-01-30  

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