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Convexity and global behavior of geodesics on Finsler manifolds

Research Project

Project/Area Number 18K03314
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 11020:Geometry-related
Research InstitutionFukuoka Institute of Technology

Principal Investigator

Shiohama Katshiro  福岡工業大学, 付置研究所, 研究員 (20016059)

Co-Investigator(Kenkyū-buntansha) 永野 哲也  長崎県立大学, 情報システム学部, 教授 (00259699)
糸川 銚  福岡工業大学, 情報工学部, 教授 (90223205)
印南 信宏  新潟大学, 自然科学系, フェロー (20160145)
Project Period (FY) 2018-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2021: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2020: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2019: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
KeywordsFinsler metric / non-symmetric distance / geodesic / cut locus / conjugate locus / Christoffel symbols / 非対称距離空間 / 測地線 / クリストッフェル記号 / 二重接束 / 測地線の分岐現象 / 非対称距離構造 / 切断跡 / 凸性 / Busemamnn関数 / 指数写像の正距方位図法 / ミンコフスキー空間 / 非対称距離函数 / 完備フィンスラー多様体 / 正距方位図法 / 凸関数 / アフィン函数 / フィンスラー多様体 / Randers計量 / コンパクト階数1対称空間 / Blaschkeフィンスラー多様体 / 平行性 / 共役跡 / フィンスラー計量 / ランダース計量 / ベアバルト計量
Outline of Final Research Achievements

Let (M,F) be a complete Finsler n-manifold, n>1. We discuss the preimage of a curve c on M under the exponential map at p. If c does not meet the cut locus of p, then it is clearly lifted in the tangent space at p
via the inverse of the exponential map.However it is not possible if c meets the cut locus of p.
We discuss a curve c intersecting the cut locus of p, where it is conjugate to p. We then develop an idea to extend the exponential map at p beyond the cut locus to p.

Academic Significance and Societal Importance of the Research Achievements

完備フィンスラー多様体の一点pに於ける指数写像がpの切断跡を延長して議論する事によって切断跡の微分可能性について議論出来る様になった点は大きな意義がある。フィンスラー多様体の距離関数が非対称である事に鑑みて
この議論は極めて重要であると考えられる.

Report

(6 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (14 results)

All 2022 2021 2020 2019 2018

All Journal Article (7 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 7 results,  Open Access: 3 results) Presentation (4 results) (of which Int'l Joint Research: 2 results,  Invited: 1 results) Book (3 results)

  • [Journal Article] Geodesic families characterizing flat metrics on a cylinder and a plane2022

    • Author(s)
      N.Innami--Y.Itokawa--T.Nagano--K.Shiohama
    • Journal Title

      MATHEMATICA SCANDINAVICA

      Volume: 128 Issue: 2

    • DOI

      10.7146/math.scand.a-132247

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Axial straight lines in the covering surface of a Finsler surface2021

    • Author(s)
      印南信広ー糸川銚ー永野哲也ー塩濱勝博
    • Journal Title

      Nihonkai Mathematical Journal

      Volume: 32

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Affine Functions and Busemann Functions on Complete Finsler manifolds2021

    • Author(s)
      N.Innami--Y.Itokawa--T.Nagano--K.Shiohama
    • Journal Title

      Proceedings of the American Mathematical Society

      Volume: 149

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] The Azimuthal Euidistant Projection for a Finsler Manifold by the Exponential Map2020

    • Author(s)
      N.Innami--Y.Itokawa--T.Nagano--K.Shiohama
    • Journal Title

      Pacific Journal of Mathematics

      Volume: 308

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Notes on Reversibility and Branching of Geodesics in Finsler Spaces2019

    • Author(s)
      T.Nagano-N.Innami-Y.Itokawa-K.Shiohama
    • Journal Title

      Bull. Inst. Politeh. Din Iasi (Romania)

      Volume: 65

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Blaschke Finsler Manifolds and actions of Projective Randers Changes on Cut Loci2019

    • Author(s)
      N.Innami-Y.Itokawa-T.Nagano-K.Shiohama
    • Journal Title

      Transactions of American Mathematical Society

      Volume: 371

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Blaschke Finsler Manifolds and Actions of Projective Randers Changes on Cut Loci2019

    • Author(s)
      N.Innami, Y.Itokawa, T.Nagano and K.Shiohama
    • Journal Title

      Trans. Amer. Math. Soc.

      Volume: Vol 371, No. 10

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Presentation] フィンスラー空間の非可逆測地線の乖離を測る量2022

    • Author(s)
      永野哲也
    • Organizer
      2022日本数学会秋季総合分科会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Approach to Cryptography from Differential Geometry with Example2020

    • Author(s)
      永野哲也
    • Organizer
      The 13-th International Conference SecITC 2020
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Affine Functions on Complete Finsler Manifolds2019

    • Author(s)
      塩濱勝博
    • Organizer
      第54回フィンスラー幾何学シンポジウム
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Affine Functions on complete Finsler manifolds2018

    • Author(s)
      K.Shiohama
    • Organizer
      The 53-rd. International Symposium on Finsler Geometry
    • Related Report
      2018 Research-status Report
  • [Book] Innovation Security Solutions for Information Technology and Communications2021

    • Author(s)
      T.Nagano--H.Anada
    • Total Pages
      302
    • Publisher
      Springer Nature, Switaerland
    • Related Report
      2020 Research-status Report
  • [Book] Geometry in History2019

    • Author(s)
      S.G.Dani and A.Papadopoulos (Editors)
    • Total Pages
      750
    • Publisher
      Springer Nature Switzerland AG 2019
    • ISBN
      9783030136086
    • Related Report
      2019 Research-status Report
  • [Book] The Global Study of Riemannian-Finsler Geometry --to the memory of Marcel Berger--2018

    • Author(s)
      K.Shiohama and B.Tiwari
    • Publisher
      Springer-Verlag, arXiv:1811552v1
    • Related Report
      2018 Research-status Report

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Published: 2018-04-23   Modified: 2024-01-30  

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