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2004 Fiscal Year Final Research Report Summary

Hessian Geometry and Information Geometry

Research Project

Project/Area Number 15540080
Research Category

Grant-in-Aid for Scientific Research (C)

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

Principal Investigator

SHIMA Hirohiko  Yamaguchi University, Faculty of Science, Prof., 理学部, 教授 (70028182)

Co-Investigator(Kenkyū-buntansha) NAKAUCHI Nobumitsu  Yamaguchi University, Faculty of Sciences, Assoc.Prof., 理学部, 助教授 (50180237)
YOSHIMURA Hiroshi  Yamaguchi University, Faculty of Sciences, Assoc.Prof., 理学部, 助教授 (00182824)
MAKINO Tetsu  Yamaguchi University, Faculty of Engineering, Prof., 工学部, 教授 (00131376)
KITAMOTO Takuya  Yamaguchi University, Faculty of Education, Assoc.Prof., 教育学部, 助教授 (30241780)
KOMIYA Katsihiro  Yamaguchi University, Faculty of Science, Prof., 理学部, 教授 (00034744)
Project Period (FY) 2003 – 2004
KeywordsHessian metrics / Hessian structures / Hessian manifolds / Codazzi structures / dual connections / Information geometry / affine differential geometry
Research Abstract

Let M be a flat manifold with flat connection D. A Riemannian metric g on M is said to be a Hessian metric if it is locally expressed by the Hessian with respect to the flat connection D. Hessian geometry (the geometry of Hessian manifolds) is a very close relative of Kahlerian geometry, and may be placed among, and finds connection with important pure mathematical fields such as affine differential geometry, homogeneous spaces, cohomology and others. Moreover, Hessian geometry, as well as being connected with these pure mathematical areas, also, perhaps surprisingly, finds deep connections with information geometry. The notion of flat dual connections, which plays an important role in information geometry, appears in precisely the same way for our Hessian structures. Thus Hessian geometry offers both an interesting and fruitful area of research. In this project we study Hessian geometry putting together Kahlerian geometry, affine differential geometry and information geometry, and obtained the following results.
1.We constructed new Hessian metrics applying a method of information geometry. Conversely, we obtained families of probability distributions using a differential geometric method.
2.We developed affine differential geometry of level surfaces of potential functions of Hessian metrics, and investigating Laplacians of gradient mappings we proved a certain problem similar to the affine Bernstein's problem proposed by S.S. Chern.
3.We obtained a duality theorem and vanishing theorems for Hessian manifolds similar to that of Kahlerian geometry.
4.Since a Hessian structure satisfies the Codazzi equation, the notion of Hessian structures is naturally extended to the Codazzi structures. We proved that a manifold with a constant Codazzi structure has an immersion into a certain homogeneous Hessian manifold of codimension 1.

  • Research Products

    (9 results)

All 2005 2004 Other

All Journal Article (7 results) Book (2 results)

  • [Journal Article] On computation of a coefficient of a power series root2005

    • Author(s)
      Takuya Kitamoto
    • Journal Title

      IEICE Trans.Fundamentals (to appear)

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] The divisibility in the cut-and-paste group of G-manifolds and fibring over the circle within a cobordism class2005

    • Author(s)
      Katsuhiro, Komiya
    • Journal Title

      Osaka J.Math 42(to appear)

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] The divisibility in the cut-and-paste group of G-manifolds and fibring over the circle within a cobordism class2005

    • Author(s)
      Katsuhiro Komiya
    • Journal Title

      Osaka J.Math. 42

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] On computation of a coefficient of a power series root2005

    • Author(s)
      Takuya Kitamoto
    • Journal Title

      IEICE Trans.Fundamentals

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] On spherically symmetric solutions of the relativistic Euler equation2004

    • Author(s)
      C.H.Hsu, S.S.Lin, T.Makino
    • Journal Title

      J.Differential Equations 201

      Pages: 1-24

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Decaying solution of a Navier-Stokes flow without surface tension

    • Author(s)
      Yasushi Hataya
    • Journal Title

      J.Math.Kyoto Univ. (to appear)

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Decaying solution of a Navier-Stokes flow without surface tension

    • Author(s)
      Yasushi Hataya
    • Journal Title

      J.Math.Kyoto Univ. (to appear)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Book] Geometry of Hessian structures2005

    • Author(s)
      Hirohiko Shima
    • Total Pages
      250
    • Publisher
      World Scientific
    • Description
      「研究成果報告書概要(和文)」より
  • [Book] Geometry of Hessian Structures2005

    • Author(s)
      Hirohiko Shima
    • Total Pages
      250
    • Publisher
      World Scientific
    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2006-07-11  

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