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1995 Fiscal Year Final Research Report Summary

Study on Geometric Analysis

Research Project

Project/Area Number 06452006
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field Geometry
Research InstitutionTOHOKU UNIVERSITY

Principal Investigator

SUNADA Toshikazu  Tohoku University Graduate School of Science Professor, 大学院理学研究科, 教授 (20022741)

Co-Investigator(Kenkyū-buntansha) UZAWA Tohru  Tohoku University Graduate School of Science Associate Prof, 大学院理学研究科, 助教授 (40232813)
SAITO K.  Tohoku University Graduate School of Science Associate Prof, 大学院理学研究科, 助教授 (60004397)
BANDO Shigetoshi  Tohoku University Graduate School of Science Professor, 大学院理学研究科, 教授 (40165064)
NISHIKAWA Seiki  Tohoku University Graduate School of Science Professor, 大学院理学研究科, 教授 (60004488)
MORITA Yasuo  Tohoku University Graduate School of Science Professor, 大学院理学研究科, 教授 (20011653)
Project Period (FY) 1994 – 1995
KeywordsGlobal Analysis / Eigonvalue Problem / Quantum Ergodiuty / Oyerator Algebras
Research Abstract

1. We have found a new formulation of quantum ergodicity, and established a remarkable relationship between quantum erogodicity and classical ergodicity. A key concepts is the space average and time average in quantum mechnical systems. The method we took up is geometric analysis of pseudo differential operators and Fourier integral operators.
2. We could establish a theorem on the structure of the spectrum of discrete periodic magnetic Schroedinger operators. In particular, we found a mechanism in terms of group algebras why the band structure comes out. The second cohomology group of graph-automorphism group plays an important role. It is still interesting to investigate the relation between the spectral structure and operator algebras associated with Schroedinger operators on a graph.

  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] 砂田利一: "Euclidean versus non-Enclidean aspects in Spectral geometry" Progress in Theoretical Phys. Supplement. 116. 235-250 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 砂田利一: "A discrete analogue of poriodic Schrodinger Operatorr" Contemporary Math.173. 283-299 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 西川青季: "Harmonic maps of unbounled convex polyhedra in hyperdolic spaces" Inventioncs Math.115. 391-402 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 板東重稔: "Stable sheaves and Eastern-Hermitian metrics" Proc. in "Geometry and Analysis on mamfdds complex. 39-50 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 斉藤和之: "Stvange projections in tensor prolucts of von Neumann algebras" Qnaterly Journal of Math. Oxford. 46. 197-199 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Sunada: "Euclidean versus non-Enclidean aspects in Spectral geometry" Progress in Theiretical Phys. Supplement. 116. 235-250 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Sunada: "A discrete analogue of percodic Schrodinger operators" Contemporary Math.173. 283-299 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Nishikawa: "Harmonie maps of bon bcennded convex polyhedra in hyperbolic spaces" Invent. Math.115. 391-402 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Bando: "Stable sheaves and Einstem-Hermitinn metrics" Proc. in Geometry and Anolgsis on complex Manifolds. 39-50 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Saito: "Strange projectams in tensov products of von Neumann algebrav" Quaterly J.of Math.46. 197-199 (1995)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1997-03-04  

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