| Project/Area Number |
11640088
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Geometry
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| Research Institution | Tokyo Metropolitan University |
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Principal Investigator |
OHNITA Yoshihiro GRADUATE SCHOOL OF SCIENCE, DEPARTMENT OF MATHEMATICS, TOKYO METOROPOLITAN UNIVERSITY PROFESSROR, 理学(系)研究科(研究院), 教授 (90183764)
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| Co-Investigator(Kenkyū-buntansha) |
NAGATOMO Yasuyuki DEPARTMENT OF MATHEMATICS, UNIVERSITY OF TSUKUBA, LECTURER, 数学系, 講師 (10266075)
KAMISHIMA Yoshinobu FACULTY OF SCIENCE, DEPARTMENT OF MATHEMATICS, TOKYO METOROPOLITAN UNIVERSITY PROFESSROR, 理学(系)研究科(研究院), 教授 (10125304)
GUEST Martin A. GRADUATE SCHOOL OF SCIENCE, DEPARTMENT OF MATHEMATICS, TOKYO METOROPOLITAN UNIVERSITY PROFESSROR, 理学(系)研究科(研究院), 教授 (10295470)
KOKUBU Masatoshi DEPARTMENT OF NATURAL SCIENCES, FACULTY OF ENGINEERING, TOKYO DENKI UNIVERSITY, LECTURER, 工学部, 講師 (50287439)
TANAKA Makiko DEPARTMENT OF MATHEMATICS, SCIENCE UNIVERSITY OF TOKYO, LECTURER, 理工学部, 講師 (20255623)
戸田 正人 東京都立大学, 大学院・理学研究科, 助手 (80291566)
橋口 秀子 千葉工業大学, 工学部, 講師 (40296314)
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| Project Period (FY) |
1999 – 2000
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2000: ¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 1999: ¥1,100,000 (Direct Cost: ¥1,100,000)
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| Keywords | Harmonic map / Symmetric space / Moduli space / Yang-Mills-Higgs equation / Integrable system |
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| Research Abstract |
Harmonic maps into symmetric spaces have several characteristic properties that harmonic maps into general Riemannian manifolds do not have. For example such harmonic map equation can be formulated as the zero curvature equation, the Lax equation and gauge-theoretic equations. As an approach for harmonic maps into symmeric spaces, we investigate the gauge-theoretic equations associated to such harmonic maps and the structure and the geometry of the moduli spaces of their solutions, and we obatined several results. I have written up the paper entitled with "Geoemtry of the moduli spaces of harmonic maps into Lie groups via gauge theory over Riemann surfaces" This work was estimated by foreign researchers as it is very interesting and imformative. Furthermore, we studied harmonic maps of finite type which is a class of harmonic maps into compact symmetric spaces. We introduced the notion of harmonic maps of generalized finite type from compact Riemann surfaces to compact k-symmetric spac
… More
es, and we proved that such a harmonic map is the composition of the Abel map from a compact Riemann surface to the Jacobi variety and a pluriharmonic map from the Jacobi variety to a k-symmetric space. We have written up the paper entitled with "Harmonic maps of finite type into generalized flag manifolds and twistor fibrations" They will be published in Inter. J. Math. And J. London Math. Soc., respectively. On the other hand, as the research related to integrable systems, we give our attention to the relationship between Frobenius manifolds and pluriharmonic maps. It is now in progress to study Hamiltonian stability problem for compact minimal Lagrangian submanifolds in complex projective spaces and Hermitian symmetric spaces constructed by using the symmetric space theory and we obtain new results on it.
The collaborator, Makiko Tanaka, treated symmetric R-spaces with nice properties in symmetric spaces and gave the new characterization of symmetric R-spaces from the viewpoint of the basic theory in the category of symmetric spaces through stays at Max-Planck-Institut fuer Mathematik in Bonn, Germany etc. The collaborator, Masatoshi Kokubu,showed new results on propeties and construction of complete isotropic minimal surfaces in odd-dimensional Euclidean space. The collaborator, Hideko Hashiguchi, gave a research report on problems about moduli space of unitons corresponding to harmonic maps from a Riemann sphere into the unitary group at this research meeting. Less
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