| Project/Area Number |
09640133
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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 | NIHON UNIVERSITY |
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Principal Investigator |
UDAGAWA Seiichi School of Medicine, NIHON UNIVERSITY, Lecturer, 医学部, 講師 (70193878)
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| Project Period (FY) |
1997 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1999: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1998: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1997: ¥500,000 (Direct Cost: ¥500,000)
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| Keywords | Harmonic Map / Primitive Map / Compact Symmetric Space / k-symmetric space / finite type / twistor fibration / Pluriharmonic Map / Abel Map / ツィスター射影 / ツィスター構成 / Harmonic map / two-tori / complex Grass mannian / Spectral carve / dressing transtorm / トーラス / 複素グラスマン多様体 / スペクトル・データ / 非超極小 |
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| Research Abstract |
In our study, I obtained three main results. I expain each of them separately.
(1) F. Burstall proved that any weakly conformal non-isotropic harmonic map of 2-torus into a sphere or a complex projective space can be lifted to a primitive map of finite type into some k-symmetric space. We generalized the result of F. Burstall to obtain that any weakly conformal non-isotropic harmonic map of 2-torus into a sphere or a complex projective space is itself of finite type. In fact, we can prove a more general result. Given a primitive map of finite type into a generalized flag manifold, we can project it into some compact symmetric space as a harmonic map of finite type under some condition on the choice of isotropy subgroup of the compact symmetric space. The condition is rather mild and satisfied by the above cases (except odd-dimensional sphere. But, this case is included the case of even-dimensional sphere).
(2) We extended the result (1) to the case where the domain is a complex manifold and pluriharmonic maps into it. We proved that any non-isotropic pluriharmonic map of complex torus into a complex projective space is of finite type.
(3) We introduced the concept of primitive maps of generalized finite type and obtained some results on the harmonic maps of compact Riemann surfaces of higher genus. In fact, any primitive harmonic maps of generalized finite type of a compact Riemann surface of genus greater than 1 into a k-symmetric space is a composition of a primitive pluriharmonic map of finite type of some Jacobian torus into a k-symmetric space with a Abel map of the compact Riemann surface into the Jacobian torus.
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