| Project/Area Number |
08454016
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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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 | Nagoya University |
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Principal Investigator |
SATO Hajime Nagoya Univ., Graduate School of Mathematics, Professor, 大学院多元数理科学研究科, 教授 (30011612)
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| Co-Investigator(Kenkyū-buntansha) |
YAMATO Kazuo Nagoya Univ., Graduate School of Math, Assoc.Professor, 大学院多元数理科学研究科, 助教授 (30022677)
YASUMOTO Masahiro Nagoya Univ., Graduate School of Math, Assoc.Professor, 大学院多元数理科学研究科, 助教授 (10144114)
EJIRI Norio Nagoya Univ., Graduate School of Mathematics, Assoc.Professor, 大学院多元数理科学研究科, 助教授 (80145656)
SHIOTA Masahiro Nagoya Univ., Graduate School of Mathematics, Professor, 大学院多元数理科学研究科, 教授 (00027385)
TSUCHIYA Akihito Nagoya Univ., Graduate School of Mathematics, Professor, 大学院多元数理科学研究科, 教授 (90022673)
向井 茂 名古屋大学, 大学院・多元数理科学研究科, 教授 (80115641)
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| Project Period (FY) |
1996 – 1997
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| Project Status |
Completed (Fiscal Year 1997)
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| Budget Amount *help |
¥4,600,000 (Direct Cost: ¥4,600,000)
Fiscal Year 1997: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 1996: ¥3,400,000 (Direct Cost: ¥3,400,000)
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| Keywords | differential form / involutive system / twistor / third order ODE / Grassman structure / ツイスター構造 |
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| Research Abstract |
In this reserch during two years, we have studied the twistor diagram constructed by the head investigator. The diagram gives relations between various geometric structures. We use the theory of involutive system of differential forms and clarified the relations of the diagram with the theory of particles and the field theory. Main purpose of our studies is application of the twistor theory to the classical and quantum mechanics. Especially, we investigated the following geometric strustures in detail : The structure defined by third order ordinary differential equations, projective structures, Grassmann structures, Lie contact structures, etc. We showed that in many cases one equation of a structure is transformed to a simple equation of other geometric structure.
As concrete results, the head investigator with Mrs.A.Y.Yoshikawa studied the equivalence problem under contact diffeomorphism of third order ordinary differential equations, proved that the complete invariants are given by two geometric curvatures and decided the concrete form of the curvatures. By the twistor theory, this result is connected to the geometry of the relativity and gives the fundation of projective contact geometry.Further the head investigator studied the Grassmann structures related to the geometry of the system of second order differential equations and made clear the relation between the half flatness and the twistor theory of the null bundles.
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