| Project/Area Number |
20540071
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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 | Nagoya Institute of Technology |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
YAMAGISHI Masakazu 名古屋工業大学, 大学院・工学研究科, 准教授 (40270996)
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| Co-Investigator(Renkei-kenkyūsha) |
MAEDA Sadahiro 佐賀大学, 大学院・工学系研究科, 教授 (40181581)
EJIRI Norio 名城大学, 理工学部, 教授 (80145656)
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| Project Period (FY) |
2008 – 2011
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| Project Status |
Completed (Fiscal Year 2011)
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| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2011: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2010: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2009: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2008: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
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| Keywords | 微分幾何学 / 佐々木磁場 / 円軌道 / A型実超曲面 / キリング螺旋 / レングス・スペクトラム / ケーラー磁場 / 負曲率多様体 / 構造捩率 / 軌道球面 / 体積要素 / 複素双曲空間 / 辺2色彩色グラフ / 軌道 / ゼータ関数 / エントロピー / 距離と弧長 |
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| Research Abstract |
In order to study properties of submanifolds in Kaehler manifolds, we consider natural closed 2-forms on submanifolds which are induced by almost contact metric structures. We study motions of electric charged particles of unit speed under actions of Sasakian magnetic fields, which are constant multiples of natural 2forms, on submanifolds. Since strengths of Sasakian magnetic fields acting on charged particles are not uniform, we are interested in the problem whether there exist trajectories which are also curves of order 2. From the viewpoint of classical Frenet-Serre formula, we may say that curves of order 2 are simple. We study submanifolds in complex space forms, which are highly symmetric. We show that there exist such trajectories on real hypersurfaces of type A whose class includs geodesic spheres. We can characterize these real hypersurfaces by the amount of such trajectories. We also show how lengths of closed trajectories which are also curves of order 2 are distributed on the real line.
Besides, we give discrete models of Kaehler manifolds. We propose graphs whose edges are colored by 2 colors to be good models. We studied distribution of closed passes on these graphs and show a similarity between the distribution of lengths of closed passes on graphs and that of closed trajectories on Kaehler manifolds.
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