Research on arithmetic and geometry for algebraic varieties in positive characteristic.
| Project/Area Number |
17540027
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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 |
Algebra
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| Research Institution | Hiroshima University |
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Principal Investigator |
ITO Hiroyuki Hiroshima University, Graduate School of Engineering, Associate Professor (60232469)
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| Co-Investigator(Kenkyū-buntansha) |
HIROKADO Masayuki Hiroshima University, Graduate School of Information Sciences, Lecturer (40316138)
SAITO Natsuo Hiroshima University, Graduate School of Information Sciences, Lecturer (70382372)
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| Project Period (FY) |
2005 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥3,800,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥300,000)
Fiscal Year 2007: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2006: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 2005: ¥1,300,000 (Direct Cost: ¥1,300,000)
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| Keywords | Algebraic Geometry in positive characteristic / Calabi-Yau varieties / Rational singularities / (quasi-elliptic) elliptic surfaces / K3 surfaces / Canonical singularities / 代数学 / 正標数の代数多様体 / 特異点 / Mordell-weil格子 / 正標数 / 準楕円曲面 / 超特異K3曲面 / モジュライ空間 / 楕円曲面 |
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| Research Abstract |
The purposes of this research are
1) deep study of the algebraic varieties in positive characteristic, especially, elliptic (qasi-elliptic) surfaces, K3 surfaces and Calabi-Yau threefolds
2) to give a new insight for the theory of singularities in positive characteristic.
For these 3 years research term, we got the following advances related with the above purposes.
1) We gave new examples for non-liftable Calabi-Yau threefolds in characteristic both 2 and 3.
2) In the process on the construction above, we investigated the quasi-elliptic surfaces deeply, and we got various new 3-dimensional raional singularities which have crepant resolutions by giving the explicit resolution processes.
3) By deep study on the moduli of 2-dimensional rational double points, we fond NEW pathological phenomena in 3-dimensional singularities, which must give a progress on the study of 3-dimensional canonical singularities in positive characteristic.
Each results play an important role on the research of algebraic varieties in positive characteristic. We are going to pursue further study on these subjects.
We also got the explicit relation between a deformation of a singularities of type E_8 and the Mordell-Weil lattices in characteristic 2. As an application of this, we gave the explicit construction of the universal family of moduli space of supersingular K3 surfaces in characteristic 2.
Finally, we also studied the relationship between the theory of Mordell-Weil lattices and the index calculus attack to the elliptic curve cryptosystems, but we could not get the useful strategy for the attack.
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Report
(4 results)
Research Products
(41 results)
