| Project/Area Number |
12640037
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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 | Tohoku-Gakuin University |
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Principal Investigator |
ASHIKAGA Tadashi Faculty of Engineering, Tohoku-Gakuin University, Professor, 工学部, 教授 (90125203)
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| Project Period (FY) |
2000 – 2001
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 2001: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2000: ¥700,000 (Direct Cost: ¥700,000)
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| Keywords | degeneration / morsification / family of curves / atomic fiber / signature / monodromy / hyperlliptic curre / semi-stable reduction / Morsification / splitting family / Horikawa index / modali map / atomic fiber / degeneration / monodromy / stable curve |
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| Research Abstract |
We continued the study of the Modification problem of degenerate families of hyperelliptic curves with Tatsuya Arakawa. We obtained the results about the certain obstruction for the existence of hyperelliptic splitting families, the classification of hyperelliptic atomic fibers of genus 3 and so on. We wrote the paper with him entitled "Local splitting families of hyperelliptic pencils, II". (The part I of this series was already published, see "REFERENCES".)
Based on the recent studies of myself and Kazuhiro Konno, we wrote the survey paper with him about the results and open problems in the field of global and local studies of pencils of algebraic curves, see "REFERENCES".
We obtained the certain formula of the signature defect of degeneration of curves, which comes from the semi-stable reduction of the family. This is an application of the G-signature theorem of Atiyah-Singer. We are now trying to develop this study, and will publish it in near future.
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