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A study of mixed Hodge structures for semisatable log smooth degenerations

Research Project

Project/Area Number 16K05107
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Algebra
Research InstitutionTokyo Denki University

Principal Investigator

Fujisawa Taro  東京電機大学, 工学部, 教授 (60280385)

Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2018: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2017: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Keywords混合ホッジ構造 / 対数幾何 / 対数構造 / 対数幾何学
Outline of Final Research Achievements

I proved the following:
The relative log de Rham cohomology groups of a projective semistable log smooth degeneration carry natural mixed Hodge structures, whose wieght filtrations coincide with the monodromy weight filtration of certain natural nilpotent endomorphisms under appropriate shifts. Moreover, they admit natural polarization as mixed Hodge structures.
In addition, I proved the E_2-degeneracy of the spectral sequence associated to another filtration on the complex quasi-isomorphic to the relative log de Rham complex of a projective semistable log smooth degeneration.

Academic Significance and Societal Importance of the Research Achievements

本研究の成果の一つであるウェイトフィルトレーションとモノドロミー・ウェイトフィルトレーションが一致するという事実は、Green-Griffiths が彼等の論文の中で提出した問いの一部に対数幾何学の立場から肯定的に答えるものであり、対数的解析空間の混合ホッジ理論について一つの新しい知見を与えるものである。
さらに、本研究で示されたスペクトル系列のE_2退化は、Green-Griffiths の問いへのより完全な解答に向けて重要な一歩となる。

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (3 results)

All 2018 2016

All Journal Article (1 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (2 results) (of which Int'l Joint Research: 1 results,  Invited: 2 results)

  • [Journal Article] A remark on the decomposition theorem for direct images of canonical sheaves tensorized with semipositive vector bundles2016

    • Author(s)
      Taro Fujisawa
    • Journal Title

      Proceedings of the Japan Academy, Series A

      Volume: 92 Issue: 7 Pages: 84-85

    • DOI

      10.3792/pjaa.92.84

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Weight filtrations on the log de Rham cohomology groups of a semistable log smooth degeneration2018

    • Author(s)
      藤澤太郎
    • Organizer
      Workshop: Log geometry, degenerations and related topics
    • Related Report
      2017 Research-status Report
    • Invited
  • [Presentation] Mixed Hodge structures on semistable log smooth degenerations2016

    • Author(s)
      藤澤太郎
    • Organizer
      Kinosaki algebraic geometry symposium 2016
    • Place of Presentation
      兵庫県豊岡市城崎町 城崎国際アートセンター
    • Year and Date
      2016-10-18
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research / Invited

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Published: 2016-04-21   Modified: 2020-03-30  

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