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Research on manifolds by ample vector bundles

Research Project

Project/Area Number 13640047
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Algebra
Research InstitutionWaseda University

Principal Investigator

MAEDA Hidetoshi  School of Science and Engineering, Professor, 理工学部, 教授 (10229312)

Project Period (FY) 2001 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥2,700,000 (Direct Cost: ¥2,700,000)
Fiscal Year 2002: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2001: ¥1,700,000 (Direct Cost: ¥1,700,000)
KeywordsPolarized manifolds / Vector bundles / Algebraic geometry
Research Abstract

1. Let E be an ample vector bundle of rank n-2【greater than or equal】 2 on a complex projective manifold X of dimension n having a section whose zero locus is a smooth surface Z. The structure of pairs (X, E) as above under the assumption that Z is a properly elliptic surface is determined. This generalizes known results on threefolds containing an elliptic surface as a smooth ample divisor.
2. Let E be a vector bundle of rank n - 1 on a smooth complex projective variety X of dimension n 【greater than or equal】 3, and let g(X, E) be the curve genus of (X, E) defined by the formula 2g(X, E) - 2 = (K_X + c_1(E))c_<n-1>(E), where K_X is the canonical bundle of X. Then it is proved that g(X, E) is a nonnegative integer if E is ample. Moreover, polarized pairs (X, E) with g(X, E) 【less than or equal】 1 are completely classified.
3. Let E be a very ample bundle of rank n - 1 on a smooth complex projective variety X of dimension n 【greater than or equal】 3, and let g(X, E) be the curve genus of (X, E) defined by the formula 2g(X, E) - 2 = (K_X + c_1(E))c_<n-1>(E), where K_X is the canonical bundle of X. Then the pairs (X, E) with g(X, E) = 2 are classified.
4. Let X be a smooth complex projective variety and let Z be a smooth submanifold of dimension 【greater than or equal】 2 of X, which is the zero locus of a section of an ample vector bundle E of rank dim X - dim Z 【greater than or equal】 2 on X. Let H be an ample line bundle on X whose restriction H_Z to Z is very ample. Triplets (X, E, H) as above are studied and classified under the assumption that Z is a projective manifold admitting a curve section which is a double cover of an elliptic curve.

Report

(3 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • Research Products

    (11 results)

All Other

All Publications (11 results)

  • [Publications] A.Lanteri, H.Maeda: "Elliptic surfaces and ample vector bundles"Pacific Journal of Mathematics. 200-1. 147-157 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H.Maeda, A.J.Sommese: "Very ample vector bundles of curve genus two"Archiv der Mathematik. 79-1. 74-80 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Hidetoshi Maeda: "Generalization of the virtual arithmetic genus of a smooth polarized surface"Milan Journal of Mathematics. 70-1. 291-308 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] A.Lanteri, H.Maeda: "Ample vector bundles with zero loci having a bielliptic curve section"Collectanea Mathematica. 54-1. 73-85 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Antonio Lanteri and Hidetoshi Maeda: "Elliptic surfaces and ample vector bundles"Pacific Journal of Mathematics. 200-1. 147-157 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Hidetoshi Maeda and Andrew J. Sommese: "Very ample vector bundles of curve genus two"Archiv der Mathematik. 79-1. 74-80 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Hidetoshi Maeda: "Generalization of the virtual arithmetic genus of a smooth polarized surface"Milan Journal of Mathematics. 70-1. 291-308 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Antonio Lanteri and Hidetoshi Maeda: "Ample vector bundles with zero loci having a bielliptic curve section"Collectanea Mathematica. 54-1. 73-85 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Hidetoshi Maeda: "Generalization of the virtual arithmetic genus of a smooth polarized surface"Milan Journal of Mathematics. 70・1. 291-308 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Antonio Lanteri, Hidetoshi Maeda: "Ample vector bundles with zero loci having a bielliptic curve section"Collectanea Mathematica. 54・1. 73-85 (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] Hidetoshi Maeda: "Generalization of the virtual arithmetic genus of a smooth polarized surface"Milan Journal of Mathematics. (発表予定). (2002)

    • Related Report
      2001 Annual Research Report

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Published: 2001-04-01   Modified: 2016-04-21  

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