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Seshadri constants on surfaces with Picard number 1

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Abstract

Let X be a smooth projective surface with Picard number 1. Let L be the ample generator of the Néron–Severi group of X. Given an integer \(r\ge 2\), we prove lower bounds for the Seshadri constant of L at r very general points in X.

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References

  1. Bauer, T.: Seshadri constants on algebraic surfaces. Math. Ann. 313(3), 547–583 (1999)

    Article  MathSciNet  MATH  Google Scholar 

  2. Bauer, T., Di Rocco, S., Harbourne, B., Kapustka, M., Knutsen, A., Syzdek, W., Szemberg, T.: A Primer on Seshadri Constants, Interactions of Classical and Numerical Algebraic Geometry. Contemporary Mathematics, vol. 496. American Mathematical Society, Providence (2009)

    MATH  Google Scholar 

  3. Bauer, T., Szemberg, T.: Seshadri constants on surfaces of general type. Manuscr. Math. 126(2), 167–175 (2008)

    Article  MathSciNet  MATH  Google Scholar 

  4. Biran, P.: Constructing new ample divisors out of old ones. Duke Math. J. 98(1), 113–135 (1999)

    Article  MathSciNet  MATH  Google Scholar 

  5. Demailly, J.P.: Singular Hermitian Metrics on Positive Line Bundles, Complex Algebraic Varieties (Bayreuth, 1990). Lecture Notes in Mathematics, vol. 1507, pp. 87–104. Springer, Berlin (1992)

    Google Scholar 

  6. Ein, L., Lazarsfeld, R.: Seshadri constants on smooth surfaces. Journées de Géométrie Algébrique d’Orsay (Orsay, 1992), Astérisque No. 218, pp. 177–186. (1993)

  7. Farnik, Ł., Szemberg, T., Szpond, J., Tutaj-Gasińska, H.: Restrictions on Seshadri constants on surfaces, arXiv:1602.08984v1, to appear in Taiwanese. J. Math

  8. Hanumanthu, K.: Positivity of line bundles on general blow ups of \({\mathbb{P}}^2\). J. Algebra 461, 65–86 (2016)

    Article  MathSciNet  MATH  Google Scholar 

  9. Harbourne, B.: Seshadri constants and very ample divisors on algebraic surfaces. J. Reine Angew. Math. 559, 115–122 (2003)

    MathSciNet  MATH  Google Scholar 

  10. Harbourne, B., Roé, J.: Discrete behavior of Seshadri constants on surfaces. J. Pure Appl. Algebra 212(3), 616–627 (2008)

    Article  MathSciNet  MATH  Google Scholar 

  11. Harbourne, B., Roé, J.: Computing multi-point Seshadri constants on \({\mathbb{P}}^2\). Bull. Belg. Math. Soc. Simon Stevin 16(5), 887–906 (2009). Linear systems and subschemes

    MathSciNet  MATH  Google Scholar 

  12. Hartshorne, R.: Ample Subvarieties of Algebraic Varieties, Notes Written in Collaboration with C. Musili. Lecture Notes in Mathematics, vol. 156. Springer, Berlin (1970)

    Book  MATH  Google Scholar 

  13. Küchle, O.: Multiple point Seshadri constants and the dimension of adjoint linear series. Ann. Inst. Fourier (Grenoble) 46(1), 63–71 (1996)

    Article  MathSciNet  MATH  Google Scholar 

  14. Lazarsfeld, R.: Positivity in algebraic geometry I Classical setting: line bundles and linear series, Ergebnisse der Mathematik und ihrer Grenzgebiete. 3. Folge. A Series of Modern Surveys in Mathematics, vol. 48. Springer, Berlin (2004)

    Book  Google Scholar 

  15. Oguiso, K.: Seshadri constants in a family of surfaces. Math. Ann. 323(4), 625–631 (2002)

    Article  MathSciNet  MATH  Google Scholar 

  16. Roé, J.: A relation between one-point and multi-point Seshadri constants. J. Algebra 274(2), 643–651 (2004)

    Article  MathSciNet  MATH  Google Scholar 

  17. Roé, J., Ross, J.: An inequality between multipoint Seshadri constants. Geom. Dedicata 140, 175–181 (2009)

    Article  MathSciNet  MATH  Google Scholar 

  18. Syzdek, W., Szemberg, T.: Seshadri fibrations of algebraic surfaces. Math. Nachr. 283(6), 902–908 (2010)

    Article  MathSciNet  MATH  Google Scholar 

  19. Szemberg, T.: Global and Local Positivity of Line Bundles. Habilitation (2001)

  20. Szemberg, T.: Bounds on Seshadri constants on surfaces with Picard number 1. Commun. Algebra 40(7), 2477–2484 (2012)

    Article  MathSciNet  MATH  Google Scholar 

  21. Szemberg, T.: An effective and sharp lower bound on Seshadri constants on surfaces with Picard number 1. J. Algebra 319(8), 3112–3119 (2008)

    Article  MathSciNet  MATH  Google Scholar 

  22. Xu, G.: Curves in \({\mathbb{P}}^2\) and symplectic packings. Math. Ann. 299, 609–613 (1994)

    Article  MathSciNet  MATH  Google Scholar 

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Acknowledgments

We sincerely thank Brian Harbourne and Tomasz Szemberg for carefully reading this paper and making many useful suggestions. We also thank the referee for making numerous corrections and suggestions that improved the paper.

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Correspondence to Krishna Hanumanthu.

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Author was partially supported by a grant from Infosys Foundation.

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Hanumanthu, K. Seshadri constants on surfaces with Picard number 1. manuscripta math. 153, 535–543 (2017). https://doi.org/10.1007/s00229-016-0893-4

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  • DOI: https://doi.org/10.1007/s00229-016-0893-4

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