Manuscripta Mathematica

, Volume 135, Issue 1, pp 215–228

On the Seshadri constants of adjoint line bundles

Open AccessArticle

DOI: 10.1007/s00229-010-0418-5

Cite this article as:
Bauer, T. & Szemberg, T. manuscripta math. (2011) 135: 215. doi:10.1007/s00229-010-0418-5

Abstract

In the present paper we study the possible values of Seshadri constants. While in general every positive rational number appears as the local Seshadri constant of some ample line bundle, we point out that for adjoint line bundles there are explicit lower bounds depending only on the dimension of the underlying variety. In the surface case, where the optimal lower bound is 1/2, we characterize all possible values in the range between 1/2 and 1—there are surprisingly few. As expected, one obtains even more restrictive results for the Seshadri constants of adjoints of very ample line bundles. Finally, we study Seshadri constants of adjoint line bundles in the multi-point setting.

Mathematics Subject Classification (2000)

14C20
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© The Author(s) 2010

Authors and Affiliations

  1. 1.Fachbereich Mathematik und InformatikPhilipps-Universität MarburgMarburgGermany
  2. 2.Instytut Matematyki UPKrakówPoland
  3. 3.Albert-Ludwigs-Universität FreiburgMathematisches InstitutFreiburgGermany