English

Asymptotic syzygies of algebraic varieties

Algebraic Geometry 2015-05-27 v3 Commutative Algebra

Abstract

This paper studies the asymptotic behavior of the syzygies of a smooth projective variety X as the positivity of the embedding line bundle grows. We prove that as least as far as grading is concerned, the minimal resolution of the ideal of X has a surprisingly uniform asymptotic shape: roughly speaking, generators eventually appear in almost all degrees permitted by Castelnuovo-Mumford regularity. This suggests in particular that a widely-accepted intuition derived from the case of curves -- namely that syzygies become simpler as the degree of the embedding increases -- may have been misleading. For Veronese embeddings of projective space, we give an effective statement that in some cases is optimal, and conjecturally always is so. Finally, we propose a number of questions and open problems concerning asymptotic syzygies of higher-dimensional varieties.

Keywords

Cite

@article{arxiv.1103.0483,
  title  = {Asymptotic syzygies of algebraic varieties},
  author = {Lawrence Ein and Robert Lazarsfeld},
  journal= {arXiv preprint arXiv:1103.0483},
  year   = {2015}
}

Comments

Sections renumbered to conform to published version. To appear in Invent. Math