Asymptotic syzygies of algebraic varieties

Details Asymptotic syzygies of algebraic varieties Asymptotic syzygies of algebraic varieties

2011-03-02

arxiv.org/abs/1103.0483v3

Mathematics

Algebraic Geometry

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

Scientific paper

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.

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