English

Curves with stable or semistable normal bundle on Fano hypersurfaces

Algebraic Geometry 2025-05-02 v7

Abstract

For every n3,g1n\geq 3, g\geq 1 and all large enough ee depending on n,gn,g, there exist curves of genus gg, degree ee in a general hypersurface of degree nn in Pn\mathbb P^n, or in Pn\mathbb P^n itself, whose whose normal bundle NN is stable, as is any sufficiently general full-rank subsheaf of NN. For g=1g=1, NN is semi-stable. On general hypersurface of degree d<nd< n in Pn\mathbb P^n, such that a certain arithmetical condition on d,n,gd,n, g holds, there exists an arithmetical progression of ee values so that curves of degree ee and genus gg with semistable normal bundle exist. Previous results were restricted to certain cases with ambient space n\P^n

Keywords

Cite

@article{arxiv.2211.12661,
  title  = {Curves with stable or semistable normal bundle on Fano hypersurfaces},
  author = {Ziv Ran},
  journal= {arXiv preprint arXiv:2211.12661},
  year   = {2025}
}

Comments

arXiv admin note: text overlap with arXiv:2209.05410 The section on curves on hypersurfaces is new; later version added result on lower-degree hypersurfaces; current version adds results on curve with stable, rather than semistable, normal bundle

R2 v1 2026-06-28T06:38:35.956Z