English

$\ell$-away ACM line bundles on a nonsingular cubic surface

Algebraic Geometry 2024-08-09 v1

Abstract

Let XP3X \subset \mathbb P^3 be a nonsingular cubic hypersurface. Faenzi (\cite{F}) and later Pons-Llopis and Tonini (\cite{PLT}) have completely characterized ACM line bundles over XX. As a natural continuation of their study in the non-ACM direction, in this paper, we completely classify \ell-away ACM line bundles (introduced recently by Gawron and Genc (\cite{GG})) over XX, when 2\ell \leq 2. For 3\ell\geq 3, we give examples of \ell-away ACM line bundles on XX and for each 1\ell \geq 1, we establish the existence of smooth hypersurfaces X(d)X^{(d)} of degree d>d >\ell in P3\mathbb P^3 admitting \ell-away ACM line bundles.

Keywords

Cite

@article{arxiv.2408.04464,
  title  = {$\ell$-away ACM line bundles on a nonsingular cubic surface},
  author = {Debojyoti Bhattacharya and A. J. Parameswaran and Jagadish Pine},
  journal= {arXiv preprint arXiv:2408.04464},
  year   = {2024}
}

Comments

33 pages. Comments are welcome

R2 v1 2026-06-28T18:07:43.125Z