English

Enumerativity of virtual Tevelev degrees

Algebraic Geometry 2023-03-08 v3

Abstract

Tevelev degrees in Gromov-Witten theory are defined whenever there are virtually a finite number of genus gg maps of fixed complex structure in a given curve class β\beta through nn general points of a target variety XX. These virtual Tevelev degrees often have much simpler structure than general Gromov-Witten invariants. We explore here the question of the enumerativity of such counts in the asymptotic range for large curve class β\beta. A simple speculation is that for all Fano XX, the virtual Tevelev degrees are enumerative for sufficiently large β\beta. We prove the claim for all homogeneous varieties and all hypersurfaces of sufficiently low degree (compared to dimension). As an application, we prove a new result on the existence of very free curves of low degree on hypersurfaces in positive characteristic.

Keywords

Cite

@article{arxiv.2110.05520,
  title  = {Enumerativity of virtual Tevelev degrees},
  author = {Carl Lian and Rahul Pandharipande},
  journal= {arXiv preprint arXiv:2110.05520},
  year   = {2023}
}

Comments

final version, erroneous example removed, reference to forthcoming work of Beheshti-Lehmann-Riedl-Starr-Tanimoto added. To appear in Ann. Sc. Norm. Super. Pisa Cl. Sci

R2 v1 2026-06-24T06:48:18.163Z