English

Ovoids of $Q^+(7,q)$ of low-degree

Combinatorics 2025-02-05 v1 Algebraic Geometry

Abstract

Ovoids of the hyperbolic quadric Q+(7,q)Q^+(7,q) of PG(7,q)\mathrm{PG}(7,q) have been extensively studied over the past 40 years, partly due to their connections with other combinatorial objects. It is well known that the points of an ovoid of Q+(7,q)Q^+(7,q) can be parametrized by three polynomials f1(X,Y,Z)f_1(X,Y,Z), f2(X,Y,Z)f_2(X,Y,Z), f3(X,Y,Z)f_3(X,Y,Z). In this paper, we classify ovoids of Q+(7,q)Q^+(7,q) of low degree, specifically under the assumption that f1(X,Y,Z)f_1(X,Y,Z), f2(X,Y,Z)f_2(X,Y,Z), f3(X,Y,Z)f_3(X,Y,Z) have degree at most 3. Our approach relies on the analysis of an algebraic hypersurface associated with the ovoid.

Keywords

Cite

@article{arxiv.2502.02219,
  title  = {Ovoids of $Q^+(7,q)$ of low-degree},
  author = {Daniele Bartoli and Nicola Durante and Giovanni Giuseppe Grimaldi and Marco Timpanella},
  journal= {arXiv preprint arXiv:2502.02219},
  year   = {2025}
}