English

New upper bounds for spherical codes and packings

Metric Geometry 2023-10-10 v5 Information Theory math.IT Number Theory

Abstract

We improve the previously best known upper bounds on the sizes of θ\theta-spherical codes for every θ<θ62.997\theta<\theta^*\approx 62.997^{\circ} at least by a factor of 0.43250.4325, in sufficiently high dimensions. Furthermore, for sphere packing densities in dimensions n2000n\geq 2000 we have an improvement at least by a factor of 0.4325+51n0.4325+\frac{51}{n}. Our method also breaks many non-numerical sphere packing density bounds in smaller dimensions. This is the first such improvement for each dimension since the work of Kabatyanskii and Levenshtein~\cite{KL} and its later improvement by Levenshtein~\cite{Leven79}. Novelties of this paper include the analysis of triple correlations, usage of the concentration of mass in high dimensions, and the study of the spacings between the roots of Jacobi polynomials.

Keywords

Cite

@article{arxiv.2001.00185,
  title  = {New upper bounds for spherical codes and packings},
  author = {Naser T. Sardari and Masoud Zargar},
  journal= {arXiv preprint arXiv:2001.00185},
  year   = {2023}
}

Comments

Accepted by Math Annalen. Exposition improved, pictures added. Results unchanged

R2 v1 2026-06-23T13:00:43.418Z