English

On the Zeta functions of supersingular isogeny graphs and modular curves

Number Theory 2023-10-24 v2 Combinatorics

Abstract

Let pp and qq be distinct prime numbers, with q1(mod12)q\equiv 1\pmod{12}. Let NN be a positive integer that is coprime to pqpq. We prove a formula relating the Hasse--Weil zeta function of the modular curve X0(qN)FqX_0(qN)_{\mathbb{F}_q} to the Ihara zeta function of the pp-isogeny graphs of supersingular elliptic curves defined over Fq\overline{\mathbb{F}_q} equipped with a Γ0(N)\Gamma_0(N)-level structure. When N=1N=1, this recovers a result of Sugiyama.

Keywords

Cite

@article{arxiv.2307.01001,
  title  = {On the Zeta functions of supersingular isogeny graphs and modular curves},
  author = {Antonio Lei and Katharina Müller},
  journal= {arXiv preprint arXiv:2307.01001},
  year   = {2023}
}

Comments

minor changes, accepted for publication in Archiv der Mathematik