The Lang-Trotter conjecture on average for genus-$2$ curves with Klein-$4$ reduced automorphism group

Abstract

For an elliptic curve $E$ over $\mathbb{Q}$ without complex multiplication, Lang and Trotter conjecture \[ \# \{ p 0$ is a constant depending only on $E$. Fourvy and Murty obtained an average estimation related to the Lang-Trotter conjecture, called the Lang-Trotter conjecture on average. We considered the Lang-Trotter conjecture for curves of genus 2, and obtained a similar result to the Lang-Trotter conjecture on average for the family of curves $C_λ:y^2=x(x-1)(x+1)(x-λ)(x-1/ λ)$. Such curves are characterized as curves of genus two with reduced automorphism group containing the Klein $4$-group.