On a Galois cover of the Hermitian curve of genus $\mathfrak{g}=\frac{1}{8}(q-1)^2$

TL;DR

This paper investigates a specific Galois cover of the Hermitian curve over finite fields, focusing on properties like Frobenius embedding, Weierstrass semigroups, and automorphism groups for a particular genus.

Contribution

It provides new insights into the structure and properties of a Galois cover of the Hermitian curve with genus (q-1)^2/8, especially for q ≡ 1 mod 4.

Findings

Analysis of Frobenius embedding for the curve

Determination of Weierstrass semigroups

Description of automorphism groups

Abstract

In the study of algebraic curves with many points over a finite field, a well known general problem is to understanding better the properties of $\mathbb{F}_{q^2}$-maximal curves whose genera fall in the higher part of the spectrum of the genera of all $\mathbb{F}_{q^2}$-maximal curves. This problem is still open for genera smaller than $ \lfloor \frac{1}{6}(q^2-q+4) \rfloor$. In this paper we consider the case of $\mathfrak{g}=\frac{1}{8}(q-1)^2$ where $q\equiv 1\pmod{4}$ and the curve is the Galois cover of the Hermitian curve w.r.t to a cyclic automorphism group of order $4$. Our contributions concern Frobenius embedding, Weierstrass semigroups and automorphism groups.