Quotient curves of the GK curve

Details Quotient curves of the GK curve Quotient curves of the GK curve

2009-09-14

arxiv.org/abs/0909.2582v1

Mathematics

Algebraic Geometry

Scientific paper

For every $q=l^3$ with $l$ a prime power greater than 2, the GK curve $X$ is an $F_{q^2}$-maximal curve that is not $F_{q^2}$-covered by any $F_{q^2}$-maximal Deligne-Lusztig curve. Interestingly, $X$ has a very large $F_{q^2}$-automorphism group with respect to its genus. In this paper we compute the genera of a large variety of curves that are Galois-covered by the GK curve, thus providing several new values in the spectrum of genera of $F_{q^2}$-maximal curves.

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