Superspecial plane quintics with large automorphism groups
math.AGmath.NT2026-05v1license
Abstract
In this paper, we study plane quintic curves whose automorphism groups have order greater than 10, as well as those with cyclic automorphism groups of order 8 and 10. The latter two cases are represented as one-parameter families, where their superspeciality can be explicitly described in terms of a truncation of certain Gaussian hypergeometric series. Applying this characterization, we determine the exact number of isomorphism classes of superspecial plane quintic curves with automorphism groups . We also provide an efficient algorithm to enumerate such curves with automorphism groups , and provide the computational results for the range .
Comments: 15 pages, comments welcome!
Cite
@article{arxiv.2605.29624,
title = {Superspecial plane quintics with large automorphism groups},
author = {Ryo Ohashi},
journal= {arXiv preprint arXiv:2605.29624},
year = {2026}
}