Superelliptic curves with minimal weighted moduli height

preprint2021arXivOpen access

Abstract

For a superelliptic curve X\mathcal X, defined over Q\mathbb Q, let p\mathfrak p denote the corresponding moduli point in the weighted moduli space. We describe a method how to determine a minimal integral model of X\mathcal X such that: i) the corresponding moduli point p\mathfrak p has minimal weighted height, ii) the equation of the curve has minimal coefficients. Part i) is accomplished by reduction of the moduli point which is equivalent with obtaining a representation of the moduli point p\mathfrak p with minimal weighted height, as defined in [5], and part ii) by the classical reduction of the binary forms.

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