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A bound on the primes of bad reduction for CM curves of genus \(3\). (English) Zbl 07204745
Summary: We give bounds on the primes of geometric bad reduction for curves of genus \(3\) of primitive complex multiplication (CM) type in terms of the CM orders. In the case of elliptic curves, there are no primes of geometric bad reduction because CM elliptic curves are CM abelian varieties, which have potential good reduction everywhere. However, for genus at least \(2\), the curve can have bad reduction at a prime although the Jacobian has good reduction. Goren and Lauter gave the first bound in the case of genus \(2\).
In the cases of hyperelliptic and Picard curves, our results imply bounds on primes appearing in the denominators of invariants and class polynomials, which are important for algorithmic construction of curves with given characteristic polynomials over finite fields.
11G10 Abelian varieties of dimension \(> 1\)
11G15 Complex multiplication and moduli of abelian varieties
14H45 Special algebraic curves and curves of low genus
14K22 Complex multiplication and abelian varieties
14J15 Moduli, classification: analytic theory; relations with modular forms
14Q05 Computational aspects of algebraic curves
genus3; RECIP
Full Text: DOI
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